JP5693197B2 - Solar heat utilization system and control method of solar heat utilization system - Google Patents

Description

  The present invention relates to a solar heat utilization system that collects and uses solar heat and a control method for the solar heat utilization system.

From the viewpoints of depletion of fossil fuels and global warming due to greenhouse gas emissions, there is a need for a system that effectively uses sunlight.
As a system using sunlight, in addition to a photovoltaic power generation system using a photoelectric element that converts light energy into electrical energy by the photoelectric effect, sunlight is collected by a mirror, and the collected sunlight is converted into thermal energy. A solar heat utilization system that collects heat as a solar heat and uses the collected heat medium as a heat source for turbine power generation or the like is known.

  As a solar heat utilization system, Patent Document 1 discloses a solar heat collector (solar heat collector) that collects solar heat energy and supplies the collected solar heat energy to a heat medium, and heat collection by the solar heat collector. The first heat exchanger that exchanges heat between the heat medium that has become hot due to the heat supply and the water that is transferred from the water supply tank, and the water that has become hot due to heat exchange in the first heat exchanger A solar heat generation steam generation system (solar heat utilization system) including a second heat exchanger that performs heat exchange with a working medium and heats feed water with the working medium to generate steam for a process is disclosed. . The generated process steam is used, for example, to generate power by driving a steam turbine.

  Patent Document 2 discloses that solar heat can be directly used for heating and concentration of the absorption liquid, so that it can be operated without the need for a heat source for heating a regenerator such as a burner, and changes depending on weather conditions and the like. In order to achieve a stable air conditioning effect and to reduce the size of the equipment by automatically detecting the heating condition of the absorbing liquid due to the solar heat and automatically operating the auxiliary regenerator, the solar heat collector that directly introduces and heats the diluted absorbing liquid An absorptive air-conditioning apparatus having a heat pipe (solar heat collector) and a flushing regenerator that concentrates by flushing an absorption liquid heated by the solar heat collection pipe is disclosed. In addition, the cold water cooled with the evaporator of the absorption-type air conditioning apparatus is supplied to the air conditioner.

JP-A 63-183346 JP 2001-82823 A

  By the way, the amount of heat collected from the solar heat collector is the amount of heat required from the load (the amount of heat required by the steam turbine in Patent Document 1, the regenerator corresponding to the cooling load required by the air conditioner in Patent Document 2). If the amount of heat is greater than the amount of heat collected, the conventional solar heat utilization system cannot use the surplus (the difference between the amount of heat collected and the amount of heat required from the load) of the amount of heat collected by the solar heat collector. It was.

  Then, this invention makes it a subject to provide the control method of a solar-heat utilization system and solar-heat utilization system which can utilize the collected solar heat efficiently.

In order to solve such a problem, the present invention provides a solar heat collector that collects solar heat and heats the first heat medium in the solar heat utilization system that uses the collected solar heat, and the heated first heat medium. A storage container for storing a heat medium, and a latent heat storage agent container in which a latent heat storage agent is enclosed is disposed in an internal space of the storage container, and the storage container is configured to receive the first heat collector from the solar heat collector. 1 It is a heat storage tank installed in the downstream of the gas-liquid separator which isolate | separates a heat medium into a vapor | steam and a liquid, It is characterized by the above-mentioned.

  The present invention also includes a solar heat collector that collects solar heat and heats the heat medium, a gas-liquid separator that separates the heated heat medium into steam and liquid, and a latent heat storage agent enclosed in the internal space. A heat storage tank in which the latent heat storage agent container is disposed, a first pressure regulating valve provided in a pipe that distributes the steam from the gas-liquid separator to a supply apparatus to which steam at a first pressure is supplied, A second pressure regulating valve provided in a pipe that circulates steam from the gas-liquid separator to the heat storage tank; and a third pressure regulating valve provided in a pipe that circulates steam from the heat storage tank to the supply target device. A first pressure detector for detecting the internal pressure of the gas-liquid separator, a second pressure detector for detecting the internal pressure of the heat storage tank, and a third pressure for detecting the pressure of the steam supplied to the supply target device. A detector, the first pressure detector, the second pressure detector, and Control of a solar heat utilization system comprising: a control device that controls the opening of the first pressure regulating valve, the second pressure regulating valve, and the third pressure regulating valve based on a detection result of the third pressure detector. The method may be configured such that when the detection value of the first pressure detector is higher than the first pressure, the control device is configured to cause the detection value of the third pressure detector to approach the first pressure. When the opening of the regulating valve is controlled and the detection value of the first pressure detector is higher than a predetermined second pressure higher than the first pressure, the detection value of the third pressure detector becomes the first pressure. The opening of the first pressure regulating valve is controlled so as to approach, the opening of the second pressure regulating valve is controlled so that the detection value of the first pressure detector approaches the second pressure, and the first The detection value of one pressure detector is lower than the first pressure, and the second pressure When the detected value of the discharger is higher than the first pressure, the opening of the third pressure regulating valve is controlled so that the detected value of the third pressure detector approaches the first pressure. .

  ADVANTAGE OF THE INVENTION According to this invention, the solar-heat utilization system which can utilize the collected solar heat efficiently, and the control method of a solar-heat utilization system can be provided.

1 is a schematic configuration diagram of a solar heat utilization system according to a first embodiment. It is a structure schematic diagram of the front | former part of the solar-heat utilization system which concerns on 2nd Embodiment. It is the table | surface which showed the relationship between the determination pressure conditions and control of a pressure regulation valve in each operation mode of the solar-heat utilization system which concerns on 2nd Embodiment. It is the figure which showed the relationship between the change of the operation mode of the day in the solar heat utilization system which concerns on 2nd Embodiment, and a pressure.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

≪Solar heat utilization system according to the first embodiment≫
FIG. 1 is a schematic configuration diagram of a solar heat utilization system S according to the first embodiment.
The solar heat utilization system S includes a solar heat collector 1, a gas-liquid separator 2, a boiler 4, absorption chillers 31, 32, 33, a cold water tank 50, a load 70, a control device 80, and the like.
In the following description, the front stage of the solar heat utilization system S is a part for supplying steam (heat medium steam) to the absorption chillers 31, 32, 33 (that is, the outgoing pipe from the solar heat collector 1 shown in FIG. 1). 501 / return piping 502), and the latter part of the solar heat utilization system S indicates a part from the absorption refrigerators 31, 32, 33 to the load 70. In addition, the control apparatus 80 controls the whole solar heat utilization system S (a front | former stage and a back | latter stage).

<Solar heat utilization system first stage>
It demonstrates from the front | former stage of the solar-heat utilization system S which concerns on 1st Embodiment.
The solar heat utilization system S shown in FIG. 1 supplies steam (heat medium steam) from the gas-liquid separator 2 (solar heat collector 1) or the boiler 4 to the absorption chillers 31, 32, and 33.

(Vapor supply from gas-liquid separator)
First, a case where steam (heat medium steam) is supplied from the gas-liquid separator 2 (solar heat collector 1) to the absorption chillers 31, 32, 33 will be described. In this case, the on-off valve 241 and the pressure adjustment valve 242 are closed, and the on-off valve 251, the pressure-holding valve 252 and the pressure adjustment valve 260 are opened. That is, the boiler 4 is in a stopped state (standby state).

  The solar heat collector 1 includes a reflection panel (not shown) that collects sunlight and a heat collection tube (not shown) that collects heat by the collected sunlight. Moreover, you may provide the moving mechanism (not shown) which moves a reflective panel toward the irradiation direction of sunlight, and the control apparatus (not shown) of a moving mechanism.

Here, as shown in FIG. 1, the water (heat medium) supplied from the return pipe 502 is fed by the heat medium pump 5 and supplied to the inlet side of the solar heat collector 1. Note that the rotation speed (flow rate) of the heat medium pump 5 is controlled by the control device 80 via the inverter 105.
Further, a pipe connected to the inlet side of the solar heat collector 1 includes a flow rate sensor 221 that detects a flow rate of water (heat medium) supplied to the inlet side of the solar heat collector 1, and the solar heat collector 1. And a temperature sensor 202 for detecting the temperature of the water (heat medium) supplied to the inlet side of the. Detection signals from the temperature sensor 202 and the flow sensor 221 are transmitted to the control device 80.

Water (heat medium) supplied from the inlet side of the solar heat collector 1 flows into the heat collection tube. Here, the heat collecting tube of the solar heat collector 1 is heat-collected (heated) by sunlight condensed by the reflection panel of the solar heat collector 1. As a result, heat is exchanged between the collected heat collecting tube and the water (heat medium) flowing in the heat collection tube, whereby the water (heat medium) is heated and partially vaporized, and high-temperature water (heat medium) ) And steam (heat medium steam).
The gas-liquid mixed fluid generated by the solar heat collector 1 flows into the gas-liquid separator 2 from the outlet side of the solar heat collector 1. A pressure holding valve 252 is provided on the pipe connected to the gas-liquid separator 2 from the outlet side of the solar heat collector 1 so that the pressure in the solar heat collector 1 (in the heat collection tube) does not become a predetermined value or less. It is controlled.

The gas-liquid separator 2 separates the gas-liquid mixed fluid flowing from the solar heat collector 1 into a gas component (heat medium vapor) and a liquid component (high-temperature water).
The separated gas component (heat medium vapor) is supplied to the absorption refrigerators 31, 32, and 33 (after the solar heat utilization system S) via the forward pipe 501.

The forward piping 501 is provided with a pressure adjustment valve 260. Note that the opening of the pressure regulating valve 260 is configured to be controllable by the control device 80.
Further, on the downstream side of the pressure regulating valve 260, a temperature sensor 201 that detects the temperature of the heat medium vapor supplied to the absorption chillers 31, 32, 33 (after the solar heat utilization system S), and the absorption chiller 31. , 32, 33 (the latter stage of the solar heat utilization system S) and a pressure sensor 233 for detecting the pressure of the heat medium vapor supplied. Detection signals from the temperature sensor 201 and the pressure sensor 233 are transmitted to the control device 80.
Based on the detection value of the pressure sensor 233, the control device 80 determines that the pressure of the heat medium vapor supplied from the gas-liquid separator 2 to the absorption chillers 31, 32, 33 is a predetermined pressure (for example, 0.8 MPaG (gauge The opening degree of the pressure regulating valve 260 is controlled so as to satisfy the pressure)).

The gas-liquid separator 2 includes a pressure sensor 231 that detects a pressure in the gas-liquid separator 2 and a liquid level sensor 281 that detects a liquid level (level) of high-temperature water (heat medium) in the gas-liquid separator 2. And are provided. Detection signals from the pressure sensor 231 and the liquid level sensor 281 are transmitted to the control device 80.
In addition, the gas-liquid separator 2 is provided with a pump 3 that sends the high-temperature water (heat medium) in the gas-liquid separator 2 to the inlet side of the solar heat collector 1. The rotation speed (flow rate) of the pump 3 is controlled by the control device 80 via the inverter 103.
The control device 80 controls the rotation speed of the pump 3 based on the detection value of the liquid level sensor 281 so that the liquid level of the high-temperature water (heat medium) in the gas-liquid separator 2 becomes a predetermined liquid level. .
In addition, the control device 80 monitors the internal pressure of the gas-liquid separator 2 using the detection value of the pressure sensor 231.

Here, the connection part on the gas-liquid separator 2 side of the pipe into which the gas-liquid mixed fluid flows from the outlet side of the solar heat collector 1 is provided below the liquid level in the gas-liquid separator 2.
With such a configuration, the heat medium vapor flowing from the solar heat collector 1 is sent to the absorption chillers 31, 32, 33 after heating the high-temperature water (heat medium) in the gas-liquid separator 2. It has become.

  A latent heat storage agent container 8 in which a latent heat storage agent is enclosed is disposed in the internal space of the gas-liquid separator 2. Here, the liquid level in the gas-liquid separator 2 is kept constant, and the latent heat storage agent container 8 is disposed so as to be submerged. Note that the latent heat storage agent container 8 in which the latent heat storage agent is enclosed includes a bag. Moreover, the area | region divided by the partition may be provided in the gas-liquid separator 2, and a latent heat storage agent may be enclosed with the area | region.

Here, the latent heat storage agent sealed in the latent heat storage agent container 8 is based on the pressure of the heat medium vapor supplied to the absorption refrigerators 31, 32, 33, that is, the pressure controlled by the pressure adjustment valve 260. It is determined.
When the pressure of the heat medium vapor supplied to the absorption chillers 31, 32, 33 is 0.8 MPaG, the saturation temperature corresponding to 0.8 MPaG is about 175 ° C., and the latent heat storage agent has this saturation temperature (about 175 C.) a substance with a higher melting point is used. As the latent heat storage agent, for example, pentaerythritol (melting point 187 ° C.) or dulcitol (melting point 187 ° C.) can be used.

The heat storage and heat release of the latent heat storage agent enclosed in the latent heat storage agent container 8 will be described.
When solar heat is abundant, that is, when the amount of heat collected by the solar heat collector 1 increases, the ratio of the heat medium vapor in the gas-liquid mixed fluid flowing from the solar heat collector 1 into the gas-liquid separator 2 increases. However, since the pressure of the heat medium vapor supplied to the absorption refrigerators 31, 32, and 33 is limited (0.8 MPaG) by the pressure regulating valve 260, the pressure in the gas-liquid separator 2 increases, The temperature in the liquid separator 2 also rises.
When the temperature in the gas-liquid separator 2 (particularly the temperature of the high-temperature water in the gas-liquid separator 2) becomes higher than the melting point of the latent heat storage agent, the latent heat storage agent melts. Thus, a part of the amount of heat collected by the solar heat collector 1 can be stored as latent heat by melting the latent heat storage agent. Thereby, the raise (increase in temperature) of the internal pressure of the gas-liquid separator 2 is suppressed.

Thereafter, when the solar heat is reduced or interrupted, that is, the amount of heat collected by the solar heat collector 1 is reduced, and only with the heat medium steam flowing from the solar heat collector 1 into the gas-liquid separator 2, the absorption chillers 31, The case where the pressure of the heat medium vapor supplied to the 32 and 33 cannot be covered (for example, in the case of cloudy or sunset) will be described.
In such a case, the temperature (pressure) inside the gas-liquid separator 2 starts to decrease, but the molten latent heat storage agent (heat storage latent heat storage agent) starts to solidify due to the decrease in temperature. This can release latent heat and generate steam.
Here, since the melting point of the latent heat storage agent is higher than the saturation temperature (about 175 ° C.) corresponding to the pressure (0.8 MPaG) limited by the pressure regulating valve 260, the heat medium vapor in the gas-liquid separator 2 is It becomes higher than the pressure limited by the pressure regulating valve 260. That is, the heat medium vapor can be supplied from the gas-liquid separator 2 to the absorption refrigerators 31, 32, 33.

(Steam supply from boiler)
Next, a case where steam (heat medium steam) is supplied from the boiler 4 to the absorption refrigerators 31, 32, 33 will be described.
The boiler 4 is a device that generates steam by burning fossil fuel or the like.
If the downstream side of the pressure adjustment valve 260 does not reach a predetermined pressure (for example, 0.8 MPaG) even when the opening of the pressure adjustment valve 260 is fully opened, the control device 80 opens the on-off valve 251, the pressure holding valve 252, and the pressure adjustment valve 260. The valve is closed, the on-off valve 241 and the pressure regulating valve 242 are opened, and the boiler 4 is activated to generate steam. And the control apparatus 80 controls the opening degree of the pressure control valve 242 so that the detection value of the pressure sensor 233 may become predetermined | prescribed pressure (for example, 0.8 MPaG). Moreover, the output (thermal power) of the boiler 4 is adjusted.

<Second stage of solar heat utilization system>
The latter part of the solar heat utilization system S according to the first embodiment will be described.
The cooling tower 10 is a device that generates cooling water to be supplied to the absorption chillers 31, 32, and 33. The cooling tower 10 exhausts the heat of the cooling water absorbed by the absorption chillers 31, 32, and 33 into the atmosphere. A heat mechanism (not shown) and a fan (not shown) for promoting exhaust heat are provided. Note that the rotation speed of the fan of the cooling tower 10 is controlled by the control device 80 via the inverter 110.
The cooling water generated in the cooling tower 10 is supplied to the absorption chillers 31, 32, 33 by the cooling water pumps 21, 22, 23, and between the cooling tower 10 and the absorption chillers 31, 32, 33. Cooling water circulates. Note that the rotation speeds of the cooling water pumps 21, 22, and 23 are controlled by the control device 80 via the inverters 121, 122, and 123.

  The absorption refrigerators 31, 32, and 33 are chilled water tanks using steam (heat medium steam) supplied from the gas-liquid separator 2 (or boiler 4) and cooling water supplied from the cooling tower 10. 50 is a device for cooling water (cold water) supplied from 50, a regenerator (not shown), a condenser (not shown), an evaporator (not shown), and an absorber (not shown). And.

  The absorption chillers 31, 32, and 33 are double-effect absorption chillers, and have a high temperature (for example, 175 ° C.) supplied from the gas-liquid separator 2 (or the boiler 4) via the forward piping 501. Using the vapor (heat medium vapor), the absorption liquid (for example, lithium bromide aqueous solution) is heated in the regenerator (for example, heated at 150 ° C.), and further, the absorption liquid before being introduced into the regenerator is heated ( Preheat) (for example, heating at 80 ° C.). The heat medium liquefied by heating the absorbing liquid is supplied to the solar heat collector 1 (or the boiler 4) by the heat medium pump 5 through the return pipe 502.

An outline of the flow of absorption liquid and refrigerant in the absorption chillers 31, 32, and 33 will be described.
The absorption liquid heated in the regenerator is separated into refrigerant vapor and concentrated absorption liquid. The refrigerant vapor is introduced from the regenerator into the condenser, and the concentrated absorption liquid is introduced from the regenerator into the absorber.
The refrigerant vapor introduced into the condenser is cooled and condensed with the cooling water supplied from the cooling tower 10 to form water (refrigerant), and the water (refrigerant) is introduced into the evaporator.
The inside of the evaporator has a low pressure (for example, 0.01 MPa (abs)), and water evaporates even at a low temperature (for example, about 5 ° C.). Water (refrigerant) introduced into the evaporator takes heat from water (cold water) supplied from a cold water tank 50 described later and evaporates. The evaporated refrigerant is absorbed by the absorber in the concentrated absorbent introduced from the regenerator. Then, the absorbing liquid is introduced into the regenerator.

The cold water tank 50 is a water tank in which cold water supplied to the load 70 is stored.
Water (cold water) in the cold water tank 50 is pumped up by the cold water primary pumps 41, 42, 43, supplied to the absorption chillers 31, 32, 33, and by the heat of evaporation due to evaporation of water (refrigerant) in the evaporator. It is cooled to become cold water and returns to the cold water tank 50. The rotation speed of the cold water primary pumps 41, 42, 43 is controlled by the control device 80 via the inverters 141, 142, 143.

The water (cold water) in the cold water tank 50 is pumped up by the cold water secondary pump 60, supplied to the load 70, heated by the load 70 (heat absorption), and returned to the cold water tank 50. The rotational speed of the cold water secondary pump 60 is controlled by the control device 80 via the inverter 160.
A pipe connected from the cold water tank 50 to the inlet side of the load 70 is provided with a temperature sensor 203 that detects the temperature of water (cold water) supplied to the load 70. In addition, a pipe connected to the cold water tank 50 from the outlet side of the load 70 includes a temperature sensor 204 that detects the temperature of water discharged from the load 70 (heat absorbed cold water), and cold water flowing into (flowing out) the load 70. And a flow rate sensor 222 for detecting the flow rate of the. Detection signals from the temperature sensor 203, the temperature sensor 204, and the flow sensor 222 are transmitted to the control device 80.

  The solar heat utilization system S includes a temperature sensor 205 that detects the temperature of the outside air and a humidity sensor 211 that detects the humidity of the outside air. Detection signals from the temperature sensor 205 and the humidity sensor 211 are transmitted to the control device 80.

The overall control of the solar heat utilization system S executed by the control device 80 will be described.
The control device 80 calculates the heat collection amount of the solar heat collector 1 based on the detection value of the temperature sensor 201, the detection value of the temperature sensor 202, the detection value of the flow sensor 221, and the detection value of the pressure sensor 233.
Further, the control device 80 calculates the cooling load of the load 70 based on the detection value of the temperature sensor 203, the detection value of the temperature sensor 204, and the detection value of the flow rate sensor 222.
In addition, the control device 80 calculates the wet bulb temperature of the outside air based on the detection value of the temperature sensor 205 and the detection value of the detection value of the humidity sensor 211.

The control device 80 uses the calculated amount of heat collected by the solar heat collector 1, the cooling load of the load 70, and the wet bulb temperature of the outside air to store a control table (not shown) stored in a storage unit (not shown) of the control device 80. (Not shown), the number of operating absorption chillers 31, 32, 33, the rotation speed of the cooling tower 10, the rotation speed of the cooling water pumps 21, 22, 23, and the rotation speed of the heat medium pump 5 are obtained.
The control device 80 controls the operation of the absorption chillers 31, 32, 33, controls the rotational speed of the cooling tower 10 via the inverter 110, and controls the cooling water pump 21 via the inverters 121, 122, 123. , 22, and 23, and the rotation speed of the heat medium pump 5 is controlled via the inverter 105.

The control device 80 controls the rotational speed of the chilled water secondary pump 60 via the inverter 160 so that the difference (temperature difference) between the detection value of the temperature sensor 203 and the detection value of the temperature sensor 204 is constant.
And the control apparatus 80 is the total of the flow volume of the cold water which the cold water primary pump 41,42,43 sends to the absorption refrigerator 31,32,33, and the cold water which the cold water secondary pump 60 sends to the load 70. The rotational speeds of the chilled water primary pumps 41, 42, and 43 are controlled via the inverters 141, 142, and 143 so that the flow rates (that is, the flow rates detected by the flow sensor 222) are equal.

As explained above, according to the solar heat utilization system S according to the first embodiment, when the amount of heat collected by the solar heat collector 1 is larger than the amount of heat of steam supplied to the absorption chillers 31, 32, 33, The latent heat storage agent in the latent heat storage agent container 8 disposed in the liquid separator 2 can be dissolved from solid to liquid and stored as latent heat.
Moreover, even when the amount of heat collected by the solar heat collector 1 is reduced due to sunset (when heat collection is not possible), the latent heat storage agent solidifies from a liquid to a solid, and steam is generated by the latent heat. The absorption refrigerators 31, 32, and 33 can be supplied.
Thereby, the solar-heat utilization system S which can utilize efficiently the solar heat collected with the solar-heat collector 1 can be provided.
Further, even if the amount of heat collected by the solar heat collector 1 is reduced due to a temporary change in the weather, the boiler 4 can be prevented from operating only for a short time, and is robust against a temporary change in the weather. A solar heat utilization system S can be provided.

≪Solar heat utilization system according to the second embodiment≫
Next, a solar heat utilization system S ′ according to the second embodiment will be described with reference to FIG.
The latter part of the solar heat utilization system S ′ according to the second embodiment is the same as the latter part (see FIG. 1) of the solar heat utilization system S according to the first embodiment. In FIG. The illustration and description of the subsequent stage of the solar heat utilization system S ′ are omitted.

  The difference between the solar heat utilization system S (see FIG. 1) according to the first embodiment and the solar heat utilization system S ′ (see FIG. 2) according to the second embodiment is the gas-liquid separator 2 ′ of the second embodiment. Is different in that the latent heat storage agent container 8 is not disposed and the storage tanks 6a and 6b are disposed in which the latent heat storage agent container 8 is disposed.

<Gas-liquid separator>
The gas-liquid separator 2 ′ separates the gas-liquid mixed fluid flowing from the solar heat collector 1 into a gas component (heat medium vapor) and a liquid component (high temperature water). Unlike the gas-liquid separator 2 (see FIG. 1) of the first embodiment, the gas-liquid separator 2 ′ is not provided with the latent heat storage agent container 8. For this reason, the open part (end part) in the gas-liquid separator 2 of the pipe into which the gas-liquid mixed fluid flows from the outlet side of the solar heat collector 1 is provided above the liquid level in the gas-liquid separator 2. ing. In addition, you may provide the pressure-holding valve 252 (refer FIG. 1) in piping which connects the solar-heat collector 1 and gas-liquid separator 2 '.

The gas-liquid separator 2 ′ is provided with a liquid level sensor 281 that detects the liquid level of high-temperature water (heat medium) in the gas-liquid separator 2 ′. The detection signal of the liquid level sensor 281 is transmitted to the control device 80.
In addition, the gas-liquid separator 2 ′ is provided with a pump 3 that sends the high-temperature water (heat medium) in the gas-liquid separator 2 ′ to the inlet side of the solar heat collector 1. The rotation speed (flow rate) of the pump 3 is controlled by the control device 80 via the inverter 103.
The control device 80 controls the rotational speed of the pump 3 based on the detection value of the liquid level sensor 281 so that the liquid level of the high-temperature water (heat medium) in the gas-liquid separator 2 ′ becomes a predetermined liquid level. To do.

Further, a temperature sensor 206 that detects the temperature of the heat medium vapor supplied from the gas-liquid separator 2 ′ and a pressure sensor 231 that detects the pressure in the gas-liquid separator 2 ′ are provided.
The control device 80 calculates the amount of heat collected by the solar heat collector 1 based on the detected value of the temperature sensor 206, the detected value of the temperature sensor 202, the detected value of the flow rate sensor 221, and the detected value of the pressure sensor 231.
The gas component (heat medium vapor) separated by the gas-liquid separator 2 ′ is supplied to the forward piping 501, the heat storage tank 6a, and the heat storage tank 6b.

A pressure regulating valve 261 is disposed in a pipe line connecting the gas-liquid separator 2 ′ and the outgoing pipe 501. Note that the opening of the pressure regulating valve 261 is configured to be controllable by the control device 80.
When supplying the heat medium vapor from the gas-liquid separator 2 ′ to the outgoing pipe 501 (hereinafter referred to as “solar heating operation”), the control device 80 opens the pressure adjustment valve 261 and sets the detected value of the pressure sensor 233. Based on this, the opening degree of the pressure regulating valve 261 is controlled so that the pressure of the heat medium vapor supplied from the gas-liquid separator 2 ′ to the outgoing pipe 501 becomes a predetermined pressure (for example, 0.8 MPaG).

<Heat storage tank>
In the internal space of the heat storage tanks 6a and 6b, a latent heat storage agent container 8 in which a liquid heat medium is stored and a latent heat storage agent is enclosed is disposed. Here, the liquid level in the heat storage tanks 6a and 6b is kept constant as will be described later, and the latent heat storage agent container 8 is disposed so as to be submerged.
In addition, open portions (end portions) in the heat storage tanks 6 a and 6 b of the piping into which the heat medium vapor flows from the gas-liquid separator 2 ′ are provided below the liquid level in the gas-liquid separator 2. With such a configuration, the heat medium vapor flowing from the gas-liquid separator 2 ′ heats the heat medium in the heat storage tanks 6a and 6b.

A pressure regulating valve 263a is disposed in a pipe line connecting the gas-liquid separator 2 ′ and the heat storage tank 6a, and a pressure regulating valve 265a is disposed in a pipe line connecting the heat storage tank 6a and the forward pipe 501. . The pressure adjustment valve 263a and the pressure adjustment valve 265a are configured such that the opening degree thereof can be controlled by the control device 80.
When supplying the heat medium steam from the gas-liquid separator 2 ′ to the heat storage tank 6 a (hereinafter referred to as “6a heat storage operation”), the control device 80 opens the pressure adjustment valve 263 a and detects the value of the pressure sensor 231. Based on the above, the opening degree of the pressure regulating valve 263a is controlled so that the pressure in the gas-liquid separator 2 ′ becomes a predetermined pressure (for example, 1.5 MPaG).
When supplying the heat medium steam from the heat storage tank 6 a to the outgoing pipe 501 (hereinafter referred to as “6a heat radiation operation”), the control device 80 opens the pressure adjustment valve 265 a and based on the detection value of the pressure sensor 233. The opening degree of the pressure regulating valve 265a is controlled so that the pressure of the heat medium vapor supplied from the heat storage tank 6a to the outgoing pipe 501 becomes a predetermined pressure (for example, 0.8 MPaG).

A pressure regulating valve 263b is arranged in a pipe line connecting the gas-liquid separator 2 'and the heat storage tank 6b, and a pressure regulating valve 265b is arranged in a pipe line connecting the heat storage tank 6b and the forward pipe 501. . The pressure adjustment valve 263b and the pressure adjustment valve 265b are configured such that the opening degree thereof can be controlled by the control device 80.
When supplying the heat medium vapor from the gas-liquid separator 2 ′ to the heat storage tank 6 b (hereinafter referred to as “6b heat storage operation”), the control device 80 opens the pressure adjustment valve 263 b and detects the value detected by the pressure sensor 231. Based on the above, the opening degree of the pressure regulating valve 263b is controlled so that the pressure in the gas-liquid separator 2 ′ becomes a predetermined pressure (for example, 1.5 MPaG).
When supplying the heat medium steam from the heat storage tank 6b to the outgoing pipe 501 (hereinafter referred to as “6b heat radiation operation”), the control device 80 opens the pressure adjustment valve 265b and based on the detection value of the pressure sensor 233. The opening degree of the pressure regulating valve 265b is controlled so that the pressure of the heat medium vapor supplied from the heat storage tank 6b to the outgoing pipe 501 becomes a predetermined pressure (for example, 0.8 MPaG).

The heat storage tank 6a is provided with a pressure sensor 232a for detecting the pressure in the heat storage tank 6a and a liquid level sensor 282a for detecting the liquid level of the heat medium in the heat storage tank 6a. Detection signals from the pressure sensor 232a and the liquid level sensor 282a are transmitted to the control device 80.
Further, the heat storage tank 6a is provided with a pump 7a for sending the heat medium in the heat storage tank 6a to the inlet side of the solar heat collector 1 and a liquid level adjusting valve 271a. In addition, a liquid level adjusting valve 272a is disposed in a pipe line connecting the bottom surface of the gas-liquid separator 2 ′ and the bottom surface of the heat storage tank 6a.
The control device 80 controls the liquid level of the heat medium in the heat storage tank 6a to be a predetermined liquid level based on the detection value of the liquid level sensor 282a. Specifically, when the detected value of the liquid level sensor 282a is higher than a predetermined value, the control device 80 opens the liquid level adjusting valve 271a and controls the rotational speed (flow rate) of the pump 7a via the inverter 107a. . On the other hand, when the detected value of the liquid level sensor 282a is lower than the predetermined value, the control device 80 opens the liquid level adjusting valve 272a and supplies high-temperature water (heat medium) from the gas-liquid separator 2 ′ into the heat storage tank 6a. Let it flow.

The heat storage tank 6b is provided with a pressure sensor 232b for detecting the pressure in the heat storage tank 6b and a liquid level sensor 282b for detecting the liquid level of the heat medium in the heat storage tank 6b. Detection signals from the pressure sensor 232b and the liquid level sensor 282b are transmitted to the control device 80.
Further, the heat storage tank 6b is provided with a pump 7b and a liquid level adjusting valve 271b for feeding the heat medium in the heat storage tank 6b to the inlet side of the solar heat collector 1. Further, a liquid level adjusting valve 272b is disposed in a pipe line connecting the bottom surface of the heat storage tank 6a and the bottom surface of the heat storage tank 6b.
The control device 80 controls the liquid level of the heat medium in the heat storage tank 6b to be a predetermined liquid level based on the detection value of the liquid level sensor 282b. Specifically, when the detection value of the liquid level sensor 282b is higher than a predetermined value, the control device 80 opens the liquid level adjustment valve 271b and controls the rotational speed (flow rate) of the pump 7b via the inverter 107b. . On the other hand, when the detected value of the liquid level sensor 282b is lower than the predetermined value, the control device 80 opens the liquid level adjusting valve 272b and allows high temperature water (heat medium) to flow into the heat storage tank 6b from the heat storage tank 6a.

<Boiler>
The solar heat utilization system S ′ includes a boiler 4 as in the solar heat utilization system S according to the first embodiment.
When supplying the heat medium steam from the boiler 4 to the outgoing pipe 501 (hereinafter referred to as “boiler operation”), the control device 80 opens the on-off valve 241 and the pressure regulating valve 242, and based on the detection value of the pressure sensor 233. Thus, the opening degree of the pressure regulating valve 242 is controlled so that the pressure of the heat medium vapor supplied from the boiler 4 to the outgoing pipe 501 becomes a predetermined pressure (for example, 0.8 MPaG). Moreover, the output (thermal power) of the boiler 4 is also adjusted.

<Control in each driving situation>
FIG. 3 is a table showing the relationship between the judgment pressure condition and the control of each pressure regulating valve in each operation mode of the solar heat utilization system S ′ according to the second embodiment.
In the following description, the pressure of the heat medium vapor supplied to the latter stage of the solar heat utilization system S ′ (absorption refrigerators 31, 32, 33, etc. shown in FIG. 1), that is, in the forward piping 501 (see FIG. 2). This is the pressure of the heat medium vapor, and the detection value of the pressure sensor 233 (see FIG. 2) is assumed to be 0.8 MPaG. Moreover, it demonstrates as a thing using dulcitol (melting | fusing point 187 degreeC) as a latent heat storage agent enclosed with the latent heat storage agent container 8. FIG.

When the detected value of the pressure sensor 231 is 0.8 MPaG or more, the heat medium vapor having a predetermined pressure can be supplied from the gas-liquid separator 2 ′ to the outgoing pipe 501.
The control device 80 performs solar thermal operation (see the first example in FIG. 3) for controlling the opening degree of the pressure regulating valve 261 so that the detection value of the pressure sensor 233 becomes 0.8 MPaG.

When the amount of the heat medium vapor supplied from the solar heat collector 1 is larger than the amount of the heat medium vapor supplied to the outgoing pipe 501, the pressure in the gas-liquid separator 2 ′ increases and the detected value of the pressure sensor 231. Becomes larger.
When the detected value of the pressure sensor 231 is 1.5 MPaG or more, the control device 80 performs the heat storage operation in addition to the solar heat operation. In addition, the heat storage operation is performed with priority in the order of 6a heat storage operation for storing heat in the heat storage tank 6a (see the second example in FIG. 3) and 6b heat storage operation for storing heat in the heat storage tank 6b (see the third example in FIG. 3). The

When the detection value of the pressure sensor 231 is 1.5 MPaG or more and the detection value of the pressure sensor 232a of the heat storage tank 6a is less than 1.5 MPaG, the control device 80 detects the pressure sensor 231 in addition to the solar thermal operation. The 6a heat storage operation (see the second example in FIG. 3) for controlling the opening degree of the pressure regulating valve 263a is executed so that the value becomes 1.5 MPaG.
Thereby, a part of the heat medium steam supplied from the solar heat collector 1 is supplied to the heat storage tank 6a, the heat medium (liquid) in the heat storage tank 6a is heated, and the latent heat storage agent in the heat storage tank 6a is heated. It is stored as latent heat by melting (liquefying) from solid to liquid.

When all of the latent heat storage agent in the heat storage tank 6a is melted, the pressure in the heat storage tank 6a rises again. Here, the saturation temperature for 1.5 MPaG is 201 ° C., which is higher than the melting point (187 ° C.) of the latent heat storage agent.
For this reason, when the detected value of the pressure sensor 232a of the heat storage tank 6a is 1.5 MPaG or more, the control device 80 melts (liquefies) all the latent heat storage agent disposed in the internal space of the heat storage tank 6a. It can be determined that the heat storage tank 6a has been fully stored.

When the heat storage tank 6a is fully stored, the 6b heat storage operation (see the third example in FIG. 3) for storing heat in the heat storage tank 6b is then performed.
That is, the detected value of the pressure sensor 231 is 1.5 MPaG or more, the detected value of the pressure sensor 232a of the heat storage tank 6a is 1.5 MPaG or more (the heat storage tank 6a is fully stored), and the pressure sensor of the heat storage tank 6b. When the detected value of 232b is less than 1.5 MPaG, the control device 80 controls the opening degree of the pressure regulating valve 263b so that the detected value of the pressure sensor 231 becomes 1.5 MPaG in addition to the solar thermal operation. Perform heat storage operation.

  When the heat storage tank 6b is also fully stored (that is, the detection value of the pressure sensor 231 is 1.5 MPaG or more, the detection value of the pressure sensor 232a is 1.5 MPaG or more, and the pressure sensor 232b When the detected value is 1.5 MPaG or more), the solar heat utilization system S ′ shown in FIG. 2 cannot store any more heat. From the viewpoint of pressure resistance protection, from the relief valve (not shown) of the gas-liquid separator 2 ′. A part of the heat medium vapor may be discharged.

On the other hand, when the amount of the heat medium vapor supplied from the solar heat collector 1 is smaller than the amount of the heat medium vapor supplied to the outgoing pipe 501, the pressure in the gas-liquid separator 2 ′ decreases and the pressure sensor 231 The detected value becomes smaller.
When the detected value of the pressure sensor 231 is less than 0.8 MPaG, the heat medium vapor having a predetermined pressure cannot be supplied from the gas-liquid separator 2 ′ to the outgoing pipe 501.
For this reason, the heat medium steam having a predetermined pressure is supplied from the heat storage tanks 6 a and 6 b or the boiler 4 to the outgoing pipe 501. In the heat radiation operation, heat is dissipated with priority in the order of the heat storage tank 6b and the heat storage tank 6a, contrary to the order in which heat is preferentially stored in the heat storage operation.

When the detected value of the pressure sensor 231 is 0.8 MPaG or less and the detected value of the pressure sensor 232 b of the heat storage tank 6 b is 0.8 MPaG or more, the control device 80 has a detected value of the pressure sensor 233 of 0. A 6b heat radiation operation (see the fourth example in FIG. 3) for controlling the opening of the pressure regulating valve 265b is executed so as to be 8 MPaG.
Here, the saturation temperature for 0.8 MPaG is 175 ° C., which is lower than the melting point (187 ° C.) of the latent heat storage agent.
Therefore, in the state where the latent heat storage agent in the heat storage tank 6b is solidified (solidified) from a liquid to a solid and the latent heat is released, the pressure in the heat storage tank 6b is kept at a pressure higher than 0.8 MPaG. For this reason, the heat medium vapor | steam of a predetermined | prescribed pressure can be supplied to the going piping 501 from the thermal storage tank 6b.

  Then, by determining whether or not the detected value of the pressure sensor 232b of the heat storage tank 6b is less than 0.8 MPaG, all of the latent heat storage agent disposed in the internal space of the heat storage tank 6b is solidified (solidified). It can be determined whether or not the heat medium vapor cannot be pressurized from the heat storage tank 6b to the outgoing pipe 501 at a predetermined pressure.

When the heat release from the heat storage tank 6b is completed (that is, when the detected value of the pressure sensor 232b is less than 0.8 MPaG), the control device 80 executes the 6a heat release operation (see the fifth example in FIG. 3).
That is, the detected value of the pressure sensor 231 is less than 0.8 MPaG, the detected value of the pressure sensor 232b of the heat storage tank 6b is less than 0.8 MPaG (the heat storage tank 6b has finished radiating heat), and the pressure sensor of the heat storage tank 6a. When the detected value of 232a is equal to or greater than 0.8 MPaG, the control device 80 executes 6a heat radiation operation for controlling the opening of the pressure regulating valve 265a so that the detected value of the pressure sensor 233 becomes 0.8 MPaG. .

  When the heat dissipation of the heat storage tank 6a is also completed (that is, when the detected value of the pressure sensor 232a is less than 0.8 MPaG), the control device 80 executes the boiler operation (see the sixth example in FIG. 3).

FIG. 4 is a diagram showing the relationship between the change in the daily operation mode and the pressure in the solar heat utilization system S ′ according to the second embodiment.
Before sunrise, “6a heat radiation operation” is performed using the remaining heat accumulated on the previous day (until time T _{0 in} FIG. 4), and “boiler operation” is performed after heat radiation operation (time T in FIG. 4). ₀ to time T ₁ ).
After the sunrise, the solar heat collector 1 collects heat, the heat medium vapor is supplied to the gas-liquid separator 2 ′, and the detected value of the pressure sensor 231 becomes 0.8 MPaG or more (in FIG. 4, time T ₁ ). Start driving.
During the day, current heat of solar heat collector 1 is increased, (the detection value of the pressure sensor 231) the gas-liquid separator pressure in the 2 'also rises (in Fig. 4, time T _2, the time T _1).

When the detected value of the pressure sensor 231 becomes 1.5 MPaG or more (time T _{2 in} FIG. 4), “6a heat storage operation” is started in addition to “solar heat operation”. During the heat storage operation, the pressure in the gas-liquid separator 2 ′ (the detection value of the pressure sensor 231) is controlled to be constant.
Further, the heat medium vapor is supplied to the heat storage tank 6a, and the pressure in the heat storage tank 6a (the detected value of the pressure sensor 232a) becomes substantially constant near the pressure corresponding to the melting point of the latent heat storage agent. In this substantially constant time zone, the latent heat storage agent in the heat storage tank 6a is melted and stored as latent heat. When all the latent heat storage agents in the heat storage tank 6a are melted, the pressure in the heat storage tank 6a (detected value of the pressure sensor 232a) rises again.

When the detected value of the pressure sensor 232a becomes 1.5 MPaG or more (in FIG. 4, at time T ₃ ), the “6a heat storage operation” is ended, and the “6b heat storage operation” is started in addition to the “solar heat operation”. The heat medium steam is supplied to the heat storage tank 6b, and the pressure in the heat storage tank 6b (detected value of the pressure sensor 232b) becomes substantially constant near the pressure corresponding to the melting point of the latent heat storage agent. In this substantially constant time zone, the latent heat storage agent in the heat storage tank 6b is melted and stored as latent heat.

In the evening, when the amount of heat collected by the solar heat collector 1 decreases and the detected value of the pressure sensor 231 becomes less than 1.5 MPaG (time T _{4 in} FIG. ₄ ), the “6b heat storage operation” is terminated. Switch to “Driving” only.

Further, when the amount of heat collected by the solar heat collector 1 decreases and the detected value of the pressure sensor 231 becomes less than 0.8 MPaG (time T _{5 in} FIG. 4), the “6b heat radiation operation” is started. The pressure in the heat storage tank 6b (detected value of the pressure sensor 232b) becomes substantially constant near the pressure corresponding to the melting point of the latent heat storage agent. In this substantially constant time zone, the latent heat storage agent in the heat storage tank 6b solidifies and releases the latent heat to generate heat medium vapor.
In addition, since the pressure regulating valves 261, 263a, and 263b are closed due to the “heat radiation operation”, the steam in the gas-liquid separator 2 ′ does not flow elsewhere, and the gas-liquid separator 2 ′ Since the temperature is substantially constant because of the heat insulation, the pressure in the gas-liquid separator 2 '(detected value of the pressure sensor 231) is also substantially constant.

When the detected value of the pressure sensor 232b is less than 0.8 MPaG (time T _{6 in} FIG. 4), the “6b heat dissipation operation” is ended and the “6a heat dissipation operation” is started. The pressure in the heat storage tank 6a (detected value of the pressure sensor 232a) first decreases to near the pressure corresponding to the melting point of the latent heat storage agent and becomes substantially constant. In this substantially constant time zone, the latent heat storage agent in the heat storage tank 6a solidifies and releases the latent heat to generate heat medium vapor.
In addition, since the pressure regulating valves 263b and 265b are closed due to the “6b heat radiation operation”, the steam in the heat storage tank 6b does not flow elsewhere, and since the heat storage tank 6b is insulated, the temperature is increased. Therefore, the pressure in the heat storage tank 6b (detected value of the pressure sensor 232b) is also substantially constant.

When the detection value of the pressure sensor 232a becomes less than _0.8 MPaG (in FIG. 4, time T _{0 on} the next day), the “6a heat radiation operation” is ended and the “boiler operation” is started.
In addition, since the pressure regulating valves 263a and 265a are closed by the “6a heat radiation operation”, the steam in the heat storage tank 6a does not flow elsewhere, and since the heat storage tank 6a is insulated, the temperature is increased. Therefore, the pressure in the heat storage tank 6a (the detection value of the pressure sensor 232a) is also substantially constant.

As described above, according to the solar heat utilization system S ′ according to the second embodiment, the amount of heat collected by the solar heat collector 1 is the amount of steam supplied to the absorption chillers 31, 32, 33 (see FIG. 1). When the amount of heat is greater than the amount of heat, the latent heat storage agent in the latent heat storage agent container 8 disposed in the heat storage tanks 6a and 6b is dissolved from solid to liquid and can be stored as latent heat.
Further, even when the amount of heat collected by the solar heat collector 1 is reduced, by switching the valve, the latent heat storage agent disposed in the heat storage tanks 6a and 6b is solidified from liquid to solid, and steam is generated by the latent heat. Can be generated and supplied to the absorption chillers 31, 32, 33 (see FIG. 1).
Thereby, solar heat utilization system S 'which can utilize efficiently the solar heat collected with the solar heat collector 1 can be provided.
Further, even if the amount of heat collected by the solar heat collector 1 is reduced due to a temporary change in the weather, the boiler 4 can be prevented from operating only for a short time, and is robust against a temporary change in the weather. A solar heat utilization system S ′ can be provided.

Moreover, by setting it as the structure provided with several heat storage tank 6a, 6b, ..., the heat storage amount of solar-heat utilization system S 'can be increased, and it can use for the heat medium vapor | steam supply at nighttime.
Further, by determining the number of fully stored heat storage tanks 6a, 6b,..., The amount of heat stored in the solar heat utilization system S ′ can be estimated.

Note that the solar heat utilization system S (see FIG. 1) and the solar heat utilization system S ′ (see FIG. 2) according to the present embodiment are not limited to the configuration of the above-described embodiment, and do not depart from the spirit of the invention. Various changes can be made.
In the present embodiment, the absorption refrigerators 31, 32, and 33 are double-effect absorption refrigerators, and the heat medium vapor supplied to the absorption refrigerators 31, 32, and 33 via the forward piping 501 is 0. Although described as 8 MPaG (saturation temperature of 175 ° C.), the absorption chillers 31, 32, 33 may be triple effect absorption chillers.
In addition, when the absorption chillers 31, 32, and 33 are triple effect absorption chillers, according to the pressure (saturation temperature) of the heat medium vapor supplied to the absorption chillers 31, 32, and 33 via the outgoing pipe 501. The latent heat storage agent in the latent heat storage agent container 8 is changed.

The latent heat storage agent to be changed is preferably a latent heat storage agent having a melting point higher than the saturation temperature corresponding to the pressure of the heat medium vapor supplied to the absorption refrigerators 31, 32, 33. When the latent heat storage agent is solidified during the heat radiation operation, the heat medium vapor is generated by releasing the latent heat, and the heat medium vapor can be supplied to the absorption refrigerators 31, 32, 33. On the other hand, during the heat storage operation, heat is stored by latent heat when the latent heat storage agent is melted. Therefore, if the melting point of the latent heat storage agent to be changed is too high, there is a possibility that heat cannot be stored by latent heat.
Therefore, for example, the absorption refrigerators 31, 32, 33 are triple effect absorption refrigerators, and the pressure of the heat medium vapor supplied to the absorption refrigerators 31, 32, 33 is 2.2 MPaG (saturation temperature 220 ° C.). In this case, inositol (melting point: 227 ° C.) is preferably used as the latent heat storage agent.

  Moreover, although solar heat utilization system S (S ') which concerns on this embodiment was demonstrated as an open type air conditioning system provided with the cold water tank 50 between the absorption refrigeration machine 31,32,33 and the load 70, a cold water tank 50 may be a closed type air conditioning system.

Further, the solar heat utilization system S (S ′) according to the present embodiment absorbs the steam (heat medium steam) generated by heating the heat medium with the solar heat collected by the solar heat collector 1, and the absorption chillers 31 and 32. , 33 to generate cold water, and the cooling water is supplied to the load 70.
However, the solar heat utilization system S (S ′) according to the present embodiment is not limited to the configuration of the above embodiment. For example, the solar heat utilization system S (S ′) includes the forward piping 501 and the return piping 502. It is good also as an electric power generation system provided with a steam turbine (not shown) instead of the absorption refrigeration machines 31, 32, and 33 to which power is connected and generating electric power using steam generated by solar heat. Further, the solar heat utilization system S (S ′) may be a heat source supply system that supplies steam generated by solar heat as a heat source.

  Moreover, although solar heat utilization system S '(refer FIG. 2) concerning 2nd Embodiment was demonstrated as what does not arrange | position the latent-heat thermal storage agent container 8 in gas-liquid separator 2', 1st Embodiment (refer FIG. 1). ), The latent heat storage agent container 8 may be disposed in the gas-liquid separator 2 ′.

S, S 'Solar heat utilization system 1 Solar heat collector 2, 2' Gas-liquid separator (storage container)
3 Pump (liquid level adjustment mechanism)
4 Boilers 6a, 6b Thermal storage tank (storage container)
7a, 7b Pump (liquid level adjustment mechanism)
8 Latent heat storage agent container 10 Cooling tower 21, 22, 23 Cooling water pump 31, 32, 33 Absorption type refrigerator (supplied device, solar heat utilization device)
41, 42, 43 Chilled water primary pump 50 Chilled water tank 60 Chilled water secondary pump 70 Load 80 Controller 110, 121, 122, 123, 141, 142, 143, 160 Inverter 201, 202, 203, 204, 205, 206 Temperature sensor 211 Humidity sensors 221 and 222 Flow rate sensor 231 Pressure sensor (first pressure detector)
232a, 232b Pressure sensor (second pressure detector)
233 Pressure sensor (third pressure detector)
241,251 On-off valve 252 Holding pressure valve 242 Pressure adjusting valve 260 Pressure adjusting valve 261 Pressure adjusting valve (first pressure adjusting valve)
263a, 263b Pressure regulating valve (second pressure regulating valve)
265a, 265b Pressure regulating valve (third pressure regulating valve)
271a, 271b, 272a, 272b Liquid level adjusting valve (liquid level adjusting mechanism)
281, 282 a, 282 b Liquid level sensor (liquid level adjustment mechanism)
501 Outward piping 502 Return piping

Claims (9)

In the solar heat utilization system that uses the collected solar heat,
A solar heat collector for collecting solar heat and heating the first heat medium;
A storage container for storing the heated first heat medium,
In the internal space of the storage container,
A latent heat storage agent container in which the latent heat storage agent is enclosed is arranged ,
The storage container is
A solar heat utilization system, characterized by being a heat storage tank installed on the downstream side of a gas-liquid separator that separates the first heat medium from the solar heat collector into steam and liquid . The internal space side outlet of the heat storage tank of the pipe extending from the gas-liquid separator toward the internal space of the heat storage tank and through which the vapor of the first heat medium flows,
Solar system according to claim 1, characterized in that it is disposed at a position lower than the liquid level of the liquid to be stored. Solar system according to claim 1 or claim 2, characterized in that said accumulation tank there is a plurality. The storage container is
A liquid level adjusting mechanism for adjusting a liquid level height of the liquid of the first heat medium stored in the internal space of the storage container;
The latent heat storage agent container disposed in the internal space of the storage container,
The solar heat utilization system according to any one of claims 1 to 3, wherein the solar heat utilization system is disposed at a position lower than a liquid level of the liquid to be stored. The solar heat utilization system according to any one of claims 1 to 4 , wherein the latent heat storage agent is pentaerythritol. The solar heat utilization system according to any one of claims 1 to 4 , wherein the latent heat storage agent is dulcitol. It also has an absorption refrigerator,
The solar heat utilization system according to any one of claims 1 to 6 , wherein the absorption refrigerator is operated with steam of the first heat medium to cool the second heat medium. A solar collector that collects solar heat and heats the heat medium;
A gas-liquid separator that separates the heated heat medium into vapor and liquid;
A heat storage tank in which a latent heat storage agent container in which a latent heat storage agent is sealed in an internal space is disposed;
A first pressure regulating valve provided in a pipe that circulates the steam from the gas-liquid separator to a supply apparatus to which steam at a first pressure is supplied;
A second pressure regulating valve provided in a pipe for circulating steam from the gas-liquid separator to the heat storage tank;
A third pressure regulating valve provided in a pipe for circulating steam from the heat storage tank to the supply apparatus;
A first pressure detector for detecting an internal pressure of the gas-liquid separator;
A second pressure detector for detecting an internal pressure of the heat storage tank;
A third pressure detector for detecting the pressure of the steam supplied to the supply apparatus;
Openings of the first pressure adjustment valve, the second pressure adjustment valve, and the third pressure adjustment valve based on the detection results of the first pressure detector, the second pressure detector, and the third pressure detector. A control device for controlling
There is a method for controlling a solar heat utilization system comprising:
The controller is
When the detection value of the first pressure detector is higher than the first pressure, the opening of the first pressure regulating valve is controlled so that the detection value of the third pressure detector approaches the first pressure,
When the detection value of the first pressure detector is higher than a predetermined second pressure higher than the first pressure, the first pressure adjustment valve is set so that the detection value of the third pressure detector approaches the first pressure. And controlling the opening of the second pressure regulating valve so that the detection value of the first pressure detector approaches the second pressure,
When the detection value of the first pressure detector is lower than the first pressure and the detection value of the second pressure detector is higher than the first pressure, the detection value of the third pressure detector is A control method for a solar heat utilization system, wherein the opening of the third pressure regulating valve is controlled to approach the first pressure. The melting point of the latent heat storage agent enclosed in the latent heat storage agent container is:
Higher than a saturation temperature corresponding to the first pressure,
The method for controlling a solar heat utilization system according to claim 8 , wherein the temperature is lower than a saturation temperature corresponding to the second pressure.

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