JP6493247B2 - CO2 supply system - Google Patents

Description

  The present invention relates to a carbon dioxide supply system that supplies carbon dioxide into a horticultural house.

  A carbon dioxide supply system for supplying carbon dioxide to a horticultural house is becoming popular. The carbon dioxide supply system promotes photosynthesis by supplying carbon dioxide to the horticultural plants in the horticultural house, and is used for the purpose of improving the yield and quality of the horticultural plants.

  As this type of carbon dioxide supply system, there is known a system that burns fuel and supplies combustion gas generated along with combustion into the horticultural house. By supplying the combustion gas, combustion heat is supplied into the horticultural house together with carbon dioxide. Thereby, the temperature of the air in a garden house can be raised also in winter etc., and the temperature fall of a garden plant can be suppressed.

  However, even in winter, when the garden house is receiving a lot of solar radiation, if the combustion heat is supplied together with carbon dioxide, the temperature of the air in the garden house will rise excessively and may adversely affect the growth of the garden plant. There is. As a measure for preventing such a situation, it is conceivable to ventilate by opening the skylight of the garden house, etc., but carbon dioxide is also discharged outside the garden house. For this reason, the amount of carbon dioxide supplied by the carbon dioxide supply system into the horticultural house is effectively used for photosynthesis of horticultural plants.

  Patent Document 1 below describes a carbon dioxide supply device that exchanges heat between combustion gas generated in a combustor and water, and supplies the combustion gas whose temperature has decreased into the garden house. Moreover, the water whose temperature rose by heat exchange with the combustion gas is stored in the heat storage tank. The heat energy of the water is used for heating the garden house during a time period when no combustion gas is supplied.

  According to the apparatus described in Patent Document 1 below, for example, during the daytime when the amount of solar radiation is large and photosynthesis can be expected, high temperature water is stored in the heat storage tank while supplying carbon dioxide into the horticultural house, while at night, carbon dioxide is stored. It is possible to heat the horticultural house using high-temperature water supplied from the heat storage tank without supplying carbon.

International Publication No. 2014/010561

  The amount of solar radiation in the morning and in the day changes greatly with time, and the temperature of the air in the garden house also changes depending on the amount of solar radiation. For this reason, when supplying carbon dioxide into the horticultural house, the temperature of the air in the horticultural house may not be an appropriate value from the viewpoint of promoting photosynthesis. The above-mentioned patent document 1 does not disclose sufficient specific means for adjusting the temperature in the horticultural house when supplying carbon dioxide in this way, and further improvement has been desired.

  The present invention has been made in view of such problems, and its purpose is to adjust the temperature of the air in the horticultural house to an appropriate value while supplying carbon dioxide to the horticultural house. To provide a carbon supply system.

  In order to solve the above problems, a carbon dioxide supply system according to the present invention is a carbon dioxide supply system (10) for supplying carbon dioxide into a horticultural house, combusting fuel, and burning the combustion gas into the horticultural house. Through the combustion section (20) to be supplied to the heat sink, the heat absorption heat exchange section (30) for performing heat exchange between the combustion gas and the heat medium and absorbing the heat into the heat medium, and the heat absorption heat exchange section A circulation channel (40) for circulating the heat medium and the circulation channel on the downstream side of the heat-absorbing heat exchanging section are provided to exchange heat between the heat medium and the air in the garden house. A heat exchange section (51) for the first air conditioning and the circulation flow path on the downstream side of the heat exchange section for the first air conditioning, the heat medium supplied from the upstream side is caused to flow into the interior and stored; And, as the heat medium flows in, the stored heat medium is moved downstream. A storage section (60) to be discharged and a heat exchange section for second air conditioning that is provided in the circulation channel downstream of the storage section and exchanges heat between the heat medium and the air in the garden house. (52) and a control unit (90) for controlling the combustion unit, the first air conditioning heat exchange unit, and the second air conditioning heat exchange unit. The controller heats the air in the horticultural house by operating at least one of the first air conditioning heat exchange unit and the second air conditioning heat exchange unit without operating the combustion unit. By operating the combustion unit and the first air conditioning heat exchange unit without operating the mode and the second air conditioning heat exchange unit, carbon dioxide is supplied while heating the air in the horticultural house By operating the combustion unit and the second air conditioning heat exchange unit without operating the heating supply mode and the first air conditioning heat exchange unit, carbon dioxide is cooled while cooling the air in the garden house. The cooling supply mode to be supplied is executed.

  According to this structure, a control part heats the air in a garden house without supplying a carbon dioxide in a garden house by execution of heating mode. In the heating mode, at least one of the first air conditioning heat exchange unit and the second air conditioning heat exchange unit causes heat exchange between the high-temperature heat medium supplied from the storage unit and the air in the garden house. By heating the air in the garden house. If this heating mode is executed at night when photosynthesis is not expected, it is possible to control the temperature drop of the air in the horticultural house without supplying carbon dioxide and to adjust it to a value that does not inhibit the growth of horticultural plants. It becomes.

  Moreover, a control part supplies a carbon dioxide, heating the air in a garden house by execution of heating supply mode. In the heating supply mode, the air in the horticultural house is heated by causing the first air conditioning heat exchanging section to exchange heat between the heat medium absorbed from the combustion gas and the air in the horticultural house. In the morning, the amount of solar radiation increases rapidly with sunrise, but the air temperature in the garden house is still low. If the heating supply mode is executed in the morning, the air in the garden house can be quickly raised, carbon dioxide can be supplied, and photosynthesis of the garden plants can be promoted.

  Moreover, a control part supplies a carbon dioxide, cooling the air in a garden house by execution of the cooling supply mode. In the cooling supply mode, the air in the horticultural house is cooled by causing the second air conditioning heat exchange section to exchange heat between the low-temperature heat medium supplied from the storage section and the air in the horticultural house. To do. This low-temperature refrigerant is stored in the storage unit when the heating mode is executed. If the cooling supply mode is executed in the daytime when the amount of solar radiation is high, it is possible to suppress the excessive increase in the temperature of the air in the garden house while supplying carbon dioxide and to promote the photosynthesis of the garden plants. It becomes possible.

  Furthermore, another carbon dioxide supply system according to the present invention is a carbon dioxide supply system (10A) for supplying carbon dioxide into a horticultural house, and combusts fuel and supplies combustion gas into the horticultural house. Part (20), heat-exchanging heat exchanger (30) for causing heat exchange between the combustion gas and the heat medium to absorb heat, and circulating the heat medium via the heat-absorbing heat exchanger A circulation channel (40A) to be provided, and the circulation channel provided downstream of the heat-absorbing heat exchanging unit, and a heat medium supplied from the upstream side is allowed to flow in and stored therein, and the heat medium With the inflow, the storage section (60) for discharging the stored heat medium to the downstream side and the circulation channel are provided, and heat exchange is performed between the heat medium and the air in the garden house. The third air conditioning heat exchanger (53) to be turned off and the circulation channel A switching valve (46) for switching, supplying a heat medium supplied from the heat absorption heat exchange unit to the storage unit, and supplying a heat medium flowing out from the storage unit to the third air conditioning heat exchange unit The switching valve that switches between a first circulation state and a second circulation state in which the heat medium supplied from the heat absorption heat exchange unit is supplied to the third air conditioning heat exchange unit without being supplied to the storage unit. And a control section (90A) for controlling the combustion section, the third air conditioning heat exchange section, and the switching valve. The controller is configured to heat the air in the horticultural house by operating the third air conditioning heat exchange unit without operating the combustion unit, with the circulation channel in the first circulation state. Then, the air in the horticultural house is heated in the third air conditioning heat exchange section by operating the combustion section and the third air conditioning heat exchange section with the circulation flow path in the second circulation state. In the third air conditioning heat exchange section, the heating supply mode for supplying carbon dioxide while the switching valve is in the first circulation state and the combustion section and the third air conditioning heat exchange section are operated. And a cooling supply mode for supplying carbon dioxide while cooling the air in the garden house.

  According to this configuration, the control unit executes the heating mode, the heating supply mode, and the cooling supply mode by using the third air conditioning heat exchange unit for heating and cooling the air in the garden house.

  In the heating mode, the control unit supplies the heat medium supplied from the storage unit to the third air conditioning heat exchange unit by setting the circulation flow path to the first circulation state using the switching valve. In the heating mode, the air in the horticultural house is heated by causing heat exchange between the high-temperature heat medium supplied from the storage section and the air in the horticultural house in the third air conditioning heat exchanging section.

  In addition, in the heating supply mode, the control unit sets the circulation flow path to the second circulation state by the switching valve, so that the heat medium supplied from the heat-absorbing heat exchange unit is not supplied to the storage unit. Supply to heat exchanger. In the heating supply mode, in the third air conditioning heat exchange unit, heat exchange is performed between the high-temperature heat medium supplied from the heat absorption heat exchange unit and the air in the garden house. Heat.

  Moreover, a control part supplies the heat medium supplied from a storage part to the heat exchange part for 3rd air conditioning by making a circulation flow path into a 1st circulation state with a switching valve in the cooling supply mode. In the cooling supply mode, the third air conditioning heat exchange section cools the air in the garden house by causing heat exchange between the low-temperature heat medium supplied from the storage section and the air in the garden house. .

  ADVANTAGE OF THE INVENTION According to this invention, the carbon dioxide supply system which can be adjusted so that the temperature of the air in a horticultural house may become an appropriate value can be provided, supplying carbon dioxide in a horticultural house.

It is a mimetic diagram showing the mode at the time of heating mode execution of the carbon dioxide supply system concerning a 1st embodiment. It is a graph which shows the change of the temperature used as the target of the air in a garden house, and the change of the temperature of the air outside a garden house. It is a schematic diagram which shows the aspect at the time of heating supply mode execution of the carbon dioxide supply system which concerns on 1st Embodiment. It is a schematic diagram which shows the aspect at the time of cooling supply mode execution of the carbon dioxide supply system which concerns on 1st Embodiment. It is a schematic diagram which shows the aspect at the time of heating mode execution of the carbon dioxide supply system which concerns on 2nd Embodiment. It is a schematic diagram which shows the aspect at the time of heating supply mode execution of the carbon dioxide supply system which concerns on 2nd Embodiment. It is a schematic diagram which shows the aspect at the time of cooling supply mode execution of the carbon dioxide supply system which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  A configuration of a carbon dioxide supply system 10 (hereinafter also simply referred to as “system 10”) according to the first embodiment will be described with reference to FIG. The system 10 is applied to the horticultural house 100, and includes a combustor 20, a heat absorption heat exchanger 30, a circulation channel 40, a first air conditioning heat exchange unit 51, and a second air conditioning heat exchange unit 52, A tank 60, a room temperature sensor 81, a water temperature sensor 82, and a control unit 90 are provided.

  The garden house 100 is a greenhouse that houses a garden plant (not shown). The garden house 100 is divided into a cultivation space 110 and a middle chamber 120 by a partition wall 130, and garden plants such as strawberries and tomatoes are accommodated in the cultivation space 110. The horticultural house 100 is made of glass, film, or the like excellent in translucency and weather resistance as a building material, and the interior is a highly airtight space. Thereby, the inside of the horticultural house 100 can be warmed and heated by solar radiation that permeates the building materials, and can promote the photosynthesis of the horticultural plants.

  The combustor 20 is a device that is disposed in the cultivation space 110, generates a gas containing a high concentration of carbon dioxide, and supplies the gas to the cultivation space 110. The combustor 20 generates combustion gas containing carbon dioxide by burning heavy oil or kerosene as fuel.

  The heat-absorbing heat exchanger 30 is a device that exchanges heat between the combustion gas generated in the combustor 20 and water that is a heat medium. The heat absorption heat exchanger 30 is disposed in the cultivation space 110 and is formed integrally with the combustor 20. Since the combustion gas generated in the combustor has a high temperature, the water that performs heat exchange in the heat absorption heat exchanger 30 absorbs heat from the combustion gas and becomes high-temperature water.

  The circulation channel 40 is a channel formed in an annular shape through the heat-absorbing heat exchanger 30. The circulation channel 40 is disposed across the cultivation space 110 and the middle chamber 120. The circulation channel 40 is provided with a pump 45, and water is circulated in the circulation channel 40 by driving the pump 45. When the fuel is burned in the combustor 20, the water absorbs heat when passing through the heat-absorbing heat exchanger 30, and the temperature rises, while the fuel is not burned in the combustor 20. In such a case, water passes through the endothermic heat exchanger 30 without absorbing heat.

  The first air conditioning heat exchange unit 51 is provided in the circulation flow path 40 on the downstream side of the heat absorption heat exchanger 30 and is disposed in the cultivation space 110. The first air conditioning heat exchange unit 51 includes a heat exchanger 511 and a fan 512.

  The heat exchanger 511 has a flow path through which water flows. The fan 512 is an electric blower, and the air in the garden house 100 is sucked by driving the fan 512 and passes through the outer surface of the heat exchanger 511. In the heat exchanger 511, heat exchange is performed between the water supplied from the endothermic heat exchanger 30 and the air in the garden house 100, and the air whose temperature has changed blows out into the garden house 100 by the fan 512. Is done. The water that has passed through the flow path in the heat exchanger 511 is further supplied to the circulation flow path 40 on the downstream side.

  The tank 60 is a container that can store water therein. The tank 60 is provided in the circulation flow path 40 on the downstream side of the first air-conditioning heat exchange unit 51, and stores water supplied from the upstream side into the interior. The tank 60 is configured to cause the water stored therein to flow out to the downstream side with the inflow of water from the upstream side. Moreover, the tank 60 has a heat insulating material (not shown) and has a heat retaining function for suppressing the temperature drop of the stored water.

  The second air conditioning heat exchange unit 52 is provided in the circulation flow path 40 on the downstream side of the heat absorption heat exchanger 30 and is disposed in the cultivation space 110. The second air conditioning heat exchange unit 52 includes a heat exchanger 521 and a fan 522.

  The heat exchanger 521 has a flow path through which water flows. The fan 522 is an electric blower, and sucks the air in the garden house 100 by driving the fan 522 and passes the outer surface of the heat exchanger 521. In the heat exchanger 521, heat exchange is performed between the water supplied from the tank 60 and the air in the garden house 100, and the air whose temperature has changed is blown out into the garden house 100 by the fan 522. The water that has passed through the flow path in the heat exchanger 521 is further supplied to the circulation flow path 40 on the downstream side.

  The room temperature sensor 81 is a device that is arranged in the cultivation space 110 and detects the temperature of the air in the garden house 100 (hereinafter also simply referred to as “house temperature”). The room temperature sensor 81 generates a detection signal corresponding to the temperature in the house and transmits it to the control unit 90.

  The water temperature sensor 82 is a device that is disposed in the circulation channel 40 and detects the temperature of the water flowing through the circulation channel 40. Specifically, the water temperature sensor 82 is disposed in the circulation flow path 40 upstream of the second air conditioning heat exchange unit 52 and downstream of the tank 60 and is supplied to the second air conditioning heat exchange unit 52. Detect water temperature. The water temperature sensor 82 generates a detection signal corresponding to the temperature of the water and transmits the detection signal to the control unit 90.

  The control unit 90 is an electronic device that is disposed in the middle chamber 120 and part or all of which is configured by an analog circuit or configured as a digital processor. The control part 90 transmits a control signal to the combustor 20, the 1st air conditioning heat exchange part 51, and the 2nd air conditioning heat exchange part 52, and controls those operations. Specifically, the control unit 90 controls combustion in the combustor 20 and its stop. The control unit 90 controls the heat exchange in the first air conditioning heat exchange unit 51 and the second air conditioning heat exchange unit 52 by controlling the driving and stopping of the fan 512 and the fan 522. Further, the control unit 90 performs a predetermined calculation based on detection signals received from the room temperature sensor 81 and the water temperature sensor 82, and calculates the temperature in the house and the temperature of the water supplied to the second air conditioning heat exchange unit 52. get.

  Next, a plurality of operation modes executed by the control unit 90 will be described with reference to FIGS. 1 to 4.

  FIG. 2 exemplifies, with a solid line, a change in a target temperature of air in the garden house 100 (hereinafter also simply referred to as “target temperature”) from the viewpoint of the growth of the garden plant. FIG. 2 illustrates the change in the temperature of the air outside the horticultural house 100 (hereinafter also simply referred to as “outside air temperature”) with a broken line. This target temperature becomes a threshold value when the system 10 executes a heating supply mode and a cooling supply mode which will be described later.

  At night (for example, from about 19 o'clock to about 7 o'clock the next day), since the solar radiation is not supplied to the garden house 100, photosynthesis of the garden plants is not performed. For this reason, it is not necessary to supply carbon dioxide into the garden house 100. That is, at night, the air in the horticultural house 100 may be heated appropriately to such an extent that the horticultural plants become low temperature and growth is not hindered. Although the target temperature at this time changes with kinds of garden plants, it can be set as about 15 degreeC, for example.

  In addition, from midnight to the morning (for example, from about 2 o'clock to about 7 o'clock), there is a risk that condensation will occur on the leaves of garden plants as the outside air temperature decreases. Such condensation causes mold generation, discoloration, and the like, and adversely affects the quality of garden plants. Therefore, in the morning from midnight, in order to prevent condensation, it is preferable to heat the air in the horticultural house 100 and gradually increase the temperature in the house.

  In the morning (for example, from about 7 o'clock to about 9 o'clock), the amount of solar radiation supplied to the garden house 100 increases rapidly with sunrise. Therefore, in the morning, in order to promote the photosynthesis of the horticultural plants, it is preferable to supply carbon dioxide into the horticultural house 100 and to heat the air in the horticultural house 100 to quickly raise the temperature in the house.

  Further, during the daytime (for example, from about 9 o'clock to about 17 o'clock), the temperature inside the house tends to be high as the outside air temperature increases and the amount of solar radiation increases. Therefore, in the daytime, in order to promote photosynthesis of horticultural plants, it is preferable to supply carbon dioxide into the horticultural house 100 and adjust the house temperature to an appropriate value. That is, when the house temperature is lower than the target temperature, the air in the horticultural house 100 is heated while supplying carbon dioxide, while when the house temperature is higher than the target temperature, the carbon dioxide is supplied. It is preferable to cool the air in the gardening house 100.

  Also, in the evening (for example, from about 17:00 to around 19:00), the house temperature tends to decrease rapidly as the outside air temperature decreases and the amount of solar radiation decreases. This slows down the photosynthesis of the horticultural plant.

  However, when the temperature in the house decreases in the evening, the supply of moisture and nutrients from the roots of the garden plants to the leaves and fruits is encouraged. That is, the reduction of the house temperature here is suitable for the growth of garden plants. Therefore, in the evening, there is no need to supply carbon dioxide into the garden house 100 or to heat the air in the garden house 100.

  The controller 90 executes the heating mode, the heating supply mode, and the cooling supply mode in order to set the house temperature to a value close to such a target temperature. Hereinafter, the operation of the system 10 in each operation mode will be described.

[Heating mode]
The control unit 90 executes the heating mode at night. FIG. 1 shows the operation of the system 10 in the heating mode.

  The controller 90 drives the pump 45 without burning the fuel in the combustor 20. Thereby, the water of the circulation channel 40 passes through the heat-absorbing heat exchanger 30 without absorbing heat.

  The control unit 90 does not drive the fan 512 of the first air conditioning heat exchange unit 51. Thereby, the water of the circulation flow path 40 passes through the heat exchange part 51 for 1st air conditioning, without performing heat exchange with the air in the garden house 100. The water that has passed through the first air conditioning heat exchanger 51 flows into the tank 60 on the downstream side.

  By the way, high-temperature water is stored in the tank 60 at the start of the heating mode. The hot water in the tank 60 is stored when the heating supply mode and the cooling supply mode are executed in the morning or the daytime, as will be described later. When water flows into the tank 60 from the upstream side, along with the inflow, high-temperature water stored therein until then flows out to the downstream side. The high-temperature water that has flowed out of the tank 60 is guided to the second air conditioning heat exchange unit 52 by the circulation flow path 40.

  The control unit 90 drives the fan 522 of the second air conditioning heat exchange unit 52. Thereby, in the heat exchanger 521 of the heat exchange unit 52 for the second air conditioning, heat exchange is performed between the high-temperature water supplied from the tank 60 and the air in the garden house 100. As a result, the air is heated to rise in temperature, and is blown out into the garden house 100 by the fan 522 as indicated by an arrow H1. The control unit 90 controls the flow rate of high-temperature water supplied to the second air conditioning heat exchange unit 52 and the horticulture so that the temperature in the house detected by the room temperature sensor 81 approaches the ideal temperature at night shown in FIG. The flow rate of the air blown into the house 100 is adjusted.

  By executing such a heating mode, the air in the garden house 100 can be heated without supplying carbon dioxide into the garden house 100 at night when photosynthesis of the garden plants is not performed. Thereby, the temperature in a house can be maintained to the extent that a garden plant becomes low temperature and growth is not inhibited. Further, in the morning from midnight when prevention of condensation is required, if heat exchange is activated by increasing the flow rate of high-temperature water supplied to the second air conditioning heat exchange section 52, the inside of the house without supplying carbon dioxide. The temperature can be increased gradually.

  Here, in the second air conditioning heat exchange section 52, heat exchange is performed between the high-temperature water supplied from the tank 60 and the air in the garden house 100, but the heating mode is this mode. It is not limited to. For example, heat exchange between the high-temperature water and the air in the garden house 100 may be performed in the first air-conditioning heat exchange unit 51 instead of the second air-conditioning heat exchange unit 52, or for the second air-conditioning. In addition to the heat exchange part 52, you may perform in the heat exchange part 51 for 1st air conditioning. That is, the heating of the air in the horticultural house 100 using the high-temperature water supplied from the tank 60 may be performed in at least one of the first air conditioning heat exchange unit 51 and the second air conditioning heat exchange unit 52.

[Heating supply mode]
The control unit 90 executes the heating supply mode in the morning. Moreover, the control part 90 performs heating supply mode also in daytime, when the house temperature is lower than the target temperature shown by FIG. FIG. 3 shows the operation of the system 10 in the heating supply mode.

  The controller 90 burns fuel in the combustor 20 and drives the pump 45. Thereby, as shown by the arrow G1, the combustion gas containing a carbon dioxide is supplied in the garden house 100. The temperature of the combustion gas containing carbon dioxide is lowered when heat is exchanged with the water in the circulation flow path 40 that passes through the heat-absorbing heat exchanger 30. On the other hand, the water in the circulation channel 40 absorbs heat when passing through the endothermic heat exchanger 30 and the temperature rises.

  Further, the control unit 90 drives the fan 512 of the first air conditioning heat exchange unit 51. Thereby, in the heat exchanger 511 of the heat exchange part 51 for 1st air conditioning, heat exchange is performed between the high temperature water supplied from the heat exchanger 30 for heat absorption, and the air in the garden house 100. As a result, the air is heated to rise in temperature, and is blown out into the garden house 100 by the fan 512 as indicated by an arrow H2. The controller 90 controls the flow rate of high-temperature water supplied to the first air conditioning heat exchanger 51 and the horticulture so that the temperature in the house detected by the room temperature sensor 81 approaches the morning target temperature shown in FIG. The flow rate of the air blown into the house 100 is adjusted. The water that has passed through the first air conditioning heat exchanger 51 flows into the tank 60 on the downstream side.

  By the way, low temperature water is stored in the tank 60 at the start of the heating supply mode. The low-temperature water in the tank 60 is stored in the heating mode executed at night as described above.

  The temperature of the water that has passed through the first air conditioning heat exchanger 51 in the heating supply mode is lowered when heat is exchanged with the air in the garden house 100. However, the temperature of the water that has passed through the first air conditioning heat exchange unit 51 is sufficiently higher than the water stored in the tank 60.

  Accordingly, water flows into the tank 60 from the upstream side, and with the inflow, low-temperature water that has been stored in the tank 60 until then flows out to the downstream side, and is stored in the tank 60. The water temperature rises gradually. The low-temperature water that has flowed out of the tank 60 is guided to the second air conditioning heat exchange section 52 by the circulation flow path 40.

  The control unit 90 does not drive the fan 522 of the second air conditioning heat exchange unit 52. Thereby, the water of the circulation flow path 40 passes through the heat exchange part 52 for 2nd air conditioning, without performing heat exchange with the air in the garden house 100.

  By executing such a heating supply mode, carbon dioxide is supplied into the garden house 100 in the morning when the photosynthesis of the garden plants gradually becomes active, or in the daytime when the house temperature is lower than the target temperature shown in FIG. However, the air in the garden house 100 can be heated. Thereby, the temperature in the house can be quickly raised and brought close to the target temperature while supplying carbon dioxide to the garden plant.

[Cooling supply mode]
The controller 90 executes the cooling supply mode during daytime when the house temperature is higher than the target temperature shown in FIG. FIG. 4 shows the operation of the system 10 in the cooling supply mode.

  The controller 90 burns fuel in the combustor 20 and drives the pump 45. Thereby, as shown by arrow G2, the combustion gas containing a carbon dioxide is supplied in the garden house 100. The temperature of the combustion gas containing carbon dioxide is lowered when heat is exchanged with the water in the circulation flow path 40 that passes through the heat-absorbing heat exchanger 30. On the other hand, the water in the circulation channel 40 absorbs heat when passing through the endothermic heat exchanger 30 and the temperature rises.

  The control unit 90 does not drive the fan 512 of the first air conditioning heat exchange unit 51. Thereby, the water of the circulation flow path 40 passes through the heat exchange part 51 for 1st air conditioning, without performing heat exchange with the air in the garden house 100.

  By the way, low temperature water is stored in the tank 60 at the start of the cooling supply mode. The low-temperature water in the tank 60 is stored in the heating mode executed at night as described above. By executing the morning heating supply mode described above, the temperature of the water is higher than that at the start of the execution of the heating supply mode, but is lower than the temperature in the house during the daytime.

  Accordingly, water flows into the tank 60 from the upstream side, and with the inflow, low-temperature water that has been stored in the tank 60 until then flows out to the downstream side, and is stored in the tank 60. The water temperature rises gradually. The low-temperature water that has flowed out of the tank 60 is guided to the second air conditioning heat exchange section 52 by the circulation flow path 40.

  The control unit 90 drives the fan 522 of the second air conditioning heat exchange unit 52. Thereby, in the heat exchanger 521 of the heat exchange unit 52 for the second air conditioning, heat exchange is performed between the low-temperature water supplied from the tank 60 and the air in the garden house 100. As a result, the air is cooled and its temperature is lowered, and is blown out into the garden house 100 by the fan 522 as indicated by an arrow C1. The controller 90 controls the flow rate of low-temperature water supplied to the second air-conditioning heat exchange unit 52 and the horticulture so that the temperature in the house detected by the room temperature sensor 81 approaches the target temperature at night shown in FIG. The flow rate of the air blown into the house 100 is adjusted.

  By executing such a cooling supply mode, the air in the garden house 100 can be cooled while supplying carbon dioxide into the garden house 100 in the daytime when the house temperature is higher than the target temperature shown in FIG. it can. Thereby, while supplying carbon dioxide to the garden plant, the temperature in the house can be rapidly lowered to approach the target temperature.

  Note that air can be cooled in the second air-conditioning heat exchange section 52 only when the temperature of the water supplied from the tank 60 is lower than the house internal temperature. Therefore, when the temperature of the water detected based on the water temperature sensor 82 is higher than the house temperature, the control unit 90 prohibits the execution of the cooling supply mode. That is, when the temperature of the water supplied to the second air conditioning heat exchange unit 52 becomes higher than the house internal temperature, the control unit 90 stops the fan 522 of the second air conditioning heat exchange unit 52 and the water and garden house. Heat exchange with air in 100 is not performed.

  Next, effects obtained by the system 10 according to the first embodiment will be described.

  According to the configuration of the system 10, the control unit 90 heats the air in the garden house 100 without supplying carbon dioxide into the garden house 100 by executing the heating mode. In the heating mode, at least one of the first air conditioning heat exchange unit 51 and the second air conditioning heat exchange unit 52 exchanges heat between the high-temperature water supplied from the tank 60 and the air in the garden house 100. By carrying out, the air in the garden house 100 is heated. If the heating mode is executed at night when photosynthesis is not expected, it is possible to adjust the temperature of the horticultural house so that growth of the horticultural plants is not hindered without supplying carbon dioxide. It becomes.

  Moreover, the control part 90 supplies a carbon dioxide, heating the air in the garden house 100 by execution of heating supply mode. In the heating supply mode, the air in the garden house 100 is heated by causing heat exchange between the water absorbed from the combustion gas and the air in the garden house 100 in the first air conditioning heat exchange unit 51. . In the morning, etc., the amount of solar radiation increases rapidly with sunrise, but the temperature of the air in the garden house 100 is still low. If the heating supply mode is executed in the morning, the air in the garden house 100 can be quickly raised, carbon dioxide can be supplied, and photosynthesis of the garden plants can be promoted.

  In addition, the control unit 90 supplies carbon dioxide while cooling the air in the garden house 100 by executing the cooling supply mode. In the cooling supply mode, the air in the garden house 100 is exchanged between the low-temperature water supplied from the tank 60 and the air in the garden house 100 in the second air conditioning heat exchange unit 52. Cool down. This low-temperature refrigerant is stored in the storage unit when the heating mode is executed. If the said heating mode is performed in the daytime etc., it will become possible to suppress that the temperature of the air in the garden house 100 increases too much, and to promote the photosynthesis of a garden plant, supplying carbon dioxide.

  In addition, the system 10 includes a room temperature sensor 81 that detects the temperature of the air in the garden house 100. The control unit 90 executes the heating supply mode when the temperature of the air in the garden house 100 is lower than a target temperature that is a preset threshold, while the temperature of the air in the garden house is higher than the target temperature. In this case, the cooling supply mode is executed. Thereby, the temperature of the air in the garden house 100 can be adjusted to a value close to the target temperature, and photosynthesis of the garden plants can be promoted.

  Moreover, the target temperature which is a threshold value is set so as to change with time. Thereby, according to the solar radiation amount which changes with time, the temperature of the air in the garden house 100 can be changed, and the photosynthesis of a garden plant can be accelerated | stimulated.

  The system 10 also includes a water temperature sensor 82 that detects the temperature of the water supplied to the second air conditioning heat exchange unit 52. When the temperature detected by the water temperature sensor 82 is higher than the temperature detected by the room temperature sensor 81, the control unit 90 prohibits the execution of the cooling supply mode. Thereby, although it is necessary to cool the air in the horticultural house 100, it is possible to prevent the air from being heated by mistake in the second air conditioning heat exchange section 52.

  Subsequently, a carbon dioxide supply system 10A (hereinafter also simply referred to as “system 10A”) according to the second embodiment will be described with reference to FIGS. This system 10A is applied to the horticultural house 100 as in the first embodiment, and supplies carbon dioxide and adjusts the temperature in the house. The system 10A is different from the first embodiment in that air is heated and cooled by a single heat exchanger, the configuration of a flow path for circulating water as a heat medium, and the like. In the system 10A, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The system 10 includes a combustor 20, an endothermic heat exchanger 30, a circulation flow path 40 </ b> A, a switching valve 46, a third air conditioning heat exchange unit 53, a tank 60, a room temperature sensor 81, and a water temperature sensor 82. And a control unit 90A.

  The circulation channel 40A has a first circulation channel 41A and a second circulation channel 42A. The first circulation channel 41A and the second circulation channel 42A are formed independently of each other.

  The first circulation channel 41A is a channel extending from the end 41A1 to the end 41A2, and is disposed in the cultivation space 110. Since the end portion 41A1 and the end portion 41A2 are arranged in the vicinity of each other, the first circulation channel 41A has a substantially annular shape. An endothermic heat exchanger 30 is provided in the first circulation channel 41A. A pump 45 is provided in the first circulation passage 41 </ b> A on the upstream side of the heat absorption heat exchanger 30. By driving the pump 45, water as a heat medium flows through the first circulation passage 41A and is supplied to the heat-absorbing heat exchanger 30.

  The second circulation channel 42 </ b> A is a channel extending from the end 42 </ b> A <b> 1 to the end 42 </ b> A <b> 2 and is disposed across the cultivation space 110 and the middle chamber 120. Since the end portion 42A1 and the end portion 42A2 are disposed in the vicinity of each other, the second circulation channel 42A has a substantially annular shape. A tank 60 is provided in the second circulation channel 42A.

  The switching valve 46 is a channel switching mechanism that is disposed between the end portions 41A1 and 41A2 of the first circulation channel 41A and the end portions 42A1 and 42A2 of the second circulation channel 42A. The switching valve 46 functions to switch between the first circulation state and the second circulation state of the circulation passage 40A by the rotation of the valve body having the passage inside.

  As shown in FIGS. 5 and 7, the first circulation state connects the end portion 41A1 of the first circulation channel 41A and the end portion 42A2 of the second circulation channel 42A, and the first circulation channel 41A The end 41A2 and the end 42A1 of the second circulation channel 42A are connected. In the first circulation state, the first circulation channel 41A is connected to the second circulation channel 42A, and one closed circuit is formed as a whole.

  In the second circulation state, as shown in FIG. 6, the end 41A1 and the end 41A2 of the first circulation channel 41A are connected, and the end 42A1 and the end 42A2 of the second circulation channel 42A are connected. It is in the state. In the second circulation state, the first circulation channel 41A is disconnected from the second circulation channel 42A, and a closed circuit is formed by each of the first circulation channel 41A and the second circulation channel 42A.

  The third air conditioning heat exchanging portion 53 is provided in the first circulation passage 41 </ b> A upstream of the pump 45. The third air conditioning heat exchanging unit 53 includes a heat exchanger 531 and a fan 532.

  The heat exchanger 531 has a flow path through which water flows. The fan 532 is an electric blower, and sucks air in the garden house 100 by driving the fan 532 to pass the outer surface of the heat exchanger 531. In the heat exchanger 531, heat exchange is performed between the water supplied from the upstream side and the air in the garden house 100, and the air whose temperature has changed is blown out into the garden house 100 by the fan 532. The water that has passed through the flow path in the heat exchanger 531 is further supplied to the circulation flow path 40 on the downstream side.

  The water temperature sensor 82 is a device that is disposed in the first circulation channel 41A and detects the temperature of water flowing through the first circulation channel 41A. Specifically, the water temperature sensor 82 is disposed in the first circulation passage 41 </ b> A between the end portion 41 </ b> A <b> 1 and the third air conditioning heat exchange unit 53, and the temperature of the water supplied to the third air conditioning heat exchange unit 53. Is detected. The water temperature sensor 82 generates a detection signal corresponding to the temperature of the water and transmits it to the control unit 90A.

  The control unit 90 </ b> A is an electronic device that transmits control signals to the combustor 20 and the third air conditioning heat exchange unit 53 to control their operations. Specifically, the control unit 90A controls combustion in the combustor 20 and its stop. The control unit 90 </ b> A controls heat exchange in the third air conditioning heat exchange unit 53 by controlling the driving and stopping of the fan 532. In addition, the control unit 90A performs a predetermined calculation based on detection signals received from the room temperature sensor 81 and the water temperature sensor 82, and calculates the temperature in the house and the temperature of the water supplied to the third air conditioning heat exchange unit 53. get.

  Similarly to the system 10 according to the first embodiment, the system 10A configured as described above executes the heating mode, the heating supply mode, and the cooling supply mode in order to set the house temperature to a value close to the target temperature. To do. Hereinafter, the operation of the system 10A in each operation mode will be described. Of the operation modes, differences from the first embodiment will be mainly described.

[Heating mode]
As shown in FIG. 5, the control unit 90 </ b> A operates the switching valve 46 and drives the pump 45 so that the circulation flow path 40 </ b> A is in the first state without burning the fuel in the combustor 20. As a result, the water in the first circulation channel 41A passes through the heat-absorbing heat exchanger 30 without absorbing heat. Further, the water that has passed through the heat-absorbing heat exchanger 30 flows from the end portion 42A1 into the second circulation passage 42A via the end portion 41A2 of the first circulation passage 41A and the switching valve 46. The water that has passed through the end 42A1 flows into the tank 60 on the downstream side.

  By the way, high-temperature water is stored in the tank 60 at the start of the heating mode. The hot water in the tank 60 is stored when the cooling supply mode is executed, as will be described later.

  When water flows into the tank 60 from the upstream side, along with the inflow, high-temperature water stored therein until then flows out to the downstream side. The high-temperature water that has flowed out of the tank 60 flows downstream of the second circulation channel 42A.

  This high-temperature water flows from the end portion 41A1 into the first circulation passage 41A via the end portion 42A2 of the second circulation passage 42A and the switching valve 46. Further, the high-temperature water is guided to the third air conditioning heat exchange unit 53 by the first circulation channel 41A.

  90 A of control parts drive the fan 532 of the heat exchange part 53 for 3rd air conditioning. Thereby, in the heat exchanger 531 of the heat exchange unit 53 for the third air conditioning, heat exchange is performed between the high-temperature water supplied from the tank 60 and the air in the garden house 100. As a result, the air absorbs heat from water and rises in temperature, and is blown out into the garden house 100 by the fan 532 as indicated by an arrow H3. The controller 90A controls the flow rate of hot water supplied to the third air conditioning heat exchange unit 53 so that the temperature in the house detected by the room temperature sensor 81 approaches the target temperature shown in FIG. Adjust the flow rate of the air blown into the inside.

[Heating supply mode]
As shown in FIG. 6, the controller 90 </ b> A burns fuel in the combustor 20, operates the switching valve 46 so that the circulation flow path 40 </ b> A is in the second state, and drives the pump 45. Thereby, as shown by arrow G3, the combustion gas containing a carbon dioxide is supplied in the garden house 100. Further, the water that has passed through the endothermic heat exchanger 30 and has absorbed heat from the combustion gas passes through the end portion 41A1 of the first circulation passage 41A and the switching valve 46 again from the end portion 41A1 to the first circulation passage. It flows into 41A.

  In addition, the control unit 90A drives the fan 532 of the third air conditioning heat exchange unit 53. Thereby, in the heat exchanger 531 of the third air conditioning heat exchange unit 53, heat exchange is performed between the high-temperature water supplied from the heat absorption heat exchanger 30 and the air in the garden house 100. As a result, the air is heated to rise in temperature, and is blown out into the garden house 100 by the fan 532 as indicated by an arrow H4. The controller 90A controls the flow rate of high-temperature water supplied to the third air conditioning heat exchanger 53 and the horticulture so that the in-house temperature detected by the room temperature sensor 81 approaches the morning target temperature shown in FIG. The flow rate of the air blown into the house 100 is adjusted. The water that has passed through the third air-conditioning heat exchange section 53 is guided again to the heat-absorbing heat exchanger 30 by the first circulation channel 41A.

[Cooling supply mode]
As shown in FIG. 7, the controller 90 </ b> A burns fuel in the combustor 20, operates the switching valve 46 so that the circulation flow path 40 </ b> A is in the first state, and drives the pump 45. Thereby, as shown by arrow G4, the combustion gas containing a carbon dioxide is supplied in the garden house 100. Further, the water that has absorbed heat from the combustion gas through the endothermic heat exchanger 30 passes through the end portion 41A2 of the first circulation passage 41A and the switching valve 46 from the end portion 42A1 to the second circulation passage 42A. Flow into. The water that has passed through the end 42A1 flows into the tank 60 on the downstream side.

  Low temperature water is stored in the tank 60 at the start of the cooling supply mode. The low-temperature water in the tank 60 is stored in the heating mode described above.

  Accordingly, water flows into the tank 60 from the upstream side, and with the inflow, low-temperature water that has been stored in the tank 60 until then flows out to the downstream side, and is stored in the tank 60. The water temperature gradually rises from the top of the tank. The low-temperature water that has flowed out of the tank 60 flows downstream of the second circulation channel 42A.

  This low-temperature water flows from the end portion 41A1 into the first circulation passage 41A via the end portion 42A2 of the second circulation passage 42A and the switching valve 46. Further, the low-temperature water is guided to the third air conditioning heat exchange unit 53 by the first circulation channel 41A.

  90 A of control parts drive the fan 532 of the heat exchange part 53 for 3rd air conditioning. Thereby, in the heat exchanger 531 of the heat exchange unit 53 for the third air conditioning, heat exchange is performed between the low-temperature water supplied from the tank 60 and the air in the garden house 100. As a result, the air is cooled and its temperature is lowered, and is blown out into the garden house 100 by the fan 522 as indicated by an arrow C2. The controller 90A controls the flow rate of the low-temperature water supplied to the third air conditioning heat exchange unit 53 so that the temperature in the house detected by the room temperature sensor 81 approaches the target temperature shown in FIG. Adjust the flow rate of the air blown into the inside.

  The system 10A configured as described above also adjusts the temperature of the air in the garden house 100 to a value close to the target temperature by executing the heating mode, the heating supply mode, and the cooling supply mode. Photosynthesis can be promoted.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. Each element provided in each of the specific examples described above and its arrangement, material, condition, shape, size, and the like are not limited to those illustrated, but can be changed as appropriate.

  Embodiment mentioned above has shown the example which used the combustor 20 as a combustion part which burns a fuel and supplies a carbon dioxide. However, the scope of the present invention is not limited to this form. For example, a mode in which an engine that generates a driving force by burning fuel or a fuel cell that burns remaining fuel that has not been used for power generation is also included in the scope of the present invention.

  The embodiment described above shows an example in which heavy oil or kerosene is used as fuel to be fueled by the combustor 20. However, the scope of the present invention is not limited to this form. For example, a mode in which city gas or LP gas is used as fuel instead of heavy oil or kerosene is also included in the scope of the present invention.

  The above-described embodiment shows an example in which water is used as the heat medium. However, the scope of the present invention is not limited to this form. For example, a form using an antifreeze as a heat medium instead of water is also included in the scope of the present invention.

  The first embodiment described above shows an example in which fuel gas is directly supplied from the combustor 20 into the horticultural house 100 when the cooling supply mode is executed, as indicated by an arrow G2 in FIG. However, the scope of the present invention is not limited to this form. For example, a form in which the combustion gas generated in the combustor 20 is passed through the heat exchanger 521 of the heat exchange unit 52 and then supplied into the garden house 100 when the cooling supply mode is executed is also included in the scope of the present invention. The

10, 10A: Carbon dioxide supply system 20: Combustor (combustion section)
30: Endothermic heat exchanger (endothermic heat exchanger)
40, 40A: Circulation flow path 46: Switching valve 51: Heat exchange unit for first air conditioning 52: Heat exchange unit for second air conditioning 53: Heat exchange unit for third air conditioning 60: Tank (storage unit)
81: Room temperature sensor (house temperature detector)
82: Water temperature sensor (heat medium temperature detector)
90, 90A: Control unit 100: Horticultural house

Claims (8)

A carbon dioxide supply system (10) for supplying carbon dioxide into a horticultural house,
A combustion section (20) for burning fuel and supplying combustion gas into the horticultural house;
An endothermic heat exchange section (30) for exchanging heat between the combustion gas and the heat medium to absorb heat to the heat medium;
A circulation flow path (40) for circulating a heat medium through the heat-absorbing heat exchange section;
A first air conditioning heat exchange section (51) that is provided in the circulation flow path downstream of the heat absorption heat exchange section, and performs heat exchange between the heat medium and the air in the garden house;
Provided in the circulation flow path downstream of the first air conditioning heat exchange section, stores the heat medium supplied from the upstream side, and stores the heat medium as the heat medium flows in. A storage section (60) for causing the heat medium flowing out to flow downstream;
A second air conditioning heat exchange section (52) provided in the circulation flow path downstream of the storage section, and performing heat exchange between the heat medium and the air in the garden house;
A control section (90) for controlling the combustion section, the first air conditioning heat exchange section and the second air conditioning heat exchange section,
The controller is
A heating mode for heating the air in the horticultural house by operating at least one of the first air conditioning heat exchange unit and the second air conditioning heat exchange unit without operating the combustion unit,
A heating supply mode for supplying carbon dioxide while heating the air in the horticultural house by operating the combustion section and the first air conditioning heat exchange section without operating the second air conditioning heat exchange section. When,
A cooling supply mode for supplying carbon dioxide while cooling the air in the horticultural house by operating the combustion section and the second air conditioning heat exchange section without operating the first air conditioning heat exchange section. And, perform the carbon dioxide supply system. A house temperature detector (81) for detecting the temperature of the air in the garden house,
The controller executes the heating supply mode when the temperature of the air in the garden house is lower than a preset threshold value, while the temperature of the air in the garden house is higher than the threshold value. The carbon dioxide supply system according to claim 1, wherein the cooling supply mode is executed.   The carbon dioxide supply system according to claim 2, wherein the threshold value is set to change with time. A heat medium temperature detection unit (82) for detecting the temperature of the heat medium supplied to the second air conditioning heat exchange unit;
The said control part prohibits execution of the said cooling supply mode, when the temperature detected by the said heat medium temperature detection part is higher than the temperature detected by the said house temperature detection part. Carbon dioxide supply system. A carbon dioxide supply system (10A) for supplying carbon dioxide into a horticultural house,
A combustion section (20) for burning fuel and supplying combustion gas into the horticultural house;
An endothermic heat exchange section (30) for exchanging heat between the combustion gas and the heat medium to absorb heat to the heat medium;
A circulation flow path (40A) for circulating a heat medium through the heat-absorbing heat exchange section;
Provided in the circulation flow path downstream of the heat absorption heat exchange section, stores the heat medium supplied from the upstream side, and stores the heat medium as the heat medium flows in. A reservoir (60) for causing the heat medium that is flowing out to flow downstream;
A third air-conditioning heat exchange section (53) provided in the circulation flow path and performing heat exchange between the heat medium and the air in the garden house;
A switching valve (46) for switching the circulation flow path, supplying a heat medium supplied from the heat-absorbing heat exchange unit to the storage unit, and converting the heat medium flowing out from the storage unit to the third air conditioning heat A first circulation state to be supplied to the exchange unit, and a second circulation state to be supplied to the third air conditioning heat exchange unit without supplying the heat medium supplied from the heat absorption heat exchange unit to the storage unit, The switching valve for switching; and
A control unit (90A) for controlling the combustion unit, the third air conditioning heat exchange unit and the switching valve;
The controller is
A heating mode for heating the air in the horticultural house by operating the third air conditioning heat exchange unit without operating the combustion unit, with the circulation channel in the first circulation state,
By setting the circulation flow path to the second circulation state and operating the combustion section and the third air conditioning heat exchange section, the third air conditioning heat exchange section heats the air in the horticultural house and emits carbon dioxide. A heating supply mode for supplying carbon;
By setting the switching valve to the first circulation state and operating the combustion unit and the third air conditioning heat exchange unit, carbon dioxide while cooling the air in the horticultural house in the third air conditioning heat exchange unit Supplying a cooling supply mode, and performing a carbon dioxide supply system. A house temperature detector (81) for detecting the temperature of the air in the garden house,
The controller executes the heating supply mode when the temperature of the air in the garden house is lower than a preset threshold value, while the temperature of the air in the garden house is higher than the threshold value. The carbon dioxide supply system according to claim 5, wherein the cooling supply mode is executed.   The carbon dioxide supply system according to claim 6, wherein the threshold value is set to change with time. A heat medium temperature detection unit (82) for detecting the temperature of the heat medium supplied to the third air conditioning heat exchange unit;
The said control part prohibits execution of the said cooling supply mode, when the temperature detected by the said heat-medium temperature detection part is higher than the temperature detected by the said house temperature detection part. Carbon dioxide supply system.

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