JPS6015854B2 - Solar heat collection control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat collection control device for a solar air conditioning system that collects and stores solar heat through a heat medium and supplies heat to an air conditioning system or a hot water supply system, and controls the heat collection operation. The purpose of this is to efficiently collect heat by changing the detection position of the temperature difference thermometer depending on the season.

In general, a solar heat collection device that circulates heat medium through a solar heat collector using a pump and stores heat in a basket heat sink that supplies heat to air-conditioning equipment or water heaters.Thermometer and heat storage device that detects the temperature of the heat medium in the solar heat collector. It is already known to control the operation of a circulation pump based on a temperature difference signal from a thermometer that detects the temperature of a tank.

However, in a solar heating and cooling system that performs air conditioning and hot water supply using solar heat, when it has a heat storage tank that supplies heat to the air conditioning system and a heat storage tank that supplies heat to the hot water supply system, the temperature of the heat medium of the solar collector and the temperature of the heat storage tank If the operation of the circulation pump is controlled based on the difference in temperature between the heat medium and the heat medium, there is a drawback that the heat collection efficiency decreases depending on the season. The present invention eliminates such drawbacks, and embodiments thereof will be described below with reference to the accompanying drawings.

In FIG. 1, a solar heat collector 1 absorbs solar heat by circulating a heat medium, and the heated heat medium is pumped to the upper part of a heat storage device 2 for heating and cooling.

The heating and cooling heat storage device 2 is filled with a heat medium, and a heat collection pump (heat medium circulation means) 3 supplies the solar heat collector from the bottom of the heat storage device 2 via a heat exchanger 5 inside the heat storage device 4. 1, and the heat medium circulates through the solar heat collector 1, the heat storage device 2, and the heat exchanger 5 in this order. City water is supplied to the heat storage device 4 from a water supply pipe 6 connected to the lower part, and the water is mixed by the water supply pipe 7 at the upper part. Reference numeral 8 denotes a heating and cooling device, in which a heat medium is pumped from the upper part of the heat storage device 2 for cooling and heating by a heat supply pump 9, and is returned to the lower part of the heat storage device 2 for heating and cooling.

Reference numerals 10, 11, and 12 are a first temperature detector, a second temperature detector, and a third temperature detector for detecting the heat medium temperature, and the first temperature detector 1 is located near the outlet side of the solar heat collector 1. provided,
The second temperature detector 11 is provided near the pipe that flows out to the heat exchanger 5 at the bottom of the cooling/heating heat storage device 2, and the third temperature sensor 12 is provided in the heat exchanger 5 of the supply/failure heat storage device 4. ing.

These three temperature detectors 10, 1112 are based on the first temperature detector 10, and the temperature difference signal between the signal of the first temperature detector 10 and the signal of the second temperature detector 11 and the first temperature detector 10 are
The heat collection controller 13 calculates the temperature difference signal between the signal and the signal from the third temperature detector 12, and as a result, the operation of the heat collection pump 3 is controlled. One of these two temperature difference signals can be selected depending on the usage status of the air-conditioning device 8, as will be described later. In the case of either temperature difference signal, if the temperature difference is greater than or equal to the set value, heat collection is possible and the heat collection pump 3
is operated, and if the value is below the set value, the heat collection pump 3 is stopped. 14, 15, and 16 are heat collection pipes, respectively;
17 and 18 are air conditioning pipes.

FIG. 2 shows a heat collection control circuit, and SW is an operation changeover switch that opens and closes the air-conditioning operation control device 4 of the air-conditioning device 8 including the heat supply pump 9 and the temperature difference switching recoil R-.

The AC power source is converted into a low-voltage DC power source by a transformer T and a rectifier bridge D, and then supplied to a temperature difference detection bridge B. Thermistors R, , R2, and R3 of bridge B are the first
These are the resistances of the temperature detector 10, the second temperature detector 11, and the third temperature detector 12, and R4 and R5 are fixed resistances, respectively. RL(S) is a temperature difference switching relay contact (switching means) that switches the thermistors R and R2 by excitation of the temperature difference switching IJ Ray coil RL2. The output of bridge B is sent to comparator C, which detects the level of the temperature difference signal, and energizes heat collecting pump relay coil RL if the temperature difference signal is greater than a set value. PM is heat collection pump 3
In the motor, RL(S) is a heat collecting pump relay contact, and the contact is closed by excitation of the heat collecting pump relay coil. Next, the operating state will be described. FIG. 2 shows the state in which the air conditioning system 8 is operated in summer or winter, with the operation changeover switch SW being closed and the air conditioning operation control system A being energized and the differential temperature switching IJ Ray coil RL2 being energized. The temperature difference switching relay contact RL (S) is switched to the thermistor R2 side. As a result, bridge B is thermistor R,
An output is generated according to the temperature difference signal between R2 and R2. In other words, the temperatures of the first temperature detector 10 and the second temperature detector 11 are compared, and the heat storage in the cooling/heating heat storage device 2 becomes the control target. If there is sufficient solar radiation from the sun, the first temperature detector 10 is heated by the heat medium of the solar heat collector 1, and the resistance of the thermistor R decreases, so an unbalanced voltage is generated in the bridge B, which is amplified by the coparator C. to energize the heat collecting pump relay coil RL, and heat collecting pump relay contact RL, (S
) is closed and power is supplied to the heat collection pump motor PM.
As shown in FIG. 1, when the heat collection pump 3 is operated, the heat medium circulates in the solar heat collector 1, and the heated heat medium flows into the upper part of the heat storage device 2 for heating and cooling. The heat medium in the lower part flows into the heat exchanger 5, heats the city water for hot water supply, and is circulated to the solar heat collector 1. When this heat collecting operation is continued, the heated heat medium is stored in the upper part of the heating and cooling heat storage device 2, and by driving the heat supply V supply pump 9, heating and cooling operation becomes possible. When the solar radiation becomes insufficient, the temperature of the heat medium in the solar heat collector 1 does not rise and the resistance of the thermistor R increases, the unbalanced voltage of the bridge B decreases, and the excitation current flows into the heat collector pump relay coil RL. does not flow, and the heat collector pump relay contacts RL and (S) open, stopping the supply of power to the heat collector pump motor PM. Therefore, the heat collection pump 3 is stopped, the circulation of the heat medium to the solar heat collector 1 is stopped, and the radiation of heat from the solar heat collector 1 is prevented. Next, a case in which the heating and cooling device 8 is not used, that is, the spring and autumn seasons will be described.

When heating and cooling is not performed, the heat medium in the heat storage device 2 for cooling and heating is not used directly, and the storage of heat in the heat storage device 4 for hot water supply becomes important. In this case, open the operation switch SW. When the operation changeover switch SW is opened, no current flows through the temperature difference switching relay coil RL2, and the temperature difference switching relay contact RL2 (S) is switched from the thermistor resistor R2 to R3. As a result, bridge B
generates an output in response to the temperature difference signal between thermistors R and R3. That is, the first temperature detector 10 and the third temperature detector 1
2, the temperature will be compared with the hot water supply heat storage device 14.
The heat storage in is the subject of control. The heat collection operation in this case is the same as described above. The operation changeover switch SW can also be provided in an operation control panel that centrally controls the solar hot water heating and cooling system, and the operation changeover switch SW may be composed of a multiple switch, and this switch may be used to switch between the thermistors R2 and R3. Further, the present invention is not limited to the solar hot water heating and cooling system of the embodiment, but can be widely applied as long as it has a heat storage device for air conditioning and a heat storage device for supply/failure. As described above, the present invention is provided with temperature detectors for detecting the heat medium temperature of each of the concentrator, cooling/heating heat storage device, and supply/failure heat storage device, and controls the operation of the heat collecting pump based on the differential temperature signals of these temperature detectors. By switching the temperature difference signal depending on the use or inconvenience of the air conditioning system, optimal nest heat control can be performed depending on the season, which increases the effective use of solar thermal energy and has high practical value. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the solar heat collection control device of the present invention, and FIG. 2 is an electrical control circuit diagram thereof.

1...Solar heat collector, 2...Heat storage device for heating and cooling, 3...Heat collection pump (thermal medium circulation means), 4...Heat storage for supply and damage Apparatus, 5... Heat exchanger, 8... Air conditioning device, 10... First
Temperature detector, 11... Second temperature detector, 12...
...Third temperature detector, 13... Heat collection controller,
14... Heat collection piping, SW... Operation selector switch (operation switch), RL2/RL2(S)...
...Differential temperature switching Ray coil/Differential temperature switching IJ Ray contact (switching means).

Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A solar heat collector, a heat medium circulation means for circulating a heat medium heated by the solar heat collector, and a heat medium circulating means that is heated and stored by the heat of the heat medium and supplies heat to an air-conditioning device. A heat storage device for heating and cooling; a heat storage device for hot water heating and storing heat by the heat of the heat medium; the heat collector; the heat storage device for heating and cooling;
a first temperature detector, a second temperature detector, and a third temperature detector that detect the respective heat medium temperatures of the hot water supply heat storage device;
The operation of the heat medium circulation means is controlled by either a temperature difference signal between the first temperature detector and the second temperature detector or a difference temperature signal between the first temperature detector and the third temperature detector. 1. A solar heat collection control device, comprising: a heat collection controller for controlling the temperature difference; and a switching means for selecting one of the temperature difference signals. 2. The solar heat collection control device according to claim 1, wherein the switching means is associated with an operation switch of an air-conditioning device. 3. The solar heat collection control device according to claim 1, wherein the first temperature detector is provided near the heat medium outlet of the heat collector. 4. The solar heat collection control device according to claim 1, wherein the second temperature detector is provided near the heat collection pipe that is supplied from the cooling/heating heat storage device to the heat collector. 5. The third temperature detector is provided in the lower part of the heat storage device for hot water supply.
The solar heat collection control device described. 6. The solar heat collection control device according to claim 1, wherein the cooling/heating heat storage device stores heat with a heat medium circulating in a heat collector, and the hot water supply heat storage device is provided with a heat exchanger through which the heat medium circulates. . 7. The solar heat collection control device according to claim 6, wherein the heat medium is supplied from the heat collector to the heat exchanger via the cooling/heating heat storage device. 8. The solar heat collection control device according to claim 6, wherein the third temperature detector is provided near the heat exchanger.