JPS59158941A - Solar heat air conditioning device - Google Patents

Abstract

PURPOSE:To utilize the solar heat to the utmost by a method wherein heating is performed by directly flowing the heat transfer medium heated at a solar heat collector into an indoor heat exchanger when enough insolution is possible and performed by means of a heat pump by sucking up the heat from the heat transfer medium at the evaporator of an absorption type heat pump when enough insolution is not possible. CONSTITUTION:When insolation is enough strong, the heat transfer medium sent by a pump 2 is heated at a solar kheat collector 1 up to about 120 deg.C and past through the side represented with a dashed line of a three-way valve 29 in order to heat the air in a room with an indoor heat exchanger 18. The heat transfer medium spent for heat radiation is returned through the side represented with a dashed line of a three-way valve 28 back to the pump 2 again. Because the sides represented with a solid line of the three-way valves 28 and 29 are open and yet a solenoid valve 37 is open and a solenoid valve 38 is closed when the insolation turns to be not enough strong, the heat transfer medium is heated at the solar heat collector 1 and sent via the side represented with a solid line of the three-way valve 29 through the solenoid valve 37 in order to give the heat to refrigerant at an auxiliary evaporator 36 and then past through the side represented with a solid line of the three-way valve 28 and finally returned to the pump 2. In other words, an absorption type heat pump having solar heat as its heat source is established. Under the conditions of no insolution at all, the pump 2 comes to the standstill, resulting in operating simply an absorption type heat pump having air as its heat source.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a solar heating and cooling system, and particularly relates to an absorption type heat pump using a heat medium heat source (solar heat collecting heat source) suitable for improving the solar heat dependence ratio. [Prior Art] Conventional solar systems provide heating when there is insufficient solar radiation by reheating the heating medium using an auxiliary boiler and by flowing the heating medium through an indoor fan coil unit. In addition, when there was a complete lack of solar radiation, heating was simply performed by a boiler, which had the disadvantage that solar heat could not be fully utilized.

[Purpose of the invention]

The object of the present invention is to provide a solar system that makes use of solar collectors as effectively as possible, in other words, makes maximum use of solar heat.

[Summary of the invention]

In a system in which an air heat source absorption heat pump is operated by solar heat, when there is sufficient solar radiation, the heat medium heated by the solar collector flows directly into the indoor heat exchanger for heating, and when there is insufficient sunlight, the heat medium is absorbed from the heat medium. It is characterized by pumping up heat using the evaporator of a type heat pump to provide heat pump heating, and when there is no solar radiation, heating is performed by operating an absorption type heat pump using an air heat source.

[Example of invention]

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

First, when cooling using solar heat, the process is as follows. That is, the solar heat collected by the solar collector 1 is transferred to the three-way valve 29.
The refrigerant is generated by the generator 3 through the solenoid valve 38 along the solid line side. When the amount of heat is insufficient, the burner of the generator 3 is proportionally controlled to provide additional heat.

The refrigerant gas generated here passes through the solenoid valve 32 and passes through the outdoor heat exchanger (
2) At step 27, it is cooled by the outside air and becomes a liquid refrigerant. This liquid refrigerant passes through the electromagnetic valve 22, is supercooled by the subcooler 14, and is depressurized by the expansion valve 24. A part of the refrigerant boiled at low pressure passes through the reverse valve 25 and cools the air in the indoor heat exchanger (2) and 17.
It merges with the previous gas refrigerant. This cold gas refrigerant cools the liquid refrigerant in the supercooler 14, and it turns into superheated gas and goes to the mixing point 39. On the other hand, the dilute liquid that has finished generating refrigerant gas in the generator 3 passes through the dilute liquid line 40, is depressurized by the pressure reducing valve 11, and merges with the previous gas refrigerant at the mixing point 39. This mixed liquid is in a two-phase high-temperature state and increases the amount of heat dissipation liquid in the absorption heat exchanger 9, passes through the check valve 8, and is cooled by the outside air in the outdoor heat exchanger 26 to become completely only liquid. This concentrated liquid is passed through the solenoid valve 19 to the tank 12.
Once the water is stored, the pump 10 is used again to generate the generator 3.
sent to.

Next, let's talk about heating. First, when the solar radiation is strong enough, the heat medium sent by the pump 2 is heated by the solar collector 1,
When the temperature reaches about 120°C, the indoor heat exchanger (3) 91 passes through the broken line side of the three-way valve 29 and heats the air in the room. The heating medium that has finished dissipating heat passes through the broken line side of the three-way valve 28 and returns to the pump. At this time, the absorption type main body does not operate at all, and the indoor heat exchanger <1) (2
)(3) Only fans for 15.17.18 will be operated. Next, when the solar radiation is insufficient and the heating capacity is insufficient even if it is passed through the indoor heat exchanger (3) and +8, the three-way valves 28 and 29 are opened on the solid line side, the solenoid valve 37 is opened, and the solenoid valve 38 is closed. As a result, the heat medium is heated in the heat collector 1 (even if the heat medium temperature is low and the solar radiation is weak, the heat collection efficiency is high and the heat can be collected sufficiently), and the solenoid valve 37 is passed through the solid line side of the three-way valve 29. Then, heat is applied to the refrigerant in the auxiliary evaporator 36 (this is an evaporator, so the liquid refrigerant is gasified) and returns to the pump 2 through the solid line side of the three-way valve 28. At this time, the absorption cycle becomes a gas-fired D heat pump. That is, the generator 3 generates a force of 1 by burning city gas.
It is heated and gas refrigerant is generated, which heats the air in the room through the indoor heat exchanger (2) and 17 through the solenoid valve 31, and liquefies itself. This liquid refrigerant is depressurized by the expansion valve 35, passes through the electromagnetic valve 33 to be boiled at low pressure, and is vaporized in the fibrillation evaporator 36. That is, it is a solar heat source. This gasified refrigerant passes through electromagnetic valves 30 and 6 and reaches a mixing point.

On the other hand, the mixed liquid (dilute liquid) of refrigerant and bath mix that has finished generating refrigerant in the generator 3 radiates heat in the liquid heat exchanger 4, passes through the dilute liquid lie/40, depressurizes in the low pressure valve 11, and then returns to the mixing point. gas refrigerant. This high-temperature two-phase mixed liquid passes through the check valve 13 and heats the air in the room through the indoor heat exchanger (1) (15). After complete absorption, it becomes a single-phase concentrated liquid that passes through the check valve 23 and then flows through the solenoid valve 2.
0 is passed through and stored in tank 12. This concentrated liquid is sent to the generator 3 again by the pump 10. As mentioned above, when there is not enough sunlight, solar heat source (thermal heat source)
This is an absorption heat pump. Next, when there is no solar radiation, it operates as if it were dark. That is, the pump 2 is stopped and the absorption heat pump is simply operated, providing only the air heat source. The flow of liquid in the refrigeration cycle is the same except for one point. 51J'9. 'ill.

Magnetic valves 30 and 33 are closed, 21 is open, and 22 is closed.

As a result, the two-phase refrigerant that is boiling at low pressure is removed by the check valve 3.
4 through the outdoor heat exchanger (2), 27, solenoid valve 21, outdoor heat exchanger (1), 26 through 9, at which time heat is obtained from the outside air and vaporized. Go to the mixing point as before. Other refrigeration cycle operations are the same.

〔Effect of the invention〕

According to the present invention, heat pump heating using solar heat as a heat source can be performed economically without reheating the boiler for heating when solar radiation is insufficient. Moreover, if the heat source temperature is 20°C or higher, the COP of the heat pump is very good, and the heat collection efficiency of the heat collector is almost 1 at this low temperature, so even if the solar radiation is very weak, it can collect heat sufficiently. This is effective in making full use of solar collectors and increasing the utilization rate of solar heat.

[Brief explanation of drawings]

The figure shows the system flow of the present invention. 1...Solar heat exchanger 2...Collector pump 28゜29...Three-way valve 18...Inner heat exchanger 3 36...
・Auxiliary evaporator 37.38...Solenoid valve

Claims (1)

[Claims] In a solar heating and cooling system that operates an air-source absorption heat pump using solar heat, there is a method for heating by directly sending the heat medium heated by a solar collector to an indoor heat exchanger when there is insufficient solar radiation, and a method for heating when there is insufficient solar radiation. The solar heating system is characterized by having a means for pump heating by pumping up heat from a heat medium with an evaporator of an absorption heat pump, and a means for heating by operating an absorption heat pump using an air heat source when there is no sunlight. Air conditioning equipment.