JPH0364787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating and cooling system that combines a compression heat pump cycle with an absorption cycle that operates using solar heat, waste heat, or the like as a heat source.

Traditionally, air conditioning equipment that utilizes solar heat, etc.
Lithium bromide-water absorption refrigerators are well known, and they circulate a heat medium such as water through a solar collector to extract heat as sensible heat, and during the cooling season, this heat is transferred to an absorption refrigerator. This heat is supplied to the gas generator and used to evaporate the refrigerant for cooling, which requires heating hot water that is at least 10°C higher than the temperature required by the generator, which not only increases heat loss but also requires a hot water circulation pump. Additional auxiliary power is required.

One way to solve this problem is to use a fluorocarbon-based refrigerant as the refrigerant and directly collect solar heat as a generator for an absorption refrigerator, but since this alone is not sufficient, it is combined with a compression heat pump cycle and used for heating. There are some systems that use a compression heat pump to pump up the heat collected in a heat collector through water, etc. to heat the room.

However, with this method, heating is not possible when there is no heat source such as solar radiation, and if hot water is stored as a solution to this problem, a considerably large heat storage tank is required, which is uneconomical.

The present invention improves these drawbacks during cooling and heating, and enables efficient heating and cooling.

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

First, the operation during cooling will be explained. When there is a sufficient heat source such as solar radiation, a concentrated solution containing a large amount of refrigerant sent by the solution pump 3 passes through the solution heat exchanger 2 and enters the heat collector/gas generator 1 where it is heated and generates refrigerant gas. The solution becomes a dilute solution. The generated refrigerant gas passes through the passage 7, but since the valve 6 is closed during cooling, it enters the condenser 9 via the valve 8, where it radiates heat and becomes liquefied. The refrigerant liquefied in the condenser 9 is depressurized in the expansion valve 10 and becomes easily evaporated, and then absorbs heat in the heat exchanger 11 and evaporates. At this time, the indoor space etc. is cooled. The evaporated refrigerant enters the absorber 13 through the valve 12, exchanges heat with the concentrated solution from the generator 1 in the solution heat exchanger 2, and is absorbed by the dilute solution that returns to the absorber 13 through the throttle valve 4. The concentrated solution is sent again to the generator 1 by the solution pump 3, and the cycle is repeated. In addition, heat sources such as solar radiation are insufficient,
When sufficient cooling output cannot be obtained, the compressor 24 is operated and the indoor heat exchanger 23 assists the cooling output.
In this case, the refrigerant discharged from the compressor 24 passes through the four-way valve 28, is heat-radiated and condensed in the water-cooled heat exchanger 20 or the air-cooled heat exchanger 26, is depressurized in the expansion valve 22, and enters the indoor heat exchanger 23. . Heat exchanger 23
The refrigerant that enters the room absorbs heat and evaporates, cooling the indoor space. The refrigerant leaving the heat exchanger 23 enters the compressor 24 via the four-way valve 28 and repeats the cycle again. Furthermore, when no heat source is available, such as solar radiation, cooling is performed only with a compression refrigeration cycle. In this way, heat sources such as solar heat can be used effectively to provide efficient cooling operation that matches the cooling load.

Next, the operation during heating will be explained. When a sufficient heat source such as solar radiation is available, the concentrated solution is sent to the heat collector generator 1 via the solution heat exchanger 2 by the pump 3, where a refrigerant gas is generated and becomes a dilute solution, which passes through the heat exchanger 2. It flows into the absorber 13. On the other hand, generator 1
The refrigerant gas generated in
When opened, it enters the absorber 13 through passage 7 and valve 6, passage 5. In the absorber 13, the refrigerant gas and the dilute solution are mixed and dissolved to form a concentrated solution, and at this time, an amount of heat approximately equal to the amount of heat required to generate the refrigerant gas in the heat collecting generator 1 is released. At this time, cold water inlet 14
When more cooling water flows in, this water is heated in the absorber 13 and flows out from the outlet 15 as hot water. Here, when the compressor 24 in which the hot water obtained from the outlet 15 is flowed into the water-cooled heat exchanger 20 of the compression heat pump cycle by the pump 16 is operated, the heat released from the absorber 13 passes through the hot water.
It is pumped into the refrigerant vapor of the heat pump cycle. The refrigerant that has absorbed heat in the heat exchanger 20 is transferred to the four-way valve 28.
The heat enters the compressor 24, where it is pressurized and heated, and reaches the indoor heat exchanger 23. The high temperature refrigerant radiates heat and condenses in the heat exchanger 23 to perform heating. In this case, since high-temperature heat can be used as a heat source for the compression heat pump cycle, the temperature difference between the condenser and evaporator can be reduced (that is, the compression ratio can be reduced), resulting in extremely efficient heating.

In addition, when a heat source such as solar radiation is not available, the absorption type cycle side is stopped, and if there is hot water in a heat storage tank installed at the end of the heat medium pipes 17 and 18, heat is transferred from the heat exchanger 20. When hot water is not available, or when the outside temperature is high and it is more advantageous to use hot water, the outdoor air heat exchanger 26 pumps heat from the outside air and performs heating in the same manner as described above.

FIG. 2 shows an example in which a gas or oil combustion heat exchanger 29 is provided instead of the air-cooled heat exchanger 26. Figure 3 also shows an air-cooled heat exchanger 26 and a combustion heat exchanger 2.
This is an example that includes both of the above. In addition, the other
It has the same configuration as the figure.

As described above, the present invention combines an absorption heat pump cycle with a compression heat pump cycle, and by providing at least two heat exchangers that serve as evaporators during heating on the compression heat pump side, the present invention eliminates the need for conventional heat pumps. There is no need to equip the system with a large heat storage tank, and an appropriate operation mode can be selected depending on the hot water temperature and outside air temperature, allowing for energy-saving and comfortable air conditioning.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a heating and cooling system showing an embodiment of the present invention, and FIGS. 2 and 3 are partial block diagrams of different embodiments of the present invention. 1... Heat collection generator, 3... Solution pump, 11...
... Indoor heat exchanger, 13 ... Absorber, 16 ... Water pump, 20 ... Water-cooled heat exchanger, 23 ... Indoor heat exchanger, 24 ... Compressor, 26 ... Air heat exchanger,
29...Gas (oil) heat exchanger.

Claims (1)

[Claims] 1. An absorption heat pump cycle comprising at least a generator, a condenser, an evaporator, an absorber, and a pump, and a passage for bypass-controlling a series circuit of the condenser and the evaporator. , comprising a compression heat pump cycle having at least a compressor, a four-way valve, a condenser, a heat exchanger, an expansion valve, and an evaporator as components, and heat exchange between the absorber of the absorption heat pump cycle and the compression heat pump cycle. The devices are connected and combined using heat medium piping such as water,
A heating and cooling device characterized in that a heat medium pipe connected to a heat storage tank or the like is provided in the heat medium pipe, and a pump for controlling movement of the heat medium is provided in the heat medium pipe. 2. The heating and cooling device according to claim 1, characterized in that a heat exchanger is connected in parallel to the condenser.