JPS5921960A - Air-conditioning hot-water supply heat pump refrigeration cycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating/cooling and hot water supply heat pump refrigeration cycle.

There are three types of conventional water heaters using a refrigeration cycle:

/ As shown in Figure 1, a water heater is used only and does not have cooling or heating functions. In the diagram, 1 is a compressor.

2 water heat exchangers, 3 an outdoor air heat exchanger, and 7 an expansion valve.

As shown in Figure 1, hot water is created using waste heat on the high pressure side during cooling operation, and 4 in the figure is an indoor air heat exchanger.

3 As shown in Figure 3, the system switches between the heating coil and the hot water coil, or between the condenser and hot water coil during cooling, and 5 in Figure 5 is a four-way valve.

Can produce hot water at the same time as cooling or heating.

Furthermore, there was a strong need for a refrigeration cycle that could also produce hot water using the same equipment.

The present invention was devised in view of the above circumstances, and its gist is as follows.

That is, the present invention is constructed with a compressor, an indoor/outdoor heat exchanger, a four-way valve, a refrigerant control expansion valve, a capillary tube, etc. This is a cooling/heating/hot water heat pump refrigeration cycle equipped with a water heat exchanger via a four-way valve or a three-way valve.

Next, an embodiment of the present invention will be described with reference to Figure ≠. In the figure, 5 is a first four-way valve, 6 is a second four-way valve, 8 is a check valve,
9 is an expansion valve, [0 is an accumulator, and ti is a bypass.

During cooling operation, the high-temperature refrigerant discharged from the compressor 1 passes through the second four-way valve 6, passes through the water heat exchanger 2, radiates heat to water outside the water heat exchange pipe, and then passes through the second four-way valve 6. It passes through the seventh four-way valve 5 and reaches the outdoor air heat exchanger 3.

Here, the refrigerant is further cooled, bypasses the expansion valve 9, passes through the check valve 8, and is squeezed by the capillary 7 (expansion valve) (
Similar to the heating circuit, an expansion valve or check valve circuit can also be used), the indoor air heat exchanger 4 evaporates and cools the rush j~), it passes through the first four-way valve 5 (passes through the accumulator 10), and the compressor Return to 1.

During heating operation → compressor 1 → second four-way valve 6 → water heat exchanger 2 (it is also possible to have a busy air heat exchanger 5 as shown in FIG. 5 before or after) → first four-way valve Valve 6 → First four-way valve 5 → Indoor air heat exchanger 4 → Capillary tube 7 (check valve) → Expansion valve 9 → Outdoor air heat exchanger 3 →
Basically, the flow is from the first four-way valve 5 to the congressor 1. Time to defrost heating! It is the same as the cooling circuit except that the water heat exchanger 2 is bypassed by the west valve 6 of the air conditioner.

In terms of the refrigeration cycle, hot water supply operation and hot water supply defrosting are no different from heating operation and heating defrosting. In addition, among the above contents, the opening and closing of the second four-way valve 6 is performed when, for example, the temperature T2 of the pipe between the discharge of the compressor 1 and the second four-way valve 6 is lower than around 60°C (or lower than the tank water temperature). In some cases, the refrigerant flows from the compressor 1 to the second four-way valve 6 to the first four-way valve 5, and the water in the water heat exchanger 2 is not cooled. Further, when the second four-way valve 6 bypasses the water heat exchanger 2, a bypass ii for drawing out the refrigerant and oil accumulated in the water heat exchanger Z may or may not be provided.

Furthermore, as shown in Fig. 5, a water heat exchanger (or water tank) 2 is installed.
In some cases, an auxiliary heat exchanger 15 is attached to the series. A multi-system having a plurality of indoor heat exchangers at the position of the father-distributed indoor heat exchanger 4 is also conceivable. Furthermore, a combination with a rotary compressor refrigeration cycle having (or not having) an injection circuit in place of a reciprocating compressor is also included within the scope of the present patent claim.

In addition, when using a second four-way valve (an example of using a three-way valve 12 instead of 7 is shown in Figure 2), in the figure 12 is a three-way valve, 13 is a check valve, and a 14-way water heat exchanger is used as a two-way valve. A circuit having the function of a three-way valve is also included in the range.

According to the present invention, the following effects are achieved.

The cooling cycle is such that the water temperature can rise to hot water both during cooling operation and during heating operation, and there are no inconveniences such as hot water not coming out during cooling or heating during hot water supply.

Since there is a water heat exchanger between the Yucompressor and the first four-way valve, by storing refrigerant for a short time during defrosting, the discharge temperature can be increased and the defrosting efficiency can be increased.

3 A water heat exchanger is added to the normal refrigeration cycle, which lowers the compression ratio and allows for highly efficient operation, making it possible to utilize waste heat.

Four-way and three-way valves work to prevent hot water from being cooled during defrosting or when the discharge temperature is low at startup, enabling efficient operation.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are explanatory diagrams of a conventional refrigeration cycle, and FIGS. 7 and 7 are explanatory diagrams showing each embodiment of the refrigeration cycle according to the present invention. 1. Compressor, 2. Water heat exchanger, 3. Outdoor air heat exchanger, 4. Indoor air heat exchanger. 5. 6... Four-way valve, 7... Expansion valve or capillary tube, 9... Expansion valve, 15... Auxiliary heat exchanger. Figure 4 9 Figure 5

Claims (1)

[Claims] Compressor discharge of a heat pump refrigeration cycle consisting of a compressor, an indoor/outdoor heat exchanger, a four-way valve (or a combination of three-way valves, two-way valves, etc. equivalent to a four-way valve), a refrigerant control expansion valve, or a capillary tube, etc. , four-way valve (or a combination of three-way valve, two-way valve, etc. equivalent to a four-way valve)
A cooling/heating/hot water heat pump refrigeration cycle in which a water heat exchanger is provided through a second four-way valve or three-way valve between the two.