JPS58124138A - Controlling method of driving auxiliary heat source in regenerative air conditioner - Google Patents

Abstract

PURPOSE:To secure stable heating operation by a method wherein the air conditioner consists of two cycles or a refrigerating cycle and a heat transfer medium cycle and the auxiliary heat source to heat cold-heat accumulating material is put into operation when the temperature of said material is below a predetermined value. CONSTITUTION:A compressor 1 is connected in series to a four-way switching valve 2, an indoor side heat exchanger 3, a solenoid valve 4 to control refrigerant flow, a pressure reducing mechanism 5, an outdoor side heat exchanger 6 and again the four-way switching valve 2 and back to the compressor 1 and in addition a by-pass circuit 7 equipped with a solenoid valve 8 and a pressure reducing mechanism 9 to by-pass the solenoid valve 4 and the pressure reducing mechanism 5 is connected between the indoor side heat exchanger 3 and the outdoor side heat exchanger 6. A cold-heat accumulator 10 to accumulate the cold-heat produced in refrigerating cycle is equipped with an auxiliary heat exchanger 12 to heat-exchange with the outdoor side heat exchanger 6. Accordingly, during the recovery operation of heat accumulated for heating and defrosting operation, when the temperature of the cold-heat accumulating material 10a in the cold-heat accumulator 10 is below a certain set value, the auxiliary heat source 14 is put into operation so as to secure the quantity of heat in the cold-heat accumulator 10, resulting in enabling to continue the stable operation and to secure the capacity during the heating operation.

Description

[Detailed description of the invention] The present invention has a cold storage heat tank in the refrigeration cycle.

and relates to operation control of an auxiliary heat source when performing heating cold storage heat recovery operation or defrosting operation of a regenerative air conditioner having a heat medium circuit for recovering cold storage heat stored in the cold storage heat tank in a refrigeration cycle. In particular, when the outdoor air temperature is lower than a certain set value and the temperature of the cold storage material in the cold storage tank is lower than a certain set value, the cold storage material is used to secure the necessary amount of heat. The purpose of this system is to operate an auxiliary heat source that heats the air, thereby ensuring stable heating operation and heating capacity.

During heating heat storage recovery operation and frost operation in conventional regenerative air conditioners, if the load on the indoor side or the load on the outdoor side is large, there is no room to store the heat in the refrigeration cycle in the cold storage heat tank, so the cold storage heat is The heat stored in the tank cannot be used for the heating heat storage recovery operation and the defrosting operation, and the disadvantage is that stable heating operation cannot be continued.

The present invention is intended to eliminate the above-mentioned conventional drawbacks.

Hereinafter, the present invention will be described with reference to the accompanying drawings showing one embodiment thereof.

The refrigeration cycle will now be explained with reference to FIG.

In the figure, 1 is a compressor and 2 is a four-way switching valve.

3 is an indoor heat exchanger, 4 is a solenoid valve that controls the flow of refrigerant, 6 is a pressure reducing mechanism, 6 is an outdoor heat exchanger, 7 is a bypass circuit for bypassing the solenoid valve 4 and the pressure reducing mechanism 6. It is equipped with a solenoid valve 8 and a pressure reducing mechanism 9. Reference numeral 10 denotes a cold storage heat storage tank for storing cold heat during the refrigeration cycle, in which refrigerant pipes are arranged in a meandering or spiral shape, and the surrounding area is filled with a cold storage heat storage material 10a made of water mixed with antifreeze, for example. ing. Reference numeral 11 denotes a heat medium circuit, a part of which passes through the inside of the cold storage heat tank 1° in order to recover the cold storage heat stored in the cold storage heat tank 10, and for exchanging heat with the outdoor heat exchanger 6. It is equipped with an auxiliary heat exchanger 12. This side heat exchanger t
, 12 may have a structure in which heat radiating fins are shared or both heat exchangers are used. 13 is a circulation pump for circulating the heat medium in the heat medium circuit 11. 14 is an auxiliary heat source for heating the cold storage heat material 10a in the cold storage heat tank 10. In Figure 1, M indicates an indoor unit and B indicates an outdoor unit.

FIG. 2 shows the operation of the electromagnetic valves 4 and 8 and the circulation pump 13, which control the flow of refrigerant in the refrigeration cycle, for each operation.

In the above configuration, during normal cooling operation, each electromagnetic valve 4.8 and circulation pump 13 are controlled as shown in A1 of FIG. 2. As a result, the refrigerant discharged from the compressor 1 is transferred to the four-way switching valve 2, the outdoor heat exchanger 6. Decompression mechanism 6. Solenoid valve 4
, an indoor heat exchanger, a refrigeration cycle that passes through a 3° four-way switching valve 2 and returns to the compressor 1.

Also, during cooling cold storage heat operation, each solenoid valve 4, 8. Circulation pump 1
3 is controlled as shown in Figure 2, Tomb 2.
0 is operated as an evaporator. That is, the refrigerant discharged from the compressor 1 passes through the four-way switching valve 6 vane 2, the outdoor heat exchanger θ, and the bypass circuit 7, is depressurized by the pressure reducing mechanism 9, and is evaporated in the cold storage heat tank 10 and the indoor heat exchanger 3. At the same time as cooling the indoor side, the cold storage material 10a in the cold storage tank 1o is cooled to store cold energy. The refrigerant that exits the cold storage heat tank 10 is passed through the solenoid valve 8° and the indoor heat exchanger 3. It constitutes a refrigeration cycle that passes through the four-way switching valve 2 and returns to the compressor 1.

Furthermore, during the cooling cold storage heat recovery operation, each solenoid valve 4, 8° circulation pump 13 is controlled as shown in A3 in FIG. Heat exchange is performed with the heat exchanger 12. In other words, compressor 1
The refrigerant discharged from the four-way switching valve 2 and the outdoor heat exchanger 6
The heat of condensation is taken away by the outdoor air and the cold storage heat stored in the cold storage heat tank 10, and the condensation occurs. The refrigerant that has exited the outdoor heat exchanger 6 is transferred to a pressure reducing mechanism 6. Solenoid valve 4, indoor heat exchanger 3. It constitutes a refrigeration cycle that passes through the four-way switching valve 2 and returns to the compressor 1. On the other hand, the movement of the heat medium in the heat medium circuit 11 transfers the cold storage heat stored in the cold storage heat tank 10 to the heat medium circuit 11.
1 and circulated to the auxiliary heat exchanger 12 by the circulation pumps 61 and 13, where heat exchange is performed between the auxiliary heat exchanger 12 and the outdoor heat exchanger 6. And the heating medium that has completed the heat exchange.

This constitutes a cycle of passing through the heat medium circuit 11 again and returning to the cold storage heat tank 10.

Also, during normal heating operation, each solenoid valve 4.8. Circulation pump 13
The control is performed as shown in Fig. 2, box 4, and the refrigerant discharged from the compressor 1 is passed through the four-way switching valve 2, the indoor heat exchanger 3.
Electric heat 4. Pressure reduction mechanism 5, outdoor heat exchanger 6. It constitutes a refrigeration cycle that passes through the four-way switching valve 2 and returns to the compressor 1.

Furthermore, during heating heat storage operation, each solenoid valve 4, 8, circulation pump 1
3 is controlled as shown in black 5 in Fig. 2, and the cold storage heat tank 1
0 is operated as a condenser. Toe 9. The refrigerant discharged from the compressor 1 is passed through a four-way switching valve 2, an indoor heat exchanger 3. Bypass circuit 7. It passes through the electromagnetic valve 8 and enters the cold storage heat tank 10, and is condensed in the indoor heat exchanger 3 and the cold storage heat tank 1o, heating the indoor area, and at the same time exchanges heat with the cold storage heat material 10a in the cold storage heat tank 1o to release heat. It is stored in the cold storage heat material 10i1. The refrigerant leaving the cold storage heat tank 1o passes through the pressure reducing mechanism 9, the outdoor heat exchanger 6° and the four-way switching valve, and returns to the compressor 1, forming a refrigeration cycle.

Also, during heating heat storage recovery operation, each solenoid valve 4, 8. The circulation pump 13 is controlled as shown in FIG. In other words, the refrigerant discharged from the compressor 1 is transferred to the four-way switching valve 2. Solenoid valve 4, pressure reducing mechanism 6
, passes through the outdoor heat exchanger 6, removes evaporation heat by the outdoor air and the heat stored in the cold storage heat tank 10, and evaporates.

The refrigerant leaving the outdoor heat exchanger 6 passes through the four-way switching valve 2 and returns to the compressor 1, forming a refrigeration cycle. On the other hand, the movement of the heat medium in the heat medium circuit 11 is as follows.

The heat stored in the cold storage heat tank 10 is recovered into the heat medium circuit 11 and circulated to the auxiliary heat exchanger 12 by the circulation pump 13, and heat exchange is performed between the auxiliary heat exchanger 12 and the outdoor heat exchanger 6. Let them do it. After completing the heat exchange, the heat medium passes through the heat medium circuit 11 again and returns to the cold storage heat tank 10, forming a cycle.

If the temperature of the cold storage heat material 1Qa in the cold storage heat tank 10 is below a certain set value, the auxiliary heat source 14 is operated to store a sufficient amount of heat in the cold storage heat material 10a, and control is performed so that the heating operation can be continued. . As this temperature detection means, as is well known, a temperature detector such as a thermistor may be appropriately attached.

During the defrosting operation when frost formation on the outdoor heat exchanger 6 is detected by a well-known means, the solenoid valves 4 and 8 and the circulation pump 13 are controlled as shown in A7 of FIG. In this case, the circulation of the refrigerant and the circulation of the heat medium are the same as in the heating heat storage and recovery operation. Furthermore, the control when the temperature of the cold heat storage material 10a in the cold storage heat storage tank 1o is below a certain set value is also the same as the heating heat storage recovery operation.

Therefore, during heating heat storage recovery operation and defrosting operation, if the temperature of the cold heat storage material 10a in the cold heat storage tank 1o is below a certain set value, the auxiliary heat source 14 is operated to
It secures the amount of heat within 9 degrees, and allows stable operation and capacity during heating operation.

As is clear from the above embodiments, the auxiliary heat source operation control method for a regenerative air conditioner according to the present invention includes a compressor, a four-way switching valve, an indoor heat exchanger, and a pressure reducing mechanism.

A refrigeration cycle equipped with an outdoor heat exchanger and connected to a bypass circuit for performing cold storage heat operation, a cold storage heat tank containing a cold storage heat material, a pressure reduction mechanism, and a solenoid valve for controlling the flow of refrigerant; Consisting of two cycles: a heat medium cycle each connected with a heat medium circuit, an auxiliary heat exchanger, and a circulation pump for recovering the cold storage heat stored in the cold storage heat tank by the cold storage heat operation into the refrigeration cycle, When performing heating heat storage recovery operation or defrosting operation using the above two cycles, if the outside air temperature is below a certain set value and the temperature of the cold storage heat material in the cold storage heat tank is below a certain set value, cold storage will start. This device operates an auxiliary heat source that heats the cold storage material in the heat tank to raise the temperature of the cold storage material above the set value.1 Not only can it perform normal cooling and heating, but it also has excess cooling capacity. , the heating capacity can be stored in the cold storage tank (1), and the stored capacity can be used for cooling, cooling, etc. as needed.
Since it can be used for heating, it is economical because there is less wastage of capacity.Furthermore, since the cold storage material is kept at the set temperature by an auxiliary heat source, the capacity is particularly low during heat recovery and during defrosting operation during heating, when the capacity tends to decrease. This ensures that stable operation continues.

It has various advantages.

[Brief explanation of drawings]

Fig. 1 is a refrigeration cycle diagram in which the auxiliary heat source operation control method for a regenerative air conditioner of the present invention is implemented, and Fig. 2 shows the heat of the electromagnetic valve and heat medium circuit that control the flow of refrigerant in the regenerative air conditioner. FIG. 2 is an operation diagram showing the operation of a circulation pump that circulates a medium. 1... Compressor, 2... Four-way switching valve, 3
...Indoor heat exchanger, 4...Solenoid valve,
5... Pressure reduction mechanism, 6... Outdoor heat exchanger, 7... Bypass circuit, 8... Solenoid valve, 9... Decompression mechanism, 10..., cold storage heat tank. 10 a... Cold storage heat material 11... Heat medium circuit, 12... Auxiliary heat exchanger, 13...
・Circulation pump, 14...Auxiliary heat source. Figure 1B Ward 11 ---,,,-J Figure 2

Claims (1)

[Claims of Claims] A cold storage heat system that is equipped with a compressor, a four-way switching valve, an indoor heat exchanger, a pressure reduction mechanism, and an outdoor heat exchanger, and also includes a bypass circuit for performing cold storage heat operation, and a cold storage heat material sealed therein. A refrigeration cycle in which a tank, a pressure reduction mechanism, and an electromagnetic valve for controlling the flow of refrigerant are connected to each other, and a heat medium circuit for recovering the cold storage heat stored in the cold storage heat tank by the cold storage heat operation into the refrigeration cycle. When the heating medium cycle is configured with two cycles, each of which is connected to an auxiliary heat exchanger and a circulation pump, and a heating heat storage recovery operation or a defrosting operation is performed using the two cycles, when the outside air temperature is below a certain set value, And if the temperature of the cold heat storage material in the cold heat storage tank is below a certain set value, an auxiliary heat source for heating the cold heat storage material in the cold heat storage tank is operated to raise the temperature of the cold heat storage material above the set value. A method for controlling the operation of an auxiliary heat source for a regenerative air conditioner. 2,,-.