JPS60200060A - Cold heat accumulation type air conditioner - 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 [Field of Application of the Invention] The present invention relates to air conditioning equipment using an air-cooled heat pump type chiller unit.

[Background of the invention]

The refrigeration cycle of a conventional cold storage heating and cooling system is shown in Figure 1. During nighttime cold storage operation in summer, the solenoid valves 12 and 13 are closed and the hot and cold water circulation pump (not shown) is stopped. Compressor 1 - Four-way valve 2 - Air side heat exchanger 3 - Check valve sleeve - Receiver 4 - Door 29 Ear strainer 5 - Solenoid valve 14 - Expansion valve 7 - Check valve 22
- Cold storage heat coil 9 - Water side heat exchanger 10 - Four-way valve 2 - Accumulator 11 - Compressor 1 cycle, and the air side heat exchanger is used as a condenser to make ice and store cold in the cold storage heat tank 9a. Next, during the summer daytime cooling operation, the solenoid valves 12 and 14
Close the , switch the expansion valve from cold storage 7 to cooling 6,
Operating in the same cycle as during cold storage, the ice in the cold storage heat tank 9a made the night before and the cold water cooled by the water side heat exchanger 10 are
Each circulation pump (not shown) is operated to cool the room. Next, in winter, close the solenoid valves 13 and 14, compressor 1 - four-way valve 2 - water side heat exchanger 10 - cold storage heat coil 9 - check valve 20 - liquid receiver 4 - dryer strainer 5
- Solenoid valve 12 - Heating expansion valve 8 - Check valve 21 - Air side heat exchanger 3 - Four-way valve 2 - Accumulator 11 - Compressor 1 cycle, the air side heat exchanger 3 is used as an evaporator, At night, the cold/hot water circulation pump is stopped and heat is stored in the food/cooling tank 9a with hot water. During the day, each circulation pump is operated,
Heating is performed using the hot water stored the night before and the hot water heated by the water side heat exchanger 10.

Although such a conventional cycle has a simple cycle structure, it has the following drawbacks.

(1) There is a risk that the water side heat exchanger may freeze and break during cooling at night in summer.To prevent this, the refrigerant temperature at the water side heat exchanger inlet must always be kept above 0℃, or the water side heat exchanger A manual cold/hot water circulation pump must be operated.

(2) Even during cooling operation, the refrigerant passes through the cold storage heat coil with a long passage length, so a large pressure loss occurs, the pressure drop on the low pressure side is large, and the performance and coefficient of performance are significantly reduced.

(3) Also, during cooling operation, if the evaporation temperature exceeds θ''CC, the ice made the night before will melt from the surface of the cold storage heat coil (inner surface of the ice), which will not only cause loss of cold storage heat but also damage the coil. There is also a fear that

[Purpose of the invention]

The present invention eliminates the risk of damage to the heat exchanger, and when cooling,
To provide a cold storage heat type air-conditioning device which has a high cooling/heating capacity and a high coefficient of performance by keeping pressure loss small during cold storage and lowering the high-pressure side pressure during heating.

[Summary of the invention]

Direct expansion ice making coils create ice with low thermal conductivity on the coil surface, so the heat transfer coefficient as an evaporator is small, and the heat transfer area is large (1) P #) 1.5 to 1° 8 m'), and accordingly, the refrigerant passage becomes long, 50 to 75 m per bus. Therefore, in order to prevent pressure loss from increasing when this coil is on the low pressure side, it is bypassed when unnecessary. However, when the coil is on the high pressure side, the specific volume of the refrigerant is small and the pressure loss is also small, so we used it in combination as a condenser to lower the condensing pressure and improve performance and power savings.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. In addition to the equipment of general air-cooled heat pump chiller units, such as compressors, four-way valves, air-side heat exchangers, liquid receivers, dryer strainers, cooling and heating expansion valves, water-side heat exchangers, and accumulators, cold storage It is composed of a cold storage thermal tank with a built-in heating coil, a cold storage expansion valve, a solenoid valve for circuit switching, a check valve, etc. During cold storage and cooling, the water side heat exchanger and cold storage thermal coil are connected in parallel, and when heating At times, these are arranged in series.

Next, these operations will be explained.

First, during summer night cold storage operation, solenoid valves 13, 15, and 17
and 18 are closed, and the compressor 1 - four-way valve 2 - air side heat exchanger 3 - check valve 19 - liquid receiver 4 - dryer strainer 5 -
Air side heat exchange in the cycle of solenoid valve 12 - same 14 - cold storage expansion valve 7 - check valve 22 - cold storage heat coil 9 - solenoid valve 16 - check valve 25 - four-way valve 2 - accumulator 11 - compressor 1 The container 3 is operated as a condenser, the cold and hot water circulation pump (not shown) is stopped, and ice is made and stored in the cold storage heat tank 9a.

Next, during the daytime cooling operation in summer, use the solenoid valve 14. +5. Close 16 and 18, compressor 1 - four-way valve 2 - air side heat exchanger 3
- Check valve 19 - Liquid receiver 4 - Dryer strainer 5 - Solenoid valve 12 - Same 13 - Expansion valve for cooling 6 - Check valve 24 - Water side heat exchanger 1〇 - Solenoid valve 17 - Check valve 26 - It is operated in a cycle of four-way valve 2 - accumulator 11 - compressor 1, and the circulation pumps (not shown) for the cold storage heat tank and the water side heat exchanger are operated, and the ice in the cold storage heat tank 9a that was made the night before and the water. The air conditioner is cooled by the cold water cooled by the side heat exchanger 10.

Next, in winter, solenoid valve 13.14. Close +6 and 17, compressor 1 - four-way valve 2 - solenoid valve 18 - check valve 27 - water side heat exchanger 10 - solenoid valve 15 - check valve 23 - cold storage heat coil 9 - check valve 20-Liquid receiver 4-Dryer strainer 5-
In the cycle of solenoid valve 12 - heating expansion valve 8 - check valve 21 - air side heat exchanger 3 - four-way valve 2 - accumulator 11 - compressor 1, the air side heat exchanger 3 is operated as an evaporator, and the air side heat exchanger 3 is operated as an evaporator at night. The cold/hot water circulation pump (not shown) is stopped and heat is stored in the cold/heat storage tank 9a with hot water. In addition, during the day, the circulation pumps (not shown) for the cold storage heat tank and the water side heat exchanger are operated, and both the cold storage heat coil 9 and the water side heat exchanger 10 are used as condensers to heat hot water and provide space heating. provide

〔Effect of the invention〕

According to the present invention, the cold storage heat coil and the water side heat exchanger are arranged in parallel during cold storage and cooling in the summer, and are arranged in series during the winter, so that the following effects are achieved.

Since the evaporation temperature is below 0'C, there is no need to worry about freezing damage even during ice making.

(2) During cooling, since refrigerant does not pass through the cold storage heat coil with a long passage length, there is no unnecessary pressure loss, and the low pressure side pressure is not lowered more than necessary, resulting in a high performance and coefficient of performance. Can drive.

(3) In addition, the ice does not melt from inside during cooling, there is no loss of stored cold heat, and there is no damage to the coil due to melting inside the water, which increases the reliability of the equipment in combination with item (1).

(4) During heating, both the water side heat exchanger and the cold storage heat coil are used as source condensers, so the heat transfer area of the condenser is more than twice that of a general air-cooled heat pump chiller unit, and the condensing pressure performance and coefficient of performance are improved, and power consumption is reduced.

[Brief explanation of the drawing]

FIG. 1 shows a refrigeration cycle system diagram of the prior art, and FIG. 2 shows a refrigeration cycle system diagram of the present invention. 1...Compressor 2...Four-way valve 3...Air side heat exchanger 4...Liquid receiver 5...Dryer strainer 6
... Expansion valve for cooling 7 ... Expansion valve for cold storage 8 ...
Heating expansion valve 9...Cold storage heat coil 9a...Cold storage heat tank 10...Water side heat exchanger 11...Accumulator +2i3, 14.15i6.17.18...
Solenoid valve +9.20.21.22.23,24,25.
26.27...Check valve 28...Blower for air side heat exchanger. Figure 1n $2

Claims (1)

[Claims] Compressor, four-way valve, air side heat exchanger (non-use side), liquid receiver, expansion valve, cold storage heat coil, water side heat exchanger (use example),
In an air-cooled heat pump type air-conditioning system that consists of an accumulator, a solenoid valve for circuit switching, a check valve, etc., in the summer, the water side heat exchanger of the user side heat exchanger and the cold storage heat coil that stores cold by making ice at night are used. A cold storage heat type air conditioning system characterized by having a refrigeration cycle arranged in parallel, and in winter a refrigeration cycle having a water side heat exchanger and a cold storage heat coil arranged in series.