JPS6050262B2 - Heat recovery type cold/hot water device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat recovery type cold/hot water device used in air conditioning equipment.

Conventional hot and cold water equipment of this type is of the double handle or double condenser type, with two condensers for exhaust heat and heating, and one evaporator.

During cooling, the air conditioning zone and the heat recovery zone are cooled using cold water produced by the evaporator, and the heat is removed by the waste heat condenser. - On the other hand, during heating, the evaporator heats the heat recovery zone. A heat recovery heating and cooling system using such a conventional heat recovery type water cooling/heating device has the following drawbacks. (a) Since the heat exchanger connected to the air conditioner in the cooling and heating zone is different for cooling and heating, it is necessary to switch the cold and hot water system for cooling and heating, making the cold and hot water system complicated and requiring maintenance. Not only is it time-consuming, but the piping work for cold and hot water is expensive.

(b) The evaporator is used only for cooling the heat recovery zone in winter, but since it is one evaporator even during cooling, it has a large capacity. (c) Since there is one cold/hot water system for the cooling/heating zone and the heat recovery zone, water is generally used as a heat medium.

For this reason, in the winter, the water temperature in the heat recovery zone cannot be used if it is below 5°C, so the amount of waste heat that can be used is limited. The purpose of the present invention is to eliminate the above-mentioned drawbacks, and the purpose of the present invention is to connect a condenser, a heating/cooling heat exchanger, a heat recovery evaporator, and a suction side of the compressor to the discharge side of the compressor via a three-way valve. A heat recovery evaporator is connected to the condenser through a heat recovery expansion valve and a solenoid valve, and an air conditioning heat exchanger is connected via an air conditioning expansion valve and a solenoid valve. This system is characterized in that the cold/hot water system, the heat recovery system, and the exhaust heat cooling water system are each independent.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a compressor, 2 is a three-way valve provided on the discharge side of the compressor 1, 3 is a condenser connected to the A side of the three-way valve 2, and 4
is connected to the B side of the three-way valve 2, and the check valves 6, 7,
The air conditioning heat exchanger 5 is connected to the condenser 3 via the solenoid valve 8 and the expansion valve 9, and the air conditioning heat exchanger 5 is connected to the three-way valve 2 and the air conditioning heat exchanger 4 via the electromagnetic valve 13. 6
, a heat recovery evaporator connected to a condenser 3 via a solenoid valve 11 and an expansion valve 12, and the solenoid valve 11 is connected to check valves 7 and 10 provided in parallel on the cooling/heating heat exchanger 4 side. It is connected.

Further, a circuit 15 on the inlet side of the compressor 1 is connected to a circuit 14 that connects the heat recovery evaporator 5 and the electromagnetic valve 13. Next, the operation of this embodiment configured as described above will be explained.

(1) In the case of cooling operation In this case, the A side of the three-way valve 2 is fully closed, the solenoid valves 8, 11, and 13 are opened, and the heating and cooling zone is controlled by the cooling and heating heat exchanger 4, and the heat recovery evaporator 5 The heat recovery zones are cooled by the respective cooling systems, and the heat is exhausted by the condenser 3.

(Ii) When only waste heat is processed during the intermediate period:
Rooms where people are present, such as general offices, are not air-conditioned or heated, but heat generated by machine rooms such as computers is exhausted.

In this case, the A side of the three-way valve 2 is fully closed, the solenoid valve 11 is opened, and the solenoid valves 8 and 13 are closed, and the heat recovery zone is cooled by the heat recovery evaporator 5 and exhausted by the condenser 3. Do heat.

(III) In case of heating operation C
In this case, when the heating load is large, the B of the three-way valve 2
side, open the solenoid valve 11, and close the solenoid valve 8.
.

On the other hand, when the heating load becomes small and the temperature of the hot water flowing into the cooling/heating heat exchanger 4 exceeds a certain temperature, the three-way valve 2 adjusts the temperature of the hot water flowing into the cooling/heating heat exchanger 4 to be constant.
．． The B side is opened appropriately, and the excess recovered heat is exhausted by the condenser 3.

According to the present invention described above, there are effects listed below.

(a) Since the cold and hot water system for air conditioning, the heat recovery system, and the cooling water system for exhaust heat are each independent, there is no need to switch the water circuit, so there is no need for a switching valve, and the three-way valve of the cold and hot water system All you need to do is electrically switch three solenoid valves.

Therefore, maintenance is easy and cold/hot water piping construction costs are low. (b) The cooling/heating heat exchanger and the heat recovery evaporator each have a capacity corresponding to the load, so the capacity can be reduced.

(c) Since the heat recovery system is independent, if brine is used in this system, the brine temperature can be used from -7°C to -10°C, so low-temperature waste heat can also be used, increasing the effective use of waste heat. is possible.

(d) When the heating load is small, the opening degree of the three-way valve can be proportionally controlled depending on the hot water temperature, and the surplus of the recovered heat can be exhausted, so stable operation is always possible even if the heating load and recovered heat are not balanced. be able to.

[Brief explanation of drawings]

The drawing is a system diagram of the heat recovery type cold/hot water device of the present invention. 1... Compressor, 2... Three-way valve, 3...
... Condenser, 4 ... Air conditioning heat exchanger, 5
...Evaporator for heat recovery, 8,11...Solenoid valve, 9,12...Expansion valve.

Claims (1)

[Claims] 1 In a heat recovery type chilled/hot water system in which a compressor, condenser, expansion valve, evaporator, heat recovery equipment, etc. are connected to form a refrigeration cycle, during cooling operation, compressor 1 - three-way valve 2 - condenser 3-Check valve 6-Check valve 7-Solenoid valve 8-Expansion valve 9-Heating and cooling heat exchanger 4-Solenoid valve 13-Compressor 1 cycle, and the check valve 6-Solenoid valve 11-Expansion valve 12-
A parallel cycle consisting of evaporator 5 for heat recovery - compressor 1 is formed, and in the intermediate period, compressor 1 - three-way valve 2 - condenser 3 - check valve 6 - solenoid valve 11 - expansion valve 12 - for heat recovery A cycle of evaporator 5 and compressor 1 is formed, and during heating operation, compressor 1
- Three-way valve 2 - Air conditioning heat exchanger 4 - Check valve 10 - Solenoid valve 11 - Expansion valve 12 - Heat recovery evaporator 5 - Compressor 1 cycle, or a three-way system partially parallel to the above cycle A heat recovery type chilled/hot water device characterized in that both cycles of a valve 2-condenser 3-check valve 6-electromagnetic valve 11 are formed.