JPH031744Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of air conditioning equipment that normally controls air conditioning conditions above 0℃ under certain conditions, such as in environmental test chambers. One of the purposes is to recover waste heat energy discharged from the type condenser and use it effectively as an auxiliary heat source for heating.

BACKGROUND ART Conventionally, air conditioners in environmental test chambers and the like are generally configured with a cooling function of a refrigerator cycle that is operated regardless of air conditioning conditions, a warming heater that controls air conditioning conditions, and a humidifier. In such a configuration, when controlling the air conditioning to raise the temperature to the desired condition or for heating, the refrigeration cycle for cooling is operated at a constant rate, the heater input is increased, and the heating capacity of the heater exceeds the cooling capacity. The accuracy of air conditioning conditions was maintained by controlling the air conditioner. Furthermore, the hot water discharged from the water-cooled condenser is either directly discharged to the outside or is cooled by a cooling tower and used again, which is not effective from the viewpoint of energy saving.

In view of the above-mentioned conventional points, the present invention was developed in an air conditioner that controls the air conditioning of an environmental test room, etc., when controlling the air conditioning by heating operation, the waste hot water of the water-cooled condenser is used for heating. It is an object of the present invention to provide an air conditioner that can be effectively used as a hot water heater for air conditioning control and that can reduce its cooling capacity.

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

In FIG. 1, 1 is a compressor, 2 is a water-cooled condenser, 3 is an expansion valve, 4 is an evaporator, and 5 is an accumulator, which are sequentially connected in a ring to form a well-known refrigeration cycle. A switching valve 6 is provided between the expansion valve 3 and the evaporator 4, and one end thereof constitutes a bypass circuit 6a connected to a part of the evaporator 4. In addition, the inlet side waterway piping 2a of the water-cooled condenser 2
A first electromagnetic on-off valve 7 for a large flow rate of cooling water, a second electromagnetic on-off valve 8 for a medium flow rate, and a third electromagnetic on-off valve 9 for a small flow rate are connected in parallel, and the heating load can be controlled manually. It can be switched depending on the size. 1
Reference numeral 0 designates a cooling water electromagnetic on-off valve provided on the outlet side water pipe 2b of the water-cooled condenser 2, which operates in parallel with the cooling water electromagnetic on-off valve 10 during heating to recover waste heat and serve as an auxiliary heater. A hot water electromagnetic on-off valve 11 and a hot water heat exchanger 12 are connected in series. These constitute a bypass circuit 2c. Further, the evaporator 4 and the hot water heat exchanger 12 are provided in the same ventilation circuit. Further, the ventilation circuit includes a heater 13 and a humidifier 14, which can be air-conditioned according to the load.
is built in, and constitutes an air conditioner 17 together with a fan motor 15 and a fan 16.

Next, the electric circuit will be explained with reference to FIG. Here, the same numbers as those in FIG. 1 are given the same numbers, and the description thereof will be omitted.

In the figure, 17 is a power switch, 17a is a power supply, and 18 is a heating/cooling switch, which is switched to the X side for cooling and to the Y side for heating, depending on the air conditioning load conditions. Reference numeral 19 denotes an electromagnetic coil that is energized during cooling operation, and opens and closes the contacts 20. 21 is a main switch that changes the cooling water flow rate according to the load during heating, including a switch 22 for the first electromagnetic on-off valve 7 for large flow, a switch 23 for the second electromagnetic on-off valve 8 for medium flow, and a switch 23 for small flow. A switch 23 of the third electromagnetic on-off valve 9 is provided, and any one of the switches is configured to form a closed circuit. 25 is a thermostat for the heater 13 for air conditioning control, which opens and closes depending on the load. 2
6 is closed during heating operation in conjunction with the cooling/heating changeover switch 18 to guide the refrigerant to the bypass circuit 6a and reduce the cooling capacity.

Next, the operation of the air conditioner with the above configuration is set to cooling operation, heating operation to small heating capacity,
A description will be given of medium capacity and large capacity, with reference to a timing chart shown in FIG. 3 showing the operating status of the solenoid valve that opens and closes depending on the load status.

First, when performing cooling operation, turn on power switch 1.
7 and turn the cooling/heating switch 18 to
When the electromagnetic coil 19 is connected to the contact 2 on the side, the electromagnetic coil 19
Close 0. Therefore, the first electromagnetic on-off valve 7 is opened and cooling operation is performed. When the cooling capacity is too large and reaches a predetermined air conditioning condition, the thermostat 25 of the heater 13 is activated, and the input control of the heater 13 ensures the set air conditioning condition.

Next, in the case of "low" capacity during heating operation, the cooling/heating changeover switch 18 may be turned on to the contact on the Y side for heating, and the first electromagnetic on-off valve switch 22 for large electricity consumption may be closed.

On the other hand, since the cooling/heating changeover switch 18 is switched to the Y side contact, the cooling water solenoid valve 10 is closed and at the same time the hot water solenoid valve 11 is opened, and the cooling water is passed from the outlet of the water-cooled condenser 2 to the hot water solenoid valve 11. Bypass circuit 2 passing through valve 11 and through hot water heat exchanger 12
At the same time, the switching valve 6 causes the refrigerant to flow in the direction through the refrigerant bypass circuit 6a. Therefore, the refrigerant passes through a portion of the evaporator 4, undergoes heat exchange, and is circulated to the accumulator 5 and the compressor 1.

In this way, the heat source exhausted from the water-cooled condenser 2 can be effectively used as an auxiliary heater for heating, and since the refrigerant bypass circuit 6a is provided to reduce the cooling capacity, more effective heating can be performed.

In addition, when the capacity is "medium" during heating operation, similarly, the cooling/heating changeover switch 18 is set to Y for heating.
2nd electromagnetic switch 2 for medium flow rate
Just close 3. In this case, since the amount of cooling water is reduced compared to the case of "small" heating capacity, the temperature of the cooling water outlet from the water-cooled condenser 2 becomes higher, increasing the heating capacity of the hot water heat exchanger 12, and increasing the pressure The increase in the compression ratio accompanying the rise in , reduces the cooling capacity, and the heating capacity becomes larger than when the heating capacity is "small".

Next, in the case of "high" capacity during heating operation, similarly switch the cooling/heating changeover switch 18 to Y for heating.
The third electromagnetic on-off valve switch 24 for small flow rate may be closed. Therefore, similarly to the above, the heating capacity is further increased compared to the case of the "medium" heating capacity.

In this embodiment, a plurality of electromagnetic on-off valves 7, 8, and 9, which are flow rate variable means, are provided in the inlet side waterway pipe 2a of the water-cooled condenser 2, but a valve device that can continuously control the flow rate is installed. The heating capacity can be effectively controlled even when the temperature is high.

As is clear from the above embodiments, the air conditioner of the present invention has a switching valve between the expansion valve and the evaporator of a refrigeration cycle circuit equipped with a water-cooled condenser, and is connected to a part of the evaporator. On the other hand, a valve device having a flow rate variable means is provided in the inlet side waterway piping of the water-cooled condenser, and a cooling water solenoid on-off valve is provided in the outlet side waterway piping, so that the cooling water solenoid A bypass circuit consisting of an electromagnetic on-off valve for hot water and a heat exchanger for hot water is provided in parallel with the on-off valve, and the evaporator and the heat exchanger for hot water are provided in the same ventilation circuit,
The refrigerant bypass circuit is opened when the hot water electromagnetic on-off valve is opened. During heating operation, the refrigerant that exits the expansion valve flows to the bypass circuit, reducing the cooling capacity of the evaporator. The waste water from the type condenser is effectively used as a heat source for heating.
Heating capacity can be controlled according to load conditions, etc.
It has various advantages.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an air conditioner showing an embodiment of the present invention, Fig. 2 is an electric circuit diagram of the air conditioner, and Fig. 3 is a valve valve during cooling operation and heating operation in the air conditioner. It is a timing chart diagram showing the opening and closing of etc. 1...Compressor, 2...Water-cooled condenser, 2a...
Inlet side waterway piping, 2b...Outlet side waterway piping, 2c
... Bypass circuit, 3 ... Expansion valve, 4 ... Evaporator, 5 ... Accumulator, 6 ... Switching valve, 6a
...Bypass circuit, 10... Solenoid on-off valve for cooling water, 11... Solenoid on-off valve for hot water, 12... Heat exchanger for hot water.

Claims (1)

[Scope of utility model registration request] A compressor, a water-cooled condenser, an expansion valve, an evaporator, and an accumulator are sequentially connected by refrigerant piping, and a switching valve is provided between the expansion valve and the evaporator to form a refrigerant bypass circuit connected to the middle of the evaporator. A valve device having a flow rate variable means is provided in the inlet side waterway piping of the water-cooled condenser, and a cooling water electromagnetic on-off valve is provided on the outlet side waterway piping, and in parallel with this cooling water electromagnetic on-off valve, the A bypass circuit is installed in which an operating electromagnetic on-off valve for hot water and a hot water heat exchanger are connected in series.
The evaporator and the hot water heat exchanger are provided in the same ventilation path,
An air conditioner configured to open a refrigerant bypass circuit when the cooling water solenoid on-off valve is closed and the hot water solenoid on-off valve is opened.