JP3639810B2 - Constant temperature apparatus and constant temperature method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention generally relates to a constant temperature apparatus and a constant temperature method. More specifically, the present invention relates to a thermostatic device and a thermostatic method that make it possible to reuse the amount of heat released. Thermostatic devices are used in a wide range of fields such as electronics, automobiles, machinery, and construction, and in particular, in the fields of biotechnology and medical science, such as experiments and research facilities of universities and pharmaceutical manufacturers. In addition, it can also be used as a constant temperature and humidity apparatus by incorporating a humidity device into the constant temperature apparatus of the present invention.
[0002]
[Prior art]
In general refrigerators, the refrigerator is controlled on and off with a thermostat, but there is a time lag between the operation or stoppage of the thermostat and the ventilation or stoppage of the refrigerator, making it difficult to control according to the set temperature. An error of 2 to 3 ° C occurs in the set temperature. On the other hand, unlike a general refrigerator, in a thermostatic device that requires that temperature conditions be strictly maintained, the refrigerator is always on, and the temperature is controlled by a heater placed in front of the evaporator. I have control.
[0003]
Referring to FIG. 4, the conventional thermostat 50 will be described in more detail. A thermostatic chamber 52 of the thermostat 50 is installed in a building. An evaporator 54 is disposed inside the temperature-controlled room 52, and a heater 68 is disposed in front of the evaporator 54. A condenser 56 and an evaporator 54 arranged outside the temperature-controlled room 52 are connected by a pipe 58, and the compressor 60 is interposed in the pipe 58. Further, the condenser 56 and the evaporator 54 are connected by another pipe 62, and a decompressor 66 is interposed in the pipe 62. The heater 56 has a large capacity (usually the amount of power used is about five times that of the refrigerator). When the thermostatic device 50 is operated, the temperature inside the thermostatic chamber 52 is controlled by keeping the device always on and continuously supplying cold air from the evaporator 54 and operating or stopping the heater 68.
[0004]
[Problems to be solved by the invention]
However, since the conventional thermostatic apparatus uses a large-capacity heater, power consumption increases, resulting in a high cost. Moreover, in the conventional thermostat, since the amount of heat acquired in the thermostatic chamber is released to the outside of the room, the temperature in the building rises, and there is a disadvantage that the air conditioner is loaded.
[0005]
Accordingly, an object of the present invention is to provide a constant temperature device and a constant temperature method that reduce the amount of heat released and conserve power.
[0006]
[Means for Solving the Problems]
The thermostat according to claim 1 of the present application is an evaporator / condenser that is disposed inside a temperature-controlled room and has an evaporation part and a condensation part provided with fins shared by each other, and a condenser that is arranged outside the temperature-controlled room The outlet port of the evaporator of the evaporator / condenser and the inlet port of the condenser are connected by a first pipe, a compressor is interposed in the first pipe, and the outlet port of the condenser And the condensing part inlet port of the evaporator / condenser are connected by a second pipe, and the condensing part outlet port of the evaporator / condenser and the evaporator inlet port are connected by a third pipe. The third pipe is provided with a pressure reducer.
[0007]
The constant temperature device according to claim 2 of the present application is the device according to claim 1, further comprising a heater arranged in front of the evaporation part of the evaporator / condenser inside the constant temperature chamber. It is.
[0008]
The constant temperature method according to claim 3 of the present application includes a step of pressurizing the refrigerant gas with a compressor, a step of supplying the pressurized refrigerant gas to a condenser disposed outside the thermostatic chamber, and a refrigerant gas. Cooling with a condenser to make a refrigerant liquid, supplying the refrigerant liquid to a condensing part of an evaporator / condenser provided inside the temperature-controlled room and provided with fins shared with each other, and supercooling, Depressurizing the supercooled refrigerant liquid with a decompressor, supplying the depressurized refrigerant liquid to the evaporation section of the evaporator / condenser to evaporate, and supplying the evaporated refrigerant gas to the compressor And a stage.
[0009]
The constant temperature method according to claim 4 of the present application further includes the step of supplying warm air into the temperature-controlled room by a heater arranged in the temperature-controlled room according to the temperature in the temperature-controlled room according to the method of claim 3. It is characterized by this.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, a thermostat according to a preferred embodiment of the present invention will be described with reference to the drawings. A thermostat according to a preferred embodiment of the present invention, indicated generally by the reference numeral 10 in FIG. 1, includes an evaporator / condenser 14 disposed inside a thermostatic chamber 12. The evaporator / condenser 14 includes an evaporator 14a and a condenser 14b. The evaporator 14a and the condenser 14b are provided with fins (not shown) that are shared with each other. The evaporator / condenser 14 is provided with an evaporator / condenser fan 14c.
[0011]
In addition, the thermostatic device 10 includes a condenser 16 disposed outside the thermostatic chamber 12. The outlet port of the evaporator 14 a of the evaporator / condenser 14 and the inlet port of the condenser 16 are connected by a first pipe 18, and a compressor 20 is interposed in the first pipe 18.
[0012]
The outlet port of the condenser 16 and the inlet port of the condensing part 14 b of the evaporator / condenser 14 are connected by a second pipe 22.
[0013]
The outlet port of the condensing unit 14b of the evaporator / condenser 14 and the inlet port of the evaporator unit 14a are connected by a third pipe 24 extending outside the temperature-controlled room 12, and the third pipe 24 includes A decompressor 26 arranged outside the temperature-controlled room 12 is interposed. As the pressure reducer 26, an expansion valve or the like is usually used.
[0014]
In addition, you may use a normal thing for the evaporation part 14a of the above-mentioned evaporation / condenser 14, the condensation part 14b, the condenser 16, the compressor 20, and the pressure reduction device 26. FIG. Further, a heater (not shown) may be disposed in front of the evaporator 14a of the evaporator / condenser 14.
[0015]
The operation of the thermostatic device 10 of the present invention configured as above will be described. The low-temperature and low-pressure refrigerant gas is pressurized in the compressor 20 to become a high-temperature and high-pressure refrigerant gas and flows into the condenser 16 from the inlet port of the condenser 16. The high-temperature and high-pressure refrigerant gas flowing into the condenser 16 is cooled and liquefied by the condenser 16 and becomes a low-temperature and high-pressure refrigerant liquid. The low-temperature and high-pressure refrigerant liquid flows through the second pipe 22 and flows into the condensing unit 14 b from the inlet port of the condensing unit 14 b of the evaporator / condenser 14. The low-temperature and high-pressure refrigerant liquid that has flowed into the condensing unit 14 b is further subcooled, passes through the third pipe 24, and flows into the decompressor 26. The low-temperature and high-pressure refrigerant liquid is depressurized in the decompressor 26 to become a low-temperature and low-pressure refrigerant liquid, enters the inlet port of the evaporator 14a of the evaporator / condenser 14, and evaporates in the evaporator 14a to take away latent heat of evaporation from the surroundings. Thus, the inside of the temperature-controlled room 12 is cooled. The evaporated low-temperature and low-pressure refrigerant gas flows again into the compressor 20 from the outlet port of the evaporation unit 14a via the first pipe 18, and repeats the above-described operation. In addition, according to the temperature in the temperature-controlled room 12, you may supply warm air in the temperature-controlled room 12 with the heater arrange | positioned in the temperature-controlled room 12.
[0016]
Next, a test carried out to verify the effectiveness of the thermostat according to the present invention will be described. In the test, equipment (see FIG. 2) consisting of a temperature-controlled room and a machine room was prepared. Then, an evaporator / condenser (device of the present invention) or an evaporator (device of the prior art) is installed in the temperature-controlled room, and a refrigerator / condenser is installed in the machine room, and the evaporator / condenser or evaporator is installed. The refrigerator and the refrigerator / condenser were connected by a refrigerant pipe. In addition, a heater was installed in front of the evaporator / condenser in the apparatus of the present invention and in front of the evaporator in the prior art apparatus in order to keep the temperature in the temperature-controlled room constant. The dimensions of the temperature-controlled room and the machine room are as shown in FIG.
[0017]
In the above equipment (the device of the present invention and the prior art device), the temperature in the machine room when the temperature in the temperature-controlled room is maintained at 35 ° C., and the power consumption of the equipment (ie, heater, refrigerator, fan) The electric power required to operate each was measured.
[0018]
FIG. 3 is a graph showing data measured in the test, where (a) shows data in the apparatus of the present invention, and (b) shows data in the apparatus of the prior art. 3A and 3B, the upper half graph indicates the temperature in the temperature-controlled room, and the lower half graph indicates the temperature in the machine room and the outside air temperature. In each graph, the vertical axis represents temperature (° C) and the horizontal axis represents time (minutes).
[0019]
As can be seen from these graphs, when the temperature inside the temperature-controlled room is maintained at 35 ° when the outside air temperature is about 20 ° C., the temperature in the machine room is 23 ° C. to 24 ° C. in the apparatus of the present invention. In prior art devices, it is 27 ° C to 28 ° C. The average power consumption of the facility was 0.79 kW / h for the device of the present invention and 1.42 kW / h for the device of the prior art.
[0020]
From the above, in the apparatus of the present invention, the power consumption is about 55% and the temperature in the machine room is about 4 ° C. lower than the apparatus of the prior art under the above-mentioned setting conditions. Thereby, reduction of emitted heat amount and realization of power saving could be confirmed.
[0021]
The present invention is not limited to the embodiments of the invention described above, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say, it is something.
[0022]
For example, in the above-described embodiment, the present invention has been described in relation to the thermostatic device. However, the present invention may be applied to a thermostatic and humidity device in which a humidity device is incorporated in the thermostatic device.
[0023]
【The invention's effect】
According to the present invention, it is possible to reduce the load on the air conditioner by suppressing the power consumption and reducing the cost and suppressing the temperature rise in the building.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a thermostatic apparatus according to a preferred embodiment of the present invention.
FIG. 2 is a schematic diagram of the equipment used for the tests conducted to demonstrate the effectiveness of the apparatus of the present invention.
FIG. 3 is a graph showing measured data in a test performed to demonstrate the effectiveness of the device of the present invention.
FIG. 4 is a schematic view showing a conventional thermostatic device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Constant temperature apparatus 12 Constant temperature chamber 14 Evaporation / condenser 14a Evaporating part 14b Condensing part 16 Condenser 20 Compressor 26 Decompressor 18, 22, 24 Piping 14c, 16a Fan

Claims (4)

A thermostat,
An evaporator / condenser disposed inside a temperature-controlled room and having an evaporator and a condenser provided with fins shared by each other;
A condenser disposed outside the temperature-controlled room,
An outlet port of the evaporator of the evaporator / condenser and an inlet port of the condenser are connected by a first pipe, and a compressor is interposed in the first pipe,
The outlet port of the condenser and the inlet port of the condensing part of the evaporator / condenser are connected by a second pipe,
An outlet port of the condensing part of the evaporator / condenser and an inlet port of the evaporator part are connected by a third pipe, and a decompressor is interposed in the third pipe.
A device characterized by that.   The apparatus according to claim 1, further comprising a heater disposed in front of the evaporation unit of the evaporator / condenser inside the temperature-controlled room. A constant temperature method,
Pressurizing the refrigerant gas with a compressor;
Supplying the pressurized refrigerant gas to a condenser disposed outside a temperature-controlled room;
Cooling the refrigerant gas with a condenser to form a refrigerant liquid;
Supplying the refrigerant liquid to a condensing part of an evaporator / condenser provided inside the temperature-controlled room and provided with fins shared with each other, and supercooling;
Depressurizing the supercooled refrigerant liquid with a decompressor;
Supplying the depressurized refrigerant liquid to the evaporation section of the evaporator / condenser to evaporate;
Supplying the evaporated refrigerant gas to a compressor;
A method characterized by comprising:   The method according to claim 3, further comprising the step of supplying warm air into the temperature-controlled room with a heater arranged in the temperature-controlled room according to the temperature in the temperature-controlled room.

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