JP2000274788A - Heating device, cooling device, and air conditioner utilzing the cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating device, a cooling device and an air conditioner utilizing the cooling device capable of easily and stably controlling its temperature. SOLUTION: A plurality of cooling devices 42 are disposed at an air conditioning vent passage 41 so that a heat absorbing surface 42a of the device 42 becomes a ventilating passage inside and a heat radiating surface 42b becomes a ventilating passage outside. The surface 42b is cooled by circulating a cooling water, and regulated to become a desired temperature. Thus, a temperature of the surface 42a can be set to the desired temperature, and the air passing through the passage 41 can be cooled. Since the cooled air is fed into a room by a blower 43, an indoor temperature can be lowered. The temperature can be effectively and stably controlled without influence of an atmospheric temperature like a conventional air conditioner used in general.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the case where a voltage is applied to two different conductors (metal or semiconductor).
The present invention relates to a heating device that heats a body to be heated using the Peltier effect, a cooling device that cools a body to be cooled, and an air conditioner that uses the cooling device.

[0002]

2. Description of the Related Art For example, in a vehicle having a refrigerating function, in order to maintain the temperature in a freezer at a low temperature, a vehicle using a cooling device utilizing the Peltier effect is often used. As is well known, the Peltier effect is a phenomenon in which when a DC voltage is applied to two different types of conductors (metal or semiconductor), one of the two junctions absorbs heat and the other releases heat. Using this principle, the inside of the freezer can be cooled if the inside of the freezer is the heat absorbing side and the outside is the heat radiating side.

In such a cooling device utilizing the Peltier effect, the temperature difference between the heat-absorbing side and the heat-dissipating side is determined to be substantially constant by the size, material, and the like of the two types of conductors. For example, since the temperature difference is determined to be 46 ° C., if the heat radiation side is set to the outside air of about 25 ° C., the heat absorption side becomes 46 ° C.
It will be -21 ° C lower by ° C. That is, if a DC voltage is continuously applied to the cooling device using the Peltier effect, the temperature in the freezer in which the cooling device is mounted is forced to be about −21 ° C. ,
The temperature inside the freezer is measured, and the DC power supply is turned on and off so that the temperature becomes a desired temperature.

[0004] For this reason, frequent on / off operations are required to maintain a predetermined temperature, and there is a drawback that the temperature is difficult to stabilize at a constant value. Acceptable ones can be employed, but are not suitable for applications where a stable temperature is always desired, such as indoor air conditioners.

[0005] On the other hand, air conditioners used in offices and ordinary homes have indoor units and indoor units, respectively.
When an outdoor unit is installed and, for example, it is desired to set the indoor temperature to 25 ° C., the indoor temperature is controlled to this set temperature, and the heat corresponding to the lowered indoor temperature is released from the outdoor unit. Normally, the temperature of the outside air (outdoor temperature) is about 35 ° C even in midsummer, when the temperature is extremely high. Since the temperature radiated by the outdoor unit is higher than this, it is possible to radiate heat and operate the air conditioner without problems. Can be.

However, there are places in the tropics and subtropics around the world where the outside air temperature can reach 40 ° C. or higher. In such a territory, the efficiency of heat radiation by the outdoor unit is extremely low, and smooth operation is not possible. Many problems occur.

[0007]

As described above, in the conventional cooling device utilizing the Peltier effect, the temperature on the cooling side is controlled by switching the power supply voltage on and off. In addition, there is a disadvantage that it is necessary to switch off, and it is difficult to maintain the temperature at a constant value.

On the other hand, in a conventional indoor air conditioner, when the outside air temperature exceeds 40 ° C., the efficiency of heat radiation is reduced, and a problem arises that smooth operation cannot be performed. The present invention has been made to solve such a conventional problem, and an object thereof is to use a heating device, a cooling device, and a cooling device capable of easily and stably controlling the temperature. An object of the present invention is to provide an air conditioner.

[0009]

In order to achieve the above object, the cooling device according to the first aspect of the present invention has a heat absorbing plate at a point where heat is absorbed by a Peltier effect which occurs when a voltage is applied to two different types of conductors. In the cooling device that cools the object to be cooled by installing a radiator plate at a point where the heat is radiated, and by bringing the heat absorbing plate into contact with the object to be cooled,
A means for adjusting the temperature of the heat sink to a predetermined temperature is provided,
The temperature of the heat absorbing plate is controlled by adjusting the temperature of the heat radiating plate.

[0010] The heating device according to the second aspect of the present invention is characterized in that:
A heat absorbing plate is installed at a point where heat is absorbed by a Peltier effect, which is generated when a voltage is applied to two different conductors, and a heat sink is installed at a point where heat is released, and the heat sink is brought into contact with the object to be heated. Thus, in the heating device for heating the body to be heated, means for adjusting the temperature of the heat absorbing plate to a predetermined temperature is provided, and by adjusting the temperature of the heat absorbing plate, the temperature of the heat radiating plate is reduced. It is characterized by controlling.

According to a third aspect of the present invention, in the air conditioner for adjusting the indoor temperature, a heat absorbing plate is provided at a point where heat is absorbed by a Peltier effect, which is generated when a voltage is applied to two different conductors, and A cooling device that cools the air to be cooled by contacting the heat absorbing plate with the air to be cooled by installing a heat radiating plate at a point where the heat is radiated; Air supply means for discharging the cooling air obtained in the room, a cooling medium that contacts the heat sink of the cooling device to cool the heat sink, and a temperature that adjusts the temperature of the cooling medium to a desired temperature. And control means.

According to a fourth aspect of the present invention, there is provided an air conditioner for maintaining a room temperature at a substantially constant level, comprising: a ventilation path for air conditioning; and an air supply means for circulating room air through the ventilation path. When a voltage is applied to a different kind of conductor, a heat absorbing plate is installed at a point where heat is absorbed by the Peltier effect, and a heat radiating plate is installed at a point where heat is released, and the heat absorbing plate is brought into contact with the circulated air. A cooling device that cools the circulating air, wherein the cooling device is arranged such that the heat absorbing plate is on the inside of the ventilation path and the heat radiating plate is on the outside of the ventilation path. A cooling liquid pipe that circulates the cooling liquid sent out by the pump and cools the radiator plate; and a heat exchange unit that is installed at an appropriate position of the cooling liquid pipe and lowers the temperature of the cooling liquid. It is characterized by.

According to a fifth aspect of the present invention, in the air conditioner, the cooling liquid pipe includes a feed pipe for sending the cooling liquid to the heat radiating plate, and a cooling liquid passing through the heat radiating plate to return to the cooling liquid pump. A temperature detecting means for measuring a coolant temperature after contact with the heat sink,
A bypass pipe is provided between the feed pipe and the return pipe to bypass the radiator plate, and an open / close valve installed on the bypass pipe path, and the open / close valve is opened according to a temperature detected by the temperature detecting means. Means for adjusting the temperature and controlling the temperature of the heat sink to be constant.

According to a sixth aspect of the present invention, the air conditioner further comprises a temperature detecting means for measuring a temperature of the coolant after contacting the heat radiating plate, and the heat exchanger is operated to set the detected temperature to a desired temperature. It is characterized by having control means. The air conditioner described in claim 7 is characterized in that fins for improving the cooling efficiency of the air in the ventilation path are provided on the heat absorbing plate disposed inside the ventilation path.

According to the cooling device and the heating device according to the first and second aspects of the present invention, one of the heat absorbing plate that absorbs heat by the Peltier effect and the heat radiating plate that radiates heat is provided. Is controlled via a medium such as cooling water or heating water, and the other temperature is adjusted. For example, when the temperature difference between the heat absorbing plate and the heat radiating plate is 46 ° C., by controlling the temperature on the heat radiating side to 46 ° C., the temperature on the heat absorbing side can be set to 0 ° C. As a result, relatively simple and stable temperature control becomes possible.

Further, in the air conditioner according to the third to seventh aspects of the present invention, a plurality of cooling devices in the ventilation path having a surface on the heat absorption side as a heat absorption surface and a surface on the heat radiation side as a heat radiation surface due to the effect of Peltier. And the heat absorbing surface is disposed on the inner surface side of the ventilation path, and the heat radiation surface is disposed on the outer surface side of the ventilation path. And
When a DC voltage is applied to the cooling device and the temperature of the heat radiating surface is cooled using cooling water, the temperature of the heat absorbing surface is cooled to a desired temperature (for example, 14 ° C.). The heat will be released and cooled. In addition, if fins are provided on the heat absorbing surface, the efficiency of heat exchange is improved, and effective air conditioning is possible.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a cooling device according to an embodiment of the present invention. As shown in the drawing, the cooling device 1 includes a P-type semiconductor 2 and an N-type semiconductor 3 and a P-type semiconductor 2. Is connected to one end of the N-type semiconductor 3 as a heat-absorbing surface 4, and the other end of the P-type semiconductor 2 and the other end of the N-type semiconductor 3 are formed as heat-radiating surfaces 5a and 5b, respectively. 5a is connected to the negative side of the DC power supply 6 and has a heat radiation surface 5b.
Are connected to the plus side, respectively.

The heat radiating surfaces 5a and 5b are covered with a casing 7 for cooling, a cooling pipe 8 is connected to the casing 7, and cooling water accumulated in a water storage tank 13 by a water supply pump 9 is provided. It can be circulated. Further, a heat exchanger 10 for controlling the temperature of the cooling water is provided on the path of the cooling pipe 8, and the temperature of the cooling water is supplied to the cooling pipe 8 on the outlet side of the casing 7. A thermometer 11 for measurement is provided. And
The measurement result of the thermometer 11 is fed back to the control means 12 so that the heat exchanger 10 can be controlled.

Next, the operation of the cooling device configured as described above will be described. When a voltage from the DC power supply 6 is applied to the heat radiating surfaces 5a and 5b, the temperature of the heat absorbing surface 4 decreases with time due to the Peltier effect, and conversely, the temperatures of the heat radiating surfaces 5a and 5b increase. If the temperature difference is determined to be, for example, 46 ° C., the temperature difference between the heat absorbing surface 4 and the heat radiating surfaces 5a, 5b is approximately 46 ° C. That is, when the state in which the water pump 9 is stopped (that is, the state in which the cooling water in the casing 7 is not circulated) is maintained, the heat absorbing surface 4 gradually approaches the outside temperature, and the outside temperature is temporarily 20 ° C. In this case, the temperature of the heat radiation surfaces 5a and 5b is 66
° C.

Here, when the water supply pump 9 is driven to circulate the cooling water in the casing 7 through the cooling pipe 8,
The cooling water cools the heat radiating surfaces 5a and 5b by passing through the casing 7, and thereafter, the operation of reducing the temperature in the heat exchanger 10 and introducing the cooling water into the casing 7 again is repeated.

The temperature of the cooling water is measured by a thermometer 11 installed on the outlet side of the casing 7, and the control means 12 controls the operation of the fan 10a mounted on the heat exchanger 10 based on the measurement result. Therefore, the temperature of the cooling water can be arbitrarily adjusted, and the temperature of the heat radiating surfaces 5a and 5b can be adjusted. For example, if the temperature of the cooling water is adjusted to be 60 ° C., the temperature of the heat radiating surfaces 5a and 5b is also 60 ° C., and the temperature of the heat absorbing surface 4 which is a difference of 46 ° C. from this heat radiating surface is 14 ° C. . Thus, the temperature of the heat absorbing surface 4 can be set arbitrarily.

As described above, in the cooling device according to the present embodiment, the heat radiating surfaces 5a and 5b are brought into contact with the cooling water, and the cooling water is circulated to control the temperature. Since the temperature is set to a predetermined temperature and the temperature of the heat absorbing surface 4 is set to a desired temperature, stable temperature control can be performed without switching the DC power supply 6 on and off as in the related art. Become.

In the above embodiment, the heat radiation surface 5
Although the cooling device that controls the temperature of the heat absorbing surface 4 by cooling the a and 5b sides has been described, a heating device may be formed by reversing the cooling device. FIG.
FIG. 1 is an explanatory view showing the configuration of such a heating device. The heating device 21 includes a P-type semiconductor 22 and an N-type semiconductor 23.
, Heat absorbing surface 24, heat radiating surfaces 25 a and 25 b, DC power supply 26, casing 27, heating pipe 28, water pump 29, heat exchanger 30, thermometer 31, and control means 32. , A water storage tank 33. In the present embodiment, antifreeze is used as the warming water circulated by the water pump 29.

Next, the operation of the heating device according to this embodiment will be described. When the DC power supply 26 is turned on with the water supply pump 29 turned off, the temperature of the heat radiation surfaces 5a and 5b is set to the outside air temperature (temporarily 20 ° C.).
Is −26 ° C. here,
When the water supply pump 29 is started, the heated water accumulated in the water storage tank 33 circulates through the heating pipe 28,
When passing through the casing 27, the heat absorbing surface 24 is heated,
The temperature of the heat absorbing surface 24 is increased. This temperature is measured by thermometer 3.
1 and adjusted by the heat exchanger 30 operating under the control of the control means 32, the temperature of the heat absorbing surface 24 can be set arbitrarily. For example, if the temperature of the heat absorbing surface 24 is 0 ° C.
By setting so that the temperature of the heat radiation surfaces 25a and 25b is maintained at 46 ° C. This enables stable temperature control.

FIG. 3 is a side view schematically showing the configuration of an air conditioner according to one embodiment of the present invention, and FIG. 4 is a plan view of the same. As shown in FIGS. 3 and 4, the air conditioner includes an air passage 41 serving as a passage of air sucked from a room to be air-conditioned,
A plurality of cooling devices 42, 42,... Installed on the piping of the ventilation passage 41, and heat for improving the heat exchange efficiency between the cooling devices 42, 42, and the air passing through the ventilation passage 41. A blower 43 for introducing room air into the ventilation passage 41, discharging the cooled air into the room while contacting the cooling devices 42, 42,..., And an outlet of the blower 43 HEPA filter 44 installed on the side
And Reference numeral 45 denotes a drain pan that accumulates and discharges water droplets generated by dew condensation in the ventilation path.

The cooling device 42 is a cooling device utilizing the Peltier effect as shown in FIG. 1. The surface inside the ventilation passage 41 indicated by reference numeral 42a is a heat absorbing surface,
The outer surface of the ventilation path 41 shown by 2b is a heat radiation surface.
Although not shown in FIG. 3, the cooling device 4
A DC power supply is connected to 2, 42,... As shown in FIG. 1, and when DC voltage is applied, it operates so that the heat absorbing surface 42a side is cooled by the Peltier effect.

A feed pipe 46 and a return pipe 47 are provided on the heat radiating surface 42b so that cooling water in contact with the heat radiating surface 42b can circulate. Further, as shown in FIG.
7 is provided, and a feed pipe 46 and a return pipe 47 are disposed in the heat radiation chamber 57. Further, electric wires not shown are also arranged in the heat radiating chamber 57. The surroundings of the heat radiating chamber 57 are kept warm by a heat insulating material.

The return pipe 47 is connected to the inlet side of the heat exchanger 49, and the outlet side of the heat exchanger 49 is connected to the feed pipe 46 via the water storage tank 50 and the water pump 51. A bypass pipe 53 for bypassing the heat radiation surface 42b is provided between the feed pipe 46 and the return pipe 47, and the bypass pipe 53 and the return pipe 47 are connected via an electromagnetic three-way valve 54. Connected.
Further, the return pipe 47 is provided with a thermometer 55 for measuring the temperature of the cooling water passing through the heat radiating surface 42b, and the three-way valve 54 is controlled by the control means 56 based on the temperature measured by the thermometer 55. The switching operation is performed below.

FIG. 5 is a perspective view showing the internal structure of the ventilation passage 41. As shown in FIG. 5, the heat absorbing surfaces 42a of the cooling device 42 are provided on two opposite sides of the ventilation passage 41, respectively. A plurality of heat exchange fins 52 arranged substantially in parallel are arranged between the heat absorbing surfaces 42a facing each other. The heat exchange fin 52 has a heat absorbing surface 42a.
This is for increasing the contact area between the air and the air flowing through the ventilation passage 41 to improve the heat exchange efficiency.

FIG. 6 is an explanatory view showing an example in which the air conditioner of the present embodiment is configured as one casing 58.
8 is installed at an appropriate place in the room to be air-conditioned. As shown in the figure, room air is taken in from an air inlet 59 formed below the housing 58, and is discharged to an outlet duct via the blower 43 after cooling. A space 60 for the operation panel is provided above the heat radiating chamber 57.

Next, the operation of the present embodiment configured as described above will be described. When the blower 43 shown in FIG. 3 is started, air from the room is introduced into the ventilation path 41. When a DC voltage from a DC power supply (not shown) is applied to each of the cooling devices 42, 42,..., The temperature of the heat absorbing surface 42a decreases due to the Peltier effect. The temperature rises. Now, when the temperature in the ventilation path 41 is 30 ° C. and the temperature difference caused by the Peltier effect of the cooling device 42 is 46 ° C., the temperature of the heat radiation surface 42b is 76 ° C.

When the water pump 48 is started and the cooling water is circulated through the feed pipe 46 and the return pipe 47, the cooling water comes into contact with the heat radiation surface 42b (at this time, the cooling water is bypassed by the three-way valve 54). The pipe 53 is closed), and the temperature of the heat radiation surface 42b starts to decrease, and the temperature of the cooling water increases. Then, the cooling water whose temperature has risen is introduced into the heat exchanger 49, and is sent out again to the feed pipe 46 after the temperature has dropped.

If the temperature of the heat absorbing surface 42a is to be 14 ° C., the temperature of the heat radiating surface 42b is 60 ° C. (the temperature difference is
6 ° C.).
Therefore, the control means 56 monitors the temperature measured by the thermometer 55, and when the temperature is 60 ° C. or more, the three-way valve 54 is kept in the same state (the bypass pipe 53 is closed), and the measurement is performed. When the temperature becomes 60 ° C. or lower, there is no need to further cool the heat radiating surface 42b, so the three-way valve 54 is switched to open the bypass pipe 53 and close the pipe on the heat radiating surface 42b side. . As a result, the cooling water sent through the feed pipe 46 is
It is circulated through the return pipe 47 as it is without contacting the b. The temperature detected by the thermometer 55 is 60 ° C.
In the case described above, the three-way valve 54 is returned to the original state, and the heat radiation surface 42b is cooled.

Thus, the temperature of the heat radiation surface 42b is maintained at the desired temperature of 60 ° C.
° C, and the air passing through the ventilation passage 41
The cooling air can be sent out into the room by being cooled by contact with 2a.

As described above, in the air conditioner of the present embodiment, the heat absorbing surface 42a of the heat source element 42 utilizing the Peltier effect is disposed inside the ventilation passage 41 and the heat radiation surface 42b is disposed outside the ventilation passage 41. And the heat radiating surface 42b using cooling water.
By adjusting the temperature of the heat absorbing surface 42 to a predetermined temperature,
Since the temperature of a is set to the desired temperature and the room air is cooled by using the desired temperature, reliable and stable temperature control can be performed. Further, since the temperature can be controlled by switching between opening and closing of the three-way valve 54, the temperature of the heat absorbing surface 42a can be appropriately set by changing the set temperature of the control means 56. For example, if the temperature set value is set to 2 ° C. higher, the temperature of the heat radiation surface 42b can be raised by 2 ° C., and as a result, the temperature of the heat absorbing surface 42a can be raised by 2 ° C.

Further, the air conditioner of the present embodiment does not discharge heat from the outdoor unit to the outside air unlike a commonly used air conditioner, so that reliable air conditioning can be performed regardless of the temperature of the outside air. Becomes For this reason, it can be operated reliably even in a region where the outside temperature is extremely high, such as a tropical region or a subtropical region.

Further, in this air conditioner, a circuit for supplying a DC voltage to the cooling device 42, a control circuit for the three-way valve 54,
Since it is composed of only a very simple circuit such as a drive circuit of the heat exchanger 49, the occurrence of failures and malfunctions is extremely small,
Maintenance work can be significantly reduced. Further, since the heat exchange fins 52 are provided on the heat absorbing surfaces 42a of the cooling devices 42, 42,..., The efficiency of heat exchange is improved, and efficient operation becomes possible.

Furthermore, in the above-described embodiment, an example has been described in which the three-way valve 54 is switched between open and closed in accordance with the temperature of the cooling water to maintain the temperature of the heat radiation surface 42b constant. Instead, the cooling water temperature may be kept constant by adjusting the cooling efficiency of the cooling water in the heat exchanger 49.

[0039]

As described above, in the heating device and the cooling device of the present invention, a radiator plate is provided at a point where heat is radiated by the Peltier effect, and a heat sink plate is provided at a point where heat is absorbed. By adjusting the temperature of one of the heat absorbing plates to control the other temperature to a desired temperature, stable and reliable cooling or heating can be performed.

In the air conditioner of the present invention, a plurality of cooling devices capable of cooling by utilizing the Peltier effect are disposed inside the ventilation passage for air conditioning, and the heat radiating surface of the cooling device is cooled by using cooling water. By maintaining a constant temperature, the temperature of the heat absorbing surface is stabilized at a desired temperature and the air in the ventilation passage is cooled, so that reliable and stable temperature control can be performed without being affected by the outside air temperature. .

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of a cooling device according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of an embodiment of a heating device according to the present invention.

FIG. 3 is a side view showing a configuration of an embodiment of an air conditioner according to the present invention.

FIG. 4 is a plan view showing a configuration of an embodiment of an air conditioner according to the present invention.

FIG. 5 is a perspective view showing a detailed configuration inside a ventilation path.

FIG. 6 is an explanatory diagram showing an example in which the air conditioner of the present embodiment is housed in one housing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling device 2,22 P-type semiconductor 3,23 N-type semiconductor 4,24 Heat-absorbing surface 5a, 5b, 25a, 25b Heat-radiating surface 6,26 DC power supply 7,27 Casing 8,28 Cooling pipe 9,29 Water pump 10 , 30 Heat exchanger 10a Fan 11, 31 Thermometer 12, 32 Control means 13, 33 Water storage tank 21 Heating device 41 Ventilation path 42 Cooling device 42a Heat absorbing surface 42b Heat radiating surface 43 Blower 44 HEPA filter 45 Drain pan 46 Sending pipe 47 Return Piping 48 Water pump 49 Heat exchanger 50 Water storage tank 52 Heat exchange fin 53 Bypass pipe 54 Three-way valve 55 Thermometer 56 Control means 57 Radiation chamber 58 Housing 59 Air inlet 60 Operation panel space

Claims (7)

[Claims] 1. A heat absorbing plate is installed at a point where heat is absorbed by a Peltier effect generated when a voltage is applied to two different types of conductors, and a heat radiating plate is installed at a point where heat is released, and the heat absorbing plate is cooled. In a cooling device that cools the object to be cooled by contacting the body, a means for adjusting the temperature of the heat sink to a predetermined temperature is provided,
A cooling device, wherein the temperature of the heat absorbing plate is controlled by adjusting the temperature of the heat radiating plate. 2. A heat absorbing plate is installed at a point where heat is absorbed by the Peltier effect, which is generated when a voltage is applied to two different types of conductors, and a heat sink is installed at a point where heat is radiated. A heating device that heats the body to be heated by being brought into contact with the heating body, wherein a means for adjusting the temperature of the heat absorbing plate to a predetermined temperature is provided;
A heating device, wherein the temperature of the heat sink is controlled by adjusting the temperature of the heat absorbing plate. 3. An air conditioner for adjusting an indoor temperature, wherein a heat absorbing plate is provided at a point where heat is absorbed by a Peltier effect when voltage is applied to two different types of conductors, and
A cooling device for cooling the air to be cooled is provided by installing a heat sink at a point where heat is radiated, and bringing the heat absorbing plate into contact with the air to be cooled. Air supply means for discharging cooling air obtained into the room, a cooling medium in contact with a heat sink of the cooling device to cool the heat sink, and temperature control for adjusting the temperature of the cooling medium to a desired temperature. An air conditioner comprising: means. 4. An air conditioner for maintaining a room temperature at a substantially constant level, comprising: a ventilation path for air conditioning; an air supply means for circulating indoor air through the ventilation path; A heat absorbing plate is installed at the point where heat is absorbed by Peltier effect, and
A cooling device that cools the circulating air by installing a heat radiating plate at a point where heat is radiated, and bringing the heat absorbing plate into contact with the circulated air, A radiator plate disposed outside the ventilation path, a coolant pump, a coolant pipe for circulating a coolant delivered by the coolant pump to cool the radiator plate, and a coolant pipe An air conditioner, comprising: a heat exchanging means installed at an appropriate place for decreasing the temperature of the coolant. 5. The cooling liquid pipe includes a feed pipe for sending the cooling liquid to the radiator plate, and a return pipe for returning the cooling liquid passing through the radiator plate to the coolant pump side. Temperature detecting means for measuring the temperature of the coolant after contacting the heat sink is provided, and a bypass pipe for bypassing the heat sink and the bypass pipe are provided between the feed pipe and the return pipe. 5. An opening / closing valve, comprising: means for adjusting the opening of the on / off valve in accordance with the temperature detected by the temperature detecting means, and controlling the temperature of the heat sink to be constant. An air conditioner as described. 6. A temperature detecting means for measuring a temperature of a coolant after coming into contact with the heat radiating plate, and means for controlling the heat exchanger so as to make the detected temperature a desired temperature. The air conditioner according to claim 4, characterized in that: 7. The heat absorbing plate disposed inside the ventilation path,
7. The air conditioner according to claim 4, further comprising fins for improving cooling efficiency of air in the ventilation path.