JP2005042975A - Dehumidifier and dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently discharge heat generated due to power loss of a drive circuit. <P>SOLUTION: The dehumidifier discharges heat generated by a drive circuit 107 from a second heat exchanger 108 provided in an air duct 100 to the air duct 100, thereby efficiently discharging the heat generated due to power loss of the drive circuit 107 and operating stably while being small in size and weight. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dehumidifier that is used for business use and general household use and that reduces indoor humidity, and a dryer that dries various items including clothing.

Conventionally, as this type of dehumidifier and a dryer for clothing using the dehumidifier, as shown in FIG. 9, a rotating drum 2, a motor 3, a blower 22, a circulation duct 18, An evaporator 23, a condenser 24, a compressor 25, a squeezing device 26, and an inverter circuit 32 are provided. While the compressor 25 is driven by the inverter circuit 32, an object to be dried 21 such as laundry put in the rotary drum 2. The air as shown by the arrow is applied to the fan 22 by the blower 22, the air dehumidified by the evaporator 23 is guided to the condenser 24, and is circulated again as dry air in the rotary drum 2, and a part of the dry air is discharged from the exhaust port. The structure which discharges | emits from 28 to the exterior is shown (for example, refer patent document 1).
JP 7-178289 A

  However, in the dehumidifier and the dryer having the above-described conventional configuration, there is no particular description of a method for preventing the power loss of the inverter circuit 32 that drives the compressor 25, that is, the drive circuit of the compressor 25, and suppressing the temperature rise. Similarly to a normal electronic circuit, it is considered that heat is radiated into the air in the main body 1 by natural air cooling using an aluminum radiator (heat sink) or the like.

  Here, since the main body 1 is a sealed space, it is difficult to effectively dissipate the heat of the inverter circuit 32. For this reason, for example, the temperature of a power semiconductor element often used as a component of the inverter circuit 32, In order to suppress the value to a value that allows stable operation, there has been a problem that the size and weight of the heatsink are increased and the price is increased.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a dehumidifier and a dryer that operate stably while effectively releasing heat generated by a power loss generated by a drive circuit while being small and light.

  In order to solve the above problems, a dehumidifier of the present invention drives a first heat exchanger provided in a ventilation path, an electric motor that supplies a low-temperature substance to the first heat exchanger, and the electric motor. A drive circuit, wherein the first heat exchanger cools and dehumidifies air passing through the ventilation path, and heat generated by the drive circuit is generated from the second heat exchanger provided in the ventilation path. The heat is dissipated to the ventilation path.

  As a result, the heat generated by the power loss of the drive circuit is effectively dissipated, and a dehumidifier that operates stably while being small and lightweight is realized.

  As described above, the dehumidifier of the present invention is configured such that the heat generated by the drive circuit is dissipated to the ventilation path from the second heat exchanger provided in the ventilation path. It effectively dissipates the heat generated by, and operates stably while being small and lightweight.

  The invention according to claim 1 includes a first heat exchanger provided in the ventilation path, an electric motor that supplies a low-temperature substance to the first heat exchanger, and a drive circuit that drives the electric motor, The first heat exchanger cools and dehumidifies air passing through the ventilation path, and the heat generated by the drive circuit is radiated from the second heat exchanger provided in the ventilation path to the ventilation path. Thus, it is possible to effectively dissipate heat generated by power loss of the drive circuit, and to realize a dehumidifier that operates stably while being small and lightweight.

  The second aspect of the present invention is the second heat exchanger of the dehumidifier according to the first aspect of the present invention by providing the second heat exchanger downstream of the first heat exchanger of the ventilation path. The heat exchanger can be reduced in size and weight so that the apparatus can be reduced in size and weight.

  Invention of Claim 3 has the 1st heat exchanger provided in the ventilation path, the electric motor which supplies a low-temperature substance to the 1st heat exchanger, and the drive circuit which drives the electric motor, The first heat exchanger cools and dehumidifies the air passing through the ventilation path, and the heat generated by the drive circuit is radiated to the substance from the second heat exchanger provided in the substance passage. In this way, heat radiation to a substance having a particularly low temperature can be realized with a small size and light weight, so that further miniaturization and weight reduction of the device can be realized.

  According to a fourth aspect of the present invention, in particular, the second heat exchanger of the dehumidifier according to the third aspect is provided upstream of the first heat exchanger in the material passage, so that the first heat exchange is performed. As for the heat exchanger, the temperature of the passing material tends to rise slightly, so a slight design change may be necessary. However, with regard to the size of the second heat exchanger, heat is released to the lowest temperature part. Since it can be realized, it can be minimized, and the cooling effect of the drive circuit can be particularly great.

  According to a fifth aspect of the present invention, the second heat exchanger of the dehumidifier according to the third aspect of the present invention is provided downstream of the first heat exchanger in the material passage, thereby providing the second heat exchange. Since the temperature of the material passing through the vessel is slightly higher, the shape and weight of the second heat exchanger will be slightly larger, but the size of the material passing through the first heat exchanger can be kept low, so the size has been added. The need to do can be almost zero.

  According to a sixth aspect of the present invention, there is provided a first heat exchanger provided in the ventilation path for transferring heat from air to water, and a first heat exchanger for transferring heat from water heated by the first heat exchanger to a low-temperature substance. 3, an electric motor that supplies the low-temperature substance, and a drive circuit that drives the electric motor, and heat generated by the drive circuit is generated from the second heat exchanger that is provided in the ventilation path By adopting a structure for radiating heat to the ventilation path, heat due to loss of the drive circuit can be effectively released to the air.

  According to a seventh aspect of the present invention, there is provided a first heat exchanger provided in the ventilation path for transferring heat from air to water, and a first heat exchanger for transferring heat from water heated by the first heat exchanger to a low-temperature substance. 3, an electric motor that supplies the low-temperature substance, and a drive circuit that drives the electric motor, and the heat generated by the drive circuit is from a second heat exchanger provided in the passage of the substance By adopting a structure that radiates heat to the substance, heat due to loss of the drive circuit can be effectively released to the substance, and a high cooling performance of the drive circuit can be obtained.

  According to an eighth aspect of the present invention, there is provided a first heat exchanger that is provided in the ventilation path and transfers heat from air to water, and a first heat exchanger that transfers heat from water heated by the first heat exchanger to a low-temperature substance. 3, an electric motor that supplies the low-temperature substance, and a drive circuit that drives the electric motor, and the heat generated by the drive circuit is from a second heat exchanger provided in the water passage By adopting a structure that dissipates heat to the water, heat due to loss of the drive circuit can be effectively released to the water.

  The invention described in claim 9 has a fourth heat exchanger provided downstream of the first heat exchanger in the ventilation path of the dehumidifier according to any one of claims 1 to 8, and the fourth heat By configuring the exchanger to return the heat from the material that has absorbed heat by the first heat exchanger back to the air in the ventilation path, the air that has been cooled by the first heat exchanger and whose temperature has decreased is recycled. Heated and cold air can be prevented from coming out.

  The invention described in claim 10 is particularly reliable with respect to heat generation by providing the drive circuit of the dehumidifier according to claims 1 to 9 with an inverter circuit that outputs variable AC power to the motor. As a result, it is possible to effectively cool the inverter circuit, which is a problem, and to realize a small size and light weight and at the same time high reliability.

  The invention described in claim 11 has a drying chamber for storing the object to be dried, and the dehumidifier according to claims 1 to 10, and dehumidifies the air in the drying chamber to dry the object to be dried. By adopting such a configuration, it is possible to effectively dissipate the heat generated in the drive circuit and increase the temperature of the air supplied to the drying chamber that supplies the object to be dried, thereby realizing a device with high drying performance. Is.

  Embodiments of the present invention will be described below with reference to the drawings.

(Example 1)
FIG. 1 is a configuration diagram of a dehumidifier in a first embodiment of the present invention. In FIG. 1, a refrigerant R134a is used in a copper refrigerant pipe 103 in this embodiment as a low-temperature substance 102 in a first heat exchanger 101 and a first heat exchanger 101 provided in an air passage 100. The compressor 104 includes an electric motor 105 and a refrigerant pump 106, and supplies the first heat exchanger 101 by circulating the substance 102 through the refrigerant pipe 103.

  The electric motor 105 is driven and stopped by the drive circuit 107, and three-phase AC power having a variable frequency is output to the electric motor 105, so that the rotational speed is varied according to the time. Incidentally, the electric motor 105 uses a permanent magnet, and the rotational speed is determined in proportion to the frequency of the input AC power. While receiving the AC power having a constant frequency of 100 V 50 Hz or 60 Hz, which is a commercial power source, The variable speed electric motor 105 can be driven.

  The second heat exchanger 108 made of aluminum and having many pleats is provided downstream of the first heat exchanger 101 in the ventilation path 100. Further, the ventilation path 100 has a fourth heat exchanger 109 and a throttle valve 110 further downstream of the second heat exchanger 108. The fourth heat exchanger 109 is a first heat exchanger. Heat is absorbed by 101, and further, heat is returned to the air in the ventilation path 100 from the substance 102 that has been compressed by the compressor 104 to become high temperature and pressure. The blower fan 111 generates an air flow in the ventilation path 100.

  With the above configuration, in the dehumidifier of the present embodiment, the first heat exchanger 101 once cools the air passing through the ventilation path 100 and causes dew condensation to dehumidify the heat generated by the drive circuit 107. Radiates heat to the ventilation path 100 from the second heat exchanger 108 provided in the ventilation path 100, and finally the air in the ventilation path 100 is further heated by the fourth heat exchanger 109 and blows out from the outlet on the right side. It has become.

  FIG. 2 shows a detailed circuit diagram of the drive circuit 107 of this embodiment. The drive circuit 107 receives an AC power supply 120 of 100 V, 50 Hz or 60 Hz, and generates a DC voltage VDC having a no-load voltage of about 280 V by a choke coil 121, a full-wave rectifier bridge 122, and electrolytic capacitors 123 and 124. In addition, a six-stone inverter circuit 128 for converting the DC voltage VDC into AC again and making the motor 105 variable in frequency and variable in voltage is provided.

  In this embodiment, the inverter circuit 128 is composed of IGBTs (Insulated Gate Bipolar Transistors) 131, 132, 133, 134, 135, 136, all of which have an anti-parallel diode element between the collector and emitter. It has become.

  The gate terminals and emitter terminals of the IGBTs 131, 132, 133, 134, 135, and 136 are connected to a control circuit that controls on / off, respectively, and an on / off signal is input according to the rotor position of the motor 105. However, it is omitted in FIG.

  In the present embodiment, the rectifier bridge 122 and the inverter circuit 128 cause a large power loss as compared to the case where the capacitor run type induction motor is controlled on and off using a relay or a triac.

  And most of the loss power 30 W of the drive circuit 107 at the time when the input power from the AC power supply 120 is 600 W is generated in the rectifier bridge 122 and the inverter circuit 128.

  In the present embodiment, the rectifying bridge 122 and the IGBTs 131, 132, 133, 134, 135, and 136 are attached to the second heat exchanger 108.

  Therefore, since the amount of air passing through the ventilation path 100 is as large as 2.4 cubic meters per minute, the second heat exchanger 108 can be configured with a relatively small aluminum radiator, and is small and lightweight. The device can be realized.

  In particular, in the present embodiment, the second heat exchanger 108 is provided in a portion of the first heat exchanger 101 that contacts the downstream side of the ventilation path 100, so that it is cooled by the first heat exchanger 101. Since the air whose temperature has fallen hits the second heat exchanger 108, heat is radiated from the second heat exchanger 108 very well, and the temperature of the components of the drive circuit 107 can be sufficiently suppressed even with a small-sized one. Thus, a configuration that can ensure reliability can be obtained.

  On the other hand, when the second heat exchanger 108 is provided upstream of the first heat exchanger 101 in the ventilation path 100, the air that has entered from the entrance of the apparatus remains as it is. 108, which is disadvantageous in terms of sufficient cooling. However, if the airflow is still sufficient, the effect can be expected, and may occur when the temperature is too low. There is no need to worry about problems such as a decrease in the withstand voltage of a semiconductor element.

(Example 2)
FIG. 3 is a configuration diagram of a dehumidifier in the second embodiment of the present invention. In FIG. 3, the electric motor 105 that is a constituent element of the compressor 104 equivalent to that in the first embodiment is driven by the drive circuit 140, and the first heat exchanger 101 in the passage of the substance 102. The second heat exchanger 141 configured to be in contact with the copper refrigerant pipe 103 is provided upstream of the second heat exchanger 141.

  Therefore, the heat generated by the power loss of the drive circuit 140 is radiated from the second heat exchanger 141 to the substance 102. The drive circuit 140 is the same as the drive circuit 107 of the first embodiment, and the configuration other than the above is the same as that of the first embodiment.

  In the present embodiment, the second heat exchanger 141 is provided between the throttle valve 110, which is a portion where the temperature is particularly low, and the inlet of the first heat exchanger 101, so that the structure is particularly small in volume and weight. There is an effect that heat generated by power loss of the drive circuit 140 can be released to the substance 102.

(Example 3)
FIG. 4 is a configuration diagram of a dehumidifier in the third embodiment of the present invention. 4 also includes the drive circuit 140 and the second heat exchanger 141 that have the same circuit configuration as in the second embodiment, but the position to be provided is the first heat exchanger 101 in the passage of the substance 102. The point which exists in the downstream of this differs from Example 2. Other configurations are the same as those in the second embodiment.

  In the present embodiment, the temperature of the substance passing through the second heat exchanger 141 is higher than that in the second embodiment, but still compared with the outlet portion of the first heat exchanger 101 in the ventilation path 100. Since the temperature is slightly lower, heat generated by the power loss of the drive circuit 140 is effectively radiated to the substance.

  In this embodiment, unlike the second embodiment, the low-temperature substance 102 that has come out of the throttle valve 110 enters the first heat exchanger 101 as it is, which is advantageous in terms of dehumidification performance. There is an effect that the design can be performed.

(Example 4)
FIG. 5 is a configuration diagram of a dehumidifier in the fourth embodiment of the present invention. In FIG. 5, a first heat exchanger 150 and a third heat exchanger 151 are provided, and the first heat exchanger 150 has an action of transferring heat from the air in the ventilation path 100 to the water 152. To do. The water 152 flows through the pipe 153 and circulates by the force of the pump 154, and the water 152 heated by the first heat exchanger 150 is the water 152 in the third heat exchanger 151. Heat is transferred from the material to the low-temperature substance 102.

  Compared to the configuration of the first embodiment in which heat is directly transferred from the air to the substance 102, the number of components is slightly increased and complicated, but the configuration of the first heat exchanger 150 can be realized with a simple configuration, for example, A structure is also possible in which a fountain that raises splashes or a shower-like splash is generated in the ventilation path 100 so that the heat in the air is absorbed by the water 152 and the water is collected in a structure like a cone. Therefore, for example, when air flowing into the ventilation path 100 is mixed with foreign matters such as agitation and lint, they can be purified and sent to the subsequent configuration.

  It should be noted that the dirty water 152 may be appropriately discarded and replaced with new water. For example, when used in a device that uses water from a water supply, such as a washing and drying machine for clothes, It is also possible to automatically supply clean water.

  On the other hand, in the configuration of the first embodiment, when the substance 102 is generally realized by a refrigerant such as chlorofluorocarbon, a large number of metal plates are provided on the copper pipe at a pitch of, for example, 15 FPI as the heat exchanger 101. However, in an atmosphere where foreign matter is mixed in the air, it may cause clogging and is not suitable for long-term use.

  The substance 102 is circulated by the compressor 104 including the electric motor 105 and is continuously supplied to the third heat exchanger 151.

  A drive circuit 107 for driving the electric motor 105 is provided, and the heat generated by the drive circuit 107 is radiated from the second heat exchanger 108 provided in the ventilation path 100 to the air in the ventilation path 100. Yes.

  In particular, in the present embodiment, the second heat exchanger 108 is provided on the downstream side of the first heat exchanger 150 in the ventilation path 100, so that the air cooled by the first heat exchanger 150 is the first heat exchanger 150. The heat exchanger 108 corresponds to the second heat exchanger 108, and the heat generated from the drive circuit 107 is sufficiently radiated even with a relatively small shape and weight.

  In addition, about another component, the thing equivalent to Example 1 is used and comprised.

(Example 5)
FIG. 6 is a configuration diagram of a dehumidifier in the fifth embodiment of the present invention. In FIG. 6, similarly to the fourth embodiment, the first heat exchanger 150 and the third heat exchanger 151 are provided, and the first heat exchanger 150 is the air in the ventilation path 100. Heat to water 152.

  The water 152 flows through the pipe 153 and circulates by the force of the pump 154, and the water 152 heated by the first heat exchanger 150 is the water 152 in the third heat exchanger 151. Heat is transferred from the material to the low-temperature substance 102. In this embodiment, the heat generated by the drive circuit 140 that drives the electric motor 105 is radiated from the second heat exchanger 141 provided in the passage of the substance 102 to the substance 102.

  In particular, in the present embodiment, since the second heat exchanger 141 is provided while reaching the third heat exchanger 151 from the throttle valve 110, the temperature is lowest in the circulation path of the substance 102. Since the heat generated from the drive circuit 140 is radiated to the portion, a sufficient heat radiation effect can be obtained even in the very small second heat exchanger 141, and the apparatus is reduced in size and weight. The effect will be improved.

(Example 6)
FIG. 7 is a configuration diagram of a dehumidifier in the sixth embodiment of the present invention. Also in FIG. 7, as in the fourth embodiment, the first heat exchanger 150 and the third heat exchanger 151 are provided, and the first heat exchanger 150 is the air in the ventilation path 100. Heat to water 152.

  In this embodiment, the heat generated by the drive circuit 158 that drives the electric motor 105 is radiated to the water 152 from the second heat exchanger 159 provided in the passage of the water 152.

  The configuration of the drive circuit 158 is the same as that of the first embodiment, that is, the circuit configuration shown in FIG. 2 is used, and the second heat exchanger 159 is disposed outside the copper tube 153. The copper plate is also provided in close contact, and the rectifier bridge 122, IGBT 131, 132, 133, 134, 135, and 136 are attached to the copper plate with screws.

(Example 7)
FIG. 8 is a block diagram of a dryer in the seventh embodiment of the present invention. In the main body 160, a drying chamber 161 constituted by a rotating drum and a motor 162 for rotating the drying chamber 161 are provided. The housed object 163 is in contact with the surrounding air while rotating in the heating chamber 161. It has a configuration.

  Note that this embodiment is a clothes dryer, and the object to be dried 163 is clothes such as a washed shirt. The air in the drying chamber 161 is guided to the blower fan 165 through the filter 164 provided behind the drying chamber 161.

  In this embodiment, the blower fan 165 is rotationally driven by the motor 162 in the same manner as the rotation of the drying chamber 161. The air enters the dehumidifier 170 from the blower fan 165 through the circulation duct 166.

  Then, the dry air is circulated from the outlet of the dehumidifier 170 to the drying chamber 161 again. With the above configuration, the air in the drying chamber 161 is dehumidified, and the object to be dried 163 is dried.

  In the present embodiment, the dehumidifier 170 having the configuration described in the first embodiment is used, and the first heat exchanger 101, the compressor 104, the throttle valve 110, and the fourth heat exchanger 109 are provided. A drive circuit 107 that is disposed and further drives an electric motor in the compressor 104 is attached to a second heat exchanger 108 provided in the ventilation path 100. Therefore, the heat generated by the power loss of the drive circuit 107 is effectively radiated to the air in the ventilation path 100 by the second heat exchanger 108.

  Particularly in a clothes dryer, if the temperature of the air at the outlet of the dehumidifier 170 is high, for example, about 70 ° C., an effective drying speed of the object to be dried 163 can be obtained, and drying is required. There is a tendency to perform an effective drying operation such as shortening the time.

  In this embodiment, the heat generated from the drive circuit 107 acts as reheating power for the air that has been dehumidified and lowered in temperature. Therefore, the dehumidifier is combined with the reheating by the fourth heat exchanger 109. The air temperature at the outlet of 170 is further slightly increased.

  However, if the temperature at the outlet of the heat exchanger 109 becomes too high at the stage where the drying has progressed, the drying is performed so that, for example, the temperature of the fourth heat exchanger 109 is kept within a certain range. It may be necessary to discharge part of the air from the exhaust port 171 to the outside.

  In the configuration of this embodiment, since heat generated from the drive circuit 107 is eventually discharged from the outlet of the dehumidifier 170, the amount of air discharged outside from the exhaust port 171 is further equal to the amount of heat generated by the drive circuit 107. Although there is a tendency to increase, according to experiments by the inventors, the heat generation amount of the drive circuit 107 is about 30 W while the input power of the device is 600 W, and the difference in the amount of air discharged from the exhaust port 171 is different. Was insignificant.

  Further, the water dewed and dehumidified by the first heat exchanger 101 in the dehumidifier 170 is discharged from the drain port 172 to the outside.

  In the present embodiment, the dehumidifier 170 is configured as in the first embodiment. However, other configurations may be used. For example, as in the fourth embodiment, the first heat exchanger 150 temporarily transfers heat to the water 152. It does not matter if it is something.

  In general, a refrigerant such as Freon is often used for the substance 102, but in the case of water 152, the first heat exchanger 150 is less likely to escape due to evaporation or the like even if it is open. In addition, even if it runs away and decreases, replenishment can be performed easily, so in the case of a washing and drying machine, water supply is also available, so it is possible to use relatively clean water used for the final rinse, for example It becomes convenient.

  In addition, in a clothes dryer, lint from the material to be dried 163 is generated, but by using the third heat exchanger 150, for example, shower-like water splashes. Since the first heat exchanger 101 can be realized even in a configuration that is generated in the ventilation path 100, the first heat exchanger 150 can be prevented from being clogged, and the yarn can be used even for a long period of use. It is possible to prevent a reduction in circulating air volume due to an increase in pressure loss of the ventilation path 100 due to waste.

  In each of the embodiments, the drive circuit has a configuration using six so-called IGBTs. However, the drive circuit is not particularly limited to this configuration, and uses a switching element such as a MOSFET. Non-phase output, for example, single-phase output inverter circuits, drive circuits with various circuit configurations such as those that simply control the motor on / off by using a triac without using an inverter, or those that vary the speed by phase control are considered. However, in any case, the effect of effectively releasing the heat generated when the electric motor is driven can be expected.

  In addition to the rectifier bridge 122, for example, heat from a circuit that generates a gate signal of each IGBT, or an auxiliary DC power source such as 5V or 15V is used from a circuit for generating the power source. This heat can also be effectively dissipated from the second heat exchanger 108 or the like.

  As the dryer, in the present embodiment, a configuration is described in which the drying chamber has a rotating drum that rotates on a horizontal axis for clothing, but such a configuration is not necessarily required. Even if it is for the same clothing, it may be one with a rotating drum rotating on a vertical axis, one with a rotating drum rotating on an oblique rotating shaft, etc. In short, anything which takes dry liquid by applying dry air to an object to be dried can be used.

  As the dehumidifier or dryer, the fan 111 and the blower 165 that move the air in the ventilation path 100 are also used. However, the heat generated from the drive circuit for the electric motors used for these also causes the constituent elements to be second. If attached to the heat exchanger together, it is possible to dissipate heat.

In each embodiment, the refrigerant R134a is used as the substance 102. However, this substance is not particularly required, and other types of chlorofluorocarbons or natural refrigerants such as CO ₂ may be used. It is not limited whether it is a gas or a liquid, and it may be a supercritical fluid or a solid, and it may be anything as long as heat can be taken in and out.

  Moreover, in each Example, what is called a refrigerating cycle is comprised, However, This structure is not limited, For example, after storing heat | fever once with a 1st heat exchanger, it discharge | releases heat again. It may be discarded as it is.

Configuration diagram of the dehumidifier in the first embodiment of the present invention Detailed circuit diagram of the drive circuit of the dehumidifier The block diagram of the dehumidifier in 2nd Example of this invention The block diagram of the dehumidifier in the 3rd Example of this invention The block diagram of the dehumidifier in the 4th Example of this invention Configuration diagram of dehumidifier in the fifth embodiment of the present invention The block diagram of the dehumidifier in the 6th Example of this invention The block diagram of the dryer in 7th Example of this invention Configuration diagram of conventional dryer

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Ventilation path 101,150 1st heat exchanger 102 Material 105 Electric motor 107,140,158 Driving circuit 108,141,159 Second heat exchanger 109 4th heat exchanger 128 Inverter circuit 150 3rd heat exchange Vessel 152 Water 161 Drying room 163 Dried object 170 Dehumidifier

Claims (11)

A first heat exchanger provided in the ventilation path; an electric motor that supplies a low-temperature substance to the first heat exchanger; and a drive circuit that drives the electric motor, wherein the first heat exchanger includes the first heat exchanger A dehumidifier that cools and dehumidifies the air passing through the ventilation path, and radiates heat generated by the drive circuit to the ventilation path from a second heat exchanger provided in the ventilation path. The dehumidifier according to claim 1, wherein the second heat exchanger is provided downstream of the first heat exchanger in the ventilation path. A first heat exchanger provided in the ventilation path; an electric motor that supplies a low-temperature substance to the first heat exchanger; and a drive circuit that drives the electric motor, wherein the first heat exchanger includes the first heat exchanger A dehumidifier that cools and dehumidifies the air passing through the ventilation path, and the heat generated by the drive circuit dissipates heat to the substance from a second heat exchanger provided in the substance passage. The dehumidifier according to claim 3, wherein the second heat exchanger is provided upstream of the first heat exchanger in the substance passage. The dehumidifier according to claim 3, wherein the second heat exchanger is provided downstream of the first heat exchanger in the substance passage. A first heat exchanger for transferring heat from air to water; a third heat exchanger for transferring heat from water heated by the first heat exchanger to a low-temperature substance; A dehumidifier having a motor for supplying the substance and a drive circuit for driving the motor, wherein heat generated by the drive circuit is radiated to the ventilation path from a second heat exchanger provided in the ventilation path. A first heat exchanger for transferring heat from air to water; a third heat exchanger for transferring heat from water heated by the first heat exchanger to a low-temperature substance; A dehumidifier having a motor for supplying the substance and a drive circuit for driving the motor, wherein heat generated by the drive circuit is radiated to the substance from a second heat exchanger provided in the passage of the substance. A first heat exchanger for transferring heat from air to water; a third heat exchanger for transferring heat from water heated by the first heat exchanger to a low-temperature substance; A dehumidifier having a motor for supplying the substance and a drive circuit for driving the motor, wherein heat generated by the drive circuit is radiated to the water from a second heat exchanger provided in the water passage. A fourth heat exchanger provided downstream of the first heat exchanger in the ventilation path, wherein the fourth heat exchanger again takes heat from the material that has absorbed heat by the first heat exchanger; The dehumidifier according to any one of claims 1 to 8, wherein the dehumidifier is returned to the air in the ventilation path. The dehumidifier according to any one of claims 1 to 9, wherein the drive circuit includes an inverter circuit that outputs variable AC power to the electric motor. A dryer having a drying chamber for storing an object to be dried and a dehumidifier according to any one of claims 1 to 10, wherein the object to be dried is dried by dehumidifying the air in the drying chamber.

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