JPS62186137A - Electronic dehumidifier - Google Patents

Abstract

PURPOSE:To provide an electronic dehumidifier capable of dehumidifying down to a low humidity, having a small size, a low noise and a low vibration by a method wherein air feeding suction ports are arranged at a cooling side and a radiation side, an ventilation passage through which air flows along cooling fins and radiation fins is formed and an ventilation means making an amount of air at the radiation side more than two times the amount of air at the cooling side is provided. CONSTITUTION:After dusts and stains are removed from air through a filter 8, the air flows from a suction port 51 at a cooling side to cooling fins 3 and from a suction port 52 at a radiation side along radiation fins 5. At this time, since a power supply is directly supplied to an electronic cooling element 1, the cooling plate 2 and the cooling fins 3 are cooled to a low temperature and the radiation plate 4 and the radiation fins 5 show a hot temperature. At this time, since a cross sectional area of ventilation passage between the cooling fins 3 is made less than 1/2 of a cross sectional area of an aeration passage between the radiation fins 5, the air passing between the cooling fins 3 can be cooled to a temperature less than a dew point and a dehumidifying operation can be performed. The dehumidified air is mixed with the hot air and then flowed out of the room through a fan 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic dehumidifier, and more particularly to a small electronic dehumidifier using a thermoelectric conversion element and suitable for dehumidifying to low humidity.

[Conventional technology]

Previously, JP-A-54-112549, JP-A-54-
As described in Japanese Patent Publication No. 113951, etc., a small, low-noise, low-vibration dehumidifier that utilizes an electronic cooling element is known.

Electronic cooling elements have the characteristic that when current is passed through them, one side becomes low temperature and the other side becomes high temperature. After cooling the air to below the dew point temperature on the low temperature side and dehumidifying it, the low temperature air is transferred to the high temperature side. Dehumidification can be achieved by heating the area. Therefore, there are no moving parts.

It is possible to manufacture a small dehumidifier with low noise and vibration.

[Problem that the invention seeks to solve]

However, conventional electronic dehumidifiers have the same air volume on the cooling side and the heat radiation side, so there is a problem in that they cannot dehumidify when the humidity is low.

Coefficient of performance (cooling capacity/
An example of input is shown in FIG. The vertical axis is the coefficient of performance, and the horizontal axis is the temperature difference between the cooling side and the heat radiation side of the electronic cooling element.The coefficient of performance is less than 1, and the larger the temperature difference, the smaller the coefficient of performance. In order to dehumidify to low humidity, it is necessary to lower the air temperature to a low temperature, but if the temperature difference is increased, the coefficient of performance decreases, the amount of heat absorbed on the cooling side decreases, and the air cannot be cooled to a low temperature. For example, when the temperature difference is 40° C., the coefficient of performance is 0.33, and the amount of heat released on the heat radiation side is three times the amount of heat absorbed on the cooling side. Therefore, if the air volume on the cooling side and the heat radiation side is the same, the temperature difference between the air on the heat radiation side and the air on the cooling side will be three times that of the air on the cooling side, and the temperature difference between the temperature on the cooling side of the electronic cooling element and the intake air will be 10'C. , inlet air temperature 27
In case of °C.

The limit is to lower the temperature to 17°C, and if the air has a dew point of 17°C or lower at 27°C, it will no longer be possible to dehumidify it.

The purpose of the present invention is to enable dehumidification down to low humidity, small size,
Our goal is to provide a low-noise, low-vibration electronic dehumidifier.

[Means for solving problems]

In order to achieve the above object, a cooling plate and a cooling fin are provided on the cooling side of the electronic cooling element, a heat sink and a radiation fin are provided on the heat radiation side of the electronic cooling element, and air is blown to the cooling fin and the radiation fin, respectively. Equipped with air blowing means to
Air suction ports for blowing air are provided on the cooling side and heat radiation side, respectively, and ventilation paths are formed through which air flows along the cooling fins and radiation fins, respectively, so that the air volume on the heat radiation side is equal to the air volume on the cooling side. The structure is equipped with ventilation means that increases the ventilation by more than twice the amount.

[Effect]

When electricity is applied to the electronic cooling element, one side becomes low temperature and the other becomes high temperature, so if a cooling plate and cooling fins are provided on the low temperature side and a heat sink and heat radiation fins are provided on the high temperature side and air is blown, the air will be cooled on the low temperature side. Dehumidified. However, it is necessary to lower the air temperature to a low temperature that allows dehumidification, and the cooling side air volume must be reduced. By the way, the coefficient of performance of an electronic cooling element is 1 or less, and the coefficient of performance decreases as the temperature difference between the cooling side and the heat radiation side increases. Therefore, it is necessary to lower the temperature on the heat radiation side, and it is better to increase the air volume on the heat radiation side.When power consumption and total air volume (cooling side air volume + heat radiation side air volume) are constant, and the intake air temperature is 27°C and the humidity is 60%. , the amount of dehumidified water when changing the air volume ratio (heat radiation side air volume/cooling side air volume) is the first
Shown in Figure 4. This shows that by setting the air volume ratio to 2 or more, it is possible to reliably dehumidify.

For this reason, air blowing ports are provided on the cooling side and the heat radiation side, and the air volume on the heat radiation side is set to be more than twice the air volume on the cooling side, so that dehumidification can be achieved down to low humidity.

〔Example〕

The present invention will be explained in detail below using the embodiments shown in FIGS. 1 to 12.

FIG. 1 is a sectional view showing an embodiment of the electronic dehumidifier of the present invention;
FIG. 2 is a sectional view taken along line A--A in FIG. 1.

In Figures 1 and 2, 1 is an electronic cooling element (details will be described later), 2 is a cooling plate attached to the cooling side of the electronic cooling element 1, 3 is a cooling fin attached to the cooling plate 2, and 4 is an electronic cooling element. A heat dissipation plate attached to the heat dissipation side of the cooling element 1, 5 is a heat dissipation plate 4
radiating fins 6 attached to the cooling fins 3 and the radiating fins 5;
8 is a water tank that stores dehumidified water, and 8 is a cooling side suction port 51.
and dust in the air sucked in from the heat radiation side suction port 52;
9 is a drain pan that collects dehumidified water falling from the cooling fins 3 and sends it to the water tank 7, 10 is a housing, and 22 is a thermostat that turns off the power when the temperature drops below a predetermined temperature. However, the cross-sectional area of the ventilation passage between the cooling fins 3 is set to less than one-half of the cross-sectional area of the ventilation passage between the radiation fins 5.

Hereinafter, the electronic cooling element 1 will be explained using FIG. 3. FIG. 3 is an enlarged view showing one embodiment of the electronic cooling device 1 shown in FIG.

The same parts as in FIG. 2 are indicated by the same reference numerals, and their explanation will be omitted here. In FIG. 3, 11 is an N-type semiconductor of the electronic cooling element 1, 12 is a P-type semiconductor, 13 is an electrical conductor, and 14 is an electrical conductor. When flowing, heat flow occurs in the direction in which electrons flow in the N-type semiconductor 11 and in the direction in which holes flow in the P-type semiconductor 12. Therefore, the cooling plate 2 becomes low temperature and the heat sink 4 becomes high temperature.

Next, the main electric circuit will be explained using FIG. 4.

FIG. 4 is a circuit diagram showing an example of the electric circuit of the electronic dehumidifier shown in FIG. 1, in which 15 is a switch, 22 is a thermostat,
23 is a protective fuse, and 24 is a fan motor that drives the fan 6 shown in FIG.

25 is an AD converter that converts AC power into DC power and supplies it to the electronic cooling element 1.

Next, the operation will be explained. When the switch 15 is closed, the fan 6 is driven by the fan motor 24, and the air is passed through the filter 8 to remove dust, m, etc., and then passed from the cooling side suction port 51 to the cooling fin 3, and then to the heat radiation side suction port 52. It flows along the radiation fins 5, passes through the fan 6, and flows out of the housing 10. At this time, since DC power is supplied to the electronic cooling element 1, the cooling plate 2 and the cooling fins 3 become low in temperature, and the heat sink 4 and the heat radiating fins 5 become high in temperature. Therefore, the air flowing along the cooling fins 3 exchanges heat with the cooling plate 2 and the cooling fins 3 to reduce humidity. At this time.

Since the cross-sectional area of the ventilation passage between the cooling fins 3 is set to 1/2 or less of the cross-sectional area of the ventilation passage between the radiation fins 5, the amount of air passing between the cooling fins 3 is less than 1/2 of the amount of air between the radiation fins 5. , air can be cooled to below the dew point temperature and dehumidified. #
Water droplets generated due to humidity fall onto the drain pan 9 due to gravity and are collected in the water tank 7. The dehumidified air is
It exchanges heat with the heat sink 4 and the heat sink fins 5, mixes with the high temperature air, and flows out through the fan 6 to the outside.

The temperature of the air passing through the filter 8 is a predetermined temperature (for example.

15° C.), the thermostat 22 opens and the fan motor 24. Power supply to the electronic cooling element 1 is stopped. Therefore, the temperature of the cooling plate 2 and the cooling fins 3 will not fall below 0° C. and frost will not form.

As shown in the third @, the electronic cooling element 1 is electrically connected in series and thermally connected in parallel, so it can be downsized by reducing the number of P-type and N-type semiconductors. Therefore, the cooling efficiency does not decrease. In addition, by reducing the air volume on the cooling side and increasing the air volume on the heat radiation side, the air temperature on the cooling side can be lowered, and dehumidification can be performed to a low temperature.
The temperature on the heat radiation side is also lowered, the electronic cooling element 1 can be used efficiently, and power is saved. Furthermore, since the only moving part is the fan, there is almost no vibration or noise at 1 gi.

In the above embodiment, the air volume ratio on the cooling side and the heat dissipation side is done by changing the ventilation passage cross-sectional area ratio, but by providing a baffle plate etc. that acts as ventilation resistance on the cooling side, the air volume ratio is set to 1 ventilation resistance ratio. The same effect can be obtained by mixing them. Moreover, although the dehumidified water is collected in the water tank 7, it may be drained to the outside from the drain pan 9 using a hose or the like. Furthermore, the thermostat 22 may be attached to the cooling plate 2 or the cooling fins 3 so that it closes when the temperature is above 0°C and opens when the temperature falls below 0°C.

Next, another embodiment of the present invention will be described using FIG. 5. In FIG. 5, the same parts as in FIG. 1 are indicated by the same reference numerals, and their explanation will be omitted here.

In FIG. 5, a cooling fin 3a is attached to the cooling plate 2, a radiating fin 5a is attached to the radiating plate 4, and a fan 6a, a water tank 7a for storing dehumidified water, and a cooling fin 3a are attached to the cooling plate 2. The drain pan 9a that sends the falling dehumidified water to the water tank 7a, the housing 10a, and the air dust that is sucked in from the cooling side suction port 18! A first filter 16 that removes dust, etc., a second filter 17 that removes dirt, dust, etc. from the air taken in from the heat radiation side suction port 19, an air discharge port 20, a fan cover 21, etc. are provided. Here, the cross-sectional area of the cooling side suction port 18 and the heat radiation side suction port 19 is such that the amount of air passing through the heat radiation side suction port 19 is greater than the amount of air passing through the cooling side suction port 18. As a result, the amount of air passing between the radiation fins 58 is made more than twice the amount of air passing between the cooling fins 38.

Next, the operation will be explained. When the electronic cooling element 1 and the fan 6a are energized, the air passes through the cooling side suction port 18, and after removing dirt and dust with the first filter 16, it passes through the cooling plate 2. It is cooled and dehumidified by the cooling fins 3a. The dehumidified low-temperature air is passed through the heat radiation side suction port 19 to the second filter 17 to remove dust.

After dust is removed, the air is mixed with the inflowing air, and is flown along the radiation fins 5a by the fan 6a, absorbs heat, and then flows out from the discharge port 20. The dehumidified water is collected from the drain pan 9a into the water tank 7a.

Therefore, in addition to the effect of the above embodiment, since the low temperature air cooled by the cooling fins 3a is sent to the heat radiation side, the temperature of the heat radiation plate 4 is lowered, and the temperature difference between the heat radiation plate 4 and the cooling plate 2 is lowered. This has the effect of reducing power consumption.

Next, still another embodiment will be described using FIGS. 6 and 7. FIG. 6 is a sectional view of an electronic dehumidifier showing still another embodiment of the present invention, and FIG. 7 is a sectional view taken along the line B--B in FIG. 6. In FIGS. 6 and 7, the same parts as in FIGS. 1 and 2 are indicated by the same symbols, and 2b is the electronic cooling element 1.
3b is a cooling fin attached to the cooling plate 2, 4b and a heat sink attached to the heat dissipation side of the electronic cooling element 1, 5b is a heat sink attached to the heat sink 4b, 26 is a heat sink A second heat dissipation fin attached to 4b,
27 is an air cooling side suction port, 28 is an air heat radiation side suction port, 29 is a cooling plate 2b, a heat sink plate 4b, and a housing 10.
3o is a ventilation guide.

Next, the operation in the case of FIGS. 6 and 7 will be explained.

When the electronic cooling element 1 and the fan 6 are energized, the air from which dust and m are removed by the filter 8 is.

It is supplied to the cooling side through the cooling side suction port 27 and to the heat radiation side through the heat radiation side suction port 28. The air on the cooling side is cooled and dehumidified by the cooling plate 2b and the cooling fins 3b, passes through the ventilation passage 29, mixes with the air taken in from the heat radiation side suction port 28, flows along the radiation fins 5b, and is then connected to the fan. It flows out through 6.

At this time, the second radiation fins 26 are cooled by the dehumidified, low-temperature air. Therefore, in addition to the effects of the embodiment shown in FIG. 5, the difference between the second radiation fins 26 and the air temperature increases, the cooling effect increases, and the power consumption of the electronic cooling element 1 can be further reduced. .

Next, still another embodiment will be described using FIG. 8 and FIG. 9. Fig. 9 is a sectional view of an electronic dehumidifier showing still another embodiment of the present invention, and Fig. 9 is a main electrical circuit diagram corresponding to Fig. 4 in the case of Fig. 8. In FIGS. 8 and 9, parts that are the same as those in FIGS. 1 and 4 are designated by the same reference numerals, and their explanation will be omitted here. In FIG. 8, a thermistor 31 for temperature detection is attached to the cooling fin 3, 32 to 35 in FIG. 9 are resistances, and 36 is a voltage Vl.

A comparator that compares v2 and sends out an output H+ and L6, 37 is a timer that is initialized at the falling edge of the output of the comparator 36 and sets the output to Hi after a certain period of time T;
8 is an AND element which sets the output to Hl only when the outputs of the comparator 36 and timer 37 are Hl, 39 is a switching transistor, and 40 is a relay for switching the electrode to the electronic cooling element 1.

Next, the operation will be explained. When the temperature of the air flowing along the cooling fins 3 becomes low, the cooling fins 3 become frosted and need to be defrosted periodically. Therefore, the temperature of the thermistor 31 that detects the temperature of the cooling fin 3 is set to a set value (for example,
0° C.), the voltage v2 becomes lower than the reference electricity Vl, and the output of the comparator 36 becomes Hl. In this state, when the elapsed time of the timer 37 reaches T, the output of the timer 37 becomes Hl, the output of the AND element 38 becomes Hl,
The coil of relay 4o is energized by transistor 39, and defrosting begins. When relay 40 is energized, ? l! The direction of the current flowing through the child cooling element 1 is reversed, and the cooling plate 2 and cooling fins 3, which had been on the cooling side, are heated.
The heat sink 4 and the heat sink fins 5 are cooled. Due to this amount of heating and the sensible heat of the air flowing through the cooling fins 3, the frozen frost within time T melts, becomes water droplets, falls into the drain pan 9, and is collected in the water tank 7. Once the frost has thawed,
When the temperature of the cooling fin 3 increases and the temperature detected by the thermistor 31 becomes higher than the set value (for example, 4° C.), V2 becomes higher than the reference voltage Vl (the output of the comparator 36 differs between Hl and Lo). , the output of the comparator 36 becomes LO.

Therefore, energization to the coil of relay 4o is stopped,
The current of the electronic cooling element 1 becomes the normal dehumidifying operation direction, and the timer 37 is initialized.

Therefore, dehumidification is possible even when the intake air temperature is low, and the time required for defrosting can be shortened.

In the embodiments shown in FIGS. 8 and 9, the amount of heat released by the electronic cooling element 1 and the sensible heat of the air are used to melt the frost, but during the melting of the frost, the amount of heat dissipated from the electronic cooling element 1 and the sensible heat of the air are used. The electricity supply may be stopped and only the sensible heat of the air may be used. in this case,
Although it takes longer to melt the frost, power consumption can be reduced because the power supply to the m pre-cooling element 1 is stopped.

Also.

Thermistor 3 attached to cooling fin 3 indicates the end of frost melting
1, but the time required for melting the frost may be measured in advance and controlled by a timer, and the same effect can be obtained.

Next, still another embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG. 10 is a sectional view showing still another embodiment of the present invention, and FIG. 11 is a main electrical circuit diagram according to FIG. 10, in which the same parts as in FIGS. 8 and 9 are designated by the same reference numerals. In Fig. 10, 3c is a cooling fin attached to the cooling plate 2, 6c is a fan, 7c is a water tank, 8c is a filter installed at the air suction port 44 to remove dust and dirt from the air, 9c is a drain pan, and 10c is a A housing, 41 is a solenoid that rotates 90'' when energized, 42 is a first baffle plate as a resistor provided on the rotating shaft of the solenoid 41,
43 is a second baffle plate as a resistor provided on the rotation axis of the solenoid 41 and shifted by 90'' from the first baffle plate 42;
45 is a thermistor for detecting the temperature of the intake air provided at the air suction port 44, 53 is a cooling side suction port, and 54 is a heat radiation side suction port.

In FIG. 11, 24c is the fan motor of the fan 6c, 46, 47, 48 are resistors, 49 is a timer that switches the output to Hl and Lo at fixed time intervals, and 50 is a solenoid 41.
It is a coil of Next, the operation will be explained. When the switch 15 is closed, the fan motor 24c and the electronic cooling element 1 are energized, and the air passes through the air suction port 44, and a portion of the air flows through the cooling side suction port 53 and along the cooling pipe #3c to be cooled. After dehumidification, the air passes through the heat radiation side suction port 54, flows along the radiation fins 5, mixes with the heated air, and is discharged from the housing loc by the fan 6c. Here, the amount of air flowing to the cooling fins 3C is restricted by the first baffle plate 42, and the temperature of the intake air decreases to less than half of the amount of air flowing to the radiation fins 5, and the temperature detected by the thermistor 45 is set. When the temperature drops below the value (for example, 15° C.), the output of the comparator 36 becomes Hi.

In this state, when the output of the timer 49 is Lo, the air flowing along the cooling fins 3c is dehumidified, but the temperature of the cooling fins 3c becomes 0° C. or lower, causing frost to form on the cooling fins 3c. When a certain period of time has elapsed and the output of the timer 49 changes to Hl, the output of the AND element 38 changes to Hl, and the relay 4
0 coil and the coil 50 of the solenoid 41 are energized, the heat radiation side and the cooling side of the electronic cooling element 1 are reversed, and the second baffle plate 43 rotates by 90@, and the heat radiation fin 5
The first baffle plate 42 releases the restriction on the amount of air flowing to the cooling fins 3c. Therefore, since the cooling plate 2 and the cooling fins 3c are heated, the frost melts, falls into the drain pan 9c, and is collected in the water tank 7c. On the other hand, the heat dissipation plate 4 and the heat dissipation fins 5 are cooled, and the air volume is less than half of the air volume of the cooling fins 3c, so that dehumidification is performed.

As described above, when the suction temperature is low, the electronic cooling element 1 is switched between the cooling side and the heat radiation side at regular intervals, and the air volume on the cooling side is always limited, so that frost does not form on the cooling fins 3c. Even in such cases, continuous dehumidification is possible.

Furthermore, the amount of heat required to melt the frost can be effectively used for cooling the heat radiation side of the electronic cooling element 1, resulting in power savings.

Next, still another embodiment of the present invention will be described using FIG. 12. FIG. 12 is a sectional view of an electronic dehumidifier showing still another embodiment of the present invention, in which the same parts as in FIG. 1 are designated by the same reference numerals. In FIG. 12, in addition to the water tank 7d, the housing 10d, and the air outlet 55, one side is an ionization electrode 57.

The other is provided with an ion wind generator 56 as a blower that applies a high voltage to the cooling fins 3 and the radiation fins 5 to generate ion wind. Therefore, the fan 6 in FIG.
is omitted.

Next, the operation shown in FIG. 12 will be explained. When a voltage is applied between the ionization electrode 57 of the ion wind generator 56, the cooling fins 3, and the radiation fins 5.

The air is ionized and taken in through the cooling side suction port 51 and the heat radiation side suction port 52, flows along the cooling fins 3 and the heat radiation fins 5, passes through the outlet port 55, and flows to the outside.

Here, when the electronic cooling element 1 is energized, the air flowing along the cooling fins 3 is cooled and dehumidified. Therefore, the same effect as in FIG. 1 can be obtained, and since there are no moving parts, there is no noise or vibration, and reliability is improved.

〔Effect of the invention〕

As explained above, according to the present invention, by reducing the air volume on the cooling side, it is possible to dehumidify to a low humidity level, and by increasing the air volume on the heat radiation side, it is possible to lower the temperature on the heat radiation side. The cooling element can be used efficiently and there is a power saving effect, and since the electronic cooling element has no moving parts, it has the advantage of being small, with low vibration, and low noise.

[Brief explanation of drawings]

1 to 12 are diagrams showing embodiments of the present invention, FIG. 1 is a sectional view showing an embodiment of the electronic dehumidifier of the present invention, and FIG. 2 is a sectional view taken along line A-A in FIG. 1. 3 shows an enlarged view of the electronic cooling element shown in FIG. 1, FIG. 4 shows an electric circuit diagram of the electronic dehumidifier shown in FIG. 1, and FIG. 5 shows another embodiment of the electronic dehumidifier of the present invention. 6 is a sectional view showing still another embodiment of the electronic dehumidifier of the present invention, FIG. 7 is a sectional view taken along line B-B in FIG. 6, and FIG.
9 is a main electric circuit diagram corresponding to FIG. 4 of FIG. 8, and FIG. 10 is a sectional view showing still another embodiment of the electronic dehumidifier of the present invention. 11 is a main electrical circuit diagram according to FIG. 10, FIG. 12 is a sectional view showing still another embodiment of the electronic dehumidifier of the present invention, and FIG. 13 is a temperature difference FIG. 14 is a performance curve diagram showing the coefficient of performance of the electronic cooling element when the ratio changes, and FIG. 14 is a performance curve diagram showing the amount of dehumidified water when the air volume ratio changes. 1...Electronic cooling element, 2.2b...Cooling plate, 3,3
a. 3b, 3c... cooling fin, 4, 4b... heat sink,
5゜5a, 5b...radiating fins, 6,6a, 6c...
・Fan, 7, 7 a, 7 c, 7 d - Water tank, 8, 16° 17... Filter, 9.9 a, 9
c...Drain pan, 10 + 10 a? 10
c y 10 d ...housing, 18.27,5
1,53...Cooling side suction port, 19°28.52.54
... Heat radiation side suction port, 56 ... Ion wind generator
11, -7 (and 1 other
Name) Measure 1 Fig. 30 Effect 4-ku/--Iden (；♀醊黍子3α--・Two-way T'74-n A t+-m-Heat radiation direction 5α--2bi(+shi1 Fin A 6α---7 Ann A 18 --- So published T shell ゛10gL force! Mouth A19
-m- direction E4:;! Ma'1oJLiroA tea 6th figure r1's box 8 figure vine 10 figure C ttc21 5 °--suE I? T! :Fin 5
3°---;Military P E°1 Tsui Knee L6C---77
7C, 5L+-ttQ% side'11jbJJ C certain 120 o--m-direction (docine anti-5---8 missing (shishifin 56--- ion repulsion occurred) broiled i 桔 1B mouth escape 菟(° C) Also rejected for a year.

Claims (1)

[Claims] 1. A cooling plate and a cooling fin attached to the cooling plate are provided on the cooling side of the electronic cooling element, a heat sink and a heat radiation fin attached to the heat sink are provided on the heat radiation side, and the cooling fin and the cooling fin are provided on the heat radiation side. In the electronic dehumidifier, the electronic dehumidifier is equipped with air blowing means for blowing air to each of the cooling side and the heat radiation side, and air inlets are provided for blowing air to the cooling side and the heat radiation side, respectively, and air flows along the cooling fin and the radiation fin, respectively. An electronic dehumidifier comprising a ventilation means that forms a ventilation path and makes the air volume on the heat radiation side twice or more than the air volume on the cooling side. 2. The electronic dehumidifier according to claim 1, wherein the ventilation means is achieved by making the cross-sectional area of the heat radiation side ventilation path at least twice the cross-sectional area of the cooling side ventilation path. . 3. The ventilation means is configured such that a resistor for increasing ventilation resistance is provided in the cooling side ventilation passage, and the resistor makes the cooling side ventilation resistance twice or more than the heat radiation side ventilation resistance. An electronic dehumidifier according to claim 1.