JPH112421A - Heat-exchanging ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring the temperature of intake air close to the indoor temperature by providing two heat-exchangers with two fans such that the air supply direction can be reversed. SOLUTION: In the heat-exchanging ventilator comprising a Peltier element unit, a fan 4 on the heat absorbing side and a fan 5 on the heat discharging side are set with a forward rotational direction in winter warming season and the air is supplied in the direction shown by an arrow A. Cold outdoor air is passed through a heat discharging side heat-exchanger 3 and warm air is supplied into the room. Dirty warm air in the room is discharged through a heat absorbing side heat-exchanger 2 to the outdoors. Heat discharging side of the Peltier element unit 1 is cooled with the air flowing from the outdoors and the temperature Th thereat is dropped whereas the temperature Tc on the heat absorbing side is raised by the warm air flowing out from the indoors. On the contrary, the heat absorbing side fan 4 and the heat discharging side fan 5 are set with a reverse rotational direction in summer cooling season, and the air is supplied in the direction shown by an arrow B. More specifically, both cases can be dealt with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilator for ventilating a room and adjusting the temperature of air supplied to the room.

[0002]

2. Description of the Related Art Conventionally, indoor ventilation is performed by installing a ventilation fan on an outer wall of a house to discard dirty air inside the room outside the room. A heat exchange type ventilation fan which can perform ventilation while exchanging heat between them has come to be used. This is because, as shown in FIG. 5, the two flow paths, the intake flow path 51 and the exhaust flow path 52, are thin partition plates 5 containing a high chemical made of moisture.
It is configured so that it alternates every stage with 3 in between.
Fresh air outside the room is introduced into the intake passage 51 by an intake fan (not shown), and dirty air inside the room flows into the exhaust passage 52 by an exhaust fan (not shown). In addition, in the same figure, the code | symbol 54 shows the outer wall of a house. Since the two airs introduced into the heat exchange type ventilation fan flow across the partition plate, heat exchange is performed between air supplied to the room and air discarded in the room. For example, in summer, since the cooled air discarded from the cooled room and the warm air taken in from the outside perform heat exchange via the partition plate 53, the temperature of the air taken in from the outside is increased. Falls,
Therefore, it is possible to prevent the room temperature from rising due to ventilation.

[0003]

However, in the conventional heat exchange type ventilation fan, the air between the air supplied to the room and the air discarded outside the room in the short passage of the intake passage 51 and the exhaust passage 52. Since the heat exchange is performed, it is possible to prevent the room temperature from rising or lowering to some extent due to ventilation, but it has been difficult to bring the temperature of the air taken into the room close to the room temperature. As a small air conditioner, there is a thermoelectric converter using a Peltier element. As shown in FIG. 6 (a), a plurality of Peltier element units 1 are arranged, a heat conducting plate 55a and a heat absorbing fin 56a are provided on the heat absorbing side of the Peltier element unit 1, and the heat absorption of the Peltier element unit 1 is performed. A heat conduction plate 55b and a radiating fin 56b are installed on the sides of the fins 56a, and the fins 56a and 56b are respectively provided with a cool air fan 57a.
The air is sent by the hot air fan 57b, the cool air is sent into the room during cooling, and the hot air is sent into the room during heating. FIG. 6B shows a pair of thermoelectric conversion elements 1 which are the minimum units forming the Peltier element unit 1.
This shows the structure of P (hereinafter referred to as an element pair). An element pair 1P is a DC voltage in which an N-type semiconductor element 1a and a P-type semiconductor element 1b are connected in series, and the N-type semiconductor element 1a side is (+). It is known that when is applied, the connection portion 1c side of each of the semiconductors 1a and 1b becomes a heat absorbing portion (low temperature) and the other 1d and 1d becomes a heat radiating portion (high temperature). However, the thermoelectric conversion device using the Peltier element normally performs cooling and heating using only one of the heat absorbing portion and the heat radiating portion, and performs ventilation by simultaneously using the functions of both the heat absorbing portion and the heat radiating portion. Was not done.

The present invention has been made in view of the conventional problems, and uses both functions of a heat absorbing section and a heat radiating section of a thermoelectric conversion device using a Peltier element to perform ventilation and take in the room. It is an object of the present invention to provide a heat exchange type ventilator capable of bringing the temperature of air to be brought close to the temperature of a room.

[0005]

According to a first aspect of the present invention, there is provided a heat-exchange type ventilator, wherein a heat-absorbing heat exchanger is provided on one heat-absorbing surface of a Peltier element, and a heat-radiating heat exchanger is provided on the other heat-radiating surface. A heat exchanger is provided, and two blowers are provided for blowing air to the two heat exchangers, respectively, so that the blowing directions of the two blowers can be reversed, and the cold air outside can be exchanged on the heat radiation side. The process of taking in the room by warming it through the heat exchanger and discarding the warm air in the room outside through the heat absorbing side heat exchanger, and conversely, cooling the warm outside air through the heat absorbing side heat exchanger This enables both the processing of taking in the room and discarding the cold air in the room to the outside via the heat-radiating heat exchanger.

In the heat exchange type ventilator according to the second aspect, the heat exchange capacity of the heat radiation side heat exchanger is made larger than the heat exchange capacity of the heat absorption side heat exchanger, so that the efficiency of the Peltier element is increased. Things.

The heat exchange type ventilator according to the third aspect of the present invention controls the voltage applied to the Peltier element based on the temperature difference between the inside and outside of the room, thereby controlling the temperature of the air taken in from outside of the room. It is designed to approach the temperature of air.

Further, the heat exchange type ventilator according to the fourth aspect controls one or both of the air volume and the air blowing direction of the blower based on the temperature difference between the indoor and the outdoor to thereby reduce the amount of air taken in from the outdoor. The temperature is made to approach the temperature of the indoor air.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a heat exchange type ventilating apparatus according to an embodiment of the present invention, wherein 1 is a Peltier element unit, 2 is a heat absorbing side heat exchanger, 3 is a heat radiating side heat exchanger, and 4 is a blowing direction. Heat sink side fan that can be reversed, 5
Denotes a heat-dissipation-side fan capable of reversing the blowing direction, 6 denotes an indoor temperature sensor, and 7 denotes an outdoor temperature sensor. In addition, in the same figure, the code | symbol 54 shows the outer wall of a house. As an example of the heat absorbing side heat exchanger 2 and the heat radiating side heat exchanger 3, as shown in FIG. 2, a comb-shaped heat sink type heat exchanger is used. Efficiency is endothermic heat exchanger 2
In order to increase the heat exchange efficiency of the heat sink 3 of the heat sink 3, the number of teeth of the heat sink of the heat sink 3 is made larger than the number of teeth of the heat sink of the heat exchanger 2. The surface area is set to be larger than the surface area of the endothermic heat exchanger 2. The direction of rotation of the heat-absorbing side fan 5 is normal when the air rotates to discard air outside the room, and the direction of rotation of the heat-radiating fan 6 is normal when the air rotates to take air into the room. Turn direction. Therefore, in FIG. 1, the case where the blowing direction is indicated by an arrow A indicated by a solid line is the forward direction, and the case where the blowing direction is indicated by an arrow B indicated by a broken line is the reverse direction.

Next, the operation of the heat exchange type ventilator having the above configuration will be described. In winter, when the temperature of the outdoor air is low and the room is ventilated with heating,
Both the rotation direction of the heat absorption side fan 5 and the rotation direction of the heat radiation side fan 6 are set to the normal rotation direction, and the blowing direction is the direction of the solid arrow A in FIG. The cold air that has flowed in from the outside is heat-exchanged by the heat-dissipation-side heat exchanger 3 and is taken into the room as warm air. The dirty warm air in the room is heat-exchanged by the heat-absorbing heat exchanger 2 to become cool air and is discarded outside the room. In this case, the heat radiation side of the Peltier element unit 1 is the temperature T _h of cooled heat radiation side by the cold air flowing from the outdoor decreases, endothermic side temperature T _c of warmed by the warm air flowing out from the indoor heat absorption side rises temperature difference ΔT = T _h -T _c of the heat dissipation side and heat absorption side of the Peltier element unit 1 because the smaller. On the other hand, when ventilation is performed in the summer, that is, when the temperature of the outdoor air is high and the room is cooled, both the rotation direction of the heat absorption side fan 5 and the rotation direction of the heat radiation side fan 6 are set to reverse directions. The blowing direction is the direction of the dashed arrow B in FIG. The warm air that has flowed in from the outside is heat-exchanged by the heat-absorbing-side heat exchanger 2 and is taken into the room as cold air. Also,
The dirty cold air in the room is heat-exchanged by the heat radiation side heat exchanger 3 to become warm air and is discarded outside the room. In this case, the heat absorbing side of the Peltier element unit 1 is the temperature T _c of warmed by the warm air flowing from the outdoor heat-absorption increases, the heat radiation side is decreased temperature T _h of cooled heat radiation side by the cold air flowing out from the indoor since the temperature difference ΔT = T _h -T _c of the heat dissipation side and heat absorption side of the Peltier element unit 1 becomes small. Figure 3 shows the relationship between the temperature difference ΔT = T _h -T _c and efficiency of the heat dissipation side and heat absorption side of the Peltier element unit, as is clear from the figure, the Peltier element unit as the temperature difference [Delta] T is large Efficiency decreases. Also, element pair 1
The amount of heat absorption Q per P also decreases as ΔT increases. In the heat exchange type ventilator of the present embodiment, as described above, the temperature difference ΔT = T between the heat radiation side and the heat absorption side of the Peltier element unit 1
_{Since h} - _Tc can be reduced, the Peltier device unit can be used in a highly efficient temperature difference region.

FIG. 4 shows a control example of the above-mentioned heat exchange type ventilator. The temperature difference between the indoor temperature and the outdoor temperature obtained from the outputs of the indoor temperature sensor 6 and the outdoor temperature sensor 7 is shown. On the basis of ΔTk, the rotation direction, the air volume, and the applied voltage to the Peltier element of the heat absorption side fan 5 and the heat radiation side fan 6 are controlled. That is, when the temperature difference ΔTk between the indoor temperature and the outdoor temperature is −1 ° C. or less, the outdoor temperature is low. Warm through the heat-dissipating heat exchanger and take it into the room. Then, ΔT
If k is −5 ° C. or less, the applied voltage is increased and the fan airflow is increased. If ΔTk is −5 ° C. to −3 ° C., the applied voltage is set to be medium and the fan airflow is also set to be medium. ΔTk is −3 ° C. to −1
If the temperature is ℃, the applied voltage is lowered and the fan air volume is also reduced. On the other hand, when the temperature difference ΔTk between the indoor temperature and the outdoor temperature is 1 ° C. or more, the outdoor temperature is high. It is cooled through a heat exchanger and taken into the room. At this time, if ΔTk is 5 ° C. or more, the applied voltage is increased and the fan airflow is increased. If ΔTk is 3 ° C. to 5 ° C., the applied voltage is set to be medium and the fan airflow is also set to be medium. ΔT
If k is 1 ° C. to 3 ° C., the applied voltage is reduced and the fan air volume is also reduced. If ΔTk is −1 ° C. to 1 ° C., the Peltier element unit 1 is not operated, and only the air is blown.

As described above, according to the present embodiment, the two heat exchangers are each provided with a blower capable of reversing the direction of air flow, so that cold outdoor air is warmed through the heat-radiation side heat exchanger to be indoors. Take in and dispose of the warm air in the room outside through the heat absorbing heat exchanger, and conversely, cool the outside warm air through the heat absorbing side heat exchanger and take in the room and cool the indoor cold air. It is possible to perform both processes of discarding air to the outside of the room via the heat radiation heat exchanger, and further, based on the temperature difference ΔTk between the room temperature and the outside temperature,
Since the rotation direction, the air volume, and the applied voltage to the Peltier element of the heat-absorbing-side fan 5 and the heat-radiating-side fan 6 are controlled, the temperature of the air taken in from the outdoor can be made close to the temperature of the air in the room. The load on the air conditioner can be reduced. In addition, since the efficiency of the Peltier device is improved by utilizing the exhaust heat of the air discarded outside the room, there is an advantage that the system utilization efficiency is high. Further, in the thermoelectric converter using the Peltier element, when switching between the cooling and the heating, since the polarity of the applied voltage is switched while keeping the blowing direction constant, the heat exchange capability of the heat exchanger on the heat radiation side cannot be increased. However, in the present embodiment, since the heat radiation side and the heat absorption side are fixed, the temperature difference ΔT between the heat radiation side and the heat absorption side is further reduced by increasing the heat exchange capacity of the heat exchanger on the heat radiation side, Peltier element unit efficiency can be further improved.

In this embodiment, a comb-shaped heat sink type heat exchanger is used as the heat absorbing side heat exchanger 2 and the heat radiating side heat exchanger 3, but a fin type heat exchanger formed in a corrugated plate shape is used. Heat exchangers (radiation fins and heat absorption fins) may be used. In such a case, the efficiency of the heat exchange type ventilator is improved by making the heat exchange capacity of the heat exchanger on the heat radiation side larger than the heat exchange capacity on the heat absorption side by making the pitch of the heat radiation fins smaller than the pitch of the heat absorption fins. Can be improved. Further, in the above example, the temperature difference ΔTk between the indoor temperature and the outdoor temperature is set to the interval of 2 ° C., but the temperature difference is not limited to this, and may be appropriately determined according to the size of the ventilation device.
Alternatively, it is not always necessary to simultaneously change the Peltier element application voltage and the fan airflow by the temperature difference ΔTk.
For example, the Peltier element application voltage may be automatically controlled with respect to ΔTk, and the fan air volume may be manually controlled by the user.

[0014]

As described above, in the heat exchange type ventilator according to the first aspect, the heat absorption side heat exchanger is provided on one heat absorption surface side of the Peltier element, and the heat radiation side heat exchanger is provided on the other heat radiation surface side. A heat exchanger is provided, and two air blowers are provided for blowing air to the two heat exchangers, respectively, so that the air blowing directions of the two air blowers can be reversed, and the outdoor cold air can be passed through the heat radiation side heat exchanger. Warm the air into the room and dispose of the warm air inside the room through the heat absorbing heat exchanger. Conversely, cool the warm outside air through the heat absorbing heat exchanger and take it into the room. In addition, it is possible to improve the efficiency of the Peltier device by utilizing the exhaust heat of the air that is discarded outside, since both processes of discarding the cold air in the room outside through the heat-radiating heat exchanger can be performed. And the temperature of air taken in from outside The can be brought close to the temperature of the air in the room, it is possible to reduce the load of the room air conditioning.

Further, in the heat exchange type ventilator according to the second aspect, the heat exchange capacity of the heat radiation side heat exchanger is made larger than the heat exchange capacity of the heat absorption side heat exchanger, so that the efficiency of the Peltier element is further increased. Can be.

Further, in the heat exchange type ventilator according to the third aspect, the voltage applied to the Peltier element is controlled based on the temperature difference between the inside and outside of the room, so that the temperature of the air taken in from outside of the room is controlled. The temperature of the air can be quickly approached.

Further, in the heat exchange type ventilator according to the fourth aspect, since the air volume or the blowing direction of the blower is controlled based on the temperature difference between the indoor and the outdoor, the temperature of the air taken in from the outdoor can be controlled. The temperature of the room air can be accurately approximated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a heat exchange type ventilation device according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of the heat exchange ventilator according to the embodiment of the present invention.

FIG. 3 is a graph showing a relationship between a temperature difference between a heat radiating portion and a heat absorbing portion of the Peltier device, efficiency, and heat absorption.

FIG. 4 is a diagram showing a control method of the heat exchange type ventilation device according to the embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a conventional heat exchange type ventilation fan.

FIG. 6 is a diagram showing a configuration of a conventional thermoelectric conversion device using a Peltier element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Peltier element unit 2 Heat absorption side heat exchanger 3 Radiation side heat exchanger 4 Heat absorption side fan 5 Radiation side fan 6 Indoor temperature sensor 7 Outdoor temperature sensor

Claims (4)

[Claims] 1. A heat absorbing side heat exchanger is provided on one heat absorbing surface side of a Peltier element, and a heat radiating side heat exchanger is provided on the other heat radiating surface side of the peltier element. A heat exchange ventilator provided with a blower, wherein the two blowers are capable of reversing a blowing direction. 2. The heat exchange ventilator according to claim 1, wherein the heat exchange capacity of the heat radiation side heat exchanger is larger than the heat exchange capacity of the heat absorption side heat exchanger. 3. The heat exchange type ventilator according to claim 1, wherein an applied voltage to the Peltier element is controlled based on a temperature difference between inside and outside of the room. 4. The heat exchange type ventilator according to claim 1, wherein one or both of the air volume and the air blowing direction of the blower are controlled based on a temperature difference between the indoor and the outdoor.