KR100762511B1 - Energy recovery ventilation having heat exchanger different pin pitch - Google Patents

Abstract

An energy recovery ventilation having heat exchangers with different fin pitch is provided to improve heat exchange efficiency by installing first and second heat exchange parts in series and to prevent lowering of air volume regardless of frosting deposits on air passages. An energy recovery ventilation having heat exchangers with different fin pitch comprises an air supply duct, a case(100), an air supply fan(210), a ventilation fan(200), a first heat exchange part(300), and a second heat exchange part(310). The air supply duct sucks outdoor air in and supplies air into an indoor space. The case includes a ventilation duct separated by a partition wall, sucks indoor air in and discharges indoor air to the outside. The air supply fan sucks in the outdoor air into the air supply duct of the case. The ventilation fan sucks in the indoor air into the ventilation duct of the case. The first heat exchange part forms a first air passage for the preliminary heat exchange between internal air inside the air supply duct and the air of indoor space. The second heat exchange part forms a second air passage(311) for the secondary heat exchange between the heat exchanged air from the first heat exchange part and the outdoor air. The fin pitch of the first air passage is larger than that of the second air passage, so as to prevent lowering of outdoor air inflow regardless of frost deposits on the second air passage.

Description

Energy recovery ventilation having heat exchanger with different fin pitch

1 is a cross-sectional view showing the configuration of a general waste heat recovery ventilator.

Figure 2 is a cross-sectional view showing the configuration of the waste heat recovery ventilator according to the present invention.

3 is a perspective view of a heat exchanger having different fin pitches of FIG. 2;

Figure 4 is a block diagram showing the configuration of the waste heat recovery ventilator of FIG.

5 is a cross-sectional view showing an operating state of the waste heat recovery ventilator of FIG.

(Explanation of symbols for the main parts of the drawing)

100: case 130: exhaust inlet

131: exhaust port 140: air supply

141: air supply outlet 200: exhaust fan

210: air supply fan 300: first heat exchange part

301: first air flow path 310: second heat exchange part

311: 2nd air flow path 400: bypass damper

500: temperature sensor 600: control unit

The present invention relates to a waste heat recovery ventilator, and more particularly, to a waste heat recovery ventilator having an improved heat exchange efficiency by installing a heat exchanger having a large fin pitch and a heat exchanger having a small fin pitch in series.

In general, the air in an enclosed space increases the content of carbon dioxide and various harmful substances with time by the breathing of the living being, which interferes with the breathing of the living.

Therefore, if many people stay in a confined space such as an office or a vehicle, the indoor polluted air should be replaced with fresh air from time to time.

At this time, a commonly used ventilation device. Most conventional ventilation apparatuses employ a method of forcibly discharging only indoor air to the outside using a single blower.

However, when forcibly discharging only the indoor air by using one blower, the indoor air is discharged to the outside without filtration and the outdoor air is introduced without heat exchange through a door or window gap, thereby heating and cooling the room. The cost of cooling was unnecessarily high.

In addition, the sudden cold air and heat flows from the outside to the inside of the indoor air due to the rapid temperature change, people in the room feels uncomfortable, especially when the indoor air outside the window or door frame closed only to the outside The inflow of fresh air is blocked and oxygen deficiency can occur, as well as the humidity control of the indoor air is not made at all, although there is a problem that does not maintain a comfortable indoor environment despite the ventilation device is provided.

In order to solve this conventional problem, a waste heat recovery ventilator has been proposed in which outdoor air is first heat-exchanged with indoor air discharged to the outside and then supplied to indoors.

1, the waste heat recovery ventilator is provided with an air supply duct 10 into which the outdoor air flows into the inside of the box-shaped duct 1, and intersects with the air supply duct at a predetermined position. The exhaust duct 20 is guided to the outdoor is provided.

A heat exchanger 30 is provided to exchange heat between the outdoor air that is supplied at the point where the air supply duct 10 and the exhaust duct 20 intersect and the indoor air that is exhausted.

At this time, the air supply duct 10 and the exhaust duct 20 are not interfered with each other by the partition wall 3 partitioning the inside of the duct 1 up and down.

An air supply suction opening 11 is formed at one end of the air supply duct 10 and an air supply outlet 13 is formed at the other end of the air supply duct 20. The inlet 21 is formed and the other end is formed with an exhaust outlet 23 in communication with the outdoors.

An air supply fan 15 for forcibly sucking outdoor air is provided at the air supply inlet 11 of the air supply duct 10, and an air exhaust fan for forcibly discharging indoor air at the exhaust outlet 23 side of the exhaust duct 20. 25 is provided.

On the other hand, the heat exchanger 30 has a hexahedral shape in which the upper and lower edges are supported by the duct 1 and the left and right edges are supported by the partition wall 3, and a plurality of air supply passages 37 communicating with the air supply duct 10 therein. ) And a plurality of exhaust passages 39 adjacent to the air supply passage 37 and communicating with the exhaust duct 20.

Although not separately shown in the drawings, a heat exchange plate having excellent heat conduction efficiency is provided at the boundary between the air supply passage 37 and the exhaust passage 39.

At this time, the portion shown by the solid line is the air supply passage 37, and the portion shown by the dotted line is the exhaust passage 39. The operation of the waste heat recovery ventilator having such a configuration is as follows.

First, when indoor air is contaminated to some extent, power is supplied to the exhaust fan 25 so that indoor air flows into the exhaust duct 20 through the exhaust inlet 21, and then the exhaust passage 39 of the heat exchanger 30. ) Is discharged to the outside through the exhaust outlet (23).

At the same time, while supplying power to the air supply fan 15, fresh outdoor air flows into the air supply duct 10 through the air supply inlet 11, and then passes through the air supply passage 37 of the heat exchanger 30. 13) is introduced into the room.

At this time, the indoor air and the outdoor air passing through the heat exchanger 30 will exchange heat through the heat exchange plate. In detail, the heat exchange in the heat exchanger 30 includes the sensible heat exchange between the supplied outdoor air and the exhausted indoor air, and the hot air in the indoor air or the outdoor air is below the dew point temp. It is made by the latent heat exchange by the condensate produced in the state of.

In the case of the heat exchange type ventilation device, the outdoor air supplied when the room is cooled or heated is primarily heat-exchanged with the indoor air and then introduced into the room, thereby preventing a rapid rise or fall of the room temperature.

However, the conventional waste heat recovery ventilator has a problem in that when the outdoor air is lowered below a predetermined temperature, frost is generated in the heat exchanger to perform defrosting operation of the heat exchanger through a separate heater.

In addition, when the outdoor temperature falls below a certain temperature, the air supply is stopped for a predetermined time and only the exhaust gas is operated to perform the defrost function, thereby preventing the heat exchange function.

In order to solve the above problems, an object of the present invention is to provide a waste heat recovery ventilator that is capable of defrosting operation without a separate defrost heater, so that the efficiency during heat exchange can be increased.

In order to achieve the above object, the present invention provides an air supply duct for sucking air from the outside to be supplied to the room, and an exhaust duct for sucking air from the room to be exhausted to the outside; An air supply fan that sucks outdoor air by the air supply duct of the case; An exhaust fan that sucks indoor air through the exhaust duct of the case; A first heat exchanger configured to form an air flow path between the air supply duct internal air of the case and the indoor air so as to perform primary heat exchange; And a second heat exchanger configured to form an air flow path so as to perform secondary exchange between the first heat exchanged air in the first heat exchanger and the outdoor air, and the outdoor air flows even when frost is generated in the air flow path of the second heat exchanger. The air flow path spacing of the second heat exchange part is larger than the air flow path spacing of the first heat exchange part so as to prevent a decrease in the amount of inflow.

In addition, the present invention is a temperature sensor for detecting the temperature of the outdoor air sucked into the second heat exchanger; A controller for outputting a control signal to bypass the indoor air to the second heat exchange part according to the temperature detected by the temperature sensor; And a bypass damper for allowing the indoor air to flow into the second heat exchange part according to the bypass control signal output from the controller.

The first and second heat exchange parts may be sensible heat exchange and latent heat exchange. Preferably, the first and second heat exchange parts are heat transfer elements.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a cross-sectional view showing the configuration of the waste heat recovery ventilator according to the present invention, Figure 3 is a perspective view showing a heat exchanger with different fin pitch of Figure 2, Figure 4 is a block diagram showing the configuration of the waste heat recovery ventilator of Figure 2 5 is a cross-sectional view showing an operating state of the waste heat recovery ventilator of FIG. 2.

2 to 5, the waste heat recovery ventilator includes a first exhaust duct part 110a, a second exhaust duct part 110b, and a first exhaust duct part 110 to suck air from the room into the rectangular case 100 and exhaust the air to the outside. An exhaust duct divided into three exhaust duct parts 110c, a first air supply duct part 120a, a second air supply duct part 120b, and a third air supply duct part 120c to suck air from the outside and supply air to the room And a first heat exchanger 300 and a second heat exchanger 310 for heat-exchanging the air duct, which is divided into the air duct, the air sucked into the exhaust duct and the air duct.

The case 100 allows the first to third exhaust duct portions 110a to 110b and the first to third air supply duct portions 120a to 120c to be partitioned by using a plurality of partitions.

That is, the first exhaust duct unit 110a and the third air supply duct unit 120c are partitioned through the first partition wall 150, and the first exhaust duct unit 110a and the second air supply unit are partitioned through the second partition wall 151. It is partitioned into the duct part 120b.

In addition, the second exhaust duct part 110b and the third air supply duct part 120c are partitioned through the third partition 152, and the second exhaust duct part 110b and the second exhaust duct part 110c are separated through the fourth partition 153. It is partitioned into the air supply duct part 120b.

In addition, the second exhaust duct part 110b and the first air supply duct part 120a are partitioned through the fifth partition wall 154, and the second air supply duct part 120b and the third hole are partitioned through the sixth partition wall 155. The exhaust duct part 110c is partitioned, and the third exhaust duct part 110c and the first air supply duct part 120a are partitioned through the seventh partition wall 156.

Meanwhile, the first heat exchange part 300 is installed at a position where the first and second exhaust duct parts 110a and 110b and the second and third air supply duct parts 120b and 120c intersect, and the second and third parts are provided. The second heat exchange part 310 is installed between the exhaust duct parts 110b and 110c and the first and second air supply duct parts 120a and 120b.

Therefore, the indoor air is sucked into the first exhaust duct part 110a by the exhaust fan 200 installed in the first exhaust duct part 110a through the exhaust inlet 130 installed at one side of the first exhaust duct part 110a. In addition, the sucked indoor air is moved to the first heat exchange part 300, the second exhaust duct part 110b, the second heat exchange part 310, and the third exhaust duct part 110c so that the third exhaust duct part is moved. It is to be exhausted to the outside through the exhaust port 131 installed on one side of (110c).

In addition, the air supply fan 210 installed in the third air supply duct unit 120c sucks outdoor air into the first air supply duct unit 120a through the air supply unit 140 installed at one side of the first air supply duct unit 120a. The suctioned outdoor air is moved to the second heat exchange part 310, the second air supply duct part 120b, the first heat exchange part 300, and the third air supply duct part 120c so as to move to the third air supply duct. Through the air supply outlet 141 installed on one side of the portion (120c) to be supplied to the room.

In this case, the first heat exchanger 300 and the second heat exchanger 310 generate heat exchange between the sucked outdoor air and the indoor air.

The first heat exchange part 300 includes a third air supply duct part (b) in the second air supply duct part (120b) in the process of moving the indoor air sucked into the first exhaust duct part (110a) to the second exhaust duct part (110b). The outdoor air moving to 120c is subjected to sensible heat exchange and latent heat exchange in the first air flow path 301. Preferably, the first heat exchange part 300 is a heat transfer element, and is made of paper or a nonwoven fabric. Use a heating element.

The second heat exchange part 310 is a third exhaust duct part (3) from the second exhaust duct part 110b in the process of moving the outdoor air sucked into the first air supply duct part 120a to the second air supply duct part 120b. The outdoor air moving to 110c causes the sensible heat exchange and the total heat exchange to be performed in the second air flow path 311. Preferably, the second heat exchange part 310 is a heating element, and is made of paper or a nonwoven fabric. Use a heating element.

Meanwhile, the size of the second air flow path 311 formed in the second heat exchange part 310 is greater than that of the first air flow path 301 formed in the first heat exchange part 300. This prevents a decrease in the amount of air flow even when the second air flow path 311 occurs in the heat exchange process with the hot indoor air due to the low temperature of the outdoor air.

In addition, by using the second heat exchange part 310 of the size of the second air flow path 311, that is, a large pin pitch P2, the heat exchange efficiency is slightly reduced, but the exchange of sensible heat (temperature) and latent heat (humidity) The outdoor air supplied to the air absorbs the heat of the indoor air exhausted to increase the temperature.

In addition, the first heat exchanger 300 having the size of the first air flow path 301, that is, the small fin pitch P1, is disposed in series with the second heat exchanger 310 so that the outdoor air supplied to the second air exchanger 310 is supplied. Heat exchange efficiency by performing a first heat exchange in the heat exchanger, and the outdoor air whose temperature is raised in the second heat exchanger 310 exchanges heat in the first heat exchanger 300 of the small fin pitch P1. To be increased.

Therefore, by performing heat exchange in the first and second heat exchange parts 300 and 310 for the first and second heat exchange, the outdoor air can absorb the energy of the indoor air through which the air is vented to the maximum.

In addition, the second heat exchanger 310 is a heat exchanger having a large fin pitch, and since sensible heat exchange and latent heat exchange are performed, much humidity is removed in the heat exchange process. However, in the winter when the external temperature is low, the amount of air to be sucked due to freezing of condensed water on the surface of the second heat exchange part 311 on the side of the first air supply duct part 120a or the occurrence of frost on the second air flow path 311 is reduced. It can also be a cause.

Therefore, in order to prevent this, the temperature of the outdoor air sucked into the bypass damper 400 and the first air supply duct unit 120a to allow the hot indoor air to be bypassed directly to the first air supply duct unit 120a in winter. It further includes a temperature sensor 500 for detecting the control unit 600 for controlling the operation of the bypass damper (400).

The bypass damper 400 is rotatably installed around the hinge shaft 410 on one side partition wall 157 of the case 100, and according to the bypass control signal output from the controller 600, the first air supply duct part It is opened and closed so that the interior 120a can directly communicate with the interior.

The temperature sensor 500 is installed inside the first air supply duct part 120a to detect a temperature of outdoor air sucked from the air supply unit 140, and outputs the detected temperature value to the controller 600.

The controller 600 compares the outdoor temperature detected by the temperature sensor 500 with a reference temperature for determining whether the bypass damper 400 is opened or closed, and according to the comparison result, the indoor air is supplied to the first air supply duct unit 120a. Outputs an open control signal of the bypass damper 400 or outputs a close control signal of the bypass damper 400 to be bypassed to the second heat exchanger 310 through.

That is, the controller 600 compares the outdoor temperature detected by the temperature sensor 500 with the reference temperature for the open / close determination of the bypass damper 400, and the detected temperature is lower than the reference temperature (for example, -0 ° C.). In this case, the open control signal is output to the bypass damper 400.

Therefore, by allowing the hot air in the room to flow into the first air supply duct part 120a, mixing with the cold outdoor air causes frost to occur on the surface 311 or the second air flow path 311 according to the heat exchange temperature difference. To prevent it.

Therefore, by installing a heat exchanger and a heat exchanger in which sensible heat exchange and latent heat exchange are performed in series in the waste heat recovery ventilator, it is possible to prevent the decrease in heat exchange efficiency due to frosting.

As described above, the present invention is the first heat exchange of the air sucked in the outdoor in the heat exchanger having a large fin pitch, and the second heat exchanger in the heat exchanger having a fin pitch smaller than the heat exchanger having a large fin pitch, There is an advantage that can increase the heat exchange efficiency.

In addition, the present invention has the advantage that it is possible to provide a stable heat exchange by preventing the amount of air flow is reduced due to the conception generated on the surface of the heat exchanger or the air flow path by using a heat exchanger having a large fin pitch.

In addition, the present invention has the advantage that it is possible to effectively remove the frost on the surface of the heat exchanger due to the temperature difference between the outdoor air and the outdoor air in winter to provide a stable ventilation.

In addition, by removing an unnecessary configuration, such as a separate drain or drainage device for draining defrost water, there is an advantage that the structure can be simplified.

Claims (3)

A case in which an air supply duct for sucking outdoor air and supplying air to the room and an exhaust duct for sucking air from the room and being exhausted to the outside are partitioned by partition walls; An air supply fan that sucks outdoor air by the air supply duct of the case; An exhaust fan that sucks indoor air through the exhaust duct of the case; A first heat exchanger configured to form an air flow path between the air supply duct internal air of the case and the indoor air so as to perform primary heat exchange; And And a second heat exchanger configured to form an air flow path so as to perform secondary exchange between the air primarily heat-exchanged in the first heat exchanger and the outdoor air. The heat exchange interval of the second heat exchange part is larger than the air flow path spacing of the first heat exchange part so as to prevent a decrease in the inflow rate of outdoor air even when an frost is generated in the air flow path of the second heat exchange part. Having waste heat recovery ventilator. According to claim 1, Temperature sensor for detecting the temperature of the outdoor air sucked into the second heat exchange unit; A controller for outputting a control signal to bypass the indoor air to the second heat exchange part according to the temperature detected by the temperature sensor; And And a bypass damper for allowing the indoor air to flow into the second heat exchange part according to the bypass control signal output from the controller. The waste heat recovery ventilator according to claim 1 or 2, wherein the first and second heat exchange parts are heat transfer elements in which sensible heat exchange and latent heat exchange are performed.

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