KR20140083400A - drying device using heat pump - Google Patents

Abstract

The present invention relates to a drying device using a heat pump and, more specifically, to a drying device using a heat pump capable of increasing dehumidifying and drying efficiency by performing dehumidification and heating, using a heat pump after conducting a heat exchange between air flowing out from a drying room with outside air. The drying device using a heat pump according to the present invention includes a circulation duct for connecting an air inlet and an air outlet to make the air flowing out from the air outlet of the drying room circulate through the air inlet of the drying room; a heat pump including an evaporator installed inside the circulation duct for removing moisture in the air flowing inside the circulation duct, a compressor installed outside the circulation duct to absorb evaporative latent heat from the evaporator to compress evaporated refrigerant, a condenser installed inside the circulation duct to heat the air passed through the evaporator by condensing the gaseous refrigerant compressed by the compressor, and an expansion valve installed outside the circulation duct to expand the refrigerant condensed by the condenser; and an outdoor air heat exchange unit for conducting the heat exchange between the air discharged from the air outlet and the outside air.

Description

Drying apparatus using a heat pump (drying device using heat pump)

The present invention relates to a drying apparatus using a heat pump, and more particularly, to a drying apparatus capable of increasing dehumidification and drying efficiency by exchanging heat with hot air discharged from a drying chamber and then using a heat pump to perform dehumidification and heating .

In general, thermal energy is obtained by burning a combustible material or by using electricity, chemical action, or reaction. Methods of obtaining thermal energy by such combustion, action, and reaction are such that the obtained heat energy is stored in a heat storage device or converted into a usable state and then used as a means for drying, cooling, heating or heating.

The combustion method requires the provision of a combustible material and the necessity of an apparatus for combusting the combustible material because it is necessary to obtain heat energy while burning, and there is a problem of generation and discharge of environmental pollutants due to burning of the combustible material. The method of obtaining the thermal energy by the electrical and chemical action is significantly less pollutant generation than the method of burning the combustible material. However, in order to obtain a large amount of heat energy because it requires a substance or apparatus for reaction There is a problem in that the volume of the apparatus is increased, and there is a problem that the apparatus for the apparatus is complicated and large, because safety must be provided, and there is a problem that the heat energy to be obtained is smaller than the volume of the facility.

A heat pump is known as one capable of solving the above-mentioned problems.

The heat pump absorbs heat in the air and compresses it in the compressor to generate a high temperature compressed gas including the shaft force to raise the temperature of the water or to heat the heat exchanged condensation heat to the atmosphere. Is the same as the refrigeration cycle using the evaporation heat, and is constituted by the reverse cycle using the condensation heat in the high temperature maintenance.

Korean Patent Publication No. 2009-0116680 is known as a technique of applying such a heat pump system to a dehumidifying and drying machine.

A heat pump dehumidifying and drying apparatus using air as a heat source is advantageous in that it can be configured as a heat pump system by relatively simple structure such as a compressor, a condenser, an evaporator, an expansion valve, and a fan.

In such a heat pump dehumidifying and drying machine, dehumidification is performed by cooling the air in the evaporator by condensing the water vapor in the air, and the dehumidified cold air is heated using a condenser to introduce the hot dry air into the drying chamber, . At this time, the amount of heat radiated through the condenser is larger than the amount of heat absorbed through the evaporator by the amount of the compressor, so that the temperature of the drying chamber increases with time. Therefore, in order to keep the temperature of the drying chamber constant, it is necessary to discharge some of the heat generated from the condenser to the outside, but in this case unnecessary energy waste occurs. In addition, there is a problem that the heat discharge through the introduction of the outside air lowers the dehumidifying ability and the drying efficiency.

The present invention has been made in order to overcome the above problems, and it is an object of the present invention to provide a dehumidifying and drying method in which dehumidification is performed by heating the air using all the heat generated in a condenser, To the drying apparatus.

According to an aspect of the present invention, there is provided a drying apparatus using a heat pump, the drying apparatus including a drying chamber for supplying hot air to a drying chamber to dry the drying object stored in the drying chamber, A circulation duct connecting the air inlet and the air outlet so as to be circulated to the air inlet of the drying chamber; An evaporator installed in the circulation duct to remove moisture in the air flowing through the circulation duct, a compressor installed outside the circulation duct to compress refrigerant evaporated by absorbing the latent heat of evaporation from the evaporator, A condenser for condensing the gaseous refrigerant compressed by the compressor and heating the air passing through the evaporator, and an expansion valve installed outside the circulation duct for expanding the refrigerant condensed by the condenser, Wow; And an outside air heat exchange unit for exchanging the air flowing out through the air outlet with the outside air.

The outdoor heat exchanging unit includes an outdoor air inlet pipe connected to one side of the circulation duct for introducing outdoor air into the heat exchanger, a heat exchanger installed inside the circulation duct and in contact with the air flowing out through the air outlet, A blower connected to the outside air inlet pipe to supply outside air to the heat exchanger and an outside air outlet pipe connected to the other side of the circulating duct and through which the outside air passing through the heat exchanger flows out.

Wherein the heat exchanger is provided with a plurality of heat exchange pipes which are installed in the circulation duct so as to cross the circulation duct and communicate with the outside air inflow pipe at one end and communicate with the outside air outflow pipe at the other end, And a guide for guiding the flow of air passing through the periphery of the heat exchange pipe in the upper and lower directions is disposed inside the circulation duct between the adjacent heat exchange pipes.

As described above, according to the present invention, since the hot and humid air discharged from the drying chamber is heat-exchanged with the outside air and then cooled in the evaporator, the temperature of the drying chamber can be kept constant by heating the air using all the heat generated in the condenser Dehumidification and drying efficiency can be improved.

FIG. 1 is a schematic view showing the construction of a drying apparatus using a heat pump according to an embodiment of the present invention,
Fig. 2 is a perspective view excerpted from the main part of Fig. 1,
3 is a cross-sectional view of Fig.

Hereinafter, a drying apparatus using a heat pump according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, the drying apparatus using the heat pump according to the present invention mainly includes a circulating duct 10, a bottom pump, and an outside air heat exchange unit 30. As shown in FIG.

The circulating duct (10) is connected to the drying chamber (5). A drying object to be dried is stored in the drying chamber (5). Agricultural products and aquatic products can be applied to the building. The drying chamber (5) is provided with an air inlet (7) through which high temperature dry air flows, and an air outlet (9) through which humid air containing moisture evaporated from the drying object flows out.

One end of the circulating duct 10 is connected to the air inlet 7 and the other end of the circulating duct 10 is connected to the air outlet 9. Therefore, the air for drying the object to be dried has a circulation structure that flows into the air inlet 7 of the drying chamber through the circulating duct 10, flows out through the air outlet 9, and then flows into the circulating duct 10 again.

A hard pump is provided to introduce hot air into the drying chamber (5).

The heat pump includes an evaporator 21, a compressor 23 for compressing the evaporated refrigerant by absorbing the latent heat of evaporation from the evaporator 21, a condenser 25 for condensing the gaseous refrigerant compressed by the compressor 23, And an expansion valve 27 installed between the condenser 25 and the evaporator 21 for expanding the refrigerant condensed by the condenser 25. The refrigerant forms a closed circuit refrigeration cycle which is circulated to the evaporator 21, the compressor 23, the condenser 25, the expansion valve 27, and the evaporator 21.

In the present invention, the evaporator (21) and the condenser (25) of the heat pump are installed inside the circulating duct (10). The evaporator 21 is arranged closer to the air outlet 9 of the drying chamber than the condenser 25. Therefore, the air discharged through the air outlet 9 of the drying chamber 5 passes through the evaporator 21 and then through the condenser 25.

The evaporator 21 cools the humid air discharged through the air outlet 9 of the drying chamber to remove moisture in the air. The condenser 25 heats the dry air that has passed through the evaporator 21. The present invention utilizes all the heat radiated from the condenser 25 to heat the air. At the front end of the condenser 25, a fan 24 for blowing air in the direction of the condenser is provided. The high-temperature dry air having passed through the condenser 25 flows into the drying chamber 5 through the air inlet 7 of the drying chamber 5.

The high-temperature dry air introduced into the drying chamber (5) dries the laundry. In this process, moisture is evaporated from the object to be dried, and the evaporated moisture is contained in the air and discharged through the air outlet (9).

The outdoor heat exchanging unit (30) exchanges heat with the outside air through the air outlet (9) to cool the air discharged from the drying room (5) first. The air cooled by the heat exchange with the outside air is cooled secondarily through the evaporator (21). When the outdoor heat exchanging unit is provided as described above, the temperature of the air passing through the evaporator can be lowered to a lower degree than in the case where the outdoor heat exchanging unit is not provided, and the dehumidifying effect can be increased.

The outside air heat exchanging unit 30 includes a heat exchanger 40 installed inside the circulating duct 10 to be in contact with the air flowing out through the air outlet and a heat exchanger 40 for introducing the outside air into the heat exchanger 40 An outside air inflow pipe 31 connected to one side of the circulating duct 10, a blower 50 connected to the outside air inflow pipe 31 to supply the outside air to the heat exchanger 40, And an outside air outlet pipe (35) connected to the other side and through which the outside air passing through the heat exchanger (40) flows.

The heat exchanger (40) is made up of a plurality of heat exchange pipes (41). The heat exchange pipe 41 has a structure in which the inside is hollow and both ends are open. The heat exchange pipe 41 is made of a metal material such as copper having a high thermal conductivity. The heat exchange pipe (41) is installed in the circulating duct (10) so as to cross the circulation duct (10). One end of the heat exchange pipe (41) communicates with the outside air inflow pipe (31) and the other end communicates with the outside air outflow pipe (35). The plurality of heat exchanging pipes 41 are arranged up and down.

The hot air discharged through the air outlet 9 passes through the heat exchanger 40 and comes into contact with the heat exchange pipe 41. The hot air is brought into contact with the heat exchange pipe 41 and is heat-exchanged with the cool outside air to be primarily cooled and moved toward the evaporator 21.

The outside air inflow pipe 31 is connected to one side of the circulating duct 10 to introduce outside air into the heat exchanging pipe 41. The outside air outflow pipe (35) is installed on the side of the circulation duct (10) opposite to the outside air inflow pipe (31). The outside air inflow pipe (31) and the outside air outflow pipe (35) are formed in a square shape, and their cross sections are the same size as the circulating duct (10). One end of the heat exchange pipe (41) communicates with the flow path of the outside air inflow pipe (31), and the other end communicates with the flow path of the outside air outflow pipe (35).

The outside air is introduced into the outside air inflow pipe 31 through the blower 50. [ The outside air flowing into the outside air inflow pipe 31 is heat-exchanged with the hot air discharged from the drying room 5 through the heat exchange pipe 41. The heat-exchanged outside air is discharged to the outside through the outside air outflow pipe (35).

In order to increase the heat exchange efficiency between the high-temperature air flowing out from the drying chamber and the outside air, the present invention may further include a guide portion.

The guide part disperses the flow of air passing around the heat exchange pipe 41 or forms a vortex to increase the residence time and increase the contact ratio with the heat exchange pipe 41 to improve the heat exchange efficiency.

In the illustrated example, the guide portion is disposed between the upper and lower adjacent two heat exchange pipes 41 to guide the flow of air passing around the heat exchange pipe 41 in the upper and lower directions.

The guide portion includes a base panel 60, a top guide portion 61 formed to protrude upward in the base panel 60 and forming a curved surface, a lower guide portion 61 formed to protrude downward from the base panel 60, (63). The upper guide portion 61 and the lower guide portion 63 are formed on the base panel 60 at regular intervals. The upper guide portion 61 and the lower guide portion 63 protrude between the left and right adjacent heat exchange pipes 41.

The high temperature air discharged from the drying chamber 5 by the guide portion does not pass through the heat exchanger 40 in a straight flow but is distributed vertically so that the residence time is increased and the contact ratio with the heat exchange pipe 41 is increased . Therefore, the heat exchange efficiency can be greatly improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention. . Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

5: drying chamber 10: circulating duct
21: Evaporator 25: Condenser
30: outdoor heat exchange unit 31: outdoor air inlet pipe
35: Outer air outlet pipe 40: Heat exchanger
50: blower

Claims (3)

A drying apparatus for drying hot air stored in a drying chamber by supplying hot air to a drying chamber,
A circulation duct connecting the air inlet and the air outlet so that the air flowing out through the air outlet of the drying chamber can be circulated to the air inlet of the drying chamber;
A compressor installed inside the duct to remove moisture in the air flowing through the duct, a compressor installed outside the duct for compressing refrigerant evaporated by absorbing the latent heat of evaporation from the evaporator, A condenser for condensing the gaseous refrigerant compressed by the condenser and heating the air passing through the evaporator, and an expansion valve installed outside the duct for expanding the refrigerant condensed by the condenser;
And an outside air heat exchanging unit for exchanging the air flowing out through the air outlet with the outside air. The air conditioner according to claim 1, wherein the outdoor heat exchanging unit includes a heat exchanger installed inside the circulation duct and in contact with the air flowing out through the air outlet, and a heat exchanger connected to one side of the circulation duct for introducing the outdoor air into the heat exchanger And an outside air outlet pipe connected to the other side of the circulation duct and through which the outside air passing through the heat exchanger flows out. Drying apparatus using heat pump. The heat exchanger according to claim 1, wherein the heat exchanger is installed in the circulation duct so as to cross the circulation duct, one end communicated with the outside air inlet pipe, the other end communicating with the outside air outlet pipe, Respectively,
Wherein a guide portion for guiding the flow of air passing through the periphery of the heat exchange pipe in the upper and lower directions is disposed in each of the heat exchange pipes vertically adjacent to the inside of the circulation duct, .

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