KR20210056709A - Compound Food Drying apparatus - Google Patents

Abstract

Disclosed is a complex food drying apparatus. According to the present invention, the complex food drying apparatus comprises: a drying housing having a drying chamber formed therein to dry a material to be dried and capable of being sealed from the outside; a temperature control unit provided inside and outside the drying chamber and capable of providing a low or high temperature to the inside of the drying chamber to selectively perform any one of a hot air drying function, a quick freeze-drying function, a low-temperature storage function, and a residual moisture removing function for the drying chamber; and a pressure control unit capable of adjusting the internal pressure of the drying housing. The temperature control unit includes a compressor, a first condenser provided in any one of a plurality of first branch pipes connected to the compressor, a second condenser connected to the plurality of first branch pipes through pipes, and a first evaporator provided in any one of the plurality of second branch pipes connected to the second condenser, and a second evaporator provided in the other of the second branch pipes connected to the second condenser. Accordingly, a condenser and an evaporator are provided in the drying chamber at the same time so that hot air drying and freeze-drying of food can be selectively performed. In particular, a plurality of evaporators having different heat exchange areas are provided and a plurality of expansion valves are applied to provide different degrees of expansion of a refrigerant, thereby separately performing the quick freeze-drying function and the low-temperature storage function.

Description

Compound Food Drying Apparatus

The present invention relates to a multi-purpose complex food drying apparatus capable of selectively performing a function of removing residual moisture in a drying room as well as hot air drying, quick freeze drying, and low temperature storage functions of food.

In general, conventional food dryers are classified into a hot-air drying method in which food is dried by heating air inside a drying chamber, and a freeze-drying method in which food is dried for a long time at a low temperature.

Here, in the case of the hot air drying method, hot air is supplied to the drying chamber or a heated fluid is supplied, and the food is heated to a high temperature to dry it. In the case of the freeze drying method, food is dried by maintaining the drying chamber at a low temperature for a long time.

In the case of food, if necessary, hot air drying or freeze drying is applied to perform drying.In general, dryers are machines that consume a large amount of energy in the drying process. Since the dryer must be provided separately, the cost incurred due to the increase in the number of dryers is greatly increased.

Therefore, the applicant of the present invention proposes a complex drying apparatus capable of sufficiently satisfying various drying conditions of food through a single complex dryer and reducing factors that increase the cost of the workplace.

Korean Patent Application Publication No. 10-2019-0094639 (published on August 14, 2019)

The present invention was conceived to solve the above-described conventional problems, and not only can selectively perform hot air drying, quick freeze drying, and low temperature storage functions of a dried product, but also a drying room residual moisture removal function. It is an object of the present invention to provide a complex food drying apparatus capable of drying more reliably.

According to an aspect of the present invention, a drying chamber is formed in the interior for drying the dry matter, and a drying housing that can be sealed to the outside; It is provided inside and outside the drying room, and has a low temperature inside the drying room to selectively perform any one of a hot air drying function, a quick freeze drying function, a low temperature storage function, and a residual moisture removal function in the drying room. A temperature control unit capable of providing a high temperature; And a pressure control unit capable of adjusting the internal pressure of the drying housing, wherein the temperature control unit includes: a compressor, a first condenser provided in any one of a plurality of first branch pipes connected to the compressor, a plurality of first branch pipes and pipes A second condenser connected through, a first evaporator provided in any one of a plurality of second branch pipes connected to the second condenser, and a second evaporator provided in the other of the second branch pipe connected to the second condenser. A complex food drying device is provided.

The first condenser, the first evaporator, and the second evaporator may be disposed inside the drying housing, and the compressor and the second condenser may be disposed outside the drying housing.

The first evaporator and the second evaporator may have a structure in which heat exchange areas are different from each other.

A first valve body for selectively opening a flow path is installed in the plurality of first branch pipes, and an expansion valve together with a second valve body for selectively opening a flow path is installed in the plurality of second branch pipes. I can.

The second evaporator has a structure having a relatively large heat exchange area compared to the first evaporator, and a plurality of expansion valves respectively installed in the plurality of second branch pipes are configured to perform different degrees of expansion of the refrigerant from each other, When the hot air drying function of the building is operated, only the first valve body of the first branch pipe in which a first condenser is installed among the plurality of first branch pipes is opened, and a second valve body in which a first evaporator is installed among the plurality of second branch pipes is opened. Only the second valve body of the branch pipe is opened, and when the rapid freeze drying function of the building is operated, only the first valve body of the first branch pipe without a first condenser among the plurality of first branch pipes is opened, and the Of the plurality of second branch pipes, only the second valve body of the second branch pipe in which the second evaporator is installed is opened, and when the low-temperature storage function of the building is operated, the first condenser is not installed among the plurality of first branch pipes. Only the first valve body of the first branch pipe is opened, and only the second valve body of the second branch pipe in which the first evaporator is installed among the plurality of second branch pipes is opened. Of the first branch pipes of the first branch pipe, only the first valve body of the first branch pipe with the first condenser installed may be opened, and of the plurality of second branch pipes, only the second valve body of the second branch pipe with the second evaporator installed may be opened. have.

The first evaporator and the second evaporator are disposed adjacent to each other to form an evaporator group, and the temperature control unit is disposed between the first condenser and the evaporator group facing each other so as to be able to blow air in a direction toward the evaporator group. It may further include one circulation fan.

According to the complex food drying apparatus of the present invention described above, hot air drying and freeze drying of food can be selectively performed by simultaneously providing a condenser and an evaporator in the drying chamber. By applying a plurality of expansion valves to make the degree of expansion different, quick freeze drying and low temperature storage functions can be classified and performed.

In addition, it is possible to perform the function of removing residual moisture in the drying chamber in the drying apparatus, and drying the dried material with a high moisture content can be efficiently dried by performing the drying of the dried material at a constant rate and then drying the dry matter.

In addition, by providing a defrosting unit to efficiently remove ice formed on the surface of the evaporator, it is possible to further improve the freeze-drying efficiency of food.

1 is a front perspective view showing a complex food drying apparatus according to an embodiment of the present invention,
FIG. 2 is a perspective view showing an open state of the door in FIG.
Figure 3 is a rear perspective view showing a complex food drying apparatus according to an embodiment of the present invention,
Figure 4 is a front cross-sectional view showing the internal structure of the complex food drying apparatus according to an embodiment of the present invention,
5 is a configuration layout diagram for controlling the temperature of the drying room of the complex food drying apparatus according to an embodiment of the present invention,
6 to 9 are diagrams showing refrigerant flow paths for performing hot air drying, quick freeze drying, low temperature storage functions, and residual moisture removal functions in a drying room in the complex food drying apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments make the disclosure of the present invention complete, and the scope of the invention to those of ordinary skill in the art It is provided to inform you. In the drawings, the same reference numerals refer to the same elements.

The complex food drying apparatus according to a preferred embodiment of the present invention is a multi-purpose drying apparatus capable of selectively performing hot air drying, quick freeze drying, and low temperature storage of dried products (hereinafter,'food', food, grain, agricultural and marine products, etc.). In addition, it is possible to perform the function of removing residual moisture in the drying room in the drying apparatus, and drying the dried material with a high moisture content can be efficiently dried by performing the drying of the dried material at a constant rate and then drying the dry matter.

Hereinafter, the present invention will be described in detail with reference to Examples.

1 to 5, the complex food drying apparatus according to an embodiment of the present invention includes a drying housing 100, a temperature control unit 200, and a pressure control unit 300.

First, the drying housing 100 forms a drying chamber 110 for drying food therein, and a main door 120 is provided for entry into the interior, such as for a worker. The drying housing 100 has a structure capable of sealing the drying chamber 110 to the outside, and accordingly, the pressure can be efficiently controlled when the internal pressure is controlled by the pressure control unit 300 to be described later.

In the drying housing 100, a support frame portion 130 formed by coupling a plurality of support frames 131 for supporting a tray (not shown) for supporting food is accommodated.

As shown in Figure 4, the support frame 130 is made of a substantially symmetrical structure with respect to the vertical frame 132 in the center, and the support frame 131 is vertical to support the tray (not shown) from the bottom. The frame 132 is installed in multiple stages on both sides. The inner region of the vertical frame 132 and the region around the support frame 131 communicate with each other so that air can flow. The support frame unit 130 has a separate interior accommodation space, and opens or seals the interior accommodation space to the outside (drying room in the drying housing), and a separate frame opening door 133 so that the worker places food on the top of the tray. ) Is installed.

The support frame part 130 is made of a structure in which one side is closed, the frame open door 133 is provided on the other side (the main door side of the drying housing), and the frame open door 133 is closed so that the support frame part 130 Heat generated from the temperature control unit 200 to be described later may be supplied into the support frame unit 130 in a state where the inner accommodation space is sealed to the outside.

As shown in Fig. 4, the temperature control unit 200 and the support frame unit 130 are connected by a duct 210 so that heat from the temperature control unit 200 can be transferred to food without loss of heat as much as possible, and details will be described later. do.

Next, as shown in Figs. 1 to 5, the temperature control unit 200 is provided inside and outside the drying room 110, and the high or low temperature inside the drying room to perform hot air drying, quick freeze drying, and low temperature storage functions of food. Can provide heat. In addition, in addition to these functions, heat of an appropriate temperature may be provided to perform the function of removing the residual level in the drying room (the above-described reduction rate drying).

That is, the present invention can perform various functions for drying and storing/storing food, and in addition, foods with high moisture content can also be used for complex purposes that can be more reliably dried through reduction rate drying.

As shown in Figure 5, the temperature control unit 200, the compressor 220, a first condenser 240 provided in any one of a plurality of first branch pipes 230 connected to the compressor 220, a plurality of A first evaporator 270 provided in any one of a second condenser 250 connected to the first branch pipe 230 and a pipe, and a plurality of second branch pipes 260 connected to the second condenser 250, A second evaporator 280 provided in the other of the second branch pipe 260 connected to the second condenser 250 may be included.

In the related drawings, a compressor, a first condenser, a second condenser, a first evaporator, and a second evaporator are formed as a group to form one cycle, and a case in which each of these components is provided in two sets is shown. However, the present invention is not limited thereto, and the number of components may be added according to the size of the drying housing 100, and will be described below based on one set for convenience of description.

Here, the first condenser 240, the first evaporator 270, and the second evaporator 280 are disposed inside the drying housing 100 to function as an indoor heat exchanger, and the compressor 220 and the second condenser 250 Is disposed outside the drying housing 100 and the second condenser 250 functions as an outdoor heat exchanger.

That is, in order to substantially dry food with hot air (providing high-temperature heat), rapid freeze-drying (providing low-temperature heat), low-temperature storage (providing low-temperature heat), and removing residual moisture in the drying room (providing medium-temperature heat), high temperature or An indoor heat exchanger that provides low or medium temperature heat is composed of one condenser and two evaporators, but is not limited thereto, and the number of evaporators may be higher. Hereinafter, for convenience of description, it will be described based on a case where two evaporators in the drying room are configured.

Incidentally, in the present invention, the first evaporator 270 and the second evaporator 280 have a structure having different heat exchange areas, as shown in FIG. , Ultra-low temperature (less than -30°C for rapid freeze drying), etc., can be differentially provided.If the number of evaporators is further increased as described above, the heat exchange area is configured to be different from each other and applied. I can.

In the exemplary embodiment of the present invention, the second evaporator 280 has a relatively longer refrigerant flow path than the first evaporator 270, resulting in a structure having a relatively large heat exchange area. While the liquid in the low-temperature and low-pressure state that has passed through the expansion valve passes through the evaporator and changes into a gas in the low-temperature and low-pressure state, it absorbs heat from its surroundings more, thereby providing heat of a lower temperature to the surroundings.

As shown in FIG. 5, a first valve body 231 for selectively opening a flow path is installed in the plurality of first branch pipes 230, and a flow path is selectively provided in the plurality of second branch pipes 260. A first expansion valve 262 and a second expansion valve 263 that rapidly expand the refrigerant that has passed through the second condenser 250 and change to a low temperature and low pressure state in addition to the second valve body 261 for opening to Each is installed. In addition, a separate liquid level gauge 264 is further installed in the second branch pipe 260 to check the flow state before the high-temperature, high-pressure liquid refrigerant that has passed through the condenser flows to the expansion valve.

Here, the first valve body 231 includes an electronic automatic valve 232 capable of automatically controlling the opening of the flow path and manual valves 233 on both sides of the electronic automatic valve 232. The second valve body 261 also includes an electronic automatic valve 232 and manual valves 233 installed on both sides thereof.

In an embodiment of the present invention, the first expansion valve 262 and the second expansion valve 263 provide different refrigerant conditions to the inlet sides of the first evaporator 270 and the second evaporator 280, that is, the degree of expansion of the refrigerant. The second evaporator 280 is configured to be implemented differently from each other and, as will be described later, the second evaporator 280 supplies relatively lower temperature heat to the drying chamber than the first evaporator 270.

For example, the first expansion valve 262 can be applied as a valve capable of having a refrigeration capacity of approximately 5R/T in a refrigeration device comprising a compressor, a condenser, an expansion valve, and an evaporator, while the second expansion valve 263 Is applicable as a valve that can have a refrigeration capacity of 2R/T.

In the present invention, the second evaporator 280 has a structure having a relatively large heat exchange area compared to the first evaporator 270, and the second expansion valve 263 is As the refrigeration capacity is applied as a valve having a specification to increase the refrigeration capacity, the amount of heat absorbed around the second evaporator is relatively increased to provide sufficient conditions for rapid freezing of the drying chamber.

4, in the embodiment of the present invention, the first evaporator 270 and the second evaporator 280 are disposed adjacent to each other to form an evaporator group 285, and the temperature control unit 200 is It further includes at least one circulation fan 290 disposed between the first condenser 240 and the evaporator group 285 disposed to face each other so as to be able to blow air in a direction toward the evaporator group 285. By driving the circulation fan, all of the heat generated from the first condenser, the first evaporator, and the second evaporator can be smoothly transferred to the food side accommodated in the support frame unit 130.

When explaining the path through which such low or high temperature heat is transmitted to the food, as shown in FIG. 4, the upper part of the vertical frame 132 is opened and connected through the evaporator group 285 and the duct 210, and similarly, the evaporator The group 285 and the first condenser 240 are connected through a duct 210 and at least one circulation fan 290 is installed in the duct 210. Accordingly, heat formed around the first condenser, the first evaporator, and the second evaporator can be smoothly transferred to food after flowing into the vertical frame 132 along the duct 210 by driving the circulation fan 290.

As described above, the present invention connects the first condenser 240, the evaporator group 285, and the support frame unit 130 with a duct 210 and installs a circulation fan 290 in the duct 210, thereby 1 The heat generated by the condenser 240 and the evaporator group 285 can be transferred to the food side as much as possible, thereby further increasing food drying and storage efficiency.

3 and 5, the pressure control unit 300 is provided to adjust the internal pressure of the drying housing 100.

The pressure control unit 300 is for substantially depressurizing the interior of the drying chamber 110, and since the interior of the drying chamber 110 is in an atmospheric pressure state, a phenomenon in which indoor air is expanded due to a pressure difference occurs and prevents this. The pressure control unit 300 can be applied as a decompression pump and discharges the air in the drying chamber 110 to the outside by the decompression pump, thereby lowering the pressure inside the drying chamber 110, thereby expanding the air in the drying chamber and circulating the air. This can be active. On the other hand, as described above, hot air drying, quick freeze drying, and low temperature storage functions can be selectively performed by the driving control of the temperature control unit 200, and the functions of removing residual moisture in the drying room can also be selectively performed. During execution, the pressure inside the drying chamber 110, that is, the driving of the pressure control unit 300, can be variably changed in order to increase the functional effect.

That is, it is possible to variably adjust the pressure inside the drying room according to the implementation of each function, and for this purpose, the control unit (not shown) is the pressure control unit 300, based on the valve opening/closing signal for individual execution of each function, as described below. That is, it is possible to adjust the driving pressure of the pressure reducing pump.

Hereinafter, a control method for individually implementing various functions of the drying chamber 110 will be described.

First, as shown in FIG. 6, when the hot air drying function of a building is operated, the control unit (not shown) of the first branch pipe 230 in which the first condenser 240 is installed among the plurality of first branch pipes 230 The valve is opened and closed so that only the first valve body 231 is opened and only the second valve body 261 of the second branch pipe 260 in which the first evaporator 270 is installed among the plurality of second branch pipes 260 is opened. Control. At this time, the refrigerant discharged from the compressor 220 sequentially passes through the first condenser 240, the second condenser 250, the first expansion valve 262, and the first evaporator 270, while The heat absorption of the first evaporator 270, which has a relatively small amount of heat absorption compared to the second evaporator 280, increases the amount of heat to the area, and the hot air of about 25 to 65 degrees is delivered by driving the circulation fan 290. It can be delivered to the hot air drying. Here, the hot air drying temperature control may be performed through variable control of the pressure of the drying chamber 110 by driving the pressure control unit 300 described above, control of a compressor drive rpm, and control of the opening degree of the first expansion valve 262.

Next, as shown in FIG. 7, when the quick freeze drying function of the dry matter is operated, the control unit (not shown) includes a first branch pipe in which the first condenser 240 is not installed among the plurality of first branch pipes 230 ( To open only the first valve body 231 of the 230), and open only the second valve body 261 of the second branch pipe 260 in which the second evaporator 280 is installed among the plurality of second branch pipes 260 Control valve opening and closing. At this time, the refrigerant discharged from the compressor 220 sequentially passes through the second condenser 250, the second expansion valve 263, and the second evaporator 280, while reducing the relative amount of heat to the surrounding area due to primary condensation. The relative heat absorption amount of the second evaporator 280 is increased, and the cold air of about -30 degrees or less is transmitted to the food by driving the circulation fan 290, so that rapid freeze drying may be performed. Here, the rapid freeze drying temperature control may be performed through variable control of the pressure of the drying chamber 110 by driving the pressure control unit 300, control of a compressor drive rpm, and control of the opening degree of the second expansion valve 263.

Next, as shown in FIG. 8, when the low-temperature storage function of the dry matter is operated, the control unit (not shown) is the first branch pipe 230 in which the first condenser 240 is not installed among the plurality of first branch pipes 230. ) To open only the first valve body 231 of the plurality of second branch pipes 260, and open only the second valve body 261 of the second branch pipe 260 in which the first evaporator 270 is installed. Control the opening and closing. At this time, the refrigerant discharged from the compressor 220 sequentially passes through the second condenser 250, the first expansion valve 262, and the first evaporator 270, while reducing the relative amount of heat to the surrounding area due to primary condensation. The heat absorption of the first evaporator 270, which has a relatively small amount of heat absorption compared to the second evaporator 280, is achieved, and a low-temperature air of approximately 0°C to 20°C is transferred to the food by driving the circulation fan 290, so that low-temperature storage is possible. Can be done. Here, the low temperature storage temperature control may be performed through variable control of the pressure of the drying chamber 110 by driving the pressure control unit 300, control of a compressor drive rpm, and control of the opening degree of the first expansion valve 262.

Next, as shown in FIG. 9, when the residual moisture removal function in the drying chamber 110 is operated, the control unit (not shown) is a first branch pipe in which the first condenser 240 is installed among the plurality of first branch pipes 230. Only the first valve body 231 of 230 is opened, and only the second valve body 261 of the second branch pipe 260 in which the second evaporator 280 is installed among the plurality of second branch pipes 260 is opened. Valve opening and closing is controlled so that At this time, the refrigerant discharged from the compressor 220 sequentially passes through the first condenser 240, the second expansion valve 263, and the second evaporator 280, while increasing the relative amount of heat to the surrounding area due to the secondary condensation. Relative heat absorption of the second evaporator 280 is increased, and by driving the circulation fan 290, low-temperature air of approximately -5 degrees to 2 degrees is transmitted to the food to remove moisture still remaining on the food surface to completely dry the food. In addition to inducing, it is possible to remove residual moisture remaining in the drying room. Here, temperature control for removing residual moisture may be performed through variable control of the pressure of the drying chamber 110 by driving the pressure control unit 300, control of a compressor drive rpm, and control of the opening of the second expansion valve 263.

On the other hand, when the refrigerant flows only toward the second expansion valve 263 and the second evaporator 280 for rapid freeze drying of the dried product or for removing residual moisture in the drying chamber, the second evaporator is caused by the second evaporator with a relatively large amount of heat absorption. Cooled moisture adheres to the piping to form ice.

As shown in FIG. 5, the present invention further includes a defrosting part 400 for removing ice attached to the pipe of the second evaporator 280 as described above.

The defrost unit 400 is a defrost pipe 410 connecting between the second branch pipe 260 in which the second evaporator 280 is installed and the pipe connecting the compressor 220 and the first branch pipe 230, It includes an electronic automatic defrost valve 420 installed in the pipe 410, a manual defrost valve 430 on both sides of the electronic automatic defrost valve 420.

In the case of removing ice on the surface of the second evaporator 280 through such a pipe and valve structure, the control unit (not shown) controls the opening and closing of the plurality of valves so that the refrigerant is transferred to the compressor 220 and the defrost pipe 410 ), the flow path may be controlled to flow back into the compressor after passing through the second evaporator 280, and the defrosting operation of the second evaporator may be efficiently performed through the high-temperature, high-pressure refrigerant discharged from the compressor.

On the other hand, when such a defrost operation is performed, water falls below the second evaporator 280, and the defrost water collection plate 440 shares the lower region of the first evaporator 270 and the second evaporator 280 to collect such defrost water. ) Is further provided, and the defrost water collected on the defrost water collection plate 440 is discharged to the outside of the drying room through a separate pipe.

Although the present invention has been described with reference to the accompanying drawings and the above-described preferred embodiments, the present invention is not limited thereto, but is limited by the claims to be described later. Therefore, those of ordinary skill in the art can variously modify and modify the present invention within the scope of the technical spirit of the claims to be described later.

100: drying housing 120: main door
130: support frame part 131: support frame
132: vertical frame 133: frame open door
200: temperature control unit 210: duct
220: compressor 230: first branch pipe
231: first valve body 240: first condenser
250: second condenser 260: second branch pipe
261: second valve body 262: first expansion valve
263: second expansion valve 270: first evaporator
280: second evaporator 290: circulation fan
300: pressure control unit 400: defrost unit
440: defrost water collection plate

Claims (6)

Drying chamber 110 for drying the dry matter inside is formed and the drying housing 100 that can be sealed to the outside;
It is provided inside and outside the drying room 110, and inside the drying room to alternatively perform any one of a hot air drying function, a quick freeze drying function, a low temperature storage function, and a residual moisture removal function in the drying room. A temperature control unit 200 capable of providing a low or high temperature to the device; And
Including a pressure control unit 300 capable of adjusting the internal pressure of the drying housing 100,
The temperature control unit 200 connects a first condenser 240, a plurality of first branch pipes 230, and a pipe provided in any one of the compressor 220 and a plurality of first branch pipes 230 connected to the compressor. The second condenser 250 connected through the first evaporator 270 provided in any one of the plurality of second branch pipes 260 connected to the second condenser, and the second branch pipe connected to the second condenser 250. Complex food drying apparatus including a second evaporator 280 provided in the other. The method of claim 1,
The first condenser 240, the first evaporator 270, and the second evaporator 280 are disposed inside the drying housing 100, and the compressor 220 and the second condenser 250 are formed in the drying housing 100. ) Complex food drying device, characterized in that disposed outside. The method of claim 1,
The first evaporator (270) and the second evaporator (280) is a complex food drying apparatus, characterized in that the heat exchange area is formed in a structure different from each other. The method of claim 1,
A first valve body 231 for selectively opening a flow path is installed in the plurality of first branch pipes 230, and a second valve body 231 for selectively opening a flow path is installed in the plurality of second branch pipes 260. A complex food drying apparatus, characterized in that expansion valves are installed together with the valve body 261, respectively. The method of claim 4,
The second evaporator 280 has a structure having a relatively large heat exchange area compared to the first evaporator 270, and a plurality of expansion valves respectively installed in the plurality of second branch pipes 260 control the degree of expansion of the refrigerant. It consists of things that can be implemented differently from each other,
When the hot air drying function of the building is operated, only the first valve body of the first branch pipe in which a first condenser is installed among the plurality of first branch pipes is opened, and a second valve body in which a first evaporator is installed among the plurality of second branch pipes is opened. Only the second valve body of the branch pipe is opened,
When the quick freeze drying function of the dried product is operated, only the first valve body of the first branch pipe in which the first condenser is not installed among the plurality of first branch pipes is opened, and the second evaporator of the plurality of second branch pipes is opened. Only the second valve body of the installed second branch pipe is opened,
When the low-temperature storage function of the building is operated, only the first valve body of the first branch pipe in which the first condenser is not installed among the plurality of first branch pipes is opened, and the first evaporator is installed among the plurality of second branch pipes. Only the second valve body of the second branch pipe is opened,
When the residual moisture removal function in the drying room is operated, only the first valve body of the first branch pipe in which the first condenser is installed among the plurality of first branch pipes is opened, and the second evaporator is installed in the plurality of second branch pipes. Complex food drying apparatus, characterized in that only the second valve body of the two branch pipe is opened. The method of claim 1,
The first evaporator 270 and the second evaporator 280 are disposed adjacent to each other to form an evaporator group, and the temperature control unit 200 is between the first condenser 240 and the evaporator group disposed to face each other. Complex food drying apparatus, characterized in that it further comprises at least one circulation fan (290) arranged to be blown in a direction toward the evaporator group.

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