KR101409855B1 - Heat pump type hot-air drying machine - Google Patents

Abstract

Provided is a heat pump type dryer using hot air. The dryer using hot air comprises a refrigerant cycle device comprising a compressor; a condenser; an expansion valve; an evaporator; and a refrigerant circulation line. The dryer using hot air comprises an air circulation device comprising an air circulation line which passes the dried air of a drying room to the condenser and a circulation fan which is installed in the air circulation line and forcibly circulates the dried air. A heater is installed in the air circulation line. A controller selectively operates the refrigerant cycle device and the heater.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat pump type hot air dryer,

The present invention relates to a heat pump type hot air dryer for use in grain drying, pepper drying, mushroom drying, agricultural product drying, seafood drying, fiber drying, noodle drying, and industrial drying processes.

In the drying of agricultural and marine products, there are electric hot air drying, heat pump cold air drying and freeze vacuum drying. Depending on the type of laundry, the drying method is selected based on economics and experience.

Among them, the electric hot air drying method is the most popular. Electric hot air dryer has conventionally been composed of gas or oil type hot air dryer or gas type hot air dryer. However, electric hot air dryer is popular because of low price of electricity in rural areas. The hot pepper dryer, which is widely used in rural areas, uses an electric hot air dryer and is usually used at a drying temperature of 40 to 70 ° C.

In the case of a heat pump type air-cooled dryer, it is used in the categories of dehumidification of the evaporator and dehumidification of the condenser, and the price is slightly increased.

(Patent Document 1) Korean Patent Publication No. 2013-0097402

(Patent Document 2) U.S. Published Patent Application No. 2009-00711033

An object of the present invention is to provide a heat pump type hot air dryer in which a heat pump system and an auxiliary electric heater are employed in parallel to convert an operation mode according to an external air temperature condition.

An object of the present invention is to provide a heat pump type hot air dryer in which an evaporator is sent to the outside of a drying chamber so that the air in the drying chamber is purely used only for condenser heating to increase the drying coefficient.

An object of the present invention is to provide a heat pump type hot air dryer in which the evaporation temperature of an evaporator is operated at a predetermined temperature or higher.

An object of the present invention is to provide a heat pump type hot air dryer that can be utilized as a heat source for cooling outside air or water by using evaporation heat of an evaporator.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat pump type hot air dryer in which moisture in a dryer is naturally moistened and self-moistened.

According to an aspect of the present invention, there is provided a refrigerant compressor comprising: a compressor for compressing refrigerant at a high temperature and a high pressure; a condenser for condensing the refrigerant compressed in the compressor in a liquid phase; an expansion valve for expanding a refrigerant liquid condensed in a liquid state in the condenser; And a refrigerant circulation line connected between the compressor, the condenser, and the expansion valve and the evaporator to circulate the refrigerant; A drying chamber for containing the object to be dried; An air circulation line for circulating the dry air in the drying chamber while passing through the condenser, and a circulation fan installed on the air circulation line and forcibly circulating the dry air; A heater installed on the air circulation line; And a controller for controlling the refrigerant cycle device and the heater to be selectively driven according to the temperature of the outside air on the evaporator side.

The controller may further include a temperature controller for sensing an outside air temperature on the evaporator side, and the controller may selectively drive the refrigerant cycle apparatus and the heater based on the temperature set value sensed through the temperature controller.

And a refrigerant liquid pipe solenoid valve installed on the refrigerant circulation line connecting the condenser and the expansion valve to open and close the liquid refrigerant flow.

The apparatus may further include a moisturizing line for releasing moisture in the drying chamber.

A drying chamber temperature / humidity sensor for sensing a relative humidity of the drying chamber; And an automatic moisture regulator for automatically discharging the moisture in the drying chamber through the moisturizing line when the humidity sensed through the drying room temperature / humidity sensor is greater than the reference humidity.

And external air is supplied to the evaporator and heat-exchanged with cool air to be utilized as a cooling auxiliary heat source.

An outside air supply line for supplying the outside air to the evaporator side; A pre-filter installed on an upstream side of the evaporator along the external air supply line to filter foreign substances contained in the outside air; And an evaporator fan installed on the downstream side of the evaporator and forcedly blowing the outside air.

And a water circulation device for heat-exchanging water using the evaporation heat of the evaporator.

The water circulation device may include a water transfer pipe for passing the water so as to counterflow the refrigerant flow of the evaporator, and a pump for forcibly supplying water through the water transfer pipe.

The water circulation device further includes a water flow switch installed on the water transfer pipe. The controller controls the water circulation device so that the water pump is operated when the water circulation device operates, and after the water is supplied to the water transfer pipe, Control of the system.

And a refrigerant capacity control valve installed on the branch line branched from the front and rear ends of the compressor to regulate the refrigerant capacity.

According to another aspect of the present invention, there is provided a compressor for compressing a refrigerant at a high temperature and a high pressure, a condenser for condensing the refrigerant compressed in the compressor into a liquid phase, an expansion valve for expanding the refrigerant liquid condensed in the liquid phase in the condenser, Operating the refrigerant cycle apparatus including an evaporator for evaporating the refrigerant; Circulating air in the drying chamber while passing through the condenser to dry the drying object; Comparing and comparing the external temperature and the reference temperature; And a step of switching to a heater hot air drying operation mode when the external temperature is lower than the reference temperature to circulate air in the drying chamber through a heater to dry the drying subject, do.

The moisture evaporated from the drying object can be subjected to natural and forced drying.

The outside air is supplied to the evaporator side, and the outside air is heat-exchanged through the evaporator, and the generated cold air can be used as a cooling auxiliary heat source.

Water may be supplied to the evaporator side to heat-exchange the water with the evaporation heat to generate cold water.

So that the water is supplied to the evaporator and then the compressor is operated when the cold water is generated.

It is possible to adjust the initial suction pressure of the refrigerant to a predetermined pressure during the operation of the refrigerant cycle apparatus.

The heat pump type hot air dryer according to an embodiment of the present invention can achieve 1.4 kg / kWh or more, which is 2.0 times higher than the drying coefficient of the electric hot air dryer at a drying temperature of 40 to 70 ° C, The cost can be greatly reduced.

The heat pump type hot air dryer according to an embodiment of the present invention can be utilized as a subcooler using heat exchanged air through an evaporator, or can be utilized as a process heat source or a cold water heat source by supplying water to the evaporator side and utilizing heat exchange cold water.

The heat pump type hot air dryer according to an embodiment of the present invention can perform both natural and automatic moisturization in a drying chamber.

The heat pump type hot air dryer according to an embodiment of the present invention is capable of reducing the drying time or handling a large amount of drying capacity because the heat pump type hot air dryer has a higher capacity for condensing heat than the electric hot air dryer.

The heat pump type hot air dryer according to an embodiment of the present invention controls the temperature and the relative humidity of the drying room to easily control the final moisture content of the material to be dried according to the equilibrium moisture content of the material to improve the drying quality, .

The heat pump type hot air dryer according to an embodiment of the present invention uses 50% of the power compared to the electric hot air drying method between a drying temperature of 60 ° C and a drying temperature of 40 ° C .; a COP of 5.0 at a drying temperature of 40 ° C, a drying temperature of 60 And COP 3.2. As a result, the drying temperature is lowered and the heat pump COP is increased, so that the heating capacity is increased and the drying time is less changed.

The heat pump type hot air dryer according to one embodiment of the present invention produces twice the amount of the dry product based on the amount of electricity used, and when the drying temperature is 40 to 70 ° C, .

FIG. 1 is a view showing the construction of a heat pump type hot air dryer according to an embodiment of the present invention.
2 is a flowchart illustrating a hot air drying operation through a refrigerant cycle apparatus of a heat pump type hot air dryer according to an embodiment of the present invention.
3 is a flowchart illustrating a hot air drying operation through a heater of a heat pump type hot air dryer according to an embodiment of the present invention.
4 is a flowchart illustrating an operation process of a heat pump type hot air dryer according to an embodiment of the present invention.
FIG. 5 is a view showing the construction of a heat pump type hot air dryer according to another embodiment of the present invention.
6 is a view showing a configuration of a heat pump type hot air dryer according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Each embodiment describes various aspects of the invention. For example, the features described with respect to one embodiment may be used as another alternative to be replaced with another embodiment.

A typical heat pump type hot air dryer according to an embodiment of the present invention is basically configured to perform a drying operation by selectively using a condenser and an electrically operated heater row of a refrigerant cycle apparatus. The heat pump type hot air dryer according to one embodiment of the present invention is adapted to operate in a drying temperature range of 40 to 100 ° C, and is applied to grain, pepper, mushroom, agricultural products, aquatic products, fiber, .

1 is a view showing a basic configuration of a heat pump type hot air dryer according to an embodiment of the present invention.

1, a heat pump type hot air dryer 1 according to an embodiment of the present invention includes a drying chamber 3, a refrigerant cycle device 100, an air circulation device 130, and a heater 122 .

The refrigerant cycle apparatus 100 includes a compressor 101 for compressing refrigerant to a high temperature and a high pressure, a condenser 102 for condensing the refrigerant compressed in the compressor 101 into a liquid phase, a condenser 102 for expanding the refrigerant condensed in the liquid phase in the condenser 102 And an evaporator 108 for evaporating the refrigerant expanded in the expansion valve 105. [ A refrigerant circulation line for circulating the refrigerant is disposed between the compressor 101, the condenser 102, the expansion valve 105, and the evaporator 108.

A receiver (103) is disposed in the refrigerant circulation line between the condenser (102) and the expansion valve (105). The receiver (103) temporarily stores the liquid refrigerant condensed by the condenser (102).

A refrigerant liquid tube valve 104 is disposed on the refrigerant circulation line between the condenser 102 and the expansion valve 105. The refrigerant liquid tube valve 104 is disposed on the downstream side of the receiver 103.

A refrigerant liquid separator 109 is disposed in the refrigerant circulation line between the compressor 101 and the evaporator 108. When the refrigerant liquid separator 109 fails to evaporate a large amount of liquid refrigerant in the evaporator 108, the compressor 101 causes liquid compression. In order to prevent this, the refrigerant liquid separator 109 separates the refrigerant liquid so that only the refrigerant vapor is sent to the compressor 101, and the separated liquid refrigerant is evaporated by the external air temperature and sent to the compressor 101.

A refrigerant capacity control valve 107 is provided in the refrigerant circulation lines on the front and rear ends of the compressor 101 so that branch lines are connected and the appropriate refrigerant suction pressure is maintained on the branch lines. The refrigerant capacity control valve 107 operates when the refrigerant suction pressure is lowered due to the lowering of the external temperature so as to maintain the set suction pressure. On the upstream side of the refrigerant capacity control valve 107, an electromagnetic valve 106 is provided to open and close the branch line. The refrigerant whose set suction pressure is adjusted through the refrigerant capacity control valve 107 flows toward the upstream side of the evaporator 108. [

And an evaporator fan 123 for supplying external air to the evaporator 108 side is provided on the evaporator 108 side.

Since the evaporator 108 is disposed outside the drying chamber 3 and is heated using only the condenser 102 in the drying chamber 3, the heat pump dry COP is 3.0 to 5.0 depending on the drying temperature, The coefficient is two times or more.

The air circulating apparatus 130 includes air circulation lines 131 and 132 for circulating the air in the drying chamber 3 while passing through the condenser 102 and circulation fans 131 and 132 installed on the air circulation line for forcibly circulating the air in the drying chamber 3 121).

The air circulation line includes an air recovery line 131 for recovering air from the drying chamber 3 and an air supply line 132 for supplying the heat exchanged air to the drying chamber 3.

The air supply line 132 is arranged to pass through the condenser 102 and the circulation fan 121 is disposed on the air supply line 132 adjacent to the condenser 102. A heater 122 is disposed between the circulating fan 121 and the condenser 102 to generate electricity. That is, the condenser 102, the heater 122, and the circulating fan 121 are disposed in order on the air supply line 132 along the air flow direction.

When the outside temperature is a predetermined temperature, for example, 7 DEG C or less, the refrigerant cycle apparatus 100 is stopped and the heater 122 is operated. If the external temperature is 7 ° C or less, the COP of the refrigerant cycle apparatus 100 drops sharply and a complicated defrost apparatus should be provided. The heater 122 eliminates the complicated defrosting device and performs hot air drying in place of the condenser 102 of the refrigerant cycle device 100.

The dryer 1 according to an embodiment of the present invention may further include a temperature controller 141 for detecting an external temperature of the evaporator 108 side.

The drying chamber (3) is provided with a moisturizing line (133) for discharging the moisture evaporated from the object to be dried (5) to the outside of the drying chamber (3). When the temperature and humidity of the drying room are lower than that of the outside, natural moisturization is performed. When the temperature and humidity of the drying room are higher than the outside temperature, the humidity control line 135 is operated And is configured to be forcedly regulated.

The dryer (1) includes a controller (500) for controlling the overall operation of the dryer.

The controller 500 is connected to the compressor 101 of the refrigerant cycle apparatus 100, the heater 122, the circulating fan 121, the temperature regulator 141 and the drying room temperature / humidity sensor 143, the refrigerant liquid tube valve 104, And controls the overall operation of the dryer 1 in cooperation with the electromagnetic valve 106 and the like.

The controller 500 instructs the refrigerant cycle apparatus 100 and the heater 122 to selectively operate based on the temperature set value received through the temperature controller 141. [

The controller 500 controls the forced humidity regulator 135 to forcibly regulate the moisture in the drying chamber 3 based on the temperature and humidity values received from the drying room temperature and humidity sensor 143. The controller 500 stops the refrigerant cycle apparatus 100 or the heater 122 to complete the drying operation when the humidity in the drying chamber 3 reaches the set humidity corresponding to the drying condition of the laundry 5. The controller (500) controls the compressor (101) and the heater (122) based on the set temperature of the dryer (1).

Next, the operation of the heat pump type hot air dryer constructed as described above will be described.

FIG. 2 is a flowchart illustrating a drying operation of the refrigerant cycle apparatus of the heat pump type hot air dryer according to the embodiment of the present invention. FIG. 3 is a flowchart of a drying operation of the heat pump type hot air dryer, to be. 4 is a flowchart showing an operation state of a heat pump type hot air dryer according to an embodiment of the present invention.

Referring to FIGS. 2 and 4, when the hot air drying operation is started, the refrigerant liquid pipe solenoid valve 104 is opened and the refrigerant cycle apparatus 100 is operated (S10). More specifically, the compressor 101 is operated to compress the refrigerant to a high temperature and a high pressure, and the refrigerant compressed by the compressor 101 is condensed into a liquid state through the condenser 102. The liquid refrigerant condensed in the condenser 102 is temporarily stored in the receiver 103 and then supplied to the expansion valve 105. The liquid refrigerant expands through the expansion valve 105, and the refrigerant expanded in the expansion valve 105 evaporates through the evaporator 108. The compressor 101 is controlled by the dryer set temperature. Here, the evaporator fan 123 disposed on the side of the evaporator 108 adjacent to the expansion valve 105 operates to allow the outside air around the evaporator 108 to flow toward the evaporator 108 side. The outside air is heat-exchanged with the evaporator 108 to be deprived of heat and discharged as low air. At this time, the proper refrigerant suction pressure must be maintained to improve the performance of the condenser 102. Accordingly, when the refrigerant suction pressure is lowered due to the lowering of the external temperature, the refrigerant capacity control valve 107 operates to maintain the refrigerant suction pressure at the set suction pressure.

During the operation of the refrigerant cycle apparatus 100, the air in the drying chamber 3 is recovered through the air recovery line 131 by the forced circulation operation of the circulation fan 121, 3). At this time, the air is heated by the condenser 102 disposed on the air supply line 132 in accordance with the set temperature of the drying room and supplied into the drying chamber 3 to dry the laundry 5 (S30).

Since the air in the drying chamber 3 is purely heated using only the heat of the condenser 102, the COP (coefficient of performance) of the heat pump is 3.0 to 5.0 according to the drying temperature, Is more than double.

During the drying operation, the temperature controller 141 senses the outside temperature of the evaporator 108, and the controller 500 determines whether the set temperature received through the temperature controller 141 is equal to or higher than the reference temperature, (S50). If the external temperature is equal to or higher than the reference temperature, the process returns to step S30 to continue the drying operation of the object 5 using the heat of the condenser 103 of the refrigerant cycle apparatus 100. [

Meanwhile, the drying room temperature / humidity sensor 143 senses the humidity in the drying room 3, and the controller 500 determines whether the humidity received through the drying room temperature / humidity sensor 143 reaches the set humidity (S70). If the result of the determination step S70 is NO, the process returns to step S30 to continue the drying operation of the object 5 using the condenser 102 of the refrigerant cycle apparatus 100. [ The moisture evaporated from the drying object 5 during the drying of the laundry 5 is naturally discharged when the temperature and humidity inside the drying chamber 3 are lower than the outside temperature. When the temperature and humidity of the drying room are higher than the outside temperature, And is forcibly discharged through the regulator 135.

On the other hand, if the result of the determination step S70 is YES, that is, if the humidity in the drying chamber 3 reaches the set humidity, the refrigerant cycle apparatus 100 is stopped to complete the drying operation (S90). As described above, the dryer 1 according to an embodiment of the present invention controls the relative humidity in the drying chamber 3 to easily control the final moisture content of the laundry 5 based on the equilibrium moisture content of the material, To contribute to the high added value of.

3 and 4, when the result of the determining step S50 is NO, that is, when the external temperature is lower than the reference temperature, for example, 7 DEG C, the refrigerant cycle apparatus 100 is stopped and the heater 300 (S110).

The heater 122 is disposed on the air supply line 132 to heat the air supplied into the drying chamber 3. The object 5 in the drying chamber 3 is hot-air dried by the air heated by the heater 300 (S130). If the outside air temperature is lower than 7 ° C, the heat pump refrigerator COP must drop sharply and a complex defrosting device must be provided. The heater 122 is configured to stop the refrigerant cycle apparatus 100 to perform the auxiliary hot air drying function to exclude the defrosting apparatus.

The moisture evaporated from the laundry 5 while the laundry 5 is dried by the heater 122 is naturally discharged when the temperature and humidity in the drying chamber 3 are lower than the outside, And is forcibly discharged through the automatic air conditioning regulator 135 when it is higher than the outside.

The drying room temperature and humidity sensor 143 senses the humidity in the drying room 3 while the drying object 5 is dried using the heat of the heater 122 and the controller 500 senses the humidity received through the drying room temperature and humidity sensor 143 It is determined whether the humidity has reached the set humidity (S150).

If the result of the determination step S70 is YES, that is, if the humidity in the drying chamber 3 reaches the set humidity, the refrigerant cycle apparatus 100 is stopped to complete the drying operation (S90). If the result of the determination step S70 is NO, the process returns to step S30 to continue the drying operation of the object 5 using the condenser 103 of the refrigerant cycle apparatus 100. [

The operation of the heat pump type hot air dryer according to an embodiment of the present invention is characterized in that the evaporation temperature is the highest at 20 DEG C and the performance is lowered as the evaporation temperature is lowered. COP is 3 or more (see Table 1).

(Table 1) Refrigerant 134a Heat pump dry COP change according to evaporation temperature of reciprocating compressor

Compressor selection Refrigerant 134a MTZ 018-1 Remarks Condensing temperature (℃) 65 Evaporation temperature (℃) 20 15 10 5 Cooling heat (W) 5,077 3,953 3,013 2,240 Compressor power required (W) 1,709 1,554 1,388 1,215 Condenser heating calorie (W) 6,786 5,507 4,401 3,455 Heat pump dry COP 3.97 3.54 3.17 2.84 Condenser heating calorie / compressor power Average driving in summer ◎ Indoor average driving ◎

FIG. 5 is a view showing the construction of a heat pump type hot air dryer according to another embodiment of the present invention.

The same reference numerals are assigned to the same components as those shown in Figs. 1 to 4 and overlapping descriptions are omitted.

Referring to FIG. 5, the heat pump type hot air dryer 1 according to another embodiment of the present invention is configured such that the outside air is supplied to the evaporator 108 and the heat exchanged cool air is used as a cooling auxiliary heat source.

An external air supply line 133 for supplying external air to the evaporator 108 and an external air supply line 133 on the upstream side of the evaporator 108 along the external air supply direction are provided with a pre- ) Is further disposed. The pre-filter 110 filters foreign matter contained in the outside air. On the downstream side of the evaporator 108, an evaporator fan 123a is provided to force the outside air to the evaporator 108 side.

When the evaporator fan 123a provided at one side of the evaporator 108 is driven and rotated through the above construction, the outside air is supplied along the outside air supply line 133 by the suction force of the evaporator fan 123a. The supplied external air passes through the pre-filter (110). At this time, foreign matter contained in the pre-filter 110 is filtered. The air filtered through the pre-filter 110 is converted into a cool air by the heat of evaporation of the evaporator 108. The generated cold air can be utilized as a cooling auxiliary heat source, for example.

6 is a view showing a configuration of a heat pump type hot air dryer according to another embodiment of the present invention.

The same reference numerals are assigned to the same components as those shown in Figs. 1 to 4 and overlapping descriptions are omitted.

Referring to FIG. 6, the heat pump type hot air dryer 1 according to another embodiment of the present invention includes a water circulation device 180 to supply water to the evaporator 108a and heat-exchange the evaporator 108a by the evaporator 108a.

The water circulation device 180 includes a water conveyance pipe 181 through which the water flows countercurrently with the refrigerant flow of the evaporator 108a and a pump 183 for forcibly supplying water through the water conveyance pipe 181 .

A water flow switch (not shown) may be further provided on the water conveyance pipe 181.

The controller 500 performs the interlock control so that the pump 183 is operated and the water is supplied to the water conveyance pipe 181 and the compressor 101 is operated when the water circulation device 180 is operated.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

1: heat pump type hot air dryer 100: refrigerant cycle device
101: compressor 102: condenser
105: expansion valve 108: evaporator
110: prefilter 122: heater
130: air circulation device 141: thermostat
143: Dry room temperature and humidity sensor 180: Water supply device

Claims (17)

delete delete A condenser for condensing the refrigerant compressed in the compressor to a liquid phase, an expansion valve for expanding the refrigerant liquid condensed in the liquid phase in the condenser, an evaporator for evaporating the refrigerant expanded in the expansion valve, And a refrigerant circulation line connecting the compressor, the condenser, and the expansion valve and the evaporator to circulate the refrigerant;
A drying chamber for containing the object to be dried;
An air circulation line for circulating the dry air in the drying chamber while passing through the condenser, and a circulation fan installed on the air circulation line and forcibly circulating the dry air;
A heater installed on the air circulation line;
A controller for controlling the refrigerant cycle device and the heater to be selectively driven according to an external air temperature on the evaporator side; And
And a temperature controller for sensing an outside air temperature on the evaporator side.
Wherein the controller selectively drives the refrigerant cycle device and the heater based on a temperature set value sensed by the temperature regulator, the heat pump type hot air dryer comprising:
Further comprising a refrigerant liquid tank valve installed on a refrigerant circulation line connecting between the condenser and the expansion valve to open and close the liquid refrigerant flow. 4. The heat pump type hot air dryer as claimed in claim 3, further comprising a moisture distribution line for discharging moisture in the drying chamber. [5] The apparatus of claim 4, further comprising: a drying chamber temperature / humidity sensor for sensing the temperature and humidity of the drying chamber; And
Further comprising an automatic dehumidifying regulator for automatically discharging moisture in the drying chamber through the dehumidifying line when a humidity value detected through the drying room temperature / humidity sensor is greater than a reference value. The heat-pump-type hot air dryer as set forth in claim 3, wherein external air is supplied to the evaporator and heat-exchanged with cool air to be utilized as a cooling auxiliary heat source. The air conditioner according to claim 6, further comprising: an outside air supply line for supplying the outside air to the evaporator;
A pre-filter installed on an upstream side of the evaporator along the external air supply line to filter foreign substances contained in the outside air; And
And an evaporator fan installed on a downstream side of the evaporator and forcedly blowing the outside air. 4. The heat pump type hot air dryer as claimed in claim 3, further comprising a water circulation device for heat-exchanging water by using the evaporation heat of the evaporator. The heat pump type hot air dryer as set forth in claim 8, wherein the water circulation device comprises: a heat pump type hot air dryer including a water conveyance pipe for passing the water counterflowed with the refrigerant flow of the evaporator; and a pump for forcibly supplying water through the water conveyance pipe . 10. The water treatment system according to claim 9, wherein the water circulation device further comprises a water flow switch installed on the water transfer pipe,
Wherein the controller is configured to perform interlock control such that the pump operates and the compressor operates after the water is supplied to the water conveying pipe when the water circulating device operates. A condenser for condensing the refrigerant compressed in the compressor to a liquid phase, an expansion valve for expanding the refrigerant liquid condensed in the liquid phase in the condenser, an evaporator for evaporating the refrigerant expanded in the expansion valve, And a refrigerant circulation line connecting the compressor, the condenser, and the expansion valve and the evaporator to circulate the refrigerant;
A drying chamber for containing the object to be dried;
An air circulation line for circulating the dry air in the drying chamber while passing through the condenser, and a circulation fan installed on the air circulation line and forcibly circulating the dry air;
A heater installed on the air circulation line; And
And a controller for selectively controlling the refrigerant cycle device and the heater to be driven according to an external air temperature on the evaporator side,
Further comprising a refrigerant capacity control valve installed on a branch line branched from the front and rear ends of the compressor to adjust a refrigerant capacity. delete A condenser for condensing the refrigerant compressed in the compressor into a liquid phase, an expansion valve for expanding the refrigerant liquid condensed in the liquid phase in the condenser, and an evaporator for evaporating the refrigerant expanded in the expansion valve Operating the refrigerant cycle apparatus;
Circulating air in the drying chamber while passing through the condenser to dry the drying object;
Comparing the outside temperature of the evaporator with a reference temperature; And
And when the external temperature is lower than the reference temperature, switching to a heater hot air drying operation mode to circulate the air in the drying chamber through a heater to dry the laundry,
Wherein the moisture evaporated from the drying object is subjected to natural moisturization and forced moisturization. 14. The control method of a heat pump type hot air dryer according to claim 13, wherein outside air is supplied to the evaporator side, and the outside air is heat-exchanged through the evaporator, and the generated cold air is used as a cooling auxiliary heat source.  14. The control method of a heat pump type hot air dryer as claimed in claim 13, wherein water is supplied to the evaporator side to heat-exchange the water with the evaporation heat to generate cold water. 16. The control method of a heat pump type hot air dryer as set forth in claim 15, wherein when the cold water is generated, the water is supplied to the evaporator and then the compressor is operated. 15. The control method of a heat pump type hot air dryer as set forth in claim 14, comprising adjusting the initial suction pressure of the refrigerant to a constant pressure during operation of the refrigerant cycle apparatus.

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