Refrigeration / heating heat pump system provided with dehumidification unit in indoor unit, and control method

Abstract

The present invention relates to a cooling / heating heat pump system equipped with a dehumidification unit in an indoor unit, and a control method, the heat pump system comprising: a cooling duct for converting a high-temperature and high-pressure refrigerant discharged from the discharge side of a compressor into a low-temperature and low-pressure refrigerant through a four-way valve, an outdoor unit and a first expansion valve; the low-temperature and low-pressure refrigerant passes through an indoor heat exchanger placed in the indoor unit, flows into the four-way valve and is circulated to the suction side of the compressor again; and a dehumidification duct through which the high-temperature and high-pressure refrigerant discharged to the discharge side of the compressor is discharged to the dehumidification duct formed between the discharge side and the four-way valve. A high-temperature and high-pressure refrigerant discharged through an upper-end refrigerant pipeline of a dehumidification heat exchanger which is separated from the lower end of an indoor heat exchanger of an indoor unit and placed in parallel is converted into a low-temperature and low-pressure refrigerant through a second expansion valve, and flows into the lower-end refrigerant pipeline of the dehumidification heat exchanger again. The passed refrigerant will circulate to the compressor through the suction side of the compressor.

Description

Technical Field

[0001] The present invention relates to a cooling and heating heat pump system and a control method having a dehumidification unit in an indoor unit, and relates to the following cooling and heating heat pump system and control method, which has a system that can perform dehumidification separately or simultaneously during cooling and heating operations, can realize normal refrigerant circulation operation, and has a dehumidification heat exchanger separately provided in the indoor unit. Background Art

[0002] Generally, a heat pump is a low-temperature cooling and heating device that uses the heat generated by the refrigerant or the heat of condensation to transfer a low-temperature heat source to a high-temperature one, or vice versa. Based on the driving method, it is divided into electric and engine types. Currently, most structures are used for both cooling and heating.

[0003] This heat pump cooling and heating device forms a refrigeration cycle including a compressor, a condenser and an evaporator, and uses a four-way valve or a solenoid valve to interact with each other to implement cooling and heating.

[0004] Cooling and heating devices using such heat pumps are used for cooling and heating in a variety of facilities and are also suitable for agricultural crop cultivation facilities such as fruits, vegetables, and special crops, where they optimize cultivation conditions by appropriately controlling the cultivation temperature.

[0005] However, conventional cooling and heating devices using heat pumps are weak in humidity control functions. Therefore, when used in crop cultivation facilities that are sensitive to temperature and humidity control, there is a problem in that a separate dehumidifier needs to be additionally installed.

[0006] Furthermore, this conventional dehumidifying and heating device experiences a refrigerant shortage due to refrigerant condensation in cold winter and a refrigerant saturation in hot summer, thereby reducing the effectiveness of the cooling, heating, and dehumidifying functions. Consequently, an air conditioner needs to be used in addition in summer, and an electric heater and electric fan need to be used separately in winter, which is troublesome and consumes a lot of equipment installation costs.

[0007] Furthermore, in the summer, chilled water supplied by the cooling and heating load pump cools and dehumidifies the air ventilated indoors by the chilled and hot water heat exchangers. However, when dehumidification is high, the humidity and temperature are reduced simultaneously in the chilled and hot water heat exchangers, causing the temperature of the air supplied to the greenhouse to drop excessively.

[0008] As described above, if air with a temperature too low compared to the average temperature inside the greenhouse is supplied to the greenhouse, it will cause adverse consequences such as poor crop growth and poor fire ignition.

[0009] However, reducing the temperature difference between ventilation and supply air to prevent these growth and ignition problems requires circulating a large amount of air to meet the greenhouse's cooling load. This increases the size of the air conditioning fan and the fan power. Furthermore, excessively high air speeds increase the amount of air bypassing the cold and hot water heat exchangers, shortening the time it takes for condensation to form on the coils, thus preventing proper dehumidification.

[0010] Prior art literature

[0011] Patent Literature

[0012] Patent Document 1: Korean Patent Gazette No. 10-133646

[0013] Patent Document 2: Korean Patent Gazette No. 10-2021525

[0014] Patent Document 3: Korean Patent Gazette No. 10-2050694 Summary of the Invention

[0015] The present invention is proposed to solve the problems mentioned above. The purpose of the present invention is to provide a system that can realize cooling and heating operations and dehumidification operations separately or simultaneously to increase the dehumidification operation efficiency and improve the dehumidification amount. The present invention also provides a cooling and heating system and a control method that do not require a separate dehumidifier.

[0016] The present invention is a technical solution for solving the above-mentioned problems. The present invention relates to a cooling and heating heat pump system and a control method equipped with a dehumidification unit in an indoor unit. The heat pump system includes: a cooling pipe, which allows the high-temperature and high-pressure refrigerant discharged from the discharge side of the compressor to pass through a four-way valve, pass through the outdoor unit and be converted into a low-temperature and low-pressure refrigerant through a first expansion valve. The low-temperature and low-pressure refrigerant passes through an indoor heat exchanger placed in the indoor unit and flows into the four-way valve and circulates to the suction side of the compressor again; a dehumidification pipe, which allows the high-temperature and high-pressure refrigerant discharged to the discharge side of the compressor to be discharged to a dehumidification pipe formed between the discharge side and the four-way valve, and the high-temperature and high-pressure refrigerant discharged through the upper end refrigerant pipe of the dehumidification heat exchanger separated from and placed in parallel with the lower end of the indoor heat exchanger of the indoor unit will pass through the second expansion valve and be converted Low-temperature and low-pressure refrigerant flows back into the refrigerant pipe at the lower end of the dehumidification heat exchanger. The refrigerant passed through will circulate to the compressor through the suction side of the compressor. When the control unit switches to cooling mode, the dehumidification valve formed by the dehumidification pipe on the discharge side of the compressor will be closed, and the cooling and heating valve will be opened. When the control unit switches to dehumidification mode, the dehumidification valve formed by the dehumidification pipe on the discharge side of the compressor will be opened, and the cooling and heating valve will be closed. When the control unit switches to cooling and dehumidification mode, the dehumidification valve formed by the dehumidification pipe on the discharge side of the compressor will be opened, and the cooling and heating valve will be opened together. The refrigerant discharged from the compressor is distributed and supplied to the cooling pipe and dehumidification pipe according to a preset ratio, and flows into each other in the liquid separator installed at the front end of the compressor and circulates to the compressor.

[0017] As described above, the present invention has the following effects: cooling and heating operation and dehumidification operation can be realized separately or simultaneously, thereby simplifying the control of cooling and heating and dehumidification operation and increasing the efficiency of dehumidification operation.

[0018] Furthermore, the present invention has the effect of providing a system that improves dehumidification capacity without requiring a separate dehumidifier.

[0019] Furthermore, the present invention has the following effects: in winter, due to the defrosting of the evaporator of the outdoor heat exchanger, the efficiency and heat will be reduced. In order to prevent a sharp decrease in heating efficiency, heat is supplied to the reheat pipe in stages according to the degree of defrosting of the reheat pipe and the degree of reduction in heating operation efficiency, thereby achieving normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram showing a cooling heat pump system according to the present invention in which a dehumidification unit is provided in an indoor unit.

[0021] Figure 2 This is a schematic diagram showing a heating heat pump system according to the present invention in which a dehumidification unit is provided in an indoor unit.

[0022] Figure 3 This is a schematic diagram showing a reheat pipe of a cooling and heating heat pump system including a dehumidification unit in an indoor unit according to the present invention.

[0023] Figure 4 This is a schematic diagram showing a refrigerant path in an outdoor heat exchanger of a cooling and heating heat pump system including a dehumidifying unit in an indoor unit according to the present invention.

[0024] Figure 5 This is a flowchart showing cooling, heating, dehumidification, and defrosting control by the control method of a heat pump equipped with a dehumidifying unit in an indoor unit according to the present invention.

[0025] Figure 6 This is a schematic diagram illustrating a control method of a heat pump including a dehumidifying unit in an indoor unit according to the present invention. DETAILED DESCRIPTION

[0026] Before describing in detail a plurality of embodiments of the present invention, it should be understood that the present invention is not limited to the composition and arrangement details of the structural elements described in the following detailed description or shown in the figures. The present invention can be realized and implemented into other embodiments and can be performed by a variety of methods. In addition, the expressions and terms such as the direction of the relevant device or element (for example, "front", "back", "up", "down", "top", "bottom", "left", "right", "lateral") used in this application are only used to simplify the description of the present invention, and the relevant device or element may also only represent a specific direction or may also have other meanings. In addition, the terms such as "first", "second", etc. are used in the scope of protection of this application and the additional invention for the purpose of explanation, and are not meant to indicate the meaning of relative importance or subject matter.

[0027] In order to achieve the above-mentioned object, the present invention has the following features.

[0028] The following describes in detail preferred embodiments of the present invention with reference to the accompanying drawings. Prior to this, terms and words used in this specification and the scope of the claims should not be interpreted as having general or dictionary definitions. Instead, they should be interpreted as meanings and concepts consistent with the technical concepts of the present invention, based on the principle that inventors can appropriately define terms and concepts to best explain their inventions.

[0029] Therefore, the embodiments described in this specification and the structures shown in the accompanying drawings are only the most preferred embodiments of the present invention, and do not replace all the technical ideas of the present invention. Therefore, it should be understood that there may be multiple equivalent technical solutions and variations to replace these at the time of this application.

[0030] According to an embodiment of the present invention, the present invention relates to a cooling and heating heat pump system with a dehumidification unit in an indoor unit, the heat pump system comprising: a refrigeration pipe 100, which allows the high-temperature and high-pressure refrigerant discharged from the discharge side 11 of the compressor 10 to pass through a four-way valve 20, pass through an outdoor unit 30 and be converted into a low-temperature and low-pressure refrigerant through a first expansion valve 40, the low-temperature and low-pressure refrigerant passes through an indoor heat exchanger 51 placed in an indoor unit 50 and flows into the four-way valve 20, and circulates again to the suction side 12 of the compressor 10; and a dehumidification pipe 200, which allows the high-temperature and high-pressure refrigerant discharged from the discharge side 11 of the compressor 10 to pass through a four-way valve 20, pass through an outdoor unit 30 and be converted into a low-temperature and low-pressure refrigerant through a first expansion valve 40, the low-temperature and low-pressure refrigerant passes through an indoor heat exchanger 51 placed in an indoor unit 50 and flows into the four-way valve 20, and circulates again to the suction side 12 of the compressor 10; The high-temperature and high-pressure refrigerant discharged from the dehumidification pipe 200 formed between the discharge side 11 and the four-way valve 20 is discharged. The high-temperature and high-pressure refrigerant discharged from the dehumidification heat exchanger 210 through the upper end refrigerant pipe 210a of the dehumidification heat exchanger 210 separated and placed in parallel at the lower end of the indoor heat exchanger 51 of the indoor unit 50 will pass through the second expansion valve 220 and be converted into a low-temperature and low-pressure refrigerant, and will flow back into the lower end refrigerant pipe 210b of the dehumidification heat exchanger 210. The refrigerant passed through will pass through the suction side 12 of the compressor 10 to circulate to the compressor 10 and to the indoor unit 50. The indoor air flowing into the front surface of the element 50 passes through the heat exchanger of the lower end refrigerant pipe 210b of the above-mentioned dehumidification heat exchanger 210 and is cooled and dehumidified. The cooled and dehumidified air passes through the heat exchanger of the upper end refrigerant pipe 210a and the air temperature is increased. Then, it passes through the above-mentioned indoor heat exchanger 51 and is cooled and dehumidified and supplied to the room. When the control unit 400 switches to the cooling mode, the dehumidification valve 230 formed by the dehumidification pipe 200 on the discharge side 11 of the above-mentioned compressor 10 will be closed. At the same time, the cooling and heating valve 60 will be opened. When the dehumidification mode is switched, , the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the above-mentioned compressor 10 will be opened, and at the same time, the cooling and heating valve 60 will be closed. When it is switched to the cooling and dehumidification mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the above-mentioned compressor 10 will be opened, and at the same time, the cooling and heating valve 60 will also be opened together. The refrigerant discharged from the above-mentioned compressor 10 is distributed and supplied to the above-mentioned cooling pipe 100 and dehumidification pipe 200 according to a preset ratio, and flows into each other in the liquid separator 80 installed at the front end of the compressor 10 and circulates to the compressor 10.

[0031] Furthermore, as another embodiment of the present invention, the heat pump system further includes a heating pipe 300, which allows the high-temperature and high-pressure refrigerant discharged from the discharge side 11 of the compressor 10 to pass through the four-way valve 20, pass through the indoor heat exchanger 51 placed in the indoor unit 50 and be converted into a low-temperature and low-pressure refrigerant through the first expansion valve 40, pass through the outdoor unit 30 and pass through the four-way valve 20 to re-circulate to the suction side 12 of the compressor 10, and a plurality of reheat pipes 70 with electric heating rods 71 are formed on the inlet side of the outdoor unit 30 of the heating pipe 300, and the surface temperature of the outdoor heat exchanger 31 of the outdoor unit 30 and the humidity temperature of the inflowing air into the outdoor unit 30 are measured. The control unit 400 determines whether to perform defrosting. When the defrosting conditions are met, the electric heating rod 71 will work, and the plurality of electric heating rods 71 will be selectively and simultaneously operated. When the control unit 400 switches to heating mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the compressor 10 will be closed, and the cooling and heating valve 60 will be opened. When the control unit 400 switches to dehumidification mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the compressor 10 will be opened, and the cooling and heating valve 60 will be closed. When the control unit 400 switches to heating mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the compressor 10 will be opened, and the cooling and heating valve 60 will be opened together. The refrigerant discharged from the compressor 10 is distributed and supplied to the heating pipe 300 and the dehumidification pipe 200 according to a preset ratio, and flows into each other in the liquid separator 80 installed at the front end of the compressor 10 and circulates to the compressor 10.

[0032] Furthermore, as another embodiment of the present invention, the capacity of the dehumidification heat exchanger 210 is smaller than the heat capacity of the indoor heat exchanger 51 .

[0033] Furthermore, as another embodiment of the present invention, the number of refrigerant tubes forming the upper refrigerant pipe 210a functioning as a condenser of the dehumidification heat exchanger 210 is greater than the number of refrigerant tubes forming the lower refrigerant pipe 210b functioning as an evaporator.

[0034] Furthermore, as another embodiment of the present invention, the multiple refrigerant branch passages of the outdoor heat exchanger 35 of the outdoor unit 30 are formed by an upper passage portion 35a, a middle passage portion 35b, and a lower passage portion 35c. The upper passage portion 35a allows the refrigerant to flow into the upper end portion to form a preset refrigerant passage flow path, so that the refrigerant flows out from the upper end portion and flows into the outdoor refrigerant liquid collecting portion 38 located at the lower end of the outer side of the outdoor heat exchanger 35. The middle passage portion 35b allows the refrigerant to flow into the middle end portion to form a preset refrigerant passage flow path, so that the refrigerant flows out from the middle end portion and flows into the outdoor refrigerant liquid collecting portion 38. The lower passage portion 35c allows the refrigerant to flow into the lower end portion to form a preset refrigerant passage flow path, so that the refrigerant flows out from the lower end portion and flows into the outdoor refrigerant liquid collecting portion 38. The refrigerant mixed in the outdoor refrigerant liquid collecting portion 38 flows back into the outdoor heat exchanger 35 to realize heat exchange, and flows out from the outdoor heat exchanger 35 again.

[0035] Furthermore, as another embodiment of the present invention, the present invention relates to a control method for a cooling and heating heat pump having a dehumidification unit in an indoor unit, wherein an indoor heat exchanger 51 is separately installed in the indoor unit 50 and a dehumidification heat exchanger 210 is installed at its lower end in a manner separated therefrom, the cooling and heating heat pump includes a control unit 400, the control unit 400 including: a cooling pipe 100 and a heating pipe 300, an outdoor heat exchanger 31 connected to the outdoor unit 30, the indoor heat exchanger 51 and the outdoor heat exchanger 31 being connected to each other; and a dehumidification pipe 200, which is separately formed from the cooling pipe 100 and the heating pipe 300 and includes an upper control unit 400. The refrigerant pipe 210a and the lower refrigerant pipe 210b, the upper refrigerant pipe 210a acts as a condenser in the dehumidification heat exchanger 210, and the lower refrigerant pipe 210b acts as an evaporator. The high-temperature and high-pressure refrigerant discharged to the discharge side 11 of the compressor 10 is discharged to the dehumidification pipe 200 formed between the discharge side 11 and the four-way valve 20. The high-temperature and high-pressure refrigerant passing through the upper refrigerant pipe 210a of the dehumidification heat exchanger 210 separated and placed in parallel at the lower end of the indoor heat exchanger 51 of the indoor unit 50 passes through the second expansion valve 220 and is converted into a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant The refrigerant flows back into the lower refrigerant pipe 210b of the above-mentioned dehumidification heat exchanger 210, and the refrigerant passed through the suction side 12 of the above-mentioned compressor 10 and circulates to the compressor 10. The indoor air flowing into the front surface of the above-mentioned indoor unit 50 passes through the heat exchanger of the lower refrigerant pipe 210b of the above-mentioned dehumidification heat exchanger 210 and the air is cooled and dehumidified. The cooled and dehumidified air passes through the heat exchanger of the upper refrigerant pipe 210a and the air temperature is increased. Then, it passes through the indoor heat exchanger 51 and is cooled and dehumidified, and is supplied to the room. The above-mentioned control unit 400 receives the temperature and humidity measured in real time at the indoor supply point and The surface temperature of the outdoor heat exchanger 31 and the humidity flowing into the outdoor heat exchanger 31 are controlled at preset values. The control method of the heat pump includes: a control method of the refrigeration pipe 100, in which, in the cooling operation mode, the dehumidification pipe 200 is closed (OFF), and the indoor heat exchanger 51 is converted to function as an evaporator, and the indoor supply is controlled at a preset temperature and humidity by supplying refrigerant; a control method of the dehumidification pipe 200, in which, in the dehumidification operation mode, the refrigeration pipe 100 and the heating pipe 300 are closed, and refrigerant is supplied to the dehumidification heat exchanger 210 to control the indoor supply at a preset temperature and humidity;And the control method of the heating pipe 300, in the heating operation mode, the dehumidification pipe 200 will be closed, the indoor heat exchanger 51 is converted to play the role of a condenser, and the indoor supply is controlled at a preset temperature and humidity by supplying refrigerant. In the cooling and dehumidification simultaneous operation mode, the cooling pipe 100 and the dehumidification pipe 200 are operated simultaneously. In the heating and dehumidification simultaneous operation mode, the heating pipe 300 and the dehumidification pipe 200 are operated simultaneously, forming a heat pump. The discharge side 11 of the compressor 10 is branched into two refrigerant supply pipes, and by controlling the opening and closing of each valve, one side is directed to the cooling pipe 100 and the heating pipe 30. 0, and supplies high-temperature, high-pressure refrigerant to the dehumidification pipe 200 on the other side. The control unit 400 measures the surface temperature of the outdoor heat exchanger 31 and the humidity and temperature of the incoming air to determine whether to perform defrost. When defrost conditions are met, the multiple reheat pipes 70 equipped with electric heating rods 71 installed on the inlet side of the outdoor unit 30 are selectively and simultaneously operated. In the simultaneous cooling and dehumidification mode and the simultaneous heating and dehumidification mode, the control unit 400 controls and adjusts the refrigerant supply amount branched from the discharge side 11 of the compressor 10 to ensure that the real-time temperature and humidity at the indoor supply point reach the preset temperature and humidity.

[0036] Below, refer to Figures 1 to 6 , a cooling and heating heat pump system and a control method having a dehumidification unit in an indoor unit according to a preferred embodiment of the present invention are described in detail.

[0037] Figure 1 To illustrate a simplified diagram of a refrigeration heat pump system having a dehumidification unit in an indoor unit according to the present invention, the heat pump system includes a refrigeration pipe 100, which allows the high-temperature and high-pressure refrigerant discharged from the discharge side 11 of the compressor 10 to pass through the four-way valve 20, pass through the outdoor unit 30 and be converted into a low-temperature and low-pressure refrigerant through the first expansion valve 40. The above-mentioned low-temperature and low-pressure refrigerant passes through the indoor heat exchanger 51 placed in the indoor unit 50 and flows into the above-mentioned four-way valve 20, and circulates again to the suction side 12 of the compressor 10, cools and dehumidifies the indoor air passing through the above-mentioned indoor heat exchanger 51 and supplies it to the room, and cools and dehumidifies the high-temperature and humid indoor air.

[0038] Furthermore, as a technical feature of the present invention, a refrigerant system separate from the refrigeration pipe 100 is formed.

[0039] The above-mentioned heat pump system includes a dehumidification pipe 200, so that the high-temperature and high-pressure refrigerant discharged to the discharge side 11 of the above-mentioned compressor 10 is discharged to the dehumidification pipe 200 formed between the discharge side 11 and the four-way valve 20. The high-temperature and high-pressure refrigerant discharged through the upper end refrigerant pipe 210a of the dehumidification heat exchanger 210 separated and placed in parallel at the lower end of the indoor heat exchanger 51 of the above-mentioned indoor unit 50 will pass through the second expansion valve 220 and be converted into a low-temperature and low-pressure refrigerant, and flow back into the lower end refrigerant pipe 210b of the above-mentioned dehumidification heat exchanger 210. The refrigerant passed through will circulate to the compressor 10 through the suction side 12 of the above-mentioned compressor 10.

[0040] The dehumidification pipe 200 allows the indoor air flowing into the front surface of the indoor unit 50 to pass through the heat exchanger of the lower end refrigerant pipe 210b of the dehumidification heat exchanger 210 and cool and dehumidify the air. After the cooled and dehumidified air passes through the heat exchanger of the upper end refrigerant pipe 210a and the air temperature is increased, it passes through the indoor heat exchanger 51 and is cooled and dehumidified and supplied to the room.

[0041] Furthermore, the indoor air is sufficiently cooled. When the humidity is high, the operation of the refrigeration pipe 100 is interrupted, and only the dehumidification pipe 200 is operated. To this end, the present invention is characterized in that a separate dehumidification heat exchanger 210 is provided within the indoor unit 50. The dehumidification heat exchanger 210 contains both high-temperature, high-pressure refrigerant and low-temperature, low-pressure refrigerant that passes through the second expansion valve 220.

[0042] To this end, the present invention is characterized in that when the control unit 400 is switched to the cooling mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the above-mentioned compressor 10 will be closed, and at the same time, the cooling and heating valve 60 will be opened, and the dehumidification operation will be performed alone. When the control unit 400 is switched to the cooling mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the above-mentioned compressor 10 will be opened, and at the same time, the cooling and heating valve 60 will be closed, and the dehumidification operation will be performed alone.

[0043] In addition, the present invention performs cooling and dehumidification operations simultaneously. When switched to cooling and dehumidification mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the compressor 10 will be opened. At the same time, the cooling and heating valve 60 will also be opened. The refrigerant discharged from the compressor 10 is distributed and supplied to the cooling pipe 100 and the dehumidification pipe 200 according to a preset ratio, and flows into each other in the liquid separator 80 installed at the front end of the compressor 10 and circulates to the compressor 10.

[0044] The indoor air passing through the dehumidification heat exchanger 210 of the dehumidification duct 200 is heated and then cooled and dehumidified by passing through the indoor heat exchanger 51 at the upper end. A characteristic of the present invention is that it operates within a supply element that precisely controls both the temperature and humidity of the indoor air, such as a semiconductor device that precisely controls the temperature of the indoor air.

[0045] Furthermore, for this purpose, the refrigerant discharged from the compressor 10 is distributed according to a preset ratio and supplied to the refrigeration pipe 100 and the dehumidification pipe 200. The distributed refrigerant amount is used to automatically adjust the opening and closing degree of the cooling and heating valve 60 and the dehumidification valve 230, so as to measure the temperature and humidity of the indoor air in real time to achieve the preset temperature and humidity.

[0046] Figure 2 To illustrate a simplified diagram of a heating heat pump system having a dehumidification unit in an indoor unit of the present invention, the present invention includes a heating pipe 300, so that the high-temperature and high-pressure refrigerant discharged from the discharge side 11 of the compressor 10 passes through the four-way valve 20, passes through the indoor heat exchanger 51 placed in the indoor unit 50 and is converted into a low-temperature and low-pressure refrigerant through the first expansion valve 40. The above-mentioned low-temperature and low-pressure refrigerant passes through the outdoor unit 30 and the four-way valve 20 to circulate back to the suction side 12 of the compressor 10, and its reverse direction forms the refrigerant circulation direction of the above-mentioned refrigeration pipe 100.

[0047] When the control unit 400 of the present invention switches to heating mode, the dehumidification valve 230 formed in the dehumidification pipe 200 on the discharge side 11 of the compressor 10 will be closed, and the cooling and heating valve 60 will be opened. As a result, the indoor air passing through the indoor heat exchanger 51 placed in the indoor unit 50 will increase in temperature and provide the set indoor air to the indoor supply point.

[0048] The technical feature of the present invention is that when the dehumidification mode is switched, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the above-mentioned compressor 10 will be opened, and at the same time, the cooling and heating valve 60 will be closed. It is used in low-temperature and humid supply places with more humidity in winter, and is the operating mode required for low-temperature and high-humidity indoor supply places such as greenhouses where plants need to grow.

[0049] Furthermore, the technical feature of the present invention is that, when switched to the heating and dehumidification mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the compressor 10 will be opened, and at the same time, the cooling and heating valve 60 will be opened together, and the refrigerant discharged from the compressor 10 will be distributed and supplied to the heating pipe 300 and the dehumidification pipe 200 according to a preset ratio, and will flow into each other in the liquid separator 80 installed at the front end of the compressor 10 and circulate to the compressor 10.

[0050] To create a low-temperature, high-humidity indoor environment, the indoor air passing through the dehumidification heat exchanger 210 of the dehumidification duct 200 is heated and then cooled and dehumidified by passing through the indoor heat exchanger 51 at the upper end. The present invention is characterized by operating within a supply element that precisely controls both temperature and humidity, such as a semiconductor device that precisely controls the temperature of the indoor air.

[0051] Furthermore, for this purpose, the refrigerant discharged from the compressor 10 is distributed according to a preset ratio and supplied to the refrigeration pipe 100 and the dehumidification pipe 200. The distributed refrigerant amount is used to automatically adjust the opening and closing degree of the cooling and heating valve 60 and the dehumidification valve 230, so as to measure the temperature and humidity of the indoor air in real time to achieve the preset temperature and humidity.

[0052] Figure 3 To illustrate a simplified diagram of the reheat pipe of the cooling and heating heat pump system of the present invention having a dehumidification unit in the indoor unit, which involves defrosting or overheating regulation of the outdoor unit 30, a plurality of reheat pipes 70 equipped with electric heating rods 71 are formed on the inlet side of the outdoor unit 30 of the heating pipe 300, and the surface temperature of the outdoor heat exchanger 31 of the outdoor unit 30 and the humidity temperature of the inflowing air into the outdoor unit 30 are measured. The control unit 400 determines whether to perform defrosting. When the defrosting conditions are reached, the electric heating rods 71 will operate, and the plurality of electric heating rods 71 will be selectively operated simultaneously to quickly perform defrosting.

[0053] The present invention includes a defrosting operation of the outdoor unit 30, measuring the temperature of the refrigerant flowing out of the outdoor unit 30 and the surface temperature of the outdoor heat exchanger 31. When the measured temperature is lower than the preset refrigerant temperature, it is judged as uncondensed refrigerant gas, so that the above-mentioned electric heating rod 71 is operated to make the temperature within the preset superheat range.

[0054] Furthermore, as another embodiment of the present invention, Figure 1 and Figure 2 As shown, the size of the dehumidification heat exchanger 210 is smaller than that of the indoor heat exchanger 51 , and the heat capacity of the indoor air exchanged from the indoor heat exchanger 51 is relatively smaller than the heat capacity based on the dehumidification heat exchanger 210 .

[0055] Furthermore, as an embodiment, when cooling and dehumidification or heating and dehumidification operations are performed together, when the size of the dehumidification heat exchanger 210 is smaller than the size of the indoor heat exchanger 51, the first indoor air flowing out of the outside of the dehumidification heat exchanger 210 flows into the indoor heat exchanger 51 and realizes heat exchange. The first indoor air that has undergone heat exchange will pass through the indoor heat exchanger 51, and the indoor air passing into the inside of the dehumidification heat exchanger 210 will increase in temperature. The second indoor air of the indoor heat exchanger 51 formed by separation on the upper side is mixed with the above-mentioned first indoor air and supplied to the indoor supply point.

[0056] Furthermore, as another embodiment, when the size of the dehumidification heat exchanger 210 is the same as that of the indoor heat exchanger 51 , the indoor air that has passed through the dehumidification heat exchanger 210 and has its temperature increased will all pass through the indoor heat exchanger 51 and be supplied to the indoor supply point.

[0057] Another technical feature of the present invention is that the dehumidification heat exchanger 210 of the dehumidification pipe 200 that performs a dehumidification function is formed so that the upper end functions as a condenser and the lower end functions as an evaporator. For dehumidification efficiency, the heat capacity of the condenser structure is greater than the heat capacity of the evaporator structure. Usually, there is a relative heat difference between the above-mentioned condenser and evaporator in the range of 1.3 times to 1.4 times.

[0058] To this end, the present invention is characterized in that the number of refrigerant tubes forming the upper refrigerant pipe 210a that functions as a condenser is greater than the number of refrigerant tubes forming the lower refrigerant pipe 210b that functions as an evaporator. As an embodiment, the upper refrigerant pipe 210a is arranged in two rows and the lower refrigerant pipe 210b is arranged in one row.

[0059] Figure 4 This is a schematic diagram showing the refrigerant path of the outdoor heat exchanger of the cooling and heating heat pump system of the present invention, which has a dehumidification unit in the indoor unit. Figure 4 The structure is used to increase the efficiency of the outdoor heat exchanger 35. The refrigerant flowing into the outdoor heat exchanger 35 formed by multiple refrigerant flow paths undergoes heat exchange internally, and flows out of the above-mentioned outdoor heat exchanger 35 and is mixed and stored, so that the mixed and stored refrigerant flows back into the outdoor heat exchanger 35 and performs heat exchange, so that the refrigerant that can be mixed with the refrigerant gas and the refrigerant liquid can undergo heat exchange with the refrigerant gas.

[0060] To this end, in the present invention, the multiple refrigerant branch passages of the outdoor heat exchanger 35 of the outdoor unit 30 are formed by an upper end passage portion 35a, a middle end passage portion 35b, and a lower end passage portion 35c. The upper end passage portion 35a allows the refrigerant to flow into the upper end portion to form a preset refrigerant passage flow path, so that the refrigerant flows out from the upper end portion and flows into the outdoor refrigerant liquid collecting portion 38 located at the lower end of the outer side of the outdoor heat exchanger 35. The middle end passage portion 35b allows the refrigerant to flow into the middle end portion to form a preset refrigerant passage flow path, so that the refrigerant flows out from the middle end portion and flows into the outdoor refrigerant liquid collecting portion 38. The lower end passage portion 35c allows the refrigerant to flow into the lower end portion to form a preset refrigerant passage flow path, so that the refrigerant flows out from the lower end portion and flows into the outdoor refrigerant liquid collecting portion 38. The refrigerant mixed in the outdoor refrigerant liquid collecting portion 38 flows back into the outdoor heat exchanger 35 to realize heat exchange, and flows out from the outdoor heat exchanger 35 again.

[0061] Figure 5 This is a flowchart showing the cooling, heating, dehumidification and defrosting control by the control method of the heat pump provided with a dehumidification unit in the indoor unit according to the present invention. Figure 6 This is a schematic diagram illustrating a control method of a heat pump including a dehumidifying unit in an indoor unit according to the present invention.

[0062] Figures 1 to 4 This is a refrigerant system diagram and a simplified diagram of the main structure used in the control method of the present invention. The heat pump control method of the present invention is characterized in that an indoor heat exchanger 51 is separately installed in the indoor unit 50 and a dehumidification heat exchanger 210 is installed at its lower end separately therefrom. The above-mentioned cooling and heating heat pump includes a control unit 400, and the control unit 400 includes: a cooling pipe 100 and a heating pipe 300, an outdoor heat exchanger 31 connected to the outdoor unit 30, which is formed by connecting the indoor heat exchanger 51 and the outdoor heat exchanger 31 to each other; and a dehumidification pipe 200, which is formed separately from the above-mentioned cooling pipe 100 and heating pipe 300, and includes an upper refrigerant pipe 210a and a lower refrigerant pipe 210b, the above-mentioned upper refrigerant pipe 210a plays the role of a condenser in the dehumidification heat exchanger 210, and the above-mentioned lower refrigerant pipe 210b plays the role of an evaporator.

[0063] Figure 1 To illustrate a simplified diagram of a refrigeration and dehumidification refrigerant system diagram based on a control method of a heat pump with a dehumidification unit in an indoor unit according to the present invention, the heat pump system forms a refrigeration pipe 100, so that the high-temperature and high-pressure refrigerant discharged from the discharge side 11 of the compressor 10 passes through the four-way valve 20, passes through the outdoor unit 30 and is converted into a low-temperature and low-pressure refrigerant through the first expansion valve 40. The above-mentioned low-temperature and low-pressure refrigerant passes through the indoor heat exchanger 51 placed in the indoor unit 50 and flows into the above-mentioned four-way valve 20, and circulates again to the suction side 12 of the compressor 10. The refrigeration pipe 100 cools and dehumidifies the indoor air passing through the above-mentioned indoor heat exchanger 51 and supplies it to the room, and cools and dehumidifies the high-temperature and humid indoor air.

[0064] Furthermore, as a technical feature of the present invention, a refrigerant system separate from the refrigeration pipe 100 is formed.

[0065] The above-mentioned heat pump system includes a dehumidification pipe 200. The high-temperature and high-pressure refrigerant discharged to the discharge side 11 of the above-mentioned compressor 10 is discharged to the dehumidification pipe 200 formed between the discharge side 11 and the four-way valve 20. The high-temperature and high-pressure refrigerant discharged through the upper end refrigerant pipe 210a of the dehumidification heat exchanger 210 separated and placed in parallel at the lower end of the indoor heat exchanger 51 of the above-mentioned indoor unit 50 will pass through the second expansion valve 220 and be converted into a low-temperature and low-pressure refrigerant, and flow back into the lower end refrigerant pipe 210b of the above-mentioned dehumidification heat exchanger 210. The refrigerant passed through will circulate to the compressor 10 through the suction side 12 of the above-mentioned compressor 10.

[0066] The dehumidification pipe 200 allows the indoor air flowing into the front surface of the indoor unit 50 to pass through the heat exchanger of the lower end refrigerant pipe 210b of the dehumidification heat exchanger 210 and the air is cooled and dehumidified. After the cooled and dehumidified air passes through the heat exchanger of the upper end refrigerant pipe 210a and the temperature is increased, it passes through the indoor heat exchanger 51 and is cooled and dehumidified, and is supplied to the room.

[0067] Furthermore, the indoor air is sufficiently cooled. When the humidity is high, the operation of the refrigeration pipe 100 is interrupted, and only the dehumidification pipe 200 is operated. To this end, the present invention is characterized in that a separate dehumidification heat exchanger 210 is provided within the indoor unit 50. The dehumidification heat exchanger 210 contains both high-temperature, high-pressure refrigerant and low-temperature, low-pressure refrigerant that passes through the second expansion valve 220.

[0068] To this end, the present invention is characterized in that when the control unit 400 is switched to the cooling mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the above-mentioned compressor 10 will be closed, and at the same time, the cooling and heating valve 60 will be opened, and the cooling operation will be performed alone. When the control unit 400 is switched to the cooling mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the above-mentioned compressor 10 will be opened, and at the same time, the cooling and heating valve 60 will be closed, and the dehumidification operation will be performed alone.

[0069] In addition, the present invention performs cooling and dehumidification operations simultaneously. When switched to cooling and dehumidification mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the compressor 10 will be opened. At the same time, the cooling and heating valve 60 will also be opened. The refrigerant discharged from the compressor 10 is distributed and supplied to the cooling pipe 100 and the dehumidification pipe 200 according to a preset ratio, and flows into each other in the liquid separator 80 installed at the front end of the compressor 10 and circulates to the compressor 10.

[0070] The indoor air passing through the dehumidification heat exchanger 210 of the dehumidification duct 200 is heated and then cooled and dehumidified by the indoor heat exchanger 51 at the upper end. The present invention is characterized in that it operates within a supply element that precisely controls both temperature and humidity, such as a semiconductor device that precisely controls the temperature of the indoor air.

[0071] In addition, the control unit 400 of the present invention controls the refrigerant supply amount branched from the discharge side 11 of the above-mentioned compressor 10, so as to achieve the preset temperature and humidity based on the real-time temperature and humidity of the indoor supply point in the simultaneous cooling and dehumidification operation mode and the simultaneous heating and dehumidification operation mode. To this end, the refrigerant discharged from the above-mentioned compressor 10 is distributed and supplied to the above-mentioned cooling and heating pipes 100, 300 and dehumidification pipe 200 according to a preset ratio. The distributed refrigerant amount is used to automatically adjust the opening and closing degree of the cooling and heating valve 60 and the dehumidification valve 230, so as to measure the temperature and humidity of the indoor air in real time to make it reach the preset temperature and humidity.

[0072] Figure 2 To illustrate a simplified diagram of a heating and dehumidifying refrigerant system diagram of a control method for a heat pump with a dehumidification unit in an indoor unit of the present invention, the present invention also includes a heating pipe 300, so that the high-temperature and high-pressure refrigerant discharged from the discharge side 11 of the compressor 10 passes through the four-way valve 20, passes through the indoor heat exchanger 51 placed in the indoor unit 50 and is converted into a low-temperature and low-pressure refrigerant through the first expansion valve 40. The above-mentioned low-temperature and low-pressure refrigerant passes through the outdoor unit 30 and the four-way valve 20 to circulate back to the suction side 12 of the compressor 10, and its reverse direction forms the refrigerant circulation direction of the above-mentioned refrigeration pipe 100.

[0073] When the control unit 400 of the present invention switches to heating mode, the dehumidification valve 230 formed in the dehumidification pipe 200 on the discharge side 11 of the compressor 10 will be closed, and the cooling and heating valve 60 will be opened. As a result, the indoor air passing through the indoor heat exchanger 51 placed in the indoor unit 50 will increase in temperature and provide the set indoor air to the indoor supply point.

[0074] The technical feature of the present invention is that when the dehumidification mode is switched, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the above-mentioned compressor 10 will be opened, and at the same time, the cooling and heating valve 60 will be closed. It is used in low-temperature and humid supply places with more humidity in winter, and is the operating mode required for low-temperature and high-humidity indoor supply places such as greenhouses where plants need to grow.

[0075] Furthermore, the technical feature of the present invention is that, when the mode is switched to heating and dehumidification mode, the dehumidification valve 230 formed on the dehumidification pipe 200 on the discharge side 11 of the compressor 10 will be opened, and at the same time, the cooling and heating valve 60 will be opened together, and the refrigerant discharged from the compressor 10 will be distributed and supplied to the heating pipe 300 and the dehumidification pipe 200 according to a preset ratio, and will flow into each other in the liquid separator 80 installed at the front end of the compressor 10 and circulate to the compressor 10.

[0076] To create a low-temperature, high-humidity indoor environment, the indoor air passing through the dehumidification heat exchanger 210 of the dehumidification duct 200 is heated and then cooled and dehumidified by the indoor heat exchanger 51 at the upper end. A characteristic of the present invention is that it operates within a supply element that precisely controls both temperature and humidity, such as a semiconductor device that precisely controls the temperature of the indoor air.

[0077] Furthermore, for this purpose, the refrigerant discharged from the compressor 10 is distributed according to a preset ratio and supplied to the refrigeration pipe 100 and the dehumidification pipe 200. The distributed refrigerant amount is used to automatically adjust the opening and closing degree of the cooling and heating valve 60 and the dehumidification valve 230, so as to measure the temperature and humidity of the indoor air in real time to achieve the preset temperature and humidity.

[0078] As described above, although the present invention is described through limited embodiments and drawings, the present invention is not limited thereto, and ordinary technicians in the technical field to which the present invention belongs can make various modifications and variations within the scope equivalent to the technical ideas of the present invention and the scope of protection of the invention described below.

Claims

1. A cooling and heating heat pump system having a dehumidification unit in an indoor unit, characterized in that: The above-mentioned heat pump system comprises: The refrigeration pipe allows the high-temperature and high-pressure refrigerant discharged from the discharge side of the compressor to pass through the four-way valve, pass through the outdoor unit, and be converted into low-temperature and low-pressure refrigerant through the first expansion valve. The low-temperature and low-pressure refrigerant passes through the indoor heat exchanger placed in the indoor unit and flows into the four-way valve to circulate back to the suction side of the compressor; and The dehumidification pipe is configured to discharge the high-temperature and high-pressure refrigerant discharged to the discharge side of the compressor to the dehumidification pipe formed between the discharge side and the four-way valve. The high-temperature and high-pressure refrigerant discharged through the upper refrigerant pipe of the dehumidification heat exchanger separated and placed in parallel at the lower end of the indoor heat exchanger of the indoor unit will pass through the second expansion valve and be converted into low-temperature and low-pressure refrigerant, and will flow back into the lower refrigerant pipe of the dehumidification heat exchanger. The refrigerant will pass through the suction side of the compressor and circulate to the compressor. The indoor air flowing into the front surface of the indoor unit passes through the heat exchanger of the lower end refrigerant pipe of the dehumidification heat exchanger and is cooled and dehumidified. The cooled and dehumidified air passes through the heat exchanger of the upper end refrigerant pipe and the air temperature is increased. Then, the air passes through the indoor heat exchanger and is cooled and dehumidified and supplied to the room. When the control unit switches to cooling mode, the dehumidification valve formed on the dehumidification pipe on the discharge side of the compressor will be closed, and at the same time, the cooling and heating valve will be opened. When the dehumidification mode is switched to, the dehumidification valve formed on the dehumidification pipe on the discharge side of the compressor will open, and at the same time, the cooling and heating valves will close. When the cooling and dehumidification mode is switched, the dehumidification valve formed on the dehumidification pipe on the discharge side of the compressor will open, and at the same time, the cooling and heating valves will also open. The refrigerant discharged from the compressor is distributed to the refrigeration pipe and the dehumidification pipe according to a preset ratio, flows into each other in the liquid separator installed at the front end of the compressor and circulates to the compressor. The heat pump system further includes a heating pipe, which allows the high-temperature and high-pressure refrigerant discharged from the discharge side of the compressor to pass through the four-way valve, pass through the indoor heat exchanger placed in the indoor unit, and be converted into low-temperature and low-pressure refrigerant through the first expansion valve, pass through the outdoor unit and pass through the four-way valve to circulate back to the suction side of the compressor. A plurality of reheat pipes equipped with electric heating rods are formed on the inlet side of the outdoor unit of the heating pipe. The surface temperature of the outdoor heat exchanger of the outdoor unit and the humidity temperature of the inflowing air into the outdoor unit are measured. The control unit determines whether to perform defrosting. When the defrosting conditions are met, the electric heating rods are activated, and the plurality of electric heating rods are selectively activated simultaneously. When the control unit switches to heating mode, the dehumidification valve formed on the dehumidification pipe on the discharge side of the compressor will be closed, and the cooling and heating valve will be opened. When the dehumidification mode is switched to, the dehumidification valve formed on the dehumidification pipe on the discharge side of the compressor will open, and at the same time, the cooling and heating valves will close. When switching to heating and dehumidification mode, the dehumidification valve formed on the dehumidification pipe on the discharge side of the compressor will open, and at the same time, the cooling and heating valves will also open. The refrigerant discharged from the compressor is distributed according to a preset ratio and supplied to the heating pipe and the dehumidification pipe, and flows into each other in the liquid separator installed at the front end of the compressor and circulates to the compressor. The outdoor heat exchanger of the outdoor unit has a plurality of refrigerant branch passages formed by an upper passage portion, a middle passage portion, and a lower passage portion. The upper end passage portion allows the refrigerant to flow into the upper end portion, forming a preset refrigerant passage flow path, and allows the refrigerant to flow out toward the upper end portion and flow into the outdoor refrigerant liquid collection portion located at the lower end of the outer side of the outdoor heat exchanger. The middle end passage portion allows the refrigerant to flow into the middle end portion, forming a preset refrigerant passage flow path, and allows the refrigerant to flow out of the middle end portion and flow into the outdoor refrigerant liquid collection portion. The lower end passage portion allows the refrigerant to flow into the lower end portion, forming a preset refrigerant passage flow path, and allows the refrigerant to flow out of the lower end portion and flow into the above-mentioned outdoor refrigerant liquid collection portion. The refrigerant mixed in the outdoor refrigerant liquid collecting portion flows back into the outdoor heat exchanger to perform heat exchange, and then flows back out of the outdoor heat exchanger.

2. The cooling and heating heat pump system having a dehumidification unit in the indoor unit according to claim 1, wherein: The number of refrigerant tubes forming the upper refrigerant pipe functioning as a condenser of the dehumidification heat exchanger is greater than the number of refrigerant tubes forming the lower refrigerant pipe functioning as an evaporator.

3. The cooling and heating heat pump system having a dehumidification unit in the indoor unit according to claim 1 or 2, characterized in that: The heat capacity of the above-mentioned dehumidification heat exchanger is smaller than the heat capacity of the indoor heat exchanger.

4. A method for controlling a cooling and heating heat pump having a dehumidification unit in an indoor unit, characterized in that: The indoor unit is equipped with an indoor heat exchanger and a dehumidification heat exchanger which is installed at the lower end of the indoor unit. The cooling and heating heat pump includes a control unit, which includes: The cooling pipe and the heating pipe are connected to the outdoor heat exchanger of the outdoor unit, and the indoor heat exchanger and the outdoor heat exchanger are connected to each other; and The dehumidification pipe is formed separately from the above-mentioned cooling pipe and heating pipe, and includes an upper refrigerant pipe and a lower refrigerant pipe. The upper refrigerant pipe acts as a condenser in the dehumidification heat exchanger, and the lower refrigerant pipe acts as an evaporator. The high-temperature and high-pressure refrigerant discharged to the discharge side of the compressor is discharged to the dehumidification pipe formed between the discharge side and the four-way valve. The high-temperature and high-pressure refrigerant discharged passes through the upper end refrigerant pipe of the dehumidification heat exchanger separated and placed in parallel at the lower end of the indoor heat exchanger of the above-mentioned indoor unit and is converted into low-temperature and low-pressure refrigerant through the second expansion valve. The above-mentioned low-temperature and low-pressure refrigerant flows back into the lower end refrigerant pipe of the above-mentioned dehumidification heat exchanger. The refrigerant passes through the suction side of the above-mentioned compressor and circulates to the compressor. The indoor air flowing into the front surface of the indoor unit passes through the heat exchanger of the lower end refrigerant pipe of the dehumidification heat exchanger and is cooled and dehumidified. The cooled and dehumidified air passes through the heat exchanger of the upper end refrigerant pipe and the air temperature is increased. Then, the air passes through the indoor heat exchanger and is cooled and dehumidified and supplied to the room. The control unit receives the temperature and humidity measured in real time at the indoor supply point, the surface temperature of the outdoor heat exchanger, and the humidity flowing into the outdoor heat exchanger and controls them to a preset value. The control method of the heat pump includes: The control method of the refrigeration pipe is as follows: in the cooling operation mode, the dehumidification pipe will be closed, and the indoor heat exchanger will be converted to function as an evaporator, and the indoor supply point will be controlled at a preset temperature and humidity by supplying refrigerant; A method for controlling the dehumidification pipe, in which, in the dehumidification operation mode, the cooling pipe and the heating pipe are closed, and refrigerant is supplied to the dehumidification heat exchanger to control the indoor supply at a preset temperature and humidity; and The control method of the heating pipe is as follows: in the heating operation mode, the dehumidification pipe will be closed, and the indoor heat exchanger will be converted to play the role of a condenser, and the indoor supply will be controlled at the preset temperature and humidity by supplying refrigerant. In the cooling and dehumidification simultaneous operation mode, the above cooling pipes and dehumidification pipes are operated simultaneously. In the heating and dehumidification simultaneous operation mode, the heating pipe and the dehumidification pipe are operated at the same time. The discharge side of a compressor forming a heat pump branches into two refrigerant supply pipes. By controlling the opening and closing of each valve, one side supplies high-temperature and high-pressure refrigerant to the above-mentioned cooling pipe and heating pipe, and the other side supplies high-temperature and high-pressure refrigerant to the dehumidification pipe. The control unit measures the surface temperature of the outdoor heat exchanger and the humidity and temperature of the incoming air to determine whether to perform defrosting. When the defrosting conditions are met, the control unit selectively and simultaneously operates a plurality of reheat pipes equipped with electric heating rods provided on the inlet side of the outdoor unit. In the cooling and dehumidification simultaneous operation mode and the heating and dehumidification simultaneous operation mode, the control unit controls and adjusts the refrigerant supply amount branched from the discharge side of the compressor so that the real-time temperature and humidity at the indoor supply point reach the preset temperature and humidity.

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