JP2002090009A - Defrosting device of outdoor unit of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform defrosting operation of an outdoor unit of a heat pump type air conditioner by effectively using waste heat of a fuel cell power generation system. SOLUTION: Water supplied to a fuel cell 1 by a water supply pipe 8 cools the fuel cell 1 to recover waste heat of the fuel cell 1, and becomes hot water before being discharged through a hot water discharge pipe 9 and stored in a hot water tank 10. A heat exchanger 16 on the outdoor unit 14 is provided with a defrosting device 28. The defrosting device 28 comprises a pipe 29 for guiding a cooling medium heated by the fuel cell 1 upward of the heat exchanger 16, and a shower unit 30 on the pipe 29. A sensor 33 for detecting adhesion of frost on the heat exchanger 16 is provided on the defrosting device 28. The pipe 29 is branched from the pipe 9. A controller 35 opens a solenoid valve 34 provided in the pipe 29 when the heat exchanger 16 is judged to be frosted on the basis of a detection signal of the sensor 33 so as to supply part of hot water to the pipe 29 and the hot water is showered onto the heat exchanger 16 from the shower unit 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defroster for an outdoor unit of an air conditioner, and more particularly to a defroster for an outdoor unit of an air conditioner that makes effective use of exhaust heat of a fuel cell power generation system.

[0002]

2. Description of the Related Art In recent years, use of a fuel cell as a power energy source for buildings and houses has been studied. As is well known, a fuel cell utilizes, for example, an electromotive force generated by chemically reacting oxygen and hydrogen, and excellent conversion efficiency can be obtained because chemical energy is directly converted to electric energy. .

[0003] Since the operation of a fuel cell involves heat generation, it is important to recover heat generated during power generation and use it efficiently.
It has become a challenge. Then, cooling water is supplied to the fuel cell for cooling. In order to operate the fuel cell stably and efficiently, the supply temperature of the cooling water is preferably set to about 30 to 40 ° C. In addition, since it is not efficient to operate the fuel cell intermittently, the fuel cell is normally operated continuously, and high-temperature cooling water of about 60 to 80 ° C. is constantly discharged from the fuel cell. Become.

For example, Japanese Patent Application Laid-Open No. 11-281072 discloses an air conditioner having an outdoor heat exchanger and an indoor heat exchanger for performing a heat pump cycle for pumping outdoor heat into a room, a fuel cell, and a fuel cell. A hot-water supply device that stores heat that has been heated by exchanging heat with exhaust heat, and guides high-temperature air discharged from the fuel cell to the outdoor heat exchanger when the air conditioner is performing a heating operation; There is disclosed a heat supply system having exhaust switching means for guiding high-temperature air discharged from the fuel cell to the hot water supply device when the air conditioner is not heating.

In this system, during a heating operation by the air conditioner, the exhaust gas switching means guides the high-temperature air discharged from the fuel cell to the outdoor heat exchanger of the air conditioner, so that the high-temperature air discharged from the fuel cell is used for the air conditioner. Heat can be recovered by the outdoor heat exchanger, and the recovered heat from the high-temperature air can increase the efficiency of heat exchange. Further, when the air conditioner is not performing the heating operation, the exhaust gas switching means guides the high-temperature air discharged from the fuel cell to the hot water supply device, so that heat can be recovered from the high-temperature air discharged from the fuel cell by the hot water supply device. Since the temperature of the water can be raised by the heat recovered from the air and supplied to the outside as warm water, the energy cost required to raise the temperature of the water can be reduced or eliminated.
Here, the time when the air conditioner is not performing the heating operation includes, for example, a time when the operation is stopped, a time when the cooling operation is performed, a time when the dehumidifying operation is performed, and a time when the air is blown.

[0006]

However, in the conventional apparatus, when performing the heating operation, the exhaust heat of the fuel cell cannot be used for heating the water of the water heater. During the heating operation, all exhaust heat of the fuel cell is led to the outdoor heat exchanger of the air conditioner. Therefore, this device does not require defrosting of the outdoor unit, but the problem that the exhaust heat of the fuel cell in the hot water supply device cannot be used effectively. There is.

[0007] In the heat pump type air conditioner, even if the temperature around the outdoor unit is not as high as several tens of degrees during the heating operation, heating is possible if the temperature does not cause frost.
During the heating operation, sufficient heating can be performed without always supplying the exhaust heat of the fuel cell to the outdoor unit. However, if the operation is continued in a state where the frost is attached to the heat exchanger of the outdoor unit, the frost grows, the efficiency of heat exchange is deteriorated, and heating cannot be performed. Therefore, in a general heat pump type air conditioner, when frost is formed, a defrosting (defrosting) operation is required.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to simply defrost an outdoor unit of a heat pump type air conditioner by effectively utilizing exhaust heat of a fuel cell power generation system. It is an object of the present invention to provide a defrosting device for an outdoor unit of an air conditioner that can be performed.

[0009]

According to the first aspect of the present invention, a cooling medium heated by exhaust heat of a fuel cell power generation system is supplied to an outdoor unit of a heat pump air conditioner. A pipe was provided to guide the defrosting of the heat exchanger mounted on the outdoor unit.

[0010] In the present invention, the cooling medium heated by the exhaust heat of the fuel cell system is used for defrosting the heat exchanger provided in the outdoor unit of the heat pump air conditioner. Since the time required for defrosting is relatively short, the exhaust heat of the fuel cell power generation system is used for hot water supply compared to the conventional device that supplies the exhaust heat of the fuel cell to the heat exchanger of the outdoor unit during the heating operation of the air conditioner. Can be used effectively.

According to a second aspect of the present invention, in the first aspect of the present invention, the pipe is branched from a main pipe for guiding a cooling medium used for cooling the fuel cell to a hot water storage tank. A valve is provided that can be switched to allow the cooling medium to flow from the main pipe to the branch pipe during the defrosting.

According to the present invention, the cooling medium for defrosting is guided to the heat exchanger of the outdoor unit by the branch pipe branched from the main pipe for guiding the cooling medium used for cooling the fuel cell to the hot water tank. Therefore, a part of the cooling medium can be supplied to the hot water tank even during defrosting.

According to a third aspect of the present invention, in the second aspect of the invention, the cooling medium is water that is used for cooling a fuel cell and then stored in a hot water tank and used as hot water. The branch pipe is configured to apply a cooling medium to a heat exchanger mounted on the outdoor unit.

In the present invention, water (for example, tap water) is used as a cooling medium, and hot water heated by exhaust heat of the fuel cell is directly applied to the heat exchanger during defrosting, so that frost is efficiently removed. Further, the efficiency of warming the water is improved as compared with a configuration in which the heat of the refrigerant is used to heat the water for hot water supply using the heat exchanger.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the main pipe forms a closed loop, and uses a refrigerant heated by cooling the fuel cell and heated as a heat source for hot water supply. The branch pipe is also provided so as to form a closed loop.

In the present invention, the refrigerant used to utilize the exhaust heat of the fuel cell is circulated in the closed loop main pipe. And the refrigerant | coolant used for the defrost of the heat exchanger with which the outdoor unit was equipped also flows through the branch piping which forms a closed loop. Since the refrigerant circulates in each pipe of the closed loop, a liquid other than water can be used, and the refrigerant may freeze in each pipe in a state where the operation of the fuel cell is stopped in winter (severely cold season) by using an antifreeze. There is no.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the sensor for detecting that frost has adhered to the heat exchanger is provided to the defroster. Is provided, and the flow rate of the cooling medium in the pipe is controlled based on the detection signal of the sensor. According to the present invention, the defrosting operation is automatically performed when defrosting is required. At that time, since the flow rate in the pipe for guiding the cooling medium to the heat exchanger of the outdoor unit is controlled, defrosting is performed efficiently.

[0018]

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG.

As shown in FIG. 1, the fuel cell power generation system includes a fuel cell unit in which a fuel cell 1, a reformer 2, and an inverter 3 are accommodated in one housing 4. The fuel cell 1 is composed of, for example, a polymer electrolyte fuel cell, is supplied with raw fuel reformed in the reformer 2 and air, and reacts hydrogen in the reformed gas with oxygen in the air to produce a direct current. Generates electrical energy. As the raw fuel, for example, city gas or LP gas is used.

The inverter 3 has an input side connected to the output side of the fuel cell 1, and an output side connected to a load 6 via a switchboard 5. The switchboard 5 is also connected to a system power supply (commercial power supply) 7. The switchboard 5 is controlled by a control device (not shown).
When the power supplied from the fuel cell 1 is less than the required power of the load 6, the system power supply 7 supplements the power.

The fuel cell power generation system includes an exhaust heat recovery facility including a water supply pipe 8, a hot water discharge pipe 9 as a main pipe, and a hot water storage tank 10. Water supply pipe 8 is a water pipe (not shown)
, And an electromagnetic valve 11 is provided in the middle thereof.
The water supplied to the fuel cell 1 through the water supply pipe 8 is
The exhaust heat of the fuel cell 1 is recovered by cooling the water, and is discharged as hot water (hot water) from the drain pipe 9. That is, the exhaust heat recovery facility also performs the function of cooling the fuel cell 1. Hot water tank 1
A hot water supply pipe 12 is connected to a lower portion of 0. Hot water supply pipe 12
Is connected to a pipe to a bath, kitchen or the like (not shown).

As shown in FIG. 1, the air conditioner 13 includes an outdoor unit 14 arranged outside the house and an indoor unit 15 arranged inside the house. The heat exchanger 1 is installed in the outdoor unit 14.
6, a fan 17, a capillary tube 18, and a check valve 19 are provided. The capillary tube 18 and the check valve 19 are connected in parallel. The indoor unit 15 also includes a heat exchanger 20, a fan 21, a capillary tube 22, and a check valve 23. The indoor unit 15 is further provided with a compressor 24 and a four-way valve 25. The capillary tube 22 and the check valve 23 are also connected in parallel. Heat exchanger 1
The tubes 6 and 20 are connected via a pipe 26 in which the capillary tubes 18 and 22 are provided on the way.

The four-way valve 25 is connected to the compressor 2 by a pipe 27a.
A port I connected to a discharge port of the compressor 4, a port II connected to a suction port of the compressor 24 by a pipe 27b,
Port III connected to heat exchanger 16 by pipe 27c
And a port connected to the heat exchanger 20 by a pipe 27d
With IV.

The four-way valve 25 is operated by a command from a control device (not shown) of the air conditioner 13 to control the port I during heating operation.
The gas entered from the port IV passes through the heat exchanger 20 and the check valve 23 of the indoor unit 15 and the capillary tube 18 and the heat exchanger 16 of the outdoor unit 14, and enters the four-way valve 25 from the port III through the port III. It functions so as to be drawn out of the port II and drawn into the suction port of the compressor 24. During the cooling operation, gas entering from port I exits from port III, and the heat exchanger 16 and the check valve 19 of the outdoor unit 14 and the indoor unit 1
5 through the capillary tube 22 and the heat exchanger 20, enters the four-way valve 25 from the port IV, and then switches from the port II so as to be sucked into the suction port of the compressor 24.

The heat exchanger 16 mounted on the outdoor unit 14 is provided with a defroster 28. As shown in FIG. 2, the defrosting device 28 includes a pipe 29 serving as a branch pipe that guides a heated cooling medium used for cooling the fuel cell 1 to a position above the heat exchanger 16 during defrosting, and a pipe 29. A shower section 30 is provided, and a tray 31 provided below the heat exchanger 16 is provided. A drain pipe 32 is connected to the tray 31. Further, the defrosting device 28 includes a sensor 33 that detects that frost has adhered to the heat exchanger 16. The sensor 33 is configured by a temperature sensor that detects a temperature near the heat exchanger 16.

As shown in FIG. 1, the pipe 29 is
Is branched from a hot water discharge pipe 9 for guiding a cooling medium used for cooling the hot water to a hot water storage tank 10. The pipe 29 is provided with an electromagnetic valve 34 as a valve capable of switching so that the cooling medium can flow into the pipe 29 from the hot water discharge pipe 9 at the time of defrosting. The control device 35 controls the heat exchanger 1 based on the detection signal of the sensor 33.
When it is determined that frost has adhered to 6, an open command is output to the electromagnetic valve 34, and the electromagnetic valve 34 is opened for a predetermined time.

Next, the operation of the device configured as described above will be described. When the fuel cell 1 is operated, the solenoid valve 11 is opened, and tap water is guided from the water supply pipe 8 to the fuel cell 1. DC power generated by the fuel cell 1 is converted into AC by the inverter 3 and supplied to the load 6 via the switchboard 5. Fuel cell 1
The hot water cooled and heated is passed through a hot water discharge pipe 9 and the hot water storage tank 1
It is led to 0. Hot water stored in hot water storage tank 10 is supplied by hot water supply pipe 12.
Is supplied to the bath, kitchen, etc.

During the heating operation of the air conditioner 13, the four-way valve 2
By the action of 5, the discharge gas of the compressor 24 moves in the order of the heat exchanger 20 of the indoor unit 15 → the check valve 23 → the capillary tube 18 of the outdoor unit 14 → the heat exchanger 16 → the suction port of the compressor 24. Then, the heat exchanger 16 functions as an evaporator, the refrigerant takes away the heat of the outside air and evaporates, the evaporated refrigerant gas is compressed by the compressor 24, and the heat exchanger 2 of the indoor unit 15
Dissipates heat at 0.

If the heating operation is continued in a state where the outside air temperature is lowered, the heat exchanger 16 becomes frosted. If the heating operation is performed in a state where the frost is present on the heat exchanger 16, the heating efficiency becomes very poor. When frost forms on the heat exchanger 16, the frost is detected by the sensor 33, and the electromagnetic valve 34 is controlled by a command from the control device 35.
Is released. As a result, the hot water storage tank 1 is
Part of the hot water discharged from the fuel cell 1 supplied to the
9 is supplied to the heat exchanger 16 from the shower unit 30. Even if the pipe 29 is not kept warm by the heat retaining material, hot water of several tens of degrees Celsius is sprayed from the shower part 30, so that the frost attached to the heat exchanger 16 is efficiently removed. The hot water sprayed from the shower unit 30 is received by the receiving tray 31 together with the removed frost, and is discharged to the duct through the drain pipe 32. Then, after a lapse of a predetermined time necessary for removing frost, the electromagnetic valve 34 is closed.

This embodiment has the following effects. (1) A pipe 29 that is used for cooling the fuel cell 1 and guides heated refrigerant is provided when the heat exchanger 16 mounted on the outdoor unit 14 of the air conditioner 13 is defrosted. Therefore, defrosting of the heat exchanger 16 can be easily performed by effectively utilizing the exhaust heat of the fuel cell power generation system.

(2) At the time of defrosting, since the refrigerant used for cooling the fuel cell 1 and heated is directly applied to the heat exchanger 16, the frost can be efficiently removed in a short time. Therefore, most of the heat generated in the fuel cell 1 can be used for hot water.

(3) The pipe 29 is branched from the hot water discharge pipe 9, and the pipe 29 is provided with an electromagnetic valve 3 capable of switching a cooling medium (discharge hot water) from the hot water discharge pipe 9 to the pipe 29 during defrosting.
4 are provided. Therefore, a part of the cooling medium can be supplied to the hot water storage tank 10 even during defrosting.

(4) Since the sensor 33 for detecting that frost has adhered to the heat exchanger 16 is provided, the defrosting operation is automatically performed when defrosting is required. (5) In the hot water storage tank 10, water whose temperature has been increased by cooling the fuel cell 1 is stored. Therefore, compared to a configuration in which the heat of the coolant is used to heat the water for hot water supply in the hot water storage tank 10 using the heat exchanger, the efficiency of heating the water is improved.

(6) Compared with a configuration in which the cooling medium of the fuel cell 1 is circulated in a closed loop and the water in the hot water storage tank 10 is heated by the heat exchanger, a heat exchanger and a pump for circulating the refrigerant are unnecessary. And the structure is simplified, and the manufacturing cost is reduced.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. This embodiment is significantly different from the previous embodiment in that the refrigerant used for cooling the fuel cell 1 is used again for cooling the fuel cell 1, that is, the refrigerant circulates in a closed loop pipe. . The configuration of the air conditioner 13 is the same, and the configuration of the defroster 28 is different. The same parts as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In addition, a switchboard 5 for power supply
The illustration of the air conditioner 13 is omitted, and only the heat exchanger 16 is illustrated.

A water supply pipe 36a for supplying tap water is connected to a lower part of the hot water storage tank 10, and a hot water supply pipe 36b is connected to an upper part thereof. In the middle of a pipe 37 as a main pipe forming a closed loop through which a medium for cooling the fuel cell 1 circulates,
A heat exchanger 38 for heating the water in 0 is provided. The pipe 37 is provided with a pump 39 downstream of the heat exchanger 38. A branch pipe 40 is provided in the pipe 37 downstream of the pump 39 so as to form a closed loop. Solenoid valves 34 and 41 are provided in the middle of the branch pipe 40 and between two branch points of the branch pipe 40 from the pipe 37. The branch pipe 40 is disposed so as to meander along the heat exchanger 16 at a position corresponding to the heat exchanger 16.

In the apparatus of this embodiment, the water in the hot water storage tank 10 is cooled by the cooling medium circulating in the pipe 37.
8 is heated. When the defrosting operation is unnecessary, the electromagnetic valve 34 is closed and the electromagnetic valve 41 is kept open, and the cooling medium circulates in the pipe 37. On the other hand, when defrosting is required, the solenoid valve 34 is opened and the solenoid valve 41 is kept closed. Then, the cooling medium heated by the fuel cell 1 is guided to the heat exchanger 38 via the pipe 37 and heats the water in the hot water storage tank 10, and then guided to the branch pipe 40 via the pump 39, and The frost adhering to 16 is removed by heating. After that, it is supplied to the fuel cell 1.

This embodiment has the following effects in addition to the effects (1) and (4) of the above embodiment. (7) The fuel cell 1 is cooled by a cooling medium circulating in a closed loop, and the hot water storage tank 10 cools the fuel cell 1 and uses the cooling medium whose temperature is raised as a heat source. Is stored. Therefore, the refrigerant is closed pipe 3
Since it circulates through the inside of the pipe 7, liquids other than water can also be used, and by using an antifreeze liquid, there is no possibility that the refrigerant will freeze in the pipe 37 even when the operation of the fuel cell 1 is stopped in winter (severely cold season).

(8) The defrosting cooling medium flows through the closed loop branch pipe 40 after heating the water in the hot water storage tank 10, so that the water in the hot water storage tank 10 is reliably heated even during the defrosting operation. In addition, the exhaust heat of the fuel cell power generation system can be used more effectively.

(9) Water is supplied to the hot water storage tank 10 from below, and hot water is supplied from above. Therefore, high-temperature water is stored in the hot water storage tank 10 on the upper side and low-temperature water is stored on the lower side, and before the entire water in the hot water storage tank 10 is heated to the predetermined temperature, the upper water is heated to the predetermined temperature. It is heated and ready for use.

The embodiment is not limited to the above, and may be configured, for example, as follows. In the device configured to store the water that has cooled the fuel cell 1 in the hot water tank 10 as in the first embodiment,
Instead of branching off from the main pipe (hot water discharge pipe 9),
The water after cooling and heating the fuel cell 1 may be directly guided to the heat exchanger 16. For example, a pipe for defrosting and a water supply pipe for supplying water via the fuel cell 1 to the pipe are provided. The water supply pipe is provided with a valve for supplying water to the fuel cell 1 when defrosting.

In the first embodiment, the pipe 29
Instead of providing the electromagnetic valve 34 in the middle, a three-way valve is provided at the branch between the hot water discharge pipe 9 and the pipe 29, and the hot water is supplied to the hot water storage tank 10 except when defrosting. It may be made to supply to. In this case, the hot water can be reliably applied to the heat exchanger 16 at the time of defrosting.

In the second embodiment, instead of providing the solenoid valves 34 and 41 in the branch pipe 40 and the pipe 37, a three-way valve is provided in the upstream branch of the two branches of the branch pipe 40. Alternatively, it may be configured such that the discharged hot water is passed to the pipe 37 side during defrosting, and the discharged hot water is passed to the branch pipe 40 side during defrosting. In this case, 2
There is no need to provide the individual solenoid valves 34 and 41, and the configuration is simplified.

In a configuration in which a refrigerant for cooling the fuel cell 1 is circulated and used, the pump 39 may be provided on the upstream side instead of the downstream side of the heat exchanger 38. But,
Since the temperature of the refrigerant is lower on the downstream side, the durability is improved.

As the sensor 33 for detecting that frost has adhered to the heat exchanger 16, an optical sensor may be used instead of the temperature sensor. For example, in a configuration using a reflection type optical sensor, a reflection sheet having good light reflectivity is fixed to a predetermined position of the heat exchanger 16, and light reflected from the reflection sheet is detected by the sensor. When the heat exchanger 16 is frosted, the frost also adheres to the surface of the reflection sheet and the reflected light is weakened, and it is detected that the frost is adhered. In the configuration using a transmission type optical sensor, the light emitting unit is arranged so that the light emitted from the light emitting unit passes very near the surface of the heat exchanger 16, and the light receiving unit detects the light emission. I do. If the frost adheres to the heat exchanger 16, the projection is interrupted, so that the frost can be detected.

Instead of directly detecting the formation of frost on the heat exchanger 16, the conditions for the formation of frost are determined in advance by experiments or the like from the temperature near the outdoor unit 14 and the duration of the heating operation. The defrosting operation may be performed for a predetermined time when conditions for adhering frost are established from the condition and the heating operation continuation time. In this case, it is not necessary to provide the sensor 33 in the defrosting device 28.

A manually operated valve may be provided in place of the electromagnetic valves 34 and 41, and the refrigerant may be manually supplied to the pipe 29 or the branch pipe 40 when frost is formed. ○ Instead of using only the heat of the cooling water of the fuel cell 1 to heat the water in the hot water storage tank 10, the exhaust heat of the reformer 2 is recovered by a heat medium and the heat medium is recovered through a pipe. May be supplied to another heat exchanger provided in the hot water storage tank 10 to heat the water in the hot water storage tank 10. In this case, the thermal efficiency of the fuel cell power generation system is improved.

The inventions (technical ideas) other than the claims described in the above embodiments will be described below. (1) In the invention according to any one of claims 1 to 4, whether or not a defrosting operation is necessary is determined based on an outside air temperature and a continuous heating operation time.

[0049]

As described in detail above, claims 1 to 5 are provided.
According to the invention described in (1), defrosting of the outdoor unit of the heat pump air conditioner can be easily performed by effectively utilizing the exhaust heat of the fuel cell power generation system.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a fuel cell power generation system according to a first embodiment.

FIG. 2 is a schematic diagram of a defrosting device.

FIG. 3 is a configuration diagram of a fuel cell power generation system according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel cell, 9 ... Hot water discharge piping as main piping, 10 ... Hot water storage tank, 13 ... Air conditioner, 14 ... Outdoor unit, 16 ... Heat exchanger, 29 ... Branch piping, 34, 41 ... Valve Solenoid valve, 37: main pipe, 40: branch pipe.

Continuing from the front page (72) Inventor Keiji Onda 3-5-5 Kyoei-cho, Obu City, Aichi Prefecture F-term in the Tokai System Research Laboratories (Reference) 5H026 AA06 5H027 AA06 BA01 CC06 DD00 DD06 KK00 KK28 KK41 KK48 KK52 MM16 MM27

Claims (5)

[Claims] An air conditioner provided with a pipe for guiding a cooling medium heated by exhaust heat of a fuel cell power generation system to an outdoor unit of a heat pump type air conditioner at the time of defrosting a heat exchanger mounted on the outdoor unit. Outdoor unit defroster. 2. The pipe is branched from a main pipe for guiding a cooling medium used for cooling the fuel cell to a hot water tank, and the branch pipe is switched so that the cooling medium can flow from the main pipe to the branch pipe during the defrosting. The defroster for an outdoor unit of an air conditioner according to claim 1, further comprising a valve. 3. The cooling medium is water used for cooling a fuel cell and then stored in a hot water tank and used as hot water. The branch pipe is a heat exchanger provided in the outdoor unit. 3. The apparatus according to claim 2, wherein a cooling medium is applied to the cooling medium.
A defroster for an outdoor unit of the air conditioner according to Claim 1. 4. The main pipe forms a closed loop, and is formed so as to guide a heat exchanger that cools the fuel cell and raises the temperature of the fuel cell to a heat exchanger used as a heat source for hot water supply, and the branch pipe also forms a closed loop. The defroster for an outdoor unit of an air conditioner according to claim 2, wherein the defroster is provided. 5. The defrosting device is provided with a sensor for detecting that frost has adhered to the heat exchanger, and a flow rate of a cooling medium in the pipe is controlled based on a detection signal of the sensor. The defroster for an outdoor unit of the air conditioner according to any one of claims 1 to 4.