KR100867648B1 - Waste heat withdrawal system of heat pump air-conditioner - Google Patents

Abstract

A waste heat recovery system of a heat pump type air conditioner is provided to reduce accumulating of drop generated in the outdoor heat exchanging unit, to improve efficiency of the heat pump type air conditioner by using the waste heat generated from the separate auxiliary heating apparatus which is equipped in order to supplement the cooling ability of air-conditioner. A waste heat recovery system of a heat pump type air conditioner comprises as the follows. An indoor heat exchanger(140) is connected to a compressor(110) with a refrigerant pipe. An expansion valve(130) is connected to the refrigerant pipe coming out from the indoor heat exchanger. An outdoor heat exchanger(120) is connected to the refrigerant pipe passing the expansion valve. A heat pump type heating system consists of an auxiliary heating boiler(212) for the auxiliary heating of indoor. An exhaust gas pipe(216) of the auxiliary heating boiler passes through the space in which the air of indoor and outdoor is passed.

Description

Heat pump type air conditioner waste heat recovery system {Waste heat withdrawal system of heat pump air-conditioner}

1-conventional heat pump type air conditioner system

2-waste heat recovery system of a heat pump type air conditioner according to the present invention

3-waste heat recovery system of the cooling operation according to the present invention

4-waste heat recovery system of heating operation according to the present invention

5-perspective view of an embodiment to which the present invention is applied

<Description of Major Drawing Codes>

110: compressor 120: outdoor side heat exchanger

130: expansion valve 140: indoor side heat exchanger

150: liquid separator 160: 4-way valve

210: auxiliary heating boiler 212: auxiliary heating boiler

214: Indoor auxiliary heating hot water pipe

216: exhaust gas pipe 218: liquid separator supply hot water pipe

220: indoor heat exhaust pipe

The present invention relates to a heat pump type air conditioner capable of performing both indoor cooling and heating and ventilation, and more particularly, to a technology for recovering and utilizing waste heat from surroundings when operating in a heating cycle.

Conventional heat pump type air conditioner, as shown in FIG. 1, compressor 110, outdoor side heat exchanger 120, expansion valve 130, indoor side heat exchanger 140, liquid separator 150 And a four-way valve 160, and the cooling and heating cycles can be selectively operated by switching the flow direction of the refrigerant.

First, a heat pump type air conditioner operated by a heating cycle will be described with reference to FIG. 1.

The compressor 110 compresses a gas refrigerant having a low temperature and a low pressure to a high pressure, at which time the refrigerant absorbs heat generated from the compressor and becomes a high temperature.

The high temperature and high pressure gaseous refrigerant is discharged from the compressor 110 and sent to the indoor heat exchanger 140.

Since the indoor heat exchanger 140 serves as a condenser when the heat pump type air conditioner is operated in a heating cycle, the high temperature and high pressure gas refrigerant introduced into the indoor heat exchanger 140 discharges heat to become liquid. It is sent to the expansion valve (130).

The expansion valve 130 is a device for expanding the refrigerant. When the refrigerant passing through the condenser passes through the expansion valve 130, the expansion valve 130 is changed into a liquid having a low temperature and low pressure, and then flows into the outdoor heat exchanger 120.

Since the outdoor heat exchanger 120 acts as an evaporator when operating in a heating cycle, the low temperature and low pressure liquid introduced from the expansion valve 130 is converted into a gas by absorbing external heat therein.

In this way, when the refrigerant having the low temperature and low pressure gas returns to the compressor through the liquid separator 150 in the outdoor heat exchanger 120, one cycle is completed.

Meanwhile, in order to operate the heat pump type air conditioner in a cooling cycle, the flow direction of the refrigerant may be switched to be opposite to the heating cycle using the four-way valve 160.

The role of the compressor 110, the expansion valve 130 and the like in the cooling cycle is the same as in the heating cycle. However, in the cooling cycle, the indoor heat exchanger 140 serving as the condenser in the heating cycle and the outdoor heat exchanger 120 serving as the evaporator are replaced with the evaporator and the condenser, respectively.

Meanwhile, the liquid separator 150 shown in FIG. 1 of the prior art has an evaporator and a compressor 110 to filter the liquid when the refrigerant that passes through the evaporator does not completely evaporate in a cooling and heating cycle. The device is located between.

And the four-way valve 160 is a device for switching the refrigerant flow direction to match each cycle during the cooling or heating operation.

However, these heat pump type air conditioners have the following problems.

That is, when the heat pump type air conditioner having the same configuration as that of the related art is applied to the heating operation, when the external temperature reaches 0 ° C. to about 6 ° C., the drop of the heat is applied to the surface of the outdoor heat exchanger 120 operating as the evaporator. In some cases, the outside of the outdoor heat exchanger 120 may be thickly filled with ice, so that heat exchange with air in the air may not be performed smoothly.

In addition, heat pump type air conditioners are practically difficult to use when the outdoor temperature falls below -5 ° C in winter.

Because heat pump type air conditioner basically absorbs heat from outside air with refrigerant and transports it to the room, it is heated. Therefore, the lower the outside temperature, the lower the heating capacity. When the temperature is below -5 ℃, it actually absorbs heat from outside air. This is because it is extremely difficult to do so, excessive drop occurs in the outdoor heat exchanger (evaporator), poor refrigerant circulation action, excessive refrigerant lubrication action, and the efficiency of the compressor is greatly reduced.

Accordingly, the conventional method of defrosting by using heat generated by operating the circuit of the heat pump to reverse the heat pump to operate the condenser in order to solve the above-mentioned problem, or the high-temperature, high-pressure refrigerant gas from the compressor to the indoor side A method of bypassing the heat exchanger (condenser) to the outdoor heat exchanger (evaporator) and defrosting the refrigerant gas with heat is used.

However, the method of operating the circuit of the heat pump in reverse or bypassing the refrigerant gas of high temperature and high pressure has a problem of degrading the performance of the heat pump air conditioner as a whole. In other words, if the defrost cycle is frequent, the energy consumed for this increases, which lowers the coefficient of performance of the heat pump.

Accordingly, a method of reducing the buildup by providing heat by installing a separate defrosting heat source device such as an electric heater, a gas heater or a steam radiator on the outdoor heat exchanger side, in which case the facility cost increases and the defrost energy cost increases. As it is consumed additionally, it is economical.

In addition, in order to solve the problem of insufficient heating capacity of the heat pump air conditioner due to the decrease in the outside temperature, as shown in Korean Utility Model Registration No. 0385407, a separate auxiliary heat source such as a boiler or a water heater is installed to air-condition insufficient heat. It has been used to supply the inside of the indoor unit of the unit, or to use the heat pump air conditioner itself as an auxiliary heating device, and the separate heating facilities such as boilers have been used as the main heating device.

However, the conventional technique of using a separate heat source device for heating has solved the problem of lack of heating ability, but the exhaust heat generated from the separate heat source device is discharged into the air as it is for the efficiency of energy utilization. There was no consideration.

On the other hand, the compressor 110 used in a conventional heat pump type air conditioner is designed to compress a refrigerant in a gaseous state. If the liquid refrigerant flows into the compressor 110, a shock load is generated in the compressor due to the liquid that is not compressed well, thereby causing a failure of the compressor.

Accordingly, the liquid separator 150 is provided to separate the liquid component from the refrigerant entering the compressor.

However, if the liquid refrigerant that has not evaporated in the liquid separator 150 continues to accumulate and is out of the liquid refrigerant storage limit of the liquid separator 150, the liquid refrigerant flows into the compressor 110, which may cause the same problem. have.

The present invention is to solve the above problems,

In the case of heating operation of heat pump type air conditioner, using the heat and waste heat generated from a separate auxiliary heating device provided to supplement the cooling capacity of the air conditioner, it is possible to reduce the buildup generated in the outdoor heat exchanger, By inducing the evaporation of the liquid refrigerant in the inside, it is an object to provide a technical means to increase the efficiency of the heat pump type air conditioner.

Another object of the present invention is to provide a technical means for recovering the waste heat generated in the kitchen or other indoors of the building to reduce the build-up generated in the outdoor heat exchanger (evaporator), to increase the efficiency.

Still another object of the present invention is to provide a structure for providing a space for storing a separate device by utilizing a space of an indoor heat exchange chamber of a heat pump type air conditioner.

Heat pump type air conditioner waste heat recovery system according to the present invention for achieving the above object is a conventional heat pump type air conditioner (hereinafter referred to as 'heat pump type air conditioner') Denotes an “air conditioner.”) The compressor 110, the outdoor heat exchanger 120 connected to the compressor 110, the expansion valve 130 connected to the outdoor heat exchanger, and the indoor The side heat exchanger (140), the liquid separator (150) and the four-way valve (160) has a configuration further comprising an auxiliary heating boiler unit (210), an indoor heating apparatus exhaust pipe (220), and a hot water heating unit (230).

Hereinafter, except for a portion overlapping with the above-described conventional air conditioner, the configuration of the present invention will be described in detail based on the configuration constituting the features of the present invention.

2, the auxiliary heating boiler 210 of the present invention is the auxiliary heating boiler 212, indoor auxiliary heating hot water pipe 214, exhaust gas pipe 216, liquid separator supply hot water pipe 218 ) And a liquid separator heat exchanger (219).

Auxiliary heating boiler 212 is a device used to compensate for the lack of heating capacity when the air conditioner is heating operation is located in a separate space inside or outside the air conditioner.

One side of the auxiliary heating boiler 212 is connected to the indoor auxiliary heating hot water pipe 214 to which the warm water heated by the auxiliary heating boiler 212 is moved. The indoor auxiliary heating hot water pipe 214 is connected to the auxiliary heating coil 215 in the room again. Therefore, the hot water heated in the auxiliary heating boiler 212 circulates the auxiliary heating coil 215 of the room along the indoor auxiliary heating hot water pipe 214.

In addition, one side of the auxiliary heating boiler (212) is connected to the exhaust gas pipe 216 for extracting the exhaust gas generated during the operation of the auxiliary heating boiler (212), the exhaust gas pipe 216 is the outside of the indoor and outdoor air Before passing through the heat exchanger 120 is passed through the flow space is drawn out.

On the other hand, one side of the auxiliary heating boiler 212 is connected to the liquid separator supply hot water pipe 218 for drawing out a part of the hot water heated by the auxiliary heating boiler (212). The liquid separator supplying hot water pipe 218 extending from the auxiliary heating boiler 212 is connected to the liquid separator heat exchanger 219 and is returned to the auxiliary heating boiler 212 again.

The indoor auxiliary heating hot water pipe 214 and the liquid separator supply hot water pipe 218 are provided with stop valves 310 and 320 for blocking the flow of hot water, respectively.

The indoor heat exhaust pipe 220 is a device for moving the heat generated in the room to the outdoor heat exchanger 120 when the air conditioner performs the heating operation.

The indoor heat exhaust pipe 220 is attached to an upper portion of a cooking facility such as a gas stove located in the room, and is connected to a discharge portion of exhaust heat generated indoors, such as a hood for sucking smell or smoke.

The indoor heat exhaust pipe 220 is configured to pass through a space that flows before the indoor and outdoor air passes through the outdoor side heat exchanger 120, and to exchange heat with the ambient air of the outdoor side heat exchanger 120 and to exit to the outside. do.

In addition, when the bypass pipe 222 is provided in the indoor heat exhaust pipe 220 and does not need to provide heat to the outdoor heat exchanger 120, such as when the cooling operation is performed, the exhaust pipe 220 immediately exits to the outside. This heat flow can be controlled by providing the stop valves 330 and 340 to the indoor heat pipes 220 and the bypass pipes 222.

Next, the hot water heating unit 230 will be described.

Referring to FIG. 4, the hot water heater 230 is a device used when the air conditioner performs the cooling operation, and the hot water heat exchanger 232, the water supply pump 234, and the hot water boiler 236. consist of.

The hot water heat exchanger 232 is located in the refrigerant passage tube where the refrigerant discharged by the compressor 110 goes to the outdoor heat exchanger 120.

The inlet 232a and the outlet 232b of the water supply pipe are formed at both ends of the hot water heat exchanger 232 to allow water to enter or exit the hot water heat exchanger 232.

The outlet 232b of the water supply pipe 232 of the hot water heat exchanger 232 is connected to the water supply pump 234, and the water from the outlet 232b is moved to the hot water supply boiler 236 by the water supply pump 234.

The inlet 232a and the outlet 232b of the water supply pipe formed in the hot water heat exchanger 232 do not pass the hot water heat exchanger 232, but the bypass pipe so as to turn the flow of the fluid directly to the water supply pump 234. 238 is formed.

And the inlet 232a, outlet 232b and bypass pipe 238 of the water supply pipe formed in the hot water heat exchanger 232, stop valves 350, 360, 370 that can control the flow of the fluid Are located respectively.

On the other hand, the auxiliary heating boiler and the hot water boiler used in the present invention has been described based on the use of hot water boiler, it is clear that it is obvious to those skilled in the art to replace this with a steam boiler. In addition, it is obvious that the heat medium used in the hot water boiler is not limited to water, but antifreeze may be used for winter protection.

In addition, an expansion valve 130 is provided in a pipe in which refrigerant flows between the indoor heat exchanger 140 and the outdoor heat exchanger 120, and the expansion valve 130 is a cooling expansion valve 132 for cooling and heating. Divided into expansion valves 134, there are several non-return valves 402a, 402b, 404a, and 404b that can control the flow of the refrigerant to suit cooling or heating.

An embodiment of the present invention having such a configuration will be described with reference to FIG. 5. However, in the present embodiment, since the emphasis is placed on the heating operation, the configuration for the hot water heater described above is excluded.

In this embodiment, the indoor heat exchanger chamber 600 and the heat exchanger chamber 600 provided with an indoor heat exchanger 140 and an air supply blower 660 on one side, and an outdoor heat exchanger on the other side, centered on the central partition 550 installed in the central part in a single case. The outdoor heat exchange chamber 700 provided with the gas 120, the exhaust blower 760, and the like is configured.

In this embodiment, four dampers are provided for supplying indoor air and outdoor air into the air conditioner.

The indoor air circulated from the inside is introduced into the indoor air mixing chamber 650 and the outdoor air mixing chamber 750 through the indoor air supply damper 610 and the indoor air exhaust damper 710, respectively. Outdoor air supplied from the outside is also introduced into the indoor air mixing chamber 650 and the outdoor air mixing chamber 750 through the outdoor air supply damper 620 and the outdoor air exhaust damper 720, respectively.

 Therefore, if 30% of the indoor air is to be ventilated, only 70% of the indoor air that has been circulated is introduced into the indoor air mixing chamber 650 through the indoor air air damper 610, and the outdoor air is the outdoor air air damper 620. Through each of the damper opening amount is adjusted so that the 30% lacking in the indoor air mixing chamber 650 through.

The indoor heat exchange chamber 600 serves to supply air by mixing indoor air and outdoor air, and respectively, indoor air supply dampers 610 based on the central partition 550 of the air conditioner. ) And the outdoor air supply damper 620 is located.

In addition, an indoor heat exchanger 140 is installed in the indoor heat exchange chamber 600, and an air purifying filter 630 for cleaning air sent to the indoor side in close proximity to both surfaces of the indoor heat exchanger 140 as necessary. And reheater 640 for humidity control during cooling operation can be installed.

The space surrounded by the central partition 550, the indoor air supply damper 610, the outdoor air supply damper 620, and the indoor side heat exchanger 140 among the indoor side heat exchange chamber 600 is an indoor side air mixing chamber 650. ), Where indoor air and outdoor air are mixed.

An air supply blower 660 is located at an opposite side of the indoor air mixing chamber 650 around the indoor heat exchanger 140, and the air supply air supply Air is an air passage that allows air to be moved into the room. Duct 670 is provided.

The air supply blower 660 provides a pressure necessary for sending indoor air and outdoor air mixed at a predetermined ratio in the indoor air mixing chamber 650 to the room through the air supply duct 670.

In addition, the outdoor heat exchange chamber 700 serves to discharge indoor air after passing through the outdoor heat exchanger 120 by mixing indoor air and outdoor air, based on the central partition 550 of the air conditioner. The indoor air exhaust damper 710 and the outdoor air exhaust damper 720 are positioned at both sides.

In addition, since the outdoor heat exchanger 120 is installed in the outdoor heat exchange chamber 700, the central partition 550, the indoor air exhaust damper 710, the outdoor air exhaust damper 720 among the outdoor heat exchange chamber 700, and The space surrounded by the outdoor side heat exchanger 120 becomes the outdoor side air mixing chamber 750.

An exhaust blower 760 is positioned at an opposite side of the outdoor air mixing chamber 750 around the outdoor heat exchanger 120, and an exhaust duct 770, which is an air passage for discharging air to the outside, is disposed in the exhaust air blower 760. ) Is provided.

Meanwhile, in the present embodiment, the auxiliary heating boiler room 100 is configured by separately dividing a part of the space of the indoor heat exchange chamber 600.

That is, the heat pump type air conditioner has a coil heat transfer area of the indoor heat exchanger smaller than the coil heat transfer area of the outdoor heat exchanger, and the air blower 660 installed in the indoor heat exchange chamber 600 includes an outdoor heat exchange chamber 700. By using a smaller than the exhaust blower 760 installed in the), by adjusting the position of the devices installed inside the indoor heat exchange chamber 600 to provide an extra idle space, the present invention uses this space to assist The heating boiler room 100 is comprised.

The auxiliary heating boiler room 100 is basically a space in which the auxiliary heating boiler 212 is installed, but may further accommodate devices such as the liquid separator 150 or the compressor 110 according to a situation.

One side of the auxiliary heating boiler 212 is connected to the indoor auxiliary heating hot water pipe 214, exhaust gas pipe 216, the liquid separator supply hot water pipe 218.

The exhaust gas pipe 216 is formed so as to pass through the inside air mixing chamber 750 once or several times so that the area for heat exchange with air is widened.

The liquid separator supplying hot water pipe surrounds the surface of the liquid separator and provides heat to the liquid separator to transfer heat to the refrigerant filtered as a liquid staying inside the liquid separator to convert the gas into a gas.

If there is no liquid in the liquid separator and only gas, the gas is heated and enters the compressor at a high pressure. Thus, the compressor can pressurize the gas refrigerant to a higher pressure. As a result, the temperature of the gas refrigerant discharged from the compressor is increased. As it increases, the heating efficiency is further increased.

In addition, in the present embodiment, the indoor heat equipment pipe 220 connected to the cooking hood (not shown) on the indoor side passes through the outdoor air mixing chamber 750, and the same as the exhaust gas pipe 216. The inside of the outdoor air mixing chamber 750 is formed so as to whirl through once or several times, so that the air and heat exchange area is widened.

The operation and effects of the embodiment according to the present invention will be described with reference to heating operation.

Indoor air and outdoor air enter the air conditioner through the indoor air air damper 610, the indoor air exhaust damper 710, the outdoor air air damper 620, and the outdoor air exhaust damper 720, respectively.

However, the indoor and outdoor air supply dampers 610 and 620 located between the central partition 550 in the air conditioner and the indoor and outdoor air exhaust dampers 710 and 720 respectively adjust the amount of damper opening. The indoor and outdoor air introduced therefrom are separated into a predetermined ratio and divided into the respective spaces of the indoor heat exchange chamber 600 and the outdoor heat exchange chamber 700.

The indoor and outdoor air introduced through the indoor air supply damper 610 and the outdoor air supply damper 620 are mixed at a predetermined ratio in the indoor air mixing chamber 650 to achieve a ventilation action.

The indoor and outdoor air mixed in the indoor air mixing chamber 650 is filtered through the air purifying filter 630, and the dust is filtered out by heat exchange with the refrigerant while passing through the indoor heat exchanger 140. It becomes hot air, and is sent to the room via the air supply duct 670 by the air supply blower 660.

On the other hand, the indoor and outdoor air introduced through the indoor air exhaust damper 710 and the outdoor air exhaust damper 720 are mixed at a predetermined ratio in the outdoor side air mixing chamber 750, and thus the mixed air has a higher temperature than the outside air. When passing through the outdoor heat exchanger 120, the refrigerant is able to absorb more heat more efficiently, and eventually, the effect of recovering the waste heat of the indoor air exhausted to the outside is obtained. The air passing through the outdoor heat exchanger 120 and heat exchanged with the refrigerant is discarded to the outside through the exhaust duct 770 by the exhaust blower 760.

Meanwhile, when the auxiliary heating boiler 212 is operated, the exhaust gas pipe 216 passes through the outdoor side air mixing chamber 750, and likewise, the indoor heat device pipe 220 through which the air warmed by the heat generated indoors flows is also outdoors. Since it passes through the side air mixing chamber 750, as described above, it is possible to absorb waste heat of the exhaust gas in addition to the indoor and outdoor air mixed in a predetermined ratio in the outdoor side air mixing chamber 750, thereby improving the efficiency of the air conditioner. Will rise.

First, the outdoor side by using the heat contained in the exhaust gas generated from the auxiliary heating boiler 212 installed due to the lack of heating capacity during the heating operation of the heat pump type air conditioner and the heat generated from the indoor cooking facilities, etc. Since the temperature inside the heat exchanger is increased, the rate of dropping in the outdoor heat exchanger 120 is reduced and the heating capacity is increased without additional energy consumption.

Second, in the cooling or heating operation, the liquid refrigerant introduced into the liquid separator 150 in a liquid state without being evaporated properly in the evaporator is not supplied to a liquid separator supply hot water pipe 218 connected to the auxiliary heating boiler 212 without a separate heat source. By heating the liquid separator 150 by evaporating the liquid refrigerant, not only the liquid refrigerant may be prevented from flowing into the compressor 110 but also the temperature and pressure of the gas refrigerant discharged from the compressor may be increased. 110) Stable operation and failure prevention can be achieved, and the thermal efficiency of the air conditioner can be increased.

Third, by absorbing the heat of the refrigerant passing through the compressor 110 in the hot water heating unit 230 during the cooling operation, it is possible to provide hot water at the same temperature with less heat than when the hot water is heated in the hot water boiler 216. It has an effect.

Fourth, in the heat pump type air conditioner, by utilizing the idle space of the indoor heat exchange chamber, which has more space than the outdoor heat exchange chamber, as the device storage space, the space occupied by the device can be saved and the convenience of maintenance can be achieved. Can be.

Claims (4)

An indoor heat exchanger connected to the compressor and the refrigerant pipe; An expansion valve connected to the refrigerant pipe from the indoor heat exchanger; An outdoor heat exchanger connected to a refrigerant pipe passing through the expansion valve; In the heat pump type heating system comprising an auxiliary heating boiler for auxiliary heating in the room, The exhaust gas pipe 216 of the auxiliary heating boiler is heat pump type air conditioner waste heat recovery, characterized in that configured to be drawn to the outside through the space flowing before the air outside the room passes through the outdoor heat exchanger (120) system. delete delete The method of claim 1, The auxiliary heating boiler is a heat pump type air conditioner waste heat recovery system, characterized in that installed in the auxiliary heating boiler chamber formed by separately dividing a part of the space of the heat exchange chamber of the indoor side of the heat pump type air conditioner.

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