KR100455626B1 - Heat pump type hot water heating apparatus - Google Patents

Abstract

The present invention relates to a heat pump type hot water heater, which indirectly exchanges heat of the waste water with the waste heat heat exchanger to maintain a good performance of the waste heat heat exchanger, and at the same time, a scale deposited on the waste water heat radiating heat exchanger, It is designed to quickly clean the system without stopping operation and to increase the coefficient of performance even when the temperature of the waste water is low, and to prevent damage to the compressor.

The present invention comprises a basic circuit (1) connecting the compressor (2), the condenser (3), the first expansion valve (4), the waste heat evaporator (5) in order with conduits (6a-6c); An external heat evaporator (7) connected to the conduits (6b) and (6c) in a conduit (6d) (6e) with the second expansion valve (8) in parallel with the waste heat evaporator (5); A hot water heating closed circuit (9) provided with a hot water heat exchanger (10) and a water storage tank (11) which are heated by the heat of condensation of the condenser (3); A waste water heat absorption heat exchanger (14) connected to the waste heat evaporator (5) such that a closed circuit is formed to maintain a heat exchange relationship with the waste heat water heat dissipation heat exchanger (17); The bypass conduit 18 is connected to the outlet side of the waste heat evaporator 5 and the inlet side of the outside heat evaporator 7.

Description

Heat Pump Type Hot Water Heater {HEAT PUMP TYPE HOT WATER HEATING APPARATUS}

The present invention relates to a heat pump type hot water heater, and more particularly, to a heat pump type hot water heater that can selectively use waste heat and outside air as heat sources of an evaporator.

The heat pump cycle consists of a compressor, a condenser, an expansion valve, and an evaporator, and condenses the high-temperature / high-pressure refrigerant vapor compressed by the compressor in a condenser (used side heat exchanger), and uses the heat of condensation in hot water generation. The condensed high-temperature and high-pressure refrigerant liquid is expanded by an expansion valve, and then evaporated by endotherm in an evaporator (endothermic side heat exchanger), and the low-temperature and low-pressure refrigerant vapor evaporated by the evaporator is repeated in a cycle of being sucked into the compressor. .

As described above, when the high temperature and high pressure refrigerant liquid is evaporated by the endotherm in the evaporator, the groundwater or waste heat is used as the heat source or the outside air (atmospheric heat) is used, and when the ground water is used as the heat source, the refrigerant liquid is evaporated. In this case, when the outside air is used, if the outside air temperature is 5 ° C. or less, frost forms on the surface of the evaporator, which impedes heat transfer, and the grade coefficient is lowered.

On the other hand, a heat pump type hot water supply device using wastewater heat of a bath as a heat source is disclosed in 1989 Utility Model Application Publication No. 5439. The heat pump type hot water supply device uses a hot water heating circuit to a condenser of a heat pump system. At the same time it is formed by installing a low temperature tank in the hot water heating circuit, by connecting the waste water tank and waste water heat circulation means to the evaporator.

However, since the hot water supply device using the waste water heat of the bath does not generate waste hot water when there is no bather in the bath, the water in the waste bath is cooled and the evaporation of the refrigerant liquid in the evaporator is poor, resulting in a significant decrease in the heat coefficient of the heat pump. If the evaporator is poorly evaporated, the wet steam containing the refrigerant liquid is sucked into the compressor, causing liquid back to damage the valve of the compressor. Due to the resulting liquid hammer (liquid hammer) is the cause of such a liquid hammer is a problem that may cause damage to the compressor.

The inventors of the present invention, in order to rectify the above-mentioned problems, the basic circuit connecting the compressor, the condenser, the first expansion valve, the waste heat evaporator in order to the conduits (6a-6c), and the conduit (6b) (6c) 6d) (6e) is a heat consisting of a hot air heat evaporator connected to the waste heat evaporator in parallel with a second expansion valve, and a hot water heat closed circuit in which a hot water heat exchanger and a water tank are heated by condensation heat of the condenser. A pump type hot water heater was proposed in 2001 patent application No. 9095.

However, the above-mentioned source does not reduce the hot water heating efficiency by evaporating the refrigerant liquid in the external heat evaporator when the amount of generated waste water is low or when the outside temperature is 5 ° C. or higher, and thus the evaporation of the refrigerant liquid in the evaporator does not deteriorate. This is advantageous in that the compressor is not damaged, but since the hot water of the bath is directly introduced to the waste heat evaporator, the scale of the waste heat evaporator is accumulated in the waste heat evaporator, and the scale of the waste heat evaporator is deteriorated. In order to clean, it is necessary to remove the refrigerant conduit to stop the operation at the time of cleaning the scale, and the cleaning cost is high, and even when the amount of waste hot water is generated, when the temperature is low, Due to the low evaporation, the grade factor was found to be lowered.

The present invention is to correct the above problems, indirect heat exchange with the waste heat heat exchanger heat of the waste heat water to maintain the good performance of the waste heat heat exchanger and at the same time do not stop the operation of the heat pump cycle accumulated on the waste heat water heat exchanger It is an object of the present invention to provide a heat pump type hot water heating device capable of quickly cleaning and increasing the coefficient of performance even when the temperature of waste hot water is low and preventing damage to the compressor.

In order to achieve the above object, the present invention comprises a basic circuit connecting the compressor, the condenser, the first expansion valve, the waste heat evaporator in order to the conduit (6a ~ 6c); An outside air heat evaporator connected to the conduits 6b and 6c together with a second expansion valve in parallel with the waste heat evaporator through conduits 6d and 6e; A hot water heating closed circuit provided with a hot water heat exchanger and a water storage tank heated by the condensation heat of the condenser; A waste water heat absorption heat exchanger connected to the waste heat evaporator such that a closed circuit is formed to maintain a heat exchange relationship with the waste heat water heat exchanger; It consists of a bypass conduit connected to the outlet side of the waste heat evaporator and the inlet side of the outside heat evaporator.

1 is a block diagram of an embodiment of the present invention.

<Description of Signs of Major Parts of Drawings>

2: compressor 3: condenser 5: waste heat evaporator

7: outside heat evaporator 9: hot water heating closed circuit 10: hot water heat exchanger

11: reservoir tank 14: endothermic heat exchanger for waste hot water

17: waste heat water heat exchanger 18: bypass conduit

23 evaporation promoting means 24 heating heat exchanger 25 endothermic heat exchanger

28: heat exchange tank

1 is a configuration diagram of an embodiment of the present invention, 1 is a basic circuit, the basic circuit (1) is a compressor (2), condenser (3), the first expansion valve (4), waste hot water of the bath, industrial equipment Waste heat evaporator (5) and the compressor (2) for evaporating the refrigerant liquid by a heat source such as hot water of the conduit (6a ~ 6c) in order to connect.

7 is an outside heat evaporator, and the outside air evaporator 7 is installed in parallel with the waste heat evaporator 5 through conduits 6d and 6e in the conduits 6b and 6c, and the conduit 6d. The second expansion valve (8) is provided.

9 is a hot water heating closed circuit, wherein the hot water heating closed circuit 9 connects the hot water heat exchanger 10 and the water storage tank 11 to the circulation conduits 12a and 12b to form a closed circuit and at the same time the circulation conduit 12b. The hot water heat exchanger 10 is installed on the side or the outside of the condenser 3 by installing a pump 13 in the condenser 3 for heating the hot water heat exchanger 10 by the condensation heat of the refrigerant vapor flowing through the condenser 3. As the hot water is heated, the refrigerant vapor condenses to form a refrigerant liquid.

14 is a wastewater endothermic heat exchanger, the wastewater endothermic heat exchanger (14) is a circulating conduit (15) having a pump (16) installed at an inlet (5 ') and an outlet (5 ") of the waste heat evaporator (5). While the closed circuit is connected to the inside and vacuum heat is charged inside the distilled water, ethylene glycol, etc., the waste hot water endothermic heat exchanger (14) is provided with a separate waste hot water heat dissipation heat exchanger (17) Waste heat by supplying the waste hot water to the waste heat water heat dissipation heat exchanger 17 by heating the heat medium flowing through the waste heat water endothermic heat exchanger 14 by circulating the waste heat evaporator 5 by holding heat of the waste water. The refrigerant liquid flowing through the evaporator 5 is to be evaporated.

18 is a bypass conduit, wherein the bypass conduit 18 is connected to the outlet side of the waste heat evaporator 5 and the inlet side of the external heat evaporator 7 (rear side of the second expansion valve 8). And a solenoid valve (19) (19 ') behind the inlet side of the bypass conduit (18) and the branch of the bypass conduit (18) of the conduit (6c) to provide a compressor (2) for the conduit (6c). The solenoid valve 19 is opened and the solenoid valve 19 'is closed at a temperature below a predetermined temperature by a temperature sensor (not shown) installed at the suction part of

Then, the solenoid valves 20 and 20 'are installed at the inlet side of the expansion valves 4 and 8 of the conduits 6b and 6d so that the waste water is installed at the inlet or the outlet of the waste heat dissipation heat exchanger 17. The output signal of the sensor (not shown) for detecting the flow is input to the controller (not shown) and selectively opened and closed by the output signal of the controller, and the pump 16 is also driven when the solenoid valve 20 is opened. It is.

In addition, a water supply pipe 21 is connected to the circulation conduit 12b, and a solenoid valve 22 is installed on the water supply pipe 21 to output a signal of a water level switch (not shown) installed in the water storage tank 11 to the controller. It is to be opened and closed by input by the output signal of the controller.

In the present invention, the evaporation promoting means 23 is installed in the outdoor heat evaporator 7, and the evaporation promoting means 23 is provided with a heat exchanger 24 and an endothermic heat exchanger 25 with a pump 21. After forming a closed circuit with a circulation conduit 26 to vacuum-fill the heating medium, the heating heat exchanger 24 is integrally formed or separately placed in the external heat evaporator 7, and the endothermic heat exchanger 25 is a circulation conduit ( 12b) is formed by forming a heat exchange tank 28, the pump 27 is installed a sensor (not shown) in the heat exchange tank 28 so that the temperature of the hot water for heating is set temperature (for example R-22 as a refrigerant) If used, it is to be driven by the output signal at more than 40 ℃).

Reference numeral 29 is a hot water tap and 30 is a check valve.

According to the present invention as described above, when the waste water is introduced into the waste heat water heat exchanger 17 after the water supply of the predetermined temperature in the water storage tank 11, the pump 16 is driven and the solenoid valve 20 is opened. And the solenoid valve 20 'is kept in a closed state. When the compressor 2 is driven in the above state, the hot and high pressure refrigerant vapor compressed by the compressor 2 flows into the condenser 3 to exchange heat with hot water. Heat condensation is cooled and condensed by hot water for heating flowing through the vessel 10 and expanded in the first expansion valve 4 via the conduit 6b and then heated in the waste heat water endothermic heat exchanger 14 in the waste heat evaporator 5. This cycle repeats the cycle of evaporating into the low-temperature / low-pressure refrigerant vapor and being sucked into the compressor 2.

As described above, when the waste liquid is evaporated from the waste heat evaporator 5 by the waste heat of the waste water, the inflow of waste water supplied to the waste heat water heat dissipation heat exchanger 17 decreases or stops. As the output signal of the sensor installed in the) is stopped, the driving of the pump 16 is stopped, the solenoid valve 20 is closed, and the function of the waste heat evaporator 5 is stopped, and the solenoid valve 20 'is opened. The refrigerant liquid of high temperature and high pressure condensed in (3) is expanded by the second expansion valve (8) via the conduit (6d), and then is evaporated by the outside air heat in the external air evaporator (7) and sucked into the compressor (2). By repeating the cycle, it is possible to always perform the heating of the hot water.

On the other hand, when the coolant liquid is evaporated in the waste heat heat exchanger 5 or the outdoor heat evaporator 7, and the heat pump cycle is repeated, the hot water for heating of the water storage tank 11 is a circulation conduit 12b and the heat exchange tank 28. ) Is heated while circulating the hot water heat exchanger 10 by heat dissipation of the condensation heat of the condenser 3 while circulating the hot water heat exchanger 10, the circulation conduit 12a, and the water storage tank 11. At high temperature and high pressure, the refrigerant vapor condenses.

In addition, when the temperature of the waste hot water is low when evaporating the refrigerant liquid in the waste heat evaporator (5) as described above, evaporation of the refrigerant liquid in the waste heat evaporator (5) is low, and the wet steam containing the refrigerant liquid is sucked into the compressor (2). In this case, the temperature of the wet steam is low. In this case, the temperature sensor installed in the suction part of the compressor 2 of the conduit 6c detects the temperature, and the solenoid valve 19 'is closed by the output signal. The valve 19 is opened so that the refrigerant liquid, which has not evaporated in the waste heat evaporator 5, is re-evaporated in the outside heat evaporator 7 via the bypass conduit 18 to be dried or superheated and vaporized. The coefficient of performance is increased, and the occurrence of liquid droplets due to liquid back and liquid compression in the compressor 2 is prevented.

As described above, according to the present invention, the heat of the waste water is radiated from the waste heat water heat dissipation heat exchanger (17) to the waste heat water endothermic heat exchanger (14) to heat the heat medium, and the heated heat medium dissipates the refrigerant liquid in the waste heat evaporator (5). By employing the indirect heating method of evaporation, the scale contained in the waste hot water is deposited only in the waste water heat radiating heat exchanger (17), so that the scaled waste waste water heat radiating heat exchanger (17) is deposited at the time of operation of the outside heat evaporator (7). It can be removed and cleaned for continuous operation of the heat pump cycle, making cleaning simple and quick.

In addition, the present invention is the temperature of the hot water for heating is lowered by the endotherm (heat radiation of the hot water for heating) of the endothermic heat exchanger 25 built in the heat exchange tank 28 when the hot water for heating passes through the heat exchange tank 28 and At the same time, if the temperature of the hot water for heating is higher than the set temperature after heating the heat medium filled in the evaporation promoting means 23, the pump 27 is driven to radiate heat from the heat exchanger 24 to the outside heat evaporator 7 The evaporation of the refrigerant liquid in the thermal evaporator 7 is promoted or promoted.

As described above, when the temperature of the hot water for heating is lowered in the heat exchange tank 28 and then heated in the hot water heat exchanger 10, the temperature difference between the refrigerant vapor and the hot water for heating can be increased in the condenser 3. At high temperature and high pressure, the condensation of the refrigerant vapor becomes good, and the heat radiation from the heating heat exchanger 24 to the external air evaporator 7 results in better evaporation of the refrigerant liquid in the season of high outside air temperature and the outside air temperature of 5 ° C. or less. In this case, since the frost does not form in the outside heat exchanger 7 or the defrosted frost is defrosted, the refrigerant liquid is evaporated and the refrigerant vapor sucked into the compressor 2 is dried or superheated steam, resulting in a heat coefficient of the heat pump cycle. Is further increased. In addition, when the saturation or superheated steam is sucked into the compressor, the occurrence of a liquid drop due to liquid back and liquid compression in the compressor 2 is further prevented.

As described above, the present invention can maintain the performance of the waste heat heat exchanger indirectly by indirectly exchanging heat of the waste water with the waste heat heat exchanger, while continuously operating the scale accumulated in the waste heat water heat exchanger without interrupting the operation of the heat pump cycle. Easy and quick cleaning, and by installing the outdoor heat evaporator in the basic circuit where the waste heat evaporator is installed, it is possible to generate hot water at all times even if the waste heat is small or no, and the waste heat evaporator when the hot water of waste hot water is low. When the evaporation of the coolant liquid is low, the refrigerant liquid is evaporated again in the external heat evaporator via the bypass conduit to improve the evaporation. Therefore, it is possible to increase the coefficient of performance and to prevent the occurrence of liquid back and liquid drop in the compressor. It is.

In addition, the present invention maintains the coefficient of performance even better and prevents damage to the compressor because it is possible to install the evaporation promoting means in the outdoor heat exchanger to promote evaporation of the refrigerant liquid in the external heat exchanger even when the outside air temperature is low, thereby making it dry or superheated and vaporized. You can do it.

Claims (2)

A main circuit in which a compressor, a condenser, a first expansion valve, and a waste heat evaporator are sequentially connected to conduits 6a to 6c; An outside air heat evaporator connected to the conduits 6b and 6c together with a second expansion valve in parallel with the waste heat evaporator through conduits 6d and 6e; A hot water heating closed circuit heated by the condensation heat of the condenser and provided with a hot water heat exchanger and a water storage tank; A waste water heat absorption heat exchanger connected to the waste heat evaporator such that a closed circuit is formed to maintain a heat exchange relationship with the waste heat water heat exchanger; Heat pump type hot water heater comprising a bypass conduit connected to the outlet side of the waste heat evaporator and the inlet side of the outside heat evaporator. The heat pump type hot water heating device according to claim 1, wherein a heat exchanger tank is formed in the hot water heating closed circuit, and an endothermic heat exchanger built in the heat exchanger tank is installed on one side and an evaporation promoting means composed of a heating heat exchanger attached to the outside air evaporator on the other side. Device.