CN201306813Y - Household air conditioner total heat recovery water heater - Google Patents

Abstract

The utility model relates to a household air conditioner full heat recovery water heater, which is refitted on an outdoor unit of an ordinary household split air conditioner. The first-stage heat exchanger is an immersion heat exchanger connected to the output end of the compressor of the domestic air-conditioning system, and the second-stage heat exchanger is a sleeve-type counterflow heat exchanger. The heater is connected, the outlet of the inner pipe is connected with the input end of the condenser of the household air conditioning system, one end of the annulus of the outer casing is connected with the tap water inlet, and the other end is provided with a temperature-controlled flow regulating water valve. The utility model realizes the full heat recovery of the air-conditioning system through the two-stage heat exchanger, realizes 100% utilization of the waste heat of the air-conditioning, and solves the technical problem of low utilization rate of heat energy of other air-conditioning waste heat water heaters, and the water storage insulation box discharges hot water And refilling with tap water will not significantly lower the outlet water temperature.

Description

Household air conditioner full heat recovery water heater

technical field

The utility model relates to the technical field of HVAC engineering, in particular to a water heater which utilizes the waste heat of an air conditioner to heat water.

Background technique

With the increasing tension of international energy sources and the deteriorating global warming effect, the country puts forward deeper requirements for energy conservation and consumption reduction, and the awareness of energy conservation among Chinese people is also further strengthened. Product development for comprehensive energy utilization is urgent. With the development and progress of society, air conditioners have basically entered every family. If the waste heat generated by air conditioners is used to heat water for human living, it can avoid the consumption of gas and other energy by hot water and improve the global greenhouse. effect also has a certain contribution.

Analysis of air-conditioning waste heat utilization technology: In the air-conditioning refrigeration system, when the compressor compresses the refrigerant that has been evaporated into a gaseous state through the evaporator located in the indoor unit into a high-temperature and high-pressure gaseous refrigerant, and sends it to the condenser located in the outdoor unit for heat dissipation Finally, the gaseous refrigerant turns into a liquid refrigerant at room temperature and high pressure, and this part of the heat is blown out by the fan and lost to the air, which is a kind of pollution to the environment and a waste of energy.

In recent years, an air-source heat pump water heater and an air-conditioning waste heat utilization hot water device have appeared on the market. The traditional air-source heat pump water heater can only be used as a single-purpose water heater, and an air-source heat pump unit needs to be invested; while the traditional air-conditioning waste heat utilization The water heater is equipped with a single submerged heat exchanger in the water storage insulation box. The temperature of the refrigerant coming out of the compressor is about 60-70°C. When the water temperature in the water storage insulation box reaches above 50°C, the efficiency of the exchanger is very high. Poor, when the water storage incubator discharges hot water and refills tap water at 15-25°C, the water temperature in the water storage incubator will drop. When the water temperature is lower than 45°C, it is not suitable for bathing water, so this kind of The recovery heat utilization rate of air-conditioning waste heat water heater is quite low. After testing and calculation, less than 20% of heat can be recovered for heating water, and the remaining 80% of heat is still discharged into the atmosphere, causing energy waste and pollution. Although there is a lot of waste heat released by ordinary air conditioners outdoors, the temperature is quite low, which is a low-level energy. In particular, the exhaust temperature of household air conditioner compressors is 60-70°C, while the temperature of domestic hot water needs to be about 55°C, which is only 5-15°C The temperature difference is available, so the utilization rate is not high. There is also a circulating water pump on the market to drive the countercurrent casing circulation heat exchanger. The initial heat exchange efficiency is high. When the water temperature in the water storage insulation box is close to 55°C, the heat exchange effect is still not ideal, and the hot water needs another circulation. The water pump increases energy consumption and also increases the chance of failure; in addition, there is another method on the market that increases the discharge temperature and pressure of the compressor to increase the amount of heat recovery, but due to the increase in the condensation temperature, the refrigerator The cooling effect ratio has been reduced.

Utility model content

The first purpose of this utility model is to provide a household air conditioner full heat recovery water heater, which can be retrofitted with existing household split air conditioners in ordinary households. The discharged low-level heat energy is all absorbed for heating domestic water, and when the water storage incubator releases hot water and refills tap water, the outlet water temperature of the hot water outlet will not be significantly reduced.

The second purpose of the utility model is to provide a household air-conditioning full heat recovery water heater, the water storage and insulation tank of which can discharge hot water at a large flow rate without additional configuration of a water pump.

The third purpose of the utility model is to provide a household air-conditioning total heat recovery water heater, which can also be used to heat domestic water when the air conditioner is not used in winter.

In order to achieve the above-mentioned first purpose, the utility model adopts the following technical solutions: a household air conditioner full heat recovery water heater is provided, which is refitted on an ordinary household split air conditioner outdoor unit to form a three-in-one air conditioner indoor unit, outdoor unit, and water heater for refrigeration, Hot water system. The water heater includes a water storage insulation box with a tap water inlet and a hot water outlet, and a heat exchanger connected to the household air conditioning system is arranged in the water storage insulation box, and the heat exchanger is composed of a first-stage heat exchanger and a second-stage heat exchanger. The heat exchangers are connected, wherein the first-stage heat exchanger is an immersion heat exchanger connected to the output end of the compressor of the domestic air-conditioning system, and the second-stage heat exchanger is a sleeve-type counterflow heat exchanger. The heat exchanger includes an inner tube and an outer tube, the inlet of the inner tube communicates with the immersion heat exchanger, the outlet of the inner tube communicates with the input end of the condenser of the household air conditioning system, and one end of the annulus of the outer tube is connected to the tap water Inlet, and the other end is provided with a temperature-controlled flow regulating water valve.

The water injection path is: tap water inlet, the second-stage casing type countercurrent heat exchanger, temperature-controlled flow regulating water valve, water storage insulation box (immersed heat exchanger), hot water outlet; the refrigerant path is: connected to the outdoor air conditioner Compressor outlet copper pipe, first-stage immersion heat exchanger, inner pipe of second-stage casing type counter-flow heat exchanger, copper pipe connected to the air-conditioning outdoor condenser inlet. Refrigeration releases heat and water absorbs heat to form a reverse cycle.

For the above-mentioned two-stage heat exchanger, the first stage uses an immersion heat exchanger that is completely immersed in the water in the water storage insulation tank. The 60-70°C high-temperature and high-pressure gaseous refrigerant discharged from the compressor first flows through the immersion heat exchanger. Heat the water in the water storage incubator to 55-60°C and keep the temperature constant, and the heat exchanged in this process is about 15-20%; the second stage adopts a casing type countercurrent heat exchanger, and the inner tube is connected with the submerged heat exchanger Through the flow, the refrigerant flows through the inner tube, while the tap water flows in from the tap water inlet, and flows through the annulus of the outer casing in the opposite direction. After heat exchange by the first-stage immersion heat exchanger, the refrigerant in the inner tube with a residual temperature of about 55-60°C exchanges heat with the tap water in the annulus of the outer tube with a temperature of about 15-25°C. After heating, the temperature rises by 30°C, and the water temperature is about 40-50°C when it reaches the outlet of the annulus of the outer casing. More than 80% of the generated heat is exchanged to tap water by the sleeve-type countercurrent heat exchanger, thereby realizing 100% utilization of the waste heat of the air conditioner and solving the technical problem of low utilization rate of heat energy of other air conditioner waste heat water heaters.

In the utility model, a temperature-controlled flow regulating water valve is arranged between the first-stage heat exchanger and the second-stage heat exchanger, that is, at the outlet of the annulus of the outer casing, so as to control the injected water according to the heated water temperature. The flow rate of the water can be matched with the heating capacity of the air conditioner, so that the temperature of the water injected into the water storage insulation box can be controlled above the set temperature. When the water storage insulation box releases hot water and refills tap water, the heat will not be significantly reduced. Water temperature at the water outlet. When the air conditioner is turned off, due to the temperature-controlled flow regulating water valve, when the water temperature in the second-stage heat exchanger does not reach the set temperature (for example, 40°C), the temperature-controlled flow regulating water valve is closed, so no It can flush the hot water in the cold water storage insulation box, and the temperature of the outlet water will not drop, which solves the technical problem that the hot water cannot be used when the air conditioner is not turned on for other air-conditioning waste heat water heaters.

In order to achieve the above-mentioned second purpose, the water storage insulation box adopts a pressure-bearing structure, which includes an air expansion and contraction area and a water storage area. According to a certain flow rate, it flows into the casing type countercurrent heat exchanger for heating and then injects into the water storage area, and continues to be heated and kept at constant temperature by the first-stage submerged heat exchanger. When using hot water, due to the expansion pressure of the compressed air in the water storage insulation box, large flow of hot water can be released without the need for an additional water pump, which meets the needs of showers and other daily life, improves energy saving, and the system is simple, practical and stable.

In order to achieve the above-mentioned third purpose, an additional capillary and a first bypass solenoid valve are added between the casing type countercurrent heat exchanger and the condenser of the household air conditioning system, and the input end of the original capillary of the household air conditioning system is connected to the A second bypass solenoid valve is arranged between the input ends of the compressors. The above scheme transforms the single-cooling air conditioner into an air source heat pump hot water heating system by installing control valves, throttling and bypass control, which is a dual-purpose system for air conditioning, cooling and hot water. In summer, cooling can be used to make hot water without energy consumption. , Turn on the heat pump to make hot water in winter. In winter, when the indoor unit of the air conditioner is running for cooling, the outdoor unit of the air conditioner can use the reverse Carnot cycle principle for heating. The first bypass solenoid valve installed outdoors acts to close the main road straight pipe, and the second bypass solenoid valve opens, thereby The condenser of the outdoor unit is transformed into the evaporator of the heat pump hot water system. At this time, the low-temperature and low-pressure liquid refrigerant flowing through the condenser of the outdoor unit (used as an evaporator) will evaporate and vaporize into a normal temperature gas refrigeration by absorbing the heat in the surrounding air. The refrigerant is directly bypassed to the compressor through the second bypass solenoid valve (without the original capillary tube and indoor unit), compressed into high-temperature and high-pressure liquid refrigerant, and the temperature can reach 75-85°C, and then sent to the water storage insulation box In the heat exchanger, the high-temperature and high-pressure liquid refrigerant condenses and releases heat in the heat exchanger. At this time, the heat is recovered efficiently. This technological breakthrough solves the problem that the single-cooling household cannot use the air-conditioning water heater.

The input end of the compressor is provided with an over-low pressure and anti-frost protection switch, and the output end is provided with an over-high pressure and water shortage protection switch.

The immersion heat exchanger is preferably a round copper tube coil structure.

The inner tube of the casing-type counter-flow heat exchanger is preferably a copper tube coil type, and the outer tube is preferably a pressure-bearing heat-insulating aluminum-plastic composite tube.

In summary, the utility model has advantages and beneficial effects as follows:

1. Through the two-stage heat exchanger, the full heat recovery of the air-conditioning system is realized and used to heat the water in the water storage incubator. The cooling energy efficiency ratio is as high as C0P4.5. Compared with other air-conditioning waste heat utilization water heaters, it can achieve better The cooling effect, the energy efficiency ratio is increased by more than 30%, and it also makes a further contribution to energy saving.

2. When the hot water is discharged from the water storage incubator and the tap water is refilled, the outlet water temperature will not be significantly reduced.

3. The water storage and insulation box adopts a pressure-bearing structure, equipped with an air expansion and contraction area and a water storage area. When using hot water, it can release water at a large flow without additional water pumps, which improves energy saving. The system is simple, practical and stable.

4. Using the air source heat pump conversion control technology of the outdoor unit, the single-cooling household air conditioner can also use the low-energy heat pump of the water heater to heat hot water when the cooling is not turned on, and there is no need to run the indoor unit fan.

The utility model has high practicability, and the use of air conditioners in every family and unit in southern China tends to be popularized. If every family installs the household air-conditioning waste heat utilization water heater of the present utility model, and uses the air-conditioning to avoid energy consumption and use hot water, it will be a technical revolution of human settlement life. Generally, family members use intermittent water for bathing from 18:00 to 22:00 in the evening, and use 30-60L of water each time, while using air conditioners to cool continuously. One split air conditioner (cooling capacity 2.5KW) can heat up every hour. Using heating to 55 degrees to produce 70-80 kg of hot water, cooling for 4 hours a day, equipped with a 180L water storage incubator, enough for an ordinary family of 5 to use every day. In terms of economic benefits, based on the calculation of 30KG of hot water per person per day, if an electric water heater consumes 1.04 degrees of electricity, the electricity cost is about 0.8 yuan; if a gas water heater is used to consume 0.237 cubic meters of gas, the cost is about 0.3 yuan, which is equivalent to 0.34 kg of standard coal consumption; For example, if 50 million people use air-conditioning waste water heaters, the annual energy saving and consumption reduction is equivalent to 6.2 million tons of standard coal, and the economic benefits exceed 50 billion. The social and economic benefits are extremely significant.

Description of drawings

Fig. 1 is a schematic diagram of the system connection of the present invention.

The specific embodiment of the utility model will be further described below in conjunction with the accompanying drawings.

Detailed ways

Referring to Fig. 1, the household air conditioner full heat recovery water heater of the present utility model is refitted on an ordinary household split air conditioner outdoor unit, and the household air conditioner system is generally composed of an indoor unit 18 and an outdoor unit 19, the indoor unit 18 has an evaporator 15, and the outdoor unit 19 has a A first capillary tube 17 is arranged between the compressor 1 and the condenser 14, the evaporator 15 and the condenser 14, the input end of the compressor 1 is provided with an over-low pressure and anti-frost protection switch 2, and the output end is provided with an over-high pressure protection switch 2. And water shortage switch 3. The water heater includes a water storage insulation box 8 with a tap water inlet 6 and a hot water outlet 7, a pressure reducing valve is arranged at the tap water inlet 6, and a two-stage heat exchanger connected to an outdoor unit 19 is arranged in the water storage insulation box 8 , the first-stage heat exchanger is an immersion coil heat exchanger 10 connected to the output end of the compressor 1 through a high-temperature and high-pressure exhaust pipe 4, and the second-stage heat exchanger is a sleeve-type counterflow heat exchanger 9, and the sleeve Type countercurrent heat exchanger 9 is made up of inner tube 91 and outer tube 92, inner tube 91 is copper tube coil type, outer tube 92 is pressure-bearing heat-insulating aluminum-plastic composite tube. The inlet of the inner pipe 91 communicates with the immersion coil heat exchanger 10 , and the outlet of the inner pipe 91 communicates with the input end of the condenser 14 through the condensed high-pressure normal temperature pipe 5 . The annulus of the outer casing 92 has a water inlet 921 connected to the tap water inlet 6 and a water injection port 922 that can be opened toward the water storage and heat preservation tank 8 . The 60-70°C high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 first flows through the immersion coil heat exchanger 10 to heat the water 20 in the water storage insulation tank 8 to 55-60°C and keep it warm. The heat exchanged in this process It is about 15-20%; the inner tube 91 of the casing type countercurrent heat exchanger 9 communicates with the submerged coil heat exchanger 10, the refrigerant flows through the inner tube 91, and the tap water flows from the water storage insulation box 8 The tap water inlet 6 flows in, flows into the annulus of the outer sleeve 92 from the water inlet 921 , and flows through the annulus of the outer sleeve 92 in the opposite direction. After heat exchange by the immersion coil heat exchanger 10, the refrigerant in the inner tube 91 with a residual temperature of about 55-60°C exchanges heat with the tap water in the annulus of the outer casing at a temperature of about 15-25°C. After absorbing heat, the temperature rises by 30°C, and when it reaches the water injection port 922 in the annulus of the outer casing, the water temperature is about 40-50°C, and the refrigerant in the inner pipe 91 cools down by 25°C after releasing heat, and flows out from the inner pipe 91 and flows into high-pressure normal temperature after condensation The temperature of the refrigerant in the tube 5 is about 20-30°C, and more than 80% of the heat generated by the air-conditioning refrigeration is exchanged to the tap water by the sleeve-type countercurrent heat exchanger 9, thereby realizing 100% utilization of the waste heat of the air-conditioning and solving the problem of Other technical problems of low heat energy utilization rate of air-conditioning waste heat water heaters.

In order to avoid significantly reducing the outlet water temperature of the hot water outlet 7 when the water storage insulation tank 8 releases hot water and reinjects tap water, between the submerged coil heat exchanger 10 and the casing type counterflow heat exchanger 9, that is, A temperature-controlled flow regulating water valve 11 is arranged at the water injection port 922 of the annulus of the outer casing to control the flow of injected water according to the heated water temperature, so that the amount of injected water matches the heating capacity of the air conditioner, so that the injected and stored water can be kept warm. The water temperature of case 8 is controlled above the temperature of setting, can not obviously reduce the outlet water temperature of hot water outlet 7 when water storage insulation case 8 puts hot water and injects tap water again. The structure and working principle of the temperature-controlled throttle valve belong to relatively mature technologies and means in this field, and will not be described in detail here. When the air conditioner is turned off, due to the use of the temperature-controlled flow regulating water valve 11, when the water temperature in the casing type counterflow heat exchanger 9 does not reach the set temperature (for example, 40°C), the temperature-controlled flow regulating water valve 11 is closed state, so the hot water 20 in the cold water storage insulation box 8 can not be flushed, and the outlet water temperature of the hot water outlet 7 will not decrease, which solves the technical problem that hot water cannot be used when the air conditioner is not turned on for other air-conditioning waste heat water heaters.

The water storage insulation box 8 adopts a pressure-bearing structure, which includes an air expansion and contraction area and a water storage area. When entering water, the water pressure in the water storage insulation box 8 is used to compress the air 21, and the tap water flows into the casing type The countercurrent heat exchanger 9 is heated and then injected into the water storage area, and the submerged coil heat exchanger 10 continues to heat and keep warm. When hot water is used, due to the pressure of the compressed air 21 in the water storage insulation box 8, a large flow of hot water can be released without the need for an additional water pump, which meets the needs of life such as showers and improves energy saving. The system is simple, practical and stable.

A first bypass solenoid valve 12 is provided in the main pipeline between the casing type counterflow heat exchanger 9 and the condenser 14 of the outdoor unit 19, and a first bypass solenoid valve 12 is connected between the inlet and outlet ends of the first bypass solenoid valve 12. Road 22, the first bypass 22 is provided with a second capillary 13; between the input end of the first capillary 17 and the input end of the compressor 1, a second bypass 23 is connected, and the second bypass 23 is provided with There is a second bypass solenoid valve 16 . The above scheme transforms the single-cooling air conditioner into an air source heat pump for hot water heating by installing solenoid valves, throttling and bypass control, and forms an air-conditioning refrigeration and hot water dual-purpose unit. Turn on the heat pump for hot water. In winter, when the indoor unit 18 does not use the air conditioner for cooling, the outdoor unit 19 of the air conditioner can be heated by the reverse Carnot cycle principle, and the first bypass solenoid valve 12 installed on the outdoor unit 19 acts to close the main pipeline, bypassing the second capillary tube 13, The condenser 14 of the outdoor unit 19 is converted into an evaporator, at this time, the low-temperature and low-pressure liquid refrigerant flowing through the outdoor unit condenser 14 (used as an evaporator) will evaporate and vaporize into a normal temperature gaseous refrigerant by absorbing the heat in the surrounding air , open the second bypass solenoid valve 16, directly bypass the first capillary tube 17 and the indoor unit 18 to the compressor 1, compress it into a high-temperature and high-pressure liquid refrigerant, and the temperature can reach 75-85°C, and then send it to the storage water The heat exchangers 10 and 9 in the insulation box 8, the high-temperature and high-pressure liquid refrigerant condenses and releases heat in the heat exchangers 10 and 9, and the heat is recovered efficiently at this time. This technological breakthrough solves the problem that other air-conditioning water heaters must be heated to The problem of hot water.

Claims (3)

1. A household air conditioner full heat recovery water heater, comprising a water storage insulation box with tap water inlet and hot water outlet, the water storage insulation box is provided with a heat exchanger connected to the household air conditioning system, characterized in that: the heat exchanger The heat exchanger is connected by a first-stage heat exchanger and a second-stage heat exchanger, wherein the first-stage heat exchanger is an immersion heat exchanger connected to the output end of the compressor of the household air-conditioning system, and the second-stage heat exchanger is A casing type countercurrent heat exchanger, the casing type countercurrent heat exchanger includes an inner tube and an outer tube, the inlet of the inner tube is connected to the submerged heat exchanger, and the outlet of the inner tube is connected to the input end of the condenser of the household air conditioning system One end of the annulus of the outer casing is connected to the tap water inlet, and the other end is provided with a temperature-controlled flow regulating water valve. 2. The total heat recovery water heater for household air conditioners according to claim 1, characterized in that: the water storage insulation box adopts a pressure-bearing structure, which includes an air expansion and contraction area and a water storage area. 3. The total heat recovery water heater for household air-conditioning according to claim 2, characterized in that: an additional capillary and a first bypass solenoid valve are added between the casing type countercurrent heat exchanger and the condenser of the household air-conditioning system. A second bypass solenoid valve is provided between the input end of the original capillary tube of the air conditioning system and the input end of the compressor.

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