CN101021374A - Water heating device of ground source heat pump - Google Patents

Abstract

In the hot water device of the ground source heat pump, the exhaust pipe of the compressor (1) and the water-cooled sleeve condenser (2), the throttling capillary (3), the evaporator (4), and the suction of the compressor (1) The pipes are connected to form a closed loop circuit; the hot water tank (6) is connected to the water side of the sleeve condenser (2) through the water pump (5) to form a circulation loop; the underground coil heat exchanger (8) passes through the underground coil water pump (7) It is connected to one end of the water side of the evaporator (4), and the other end of the water side of the evaporator (4) is connected to the first valve (9), and the outlet of the first valve (9) is respectively connected to the second valve (10) through a tee. ) and the third valve (11), the outlet of the third valve (11) is connected to the other end of the underground coil heat exchanger (8), the second valve (10) is connected to the fourth valve (12) and the ground through a three-way In the second refrigerant water heat exchanger (17) of the source heat pump air conditioning system, the other end of the fourth valve (12) is connected to the water outlet of the underground coil water pump (7).

Description

Ground source heat pump water heater

technical field

The invention applies the principle of a ground source heat pump to provide domestic hot water, and belongs to the technical field of ground source heat pumps and water heaters.

Background technique

At present, many experimental studies and theoretical simulation calculations have shown that in actual use of ground source heat pump air-conditioning devices, especially in the south of the Yangtze River, there is an imbalance between heat discharge to the ground in summer and heat extraction from the ground in winter, which leads to underground soil pollution. As the temperature rises, the energy efficiency ratio of the ground source heat pump device will decrease or even fail to work normally after several years of use. Therefore, it is recommended to use auxiliary heat removal measures in the ground source heat pump system, such as installing cooling towers and other methods of heat removal to the environment. use.

At the same time, there are three types of water heaters commonly used in my country: gas water heaters, electric water heaters, and solar water heaters. At the same time, air source heat pump water heaters are gradually being accepted by consumers. The energy utilization rate of air source heat pump water heater is better than that of electric water heater and gas water heater, which may be close to solar water heater, but air source heat pump water heater overcomes the consequence that solar water heater cannot be used in rainy days, but the energy efficiency ratio of air source heat pump is greatly affected by the atmospheric environment Due to temperature constraints, the energy efficiency ratio is very low in winter, and in winter, the outdoor air heat exchanger frosts and needs to be defrosted, which also reduces the energy efficiency ratio of the air source heat pump water heater, and at the same time increases the complexity of the system and reduces reliability. .

The present invention proposes a ground source heat pump hot water system, which utilizes the principle of the ground source heat pump to produce domestic hot water. The energy utilization rate of the system is higher than that of traditional gas and electric water heaters, and it is also better than solar water heaters and air source heat pump water heaters. Hot water is provided uninterrupted throughout the year, and there is no problem of frosting and defrosting after environmental changes in winter. At the same time, since the heat source of the ground source heat pump water heater is the underground soil, the integrated construction of the ground source heat pump water heater and the underground coil of the ground source heat pump air conditioning system can alleviate the actual use of the ground source heat pump air conditioner, especially in the south of the Yangtze River. In China, there is a defect that the heat discharge to the ground in summer and the heat from the ground in winter are unbalanced, which leads to the increase of underground temperature, which makes the energy efficiency ratio of the ground source heat pump device decrease or even fail to work normally after several years of use, and the hot water of the ground source heat pump After the system is integrated with the underground coil of the ground source heat pump air conditioning system, the condensation temperature of the ground source heat pump air conditioning unit can be reduced in summer, and the operating energy efficiency ratio of the unit can be improved.

Contents of the invention

Technical problem: The purpose of this invention is to provide a ground source heat pump hot water device that can be installed independently or simultaneously with the ground source heat pump air conditioner, which can provide domestic hot water uninterrupted throughout the year, and the energy efficiency ratio is higher than other production and living conditions. Ways of hot water such as gas hot water, electric water heaters, air source heat pump water heaters, and ground source heat pump water heaters combined with ground source heat pump air-conditioning systems can alleviate the heat dissipation of ground source heat pump air-conditioning systems to the soil in summer, which is much higher than the heat absorbed in winter. In order to extend the service time of the ground source heat pump air-conditioning system and improve the energy utilization rate of the whole system.

Technical solution: The hot water device of the ground source heat pump of the present invention is composed of a compressor, a casing condenser, a throttling capillary, an evaporator, a condenser, a water tank, underground pipes, a water pump, and valves.

The device includes a compressor, a casing condenser, a throttling capillary, an evaporator, a hot water tank, an underground coil heat exchanger, a water tank pump, an underground coil pump, the first valve, the second valve, the third valve, the first Four valves; the exhaust pipe of the compressor is connected to the water-cooled sleeve condenser, the throttle capillary, the evaporator, and the suction pipe of the compressor to form a closed loop circuit; the hot water tank is connected to the sleeve condenser water through the water pump Side-to-side communication constitutes a circulation loop; the underground coil heat exchanger is connected to one end of the water side of the evaporator through the underground coil water pump, the other end of the water side of the evaporator 4 is connected to the first valve, and the outlet of the first valve is respectively connected to the second valve through a tee. The second valve and the third valve, the outlet of the third valve is connected to the other end of the underground coil heat exchanger, the second valve is connected to the fourth valve and the second refrigerant water heat exchanger of the ground source heat pump air conditioning system through a tee, The other end of the fourth valve is connected with the water outlet of the underground coil water pump.

A ground source heat pump air-conditioning system can also be connected in parallel on the device, that is, it can be used in conjunction with the ground source heat pump air-conditioning system to form a composite ground-source heat pump water heater. The second compressor in the ground-source heat pump air-conditioning system is connected to the four-way valve The two ends of the four-way valve are connected with the second refrigerant water heat exchanger, throttling device, and the first refrigerant water heat exchanger to form a closed loop. The first refrigerant water heat exchanger and the air conditioning cycle The water pump and the fan coil are connected to form a closed circuit, the outlet end of the second refrigerant water heat exchanger is connected to the underground coil heat exchanger, and the inlet end of the second refrigerant water heat exchanger is connected to the second valve.

The system uses the principle of ground source heat pump to produce domestic hot water. The energy utilization rate of the system is higher than that of traditional gas and electric water heaters, and it is also better than solar water heaters and air source heat pump water heaters. It can provide hot water continuously throughout the year. Problems with frosting and defrosting after environmental changes in winter. At the same time, since the heat source of the ground source heat pump water heater is the soil, after the integrated construction of the ground source heat pump water heater and the ground coil of the ground source heat pump air conditioning system, it can alleviate the actual use of the ground source heat pump air conditioner, especially in the areas south of the Yangtze River. The unbalanced heat discharge to the ground in summer and heat extraction from the ground in winter leads to the rise of underground temperature, which causes the energy efficiency ratio of the ground source heat pump device to decrease or even fail to work normally after several years of use. The condensing temperature of the unit improves the operating energy efficiency ratio of the unit.

Beneficial effects: The beneficial effects of the present invention are: 1. Provide domestic hot water uninterrupted throughout the year, and the energy utilization rate is much higher than that of ordinary electric and gas water heaters. It overcomes the need for auxiliary power when the water temperature of solar water heaters is not high in rainy days and cannot be used normally. Disadvantages of heating. Compared with air source heat pump water heaters, its energy efficiency ratio is slightly better than that of air source heat pump water heaters, and the operating conditions are more stable, and there is no problem of frosting and defrosting in winter; 2. Ground source heat pump water heaters and ground source heat pump air conditioning systems Combined use can effectively alleviate the problem that the common ground source heat pump air-conditioning system discharges heat to the soil in summer and absorbs heat from the soil in winter, resulting in lower energy efficiency ratio or even inoperability. , can also improve the energy efficiency ratio of the ground source heat pump air conditioning system

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Among them are: compressor 1, casing condenser 2, throttling capillary 3, evaporator 4, hot water tank 6, underground coil heat exchanger 8, water tank pump 5, underground coil pump 7, first valve 9, The second valve 10, the third valve 11, the fourth valve 12;

The second compressor 13 , the four-way valve 14 , the first refrigerant water heat exchanger 15 , the throttling device 16 , the second refrigerant water heat exchanger 17 , the air conditioning circulating water pump 18 , and the fan coil 19 .

Detailed ways

The ground source heat pump hot water system of the present invention comprises a compressor 1, a casing condenser 2, a throttling capillary 3, an evaporator 4, a hot water tank 6, an underground coil heat exchanger 8, a water tank pump 5, and an underground coil water pump 7. The first valve 9, the second valve 10, the third valve 11, the fourth valve 12 and so on. Wherein the exhaust pipe of the compressor 1 is connected with the water-cooled sleeve condenser 2, the throttling capillary tube 3, the evaporator 4, and the suction pipe of the compressor 1 to form a closed loop circuit; The water side of the tube condenser 2 is connected to form a circulation loop; the underground coil heat exchanger 8 is connected to one end of the water side of the evaporator 4 through the underground coil water pump 7, and the other end of the water side of the evaporator 4 is connected to the first valve 9, the second The outlet of one valve 9 is respectively connected to the second valve 10 and the third valve 11 through a three-way, the outlet of the third valve 11 is connected to the other end of the underground coil heat exchanger 8, and the second valve 10 is connected to the fourth valve 12 through a three-way It is connected with the second refrigerant water heat exchanger 17 of the ground source heat pump air conditioning system, and the other end of the fourth valve 12 is connected with the water outlet of the underground coil water pump 7 .

A ground-source heat pump air-conditioning system can also be connected in parallel on the device, that is, it can be used in conjunction with the ground-source heat pump air-conditioning system to form a composite ground-source heat pump water heater. The second compressor 13 in the ground-source heat pump air-conditioning system is connected to the four-way The two ends of the valve 14 and the other two ends of the four-way valve 14 are connected with the second refrigerant water heat exchanger 17, the throttling device 16, and the first refrigerant water heat exchanger 15 to form a closed circuit, and the first refrigerant water The heat exchanger 15, the air conditioning circulating water pump 18, and the fan coil 19 are connected to form a closed loop, the outlet end of the second refrigerant water heat exchanger 17 is connected to the underground coil heat exchanger 8, and the second refrigerant water heat exchanger The inlet end of 17 is connected with the second valve 10 .

When the device is running, the refrigerant passes through the exhaust pipe of the compressor 1, enters the sleeve condenser 2 to release heat to feed water, and then enters the capillary tube 3 for throttling, and the throttled refrigerant enters the evaporator 4 for absorption in the underground coil The heat of water vaporizes, and the refrigerant vapor enters the compressor to be compressed to complete a cycle. After absorbing heat in the condenser, the heated hot water enters the water tank, and the water in the water tank is pumped into the sleeve condenser to absorb heat through the water pump. After the water in the underground coil emits heat in the evaporator, it enters the underground coil to absorb heat from the soil and heat up, and then enters the evaporation through the water pump to continue releasing heat. This system uses the heat pump function to absorb heat from the soil to obtain domestic hot water with a temperature of about 50°C.

The ground source heat pump water heater can overcome the frosting and defrosting problem of the air source heat pump water heater in winter. At the same time, because the ground source heat pump water heater absorbs heat from the soil, and in summer when it is in hot water supply mode, the heat discharge to the soil is reduced, so it can alleviate the heat discharge of ordinary ground source heat pumps to the soil when it is used in the southern region, which is much higher than that from the soil in winter. The increase in soil temperature caused by heat extraction in the middle leads to the problem that the energy efficiency of the ordinary ground source heat pump air conditioning system is relatively low or even unable to operate after several years of use.

A first valve 9 , a second valve 10 , a third valve 11 and a fourth valve 12 are set in the local source heat pump hot water system. In summer, the first valve 9 and the second valve 10 are opened, and the third valve 11 and the fourth valve 12 are closed. At this time, the water in the underground coil first enters the evaporator of the ground source heat pump water heater to release heat and cool down, and then enters the ground source heat pump. For the outdoor second refrigerant water heat exchanger (condenser) of the air conditioner, since the temperature of the water in the underground coil decreases in the evaporator of the ground source heat pump water heater, the condensation temperature of the condenser of the ground source heat pump air conditioner will decrease. This improves the energy efficiency ratio of the ground source heat pump air conditioner. In spring, autumn and winter, the second valve 10 is closed, the third valve 11, the fourth valve 12, and the first valve 9 are opened, and the evaporator of the ground source heat pump water heater and the outdoor refrigerant water heat exchanger of the ground source heat pump air conditioning system are connected in parallel run.

Claims (2)

1, a kind of hot water apparatus of earth source heat pump, it is characterized in that this device comprises compressor (1), double-pipe condenser (2), throttle capillary tube (3), evaporimeter (4), boiler (6), underground coil heat exchanger (8), water tank water pump (5), lower coil pipe water pump (7), first valve (9), second valve (10), the 3rd valve (11), the 4th valve (12); Wherein the air intake duct of (1) of the blast pipe of compressor (1) and water cold sleeve condenser (2), throttle capillary tube (3), evaporimeter (4), compressor connects into the loop checking installation of a closure; Hot water (6) is by water pump (5) the formation closed circuit that is connected with double-pipe condenser (2) water side; Underground coil heat exchanger (8) links to each other with water side one end of evaporimeter (4) by ground lower coil pipe water pump (7), an other end of evaporimeter 4 water sides connects first valve (9), first valve (9) outlet connects second valve (10) and the 3rd valve (11) respectively by threeway, the outlet of the 3rd valve (11) links to each other with an other end of underground coil heat exchanger (8), second valve (10) connects the second cold-producing medium water-to-water heat exchanger (17) of the 4th valve (12) and geothermal heat pump air-conditioning system by threeway, and an other end of the 4th valve (12) is connected with the delivery port of ground lower coil pipe water pump (7).

2, the hot water apparatus of earth source heat pump according to claim 1, it is characterized in that on this device also can geothermal heat pump air-conditioning system in parallel, promptly unite and use the hot water apparatus of forming a compound earth source heat pump with geothermal heat pump air-conditioning system, second compressor (13) in the geothermal heat pump air-conditioning system connects the two ends of cross valve (14), the two ends and the second cold-producing medium water-to-water heat exchanger (17) in addition of cross valve (14), throttling arrangement (16), the first cold-producing medium water-to-water heat exchanger (15) connects into a closed-loop path, the first cold-producing medium water-to-water heat exchanger (15), air-conditioner circulating water pump (18), fan coil (19) connects into a closed-loop path, the port of export of the second cold-producing medium water-to-water heat exchanger (17) is connected with underground coil heat exchanger (8), and the arrival end of the second cold-producing medium water-to-water heat exchanger (17) is connected with second valve (10).

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