WO2006045228A1

WO2006045228A1 - A heat pump system using water as energy source

Info

Publication number: WO2006045228A1
Application number: PCT/CN2004/001271
Authority: WO
Inventors: Shengheng Xu
Original assignee: Shengheng Xu
Priority date: 2004-10-26
Filing date: 2004-11-08
Publication date: 2006-05-04
Also published as: CN1320325C; CN1769816A

Abstract

A heat pump system by using water as energy source, includes an energy-collecting equipment, a second heat exchanger, an energy-exalting equipment, a first heat exchanger and a radiator connected in series. The energy-collecting equipment includes a circuit of a low-grade heat exchanger coil, a collector well and a diving pump inside the well in series. The energy-exalting equipment includes a circuit of an evaporation, two compressors, a condenser and a expansion valve in series, the said two compressors are connected in parallel. The radiator includes a circuit of an energy-inputting coil, a pump and several radiation fin in series. Inside the first and second heat exchanger, there is antifreeze. The system has a simple structure, which is easily to install and maintain, and can supply heat or cold to users normally in any case.

Description

Technical field

The invention relates to a heat pump system for extracting water energy, in particular to a heat pump system for extracting energy of rivers, lakes and seas or groundwater, which is to convert low-grade heat energy into high-grade heat energy by heat pump to achieve winter heating, summer cooling and daily supply of domestic hot water. the goal of. Background technique

The liquid cold heat source system using the river water of the rivers and lakes as the energy source of the Chinese invention patent number ZL00123491.9, which the applicant applied for earlier, provides a kind of use of sea water, river water or river water as energy, pollution-free, and land occupation. Small, and can provide a hot and cold source system for domestic hot water. However, in the winter, the system often causes the evaporator of the heat pump to freeze due to the low temperature of the river water in the river, or the evaporator freezes due to power outage or water stop, which makes the system unable to work normally, thus making the system not widely available and widely used. . Summary of the invention

In order to overcome the deficiencies in the prior art, an object of the present invention is to provide a heat pump system for extracting water energy, which can safely and effectively utilize heat in rivers, lakes or seawater to achieve winter heating and summer cooling.

In order to achieve the object of the present invention, the present invention provides a hot food system for extracting water energy, comprising: a water energy collecting device, an energy lifting device and a heat sink which are sequentially connected in series, the water energy collecting device comprising The submersible pump, the low energy side heat exchange coil and the heat collecting well in the heat collecting well are sequentially connected in series, and the energy lifting device comprises: a circuit consisting of an evaporator, a compressor, a condenser and an expansion valve in series. The heat sink includes: a circuit consisting of an energy input coil, a circulation pump and a plurality of fins in series, wherein a first heat exchange device is disposed between the energy lifting device and the heat sink, the first exchange The heat device comprises: a circuit consisting of a high-potential side heat exchange coil, an outlet pump and an energy output coil connected in series, the condenser and the high-potential side heat exchange coil being coupled, the energy of the radiator The input coil is coupled to the energy output coil of the first heat exchange device, and a second heat exchange is provided between the energy boosting device and the water energy harvesting device The second heat exchange device comprises: a circuit consisting of a quantity input coil, an energy output coil and a liquid return pump in series, wherein the energy input coil of the second heat exchange device exchanges heat with the low energy side The coil is coupled, the energy output coil of the second heat exchange device is coupled to the evaporator, and the liquid flowing in the first heat exchange device and the second heat exchange circuit is antifreeze, the compressor It consists of a first compressor and a second compressor that are connected in parallel with each other.

The heat pump system for extracting water energy according to the present invention, wherein the hot food system for extracting water energy further comprises: a first two-position four-way reversing valve and a second two-position four-way reversing valve, wherein the first two-position four-way reversing valve The first interface of the reversing valve is connected to the liquid outlet end of the energy input coil of the second heat exchange device, and the second interface of the first two-position four-way reversing valve is exchanged with the high energy side of the first heat exchange device The liquid inlet end of the hot coil is connected, and the third interface of the first two-position four-way reversing valve is connected with the IB liquid end of the energy output coil of the first heat exchange device, and the fourth one of the first two-position four-way reversing valve The interface is connected to the liquid inlet end of the energy output coil of the second heat exchange device; the first interface of the second two-position four-way reversing valve is connected to the liquid outlet end of the liquid return pump of the second heat exchange device, and the second two positions The second port of the four-way valve is connected to the liquid inlet end of the energy output coil of the first heat exchange device, the third port of the second two-position four-way selector valve and the outlet of the first heat exchange device The liquid ends are connected, and the fourth interface of the second two-position four-way reversing valve is connected to the liquid inlet end of the energy input coil of the second heat exchange device. '

The heat pump system for extracting water energy of the present invention, wherein the first compressor and the second compressor are adjustable speed compressors.

In the heat pump system for extracting water energy of the present invention, a heating pipe of the water heater is connected between the first and second compressors and the condenser.

The heat pump system for extracting water energy according to the present invention, wherein the low energy side heat exchange coil of the water energy harvesting device and the energy input coil of the second heat exchange device coupled thereto are made into a plate heat exchanger, the The energy transfer tti coil of the two heat exchange device and the evaporator coupled thereto are made into a needle welded plate heat exchanger, and the condenser and the high energy side heat exchange coil of the first heat exchange device coupled thereto are made A brazed plate heat exchanger, the energy output coil of the first heat exchange device and the energy input coil of the radiator coupled thereto are made into a plate heat exchanger.

The heat pump system for extracting water energy according to the present invention, wherein the water is water or groundwater of rivers and lakes.

The heat pump system for extracting water energy of the present invention has the following advantages compared with the prior art liquid cold heat source system using rivers and lakes as energy sources:

1. Because the heat provided by the energy booster decreases with the evaporator temperature, the heat is reduced, and the load for winter supply and summer cooling also varies with temperature. The change in temperature is just the same as the energy provided by the heat pump. In order to make rational use of energy, in the present invention, two compressors are connected in parallel, and one compressor is used when the weather is not cold in winter, two compressors are used when the weather is cold, and a variable speed compressor is used. By increasing or decreasing the speed of the compressor, the heat provided by the energy boosting device is increased or decreased, so that the most reasonable use of the source. Further, since the liquid flowing in the first and second heat exchange devices of the present invention is an antifreeze liquid, freezing does not occur, thereby ensuring that the helium system can also operate normally under low temperature conditions.

2. Due to the unremovability of brazed plate heat exchangers, clogging and freezing are limited. The invention controls the high energy side heat exchange plate of the first heat exchange device coupled with the condenser and the coupled heat exchanger, the energy output coil of the first heat exchange device and the heat sink coupled thereto The energy input coil is made into a detachable plate heat exchanger, and the liquid flowing in the closed circuit of the first heat exchange device is antifreeze; the energy output control of the evaporator and the second heat exchange device coupled thereto becomes brazing The plate heat exchanger, the energy input coil of the second heat exchange device and the low energy side heat exchange coil of the water energy collecting device coupled thereto are made into a detachable plate heat exchanger, and the second heat exchange device closed circuit The liquid flowing in the liquid is also antifreeze. The present invention allows the refrigerant flowing inside the two brazed plate heat exchangers to flow the antifreeze on the outside, thus fully utilizing the advantages of the brazed plate heat exchanger while avoiding Shortcomings, both improved heat transfer efficiency and increased brazing plate type The service life of the heat exchanger does not cause freezing, clogging and scaling, thus ensuring the operation of the hot spring system for extracting water energy.

3. Two two-position four-way reversing valves are arranged on the heat pump system for extracting water energy, and heating or cooling is performed by changing the position of the four-position four-way reversing valve.

4. Due to the use of brazed plate heat exchangers, the size of the system is greatly reduced. At the same time, system components and power distribution panels other than heat collecting wells and heat sinks can be made into an integrated component, eliminating the need for on-site installation and truly achieving on-site installation and factoryization, which saves both cost and engineering quality. DRAWINGS

1 is a schematic view of a heat pump system for extracting water energy according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

' Refer to Figure 1. The "water" used in the heat pump system for extracting water energy shown in Fig. 1 refers to the water of the rivers and lakes or the water obtained by excavating the underground. The system comprises: a water energy collecting device 4 in series, and an energy lifting device 1 And the radiator 3, the water energy collecting device 4 comprises: a circuit comprising a submersible pump 23 installed in the heat collecting well 20, a low energy side replacement coil 5 and a collecting well 20 in series, and the energy lifting device 1 comprises: A circuit consisting of an evaporator 18, a compressor, a condenser 19 and an expansion valve 15 in series, the radiator 3 comprises: a circuit consisting of an energy input coil 6, a circulating spring 9 and a plurality of fins 21 in series, in energy A first heat exchange device 2 is disposed between the lifting device 1 and the radiator 3. The first heat exchange device 2 includes: a high-position side heat exchange coil 16, an outlet pump 8, and an energy output coil 17 connected in series. a circuit, between the energy lifting device 1 and the water energy collecting device 4, a second heat exchange device 22 is provided. The second heat exchange device 22 comprises: an energy input coil 24, an energy output coil 25 and a liquid return pump 7 in sequence. The circuits formed in series, the liquid flowing in the circuits of the first heat exchange device 2 and the second heat exchange device 22 are antifreeze, and the energy lifting device 1 comprises: a first compressor 11 and a second compressor 12 which are adjustable in speed, Parallel in the circuit of the energy boosting device 1, in the two compressors 11, 12 with the cold? The heating pipe 10 of the water heater is connected in series between the suspects 19 to provide hot water for daily life.

The heat pump system for extracting water energy further comprises: a first two-position four-way reversing valve 13 and a second two-position four-way reversing valve 14 to achieve winter heating and summer cooling by changing the position of the four-position four-way reversing valve. purpose. The first interface 13a of the first two-position four-way switching valve 13 is connected to the liquid outlet end of the energy input coil 24 of the second heat exchange device 22, and the second interface 13b of the first two-position four-way switching valve 13 is The first heat exchange device 2 is connected to the liquid inlet end of the high energy side heat exchange coil 16 , and the third interface 13 c of the first two-position four-way reversing pottery 13 and the liquid output coil 17 of the first heat exchange device 2 are discharged. Duan Xianglian, the fourth interface 13d of the first two-position four-way reversing valve 13 is connected to the liquid inlet end of the energy output coil 25 of the second heat exchange device 22; the first of the second two-position four-way reversing valve 14 The interface 14a is connected to the liquid outlet end of the liquid return pump 7 of the second heat exchange device 22, the second interface 14b of the second two-position four-way switching valve 14 and the liquid inlet end of the energy output coil 17 of the first heat exchange device 2. Xianglian, the third interface 14c of the second two-position four-way reversing valve 14 is connected with the liquid outlet end of the first heat exchange device 2 outlet pump 8, the second two The fourth port 14d of the four-way reversing valve 14 is connected to the liquid inlet end of the energy input coil 24 of the second heat exchange device 22. The low energy side heat exchange coil 5 of the water energy harvesting device 4 and the energy input coil 24 of the second heat exchange device 22 coupled thereto are formed into a plate heat exchanger, and the energy output coil 25 of the second heat exchange device 22 The evaporator 18 of the energy lifting device 1 coupled therewith is formed as a brazed plate heat exchanger, the condenser 19 of the energy lifting device 1 and the high energy side heat exchange coil 16 of the first heat exchange device 2 coupled thereto A brazed plate heat exchanger is formed, and the energy output coil 17 of the first heat exchange device 2 and the energy input coil 6 of the heat sink 3 coupled thereto are formed into a plate heat exchanger.

The working principle of a heat pump system for extracting water energy;

(1) The working process of the heat pump system for extracting water energy according to the present invention during heating in winter

Figure 1 is a schematic illustration of a heat pump system for extracting water energy. In the winter heating state, the spool positions of the first two-position four-way selector valve 13 and the second two-position four-way selector valve 14 are as shown, SP: perpendicular to the pipe connected thereto, at this time, The first interface a of the two-position four-way switching valve 13 and the second two-position four-way switching valve 14 are respectively connected with the fourth interface d of the same, and the second interface b respectively corresponds to them The third interface c is connected.

The submersible pump 23 is activated, and the submersible pump 23 extracts the water in the heat collecting well 20 into the low energy side heat exchange coil 5 to release heat. After releasing the heat, the cooled water enters the heat collecting well 20 to absorb the heat of the water in the heat collecting well 20, and then Continue to pass the submersible pump into the low energy side heat exchange coil 5 to release heat. At the same time, the liquid return pump 7 is activated, and the liquid return pump 7 extracts the antifreeze liquid of the energy output coil 25 of the second ripening device 22, and the antifreeze passes through the first interface 14a and the fourth interface of the second two-position four-way switching valve 14. 14d flows into the energy input coil 24 of the second heat exchange device 22, the antifreeze liquid receives heat from the energy input coil 24 of the second heat exchange device 22, and the warmed antifreeze liquid passes through the first two-position four-way reversing valve The first interface 13a and the fourth interface 13d of 13 again enter the energy output coil 25 of the second heat exchange device 22 to release heat.

The working fluid in the evaporator 18 of the energy lifting device 1 absorbs the energy flowing through the energy output coil 25 of the second heat exchange device 22 to evaporate into a gas, and the gas is compressed and heated by the first compressor 11 and/or the second compressor 12. (Depending on the outside temperature, it is decided to start a compressor or start two compressors. Generally speaking, when the outside temperature is not too low, only one compressor needs to be started. When the outside temperature is very low, two compressors must be started at the same time.) And heating the domestic hot water through the heater 10 of the water heater for people to wash. The heat is released by the condenser 19 to the high-energy side heat exchange coil 16 of the first heat exchange device 2, and the condensed liquid working medium is decompressed by the expansion valve 15, and then enters the evaporator 18 again. Endothermic... so repeated cycles.

The temperature-increasing antifreeze is exchanged by the liquid discharge pump 8 through the second two-position four-way reversal. The third interface 14c of the wide 14 and the second interface 14b are sent to the energy output coil 17 of the first heat exchange device 2 to release heat. The cooled antifreeze liquid flows into the high-position side heat exchange coil 16 of the first heat exchange device 2 through the third interface 13c and the second interface 13b of the first two-position four-way switching valve 13 to absorb heat, so that the cycle is repeated. The heat is supplied to the heat exchanger 3 of the heat sink 3 coupled to the energy output coil 17 of the first heat exchanger 2, and the heat is continuously supplied to the heat sink 21 (ie, the user) by the circulation pump 9. To achieve the purpose of heating.

(2) The working process of the heat pump system for extracting water energy in the present invention during cooling in summer In this state, the spools of the first two-position four-way selector valve 13 and the second two-position four-way selector valve L4 are rotated by 90° with respect to the jaw shown in FIG. 1 in a position parallel to the pipe connected thereto. At this time, the first interface a of the first two-position four-way switching valve 13 and the two-position four-way switching valve 14 are respectively connected with their corresponding second interfaces b, and the third interface c The corresponding fourth interface d is connected to each other.

The diving spring 23 is started, and the submersible pump 23 extracts the water in the collecting well 20 into the low-side heat exchange coil 5 to release the cooling amount. The cooling water after the cooling amount enters the collecting well 20 and absorbs the cooling capacity of the collecting well 20. Then, continue to pass the submersible pump into the low-cost side heat exchange coil 5 to release the cooling capacity. The energy input coil 24 of the second heat exchange device 22 absorbs the cold amount of the low energy side heat exchange coil 5, and the antifreeze passes through the first interface 13a of the first two-position four-way valve 13 and functions as the discharge pump 8. After the second connection 13b enters the high-energy side heat exchange coil 16 of the first heat exchange device 2 to release the cold, the warmed antifreeze liquid returns to the third interface 14c and the fourth interface 14d of the second two-position four-way valve 14 The energy of the second heat exchange 22 is input into the coil 24

In contrast to the winter heating, under the action of the energy lifting device 1, the output coil 25 of the second heat exchange unit 22 generates low-level energy, and the liquid return pump 7 outputs the energy of the second heat exchange unit 22 to the tray 25. The cooled antifreeze liquid enters the energy output coil 17 of the first heat exchange device 2 through the first interface 14a and the second interface 14b of the second two-position four-way valve 14 to release cold energy to the energy input coil of the radiator 3. 6. After the warming liquid is discharged from the energy output coil 17 of the first heat exchange device 2, the third interface 13c and the fourth interface 13d of the first two-position four-way valve 13 enter the second heat exchange device 22. The energy output coil 25 absorbs cold energy, and the energy of the radiator 3 into the coil 6 is coupled with the energy output coil 17 of the first heat exchange device 2, and the heat sink 3 is output from the energy output coil of the first heat exchange device 2. The cold energy is continuously obtained in 17 and is supplied to the heat sink 21 (i.e., the user) by the circulation pump 9. This is repeated to achieve the purpose of cooling.

Similarly, in order to make rational use of energy, an AL compressor or two compressors can be appropriately selected to work with one compressor when the weather is not too hot in summer, and two pressure washers when the weather is hot, and With a variable speed compressor, the amount of cooling provided by the energy boosting device is increased or decreased by increasing or decreasing the speed of the compressor.

It can be seen from the running process that the energy lifting device 1 is a heat pump that changes the operating conditions to adapt to changes in outside temperature. It can provide different heating or cooling temperatures as needed, and is flexible and versatile. Its two circuit compressors can be selected from the same compressor or different compression fL, and the optimal configuration can be selected according to different needs. Industrial applicability.

The heat pump system for extracting water energy of the invention can directly collect energy of rivers, rivers, lakes, seas or groundwaters, and is not subject to environmental conditions, and supplies heating to residents, enterprises and institutions in winter, and supplies heat in summer, daily supply of domestic hot water .

Claims

A heat pump system for extracting water energy, which comprises: a water energy collecting device (4), an energy lifting device (1) and a radiator (3) connected in series, the water collecting device (4) comprising The submersible pump (23), the low energy side heat exchange coil (5) and the heat collecting well (20) installed in the heat collecting well (20) are sequentially connected in series, and the energy lifting device (1) comprises: a circuit consisting of an evaporator (18), a compressor, a condenser (19) and an expansion valve (15) in series, the radiator (3) comprising: an energy input coil (6), a circulation pump (9) And a plurality of heat sinks (21) are sequentially connected in series, characterized in that: a first heat exchange device (2) is arranged between the energy lifting device (1) and the heat sink (3), the first exchange The heat device (2) comprises: a reciprocatingly composed of a high-potential side heat exchange coil (16), an outlet pump (8) and an energy output coil (17), the condenser (19) and the High energy side heat exchange coil

(16) phase coupled, the energy input coil (6) of the heat sink (3) and the energy output coil (17) of the first heat exchange device (2) are coupled to the energy boosting device ( 1) A second heat exchange device (22) is disposed between the water energy harvesting device (4), and the second heat exchange device (22) comprises: an energy input coil (24), an energy output coil (25) And the liquid return pump (7) is sequentially connected in series, and the energy input coil (24) of the second heat exchange device (22) is coupled with the low energy side heat exchange coil (5), The energy output coil (25) of the two heat exchange device (22) is coupled with the evaporator (18), and the liquid flowing in the circuit of the first heat exchange device (2) and the second heat exchange device (22) is antifreeze The compressor is composed of a first compressor (11) and a second compressor (12) which are connected in parallel with each other.

2. The heat pump system for extracting water energy according to claim 1, wherein: the heat pump system for extracting water energy further comprises: a first two-position four-way reversing valve (13) and a second two-position four-way a reversing valve (14), wherein the first interface (13a) of the first two-position four-way reversing valve (13) is connected to the liquid outlet end of the energy input coil (24) of the second heat exchange device (22), The second interface (13b) of the two-position four-way reversing valve (13) is connected to the liquid inlet end of the high-frequency side heat exchange coil (16) of the first heat exchange device (2), and the first two-position four-way exchange The third interface (13c) of the valve (13) is connected to the liquid outlet of the energy output coil (17) of the first heat exchange device (2), and the fourth interface of the first two-position four-way selector valve (13) (13d) is connected to the liquid inlet end of the energy output coil (25) of the second heat exchange device (22); the first interface ( _{14a) of the} second two-position four-way selector valve (14 ₎ and the second heat exchange The liquid discharge end of the liquid return pump (7) of the device (22) is connected, the second interface (14b) of the second two-position four-way switching valve (14) and the volume output coil of the first heat exchange device (2) (17) The liquid inlet ends are connected, and the second two bits are changed. The third port (14c) of the valve (14) is connected to the liquid outlet of the outlet pump (8) of the first heat exchange device (2), and the fourth port of the second two-position four-way selector valve (14) ( 14d) is connected to the liquid inlet end of the energy input coil (24) of the second heat exchange device (22).

3. The water pumping system for extracting water energy according to claim 2, wherein: said first compressor (11) and said second compressor (12) are adjustable speed compressors.

The heat pump system for extracting water level according to claim 2 or 3, characterized in that: heating of the water heater in series between the first and second compressors (11, 12) and the condenser (19) Tube (10).

5. The heat pump system for extracting water energy according to claim 4, wherein: the low energy side heat exchange coil (5) of the water energy collecting device (4) and the second heat exchange device coupled thereto ( 22) The volume input coil (24) is made into a plate heat exchanger, and the energy output coil (25) of the second heat exchange device (22) and the evaporator (18) coupled thereto are made into a brazed plate type. a heat exchanger, the condenser (19) and the high-energy side heat exchange coil (16) of the first heat exchange device (2) coupled thereto are formed into a brazed plate heat exchanger, the first heat exchange A plate heat exchanger is formed by the energy input coil (6) of the device (2) carrying the 3⁄4 volume output coil (17) and the heat sink (3) coupled thereto.

6. The heat pump system for extracting water energy according to claim 5, wherein: the water is water or groundwater of rivers and lakes.