WO2006045227A1

WO2006045227A1 - A ground source heat pump system

Info

Publication number: WO2006045227A1
Application number: PCT/CN2004/001270
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: CN1769817A; CN1306233C

Abstract

A ground source heat pump system includes a geothermal energy collecting equipment, an energy exalting equipment and a radiator connected in series. The geothermal energy collecting equipment includes a circuit of a heat collector, a low-grade heat exchanger coil and a pump 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 a energy inputting coil, a pump and several radiation fin in series. A heat exchanger equipment is provided between the energy exalting equipment and the radiator. The fluid inside the geothermal energy collecting equipment and the heat exchanger equipment is antifreeze. The system of the invention has a simple structure, which is easily to install and maintain, and can work normally in any case.

Description

Heat pump system for extracting soil energy

The invention relates to a heat pump system for extracting soil energy, in particular to a heat pump system suitable for extracting soil energy in various environments, which is to convert low-grade heat energy into high-grade heat energy to achieve winter heating by a g-volume lifting device. , summer cooling, daily supply of hot 7K. Background technique

The vertical geothermal energy storage j|system of the Chinese invention patent No. ZL01116085.3 previously filed by the applicant of the present invention provides an air conditioning system using geothermal heat as a source, pollution-free, and small footprint, but When the system is at a low ambient temperature, the heating requirements are often not met, and sometimes the evaporator freezes, causing the heating to be interrupted, making the system not widely available and widely used. Summary of the invention

In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a heat pump system for extracting soil energy, which can make the heat pump system for extracting soil energy work normally under any circumstances to achieve winter heating and summer co-cooling. the goal of.

In order to achieve the object of the present invention, the heat pump system for extracting soil energy of the present invention comprises: a soil energy harvesting device, an energy lifting device and a heat sink which are sequentially connected in series, the soil energy harvesting device comprising: a collector, a low energy The side heat exchange coil and the liquid return pump 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 low energy side heat exchange coil and The evaporator is coupled, and the heat sink comprises: a circuit consisting of an energy input coil, a circulation pump and a plurality of heat sinks in series, wherein: a switch is arranged between the energy lifting device and the heat sink The heat device and the heat exchange device comprise: a circuit consisting of a high-energy side 3 heat coil, an outlet pump and an energy output coil in series, wherein the condenser is coupled with the high-potential side heat exchange tube: The energy output coil is coupled to the energy input coil, and the liquid flowing in the circuit of the soil energy collecting device and the heat exchange device is an antifreeze solution. Parallel with the first compressor and the second compressor unit into pressure ¾1.

The heat pump system for extracting soil energy of the present invention, wherein: the heat pump system further comprises: a first two-position four-way valve and a second two-position four-way reversing valve, wherein the first two-position four-way reversing valve is first The interface is connected to the liquid discharge end of the collector, and the second interface of the first two-position four-way reversing valve is connected with the liquid inlet end of the high-energy side heat exchange coil of the heat exchange device, and the first two vertical four-way reversing The third interface of the valve is connected to the liquid outlet end of the energy output coil of the heat exchange device, and the first two-position four-way reversing valve is connected to the liquid inlet end of the low energy side heat exchange coil of the soil energy collecting device. The first interface of the second two-position four-way reversing valve Connected with the liquid returning end of the soil energy collecting device, the second interface of the second two-way four-way reversing is connected with the liquid feeding end of the heat exchange device, the second two The third port of the reversing valve is connected to the liquid outlet end of the heat exchange device, and the fourth port of the second two-way four-way reversing valve is connected to the liquid inlet end of the collector.

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

The heat pump system for extracting soil energy of the present invention, wherein: the first and second compressors and the condenser are connected to a heating pipe of the water heater.

The heat pump system for extracting soil energy of the present invention, wherein: the low energy side heat exchange coil of the soil energy harvesting device and the evaporator of the energy boosting device coupled thereto are made into a brazed plate heat exchanger, and the energy is raised A cold plate heat exchanger of the device and a high energy side heat exchange coil of the heat exchange device coupled thereto are formed into a brazed plate heat exchanger, and an energy output coil of the heat exchange device and an energy input disk of the heat sink coupled thereto The tube is made into a plate heat exchanger.

The heat pump system for extracting soil energy according to the present invention, wherein: the heat collector is composed of an outer cylinder, an inner cylinder, an upper cover and a flow equaling plate which are set in the outer cylinder, and a gap is left between the outer cylinder and the inner cylinder. The upper cover is located at the top of the outer cylinder, and the liquid inlet pipe of the collector is mounted on the upper cover, and the liquid outlet pipe of the heat collector communicates with the lower part of the annular space between the outer cylinder and the inner cylinder, and the upper cover A flow equalization plate is disposed between the inner cylinder and the inner cylinder, and the inner cylinder is an open container, and the opening of the inner cylinder extends from the upper cover of the outer cylinder.

The heat pump system for extracting soil energy of the present invention has the advantage of prior art compared with the prior art vertical geothermal energy storage air conditioning system:

1. Since the heat exchanger is added to the system of the present invention, the liquid flowing in the heat exchanger circuit and the soil energy collecting device circuit is an antifreeze liquid, and the liquid flowing in the energy lifting device circuit is a refrigerant, so even if the system is at a low temperature I work, the evaporator and the condenser will not freeze, block and scale, so as to ensure the heat pump system to extract the soil energy, and in order to use the energy reasonably, the parallel structure of the compressor is adopted in the present invention. Use one compressor when the weather is not cold in winter, and use two compressors when the weather is cold.

2. Two 2/2-way reversing valves are installed on the heat pump system for extracting soil energy, and heating or cooling is performed by changing the position of the 4/2-way reversing valve.

3. The heat pump system of the present invention uses a variable speed compressor to increase or decrease the speed of the compressor, so that the amount of heat supplied by the energy rushing device is increased or decreased, so that the energy can be used most rationally.

4. The heat pump system of the present invention has a heating pipe of a water heater connected in series between the compressor and the condenser to supply hot water for daily life.

5. The condenser and the heat exchange device coupled to it are controlled by the high-energy side heat exchange plate as a brazed plate heat exchanger, and the energy output coil of the replacement device and the energy input disk of the coupled heat sink are controlled. Into a detachable plate heat exchanger, the liquid flowing in the closed circuit of the changing device is an antifreeze liquid; the evaporator and the coupled energy energy collecting device of the low energy side of the device are controlled into a brazed plate heat exchanger. The liquid flowing in the closed loop of the soil concentration collecting device is also antifreeze, The non-removability, clogging and freezing of the brazed plate heat exchanger limit its widespread use. The present invention allows the inner side of the two brazed plate heat exchanger to flow the refrigerant, and the outer side squirts the antifreeze liquid, thus fully exerting The strength of the brazed plate heat exchanger avoids the shortcomings, which not only improves the heat exchange efficiency but also increases the service life of the brazed plate heat exchanger. DRAWINGS

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

Refer to Figure 1. The heat pump system for extracting soil energy shown in FIG. 1 comprises: a soil energy harvesting device 4, an energy lifting device 1, a heat exchange device 2 and a radiator 3, which are sequentially connected in series, and the soil energy collecting device 4 comprises: a collector 20 The low energy side heat exchange coil 5 and the liquid return pump 7 are sequentially connected in series, and the energy lifting connection 1 comprises: an evaporator 18, a compressor, a water heater, a heat pipe 10, a condenser 19 and an expansion valve 15 in sequence. The heat exchange device 2 comprises: a loop composed of a high-potential side heat exchange coil 16, an outlet pump 8 and an energy output coil 17 in series, and the radiator 3 comprises: an energy input coil 6 The circulation pump 9 and the plurality of fins 21 are sequentially connected in series, wherein the low energy side heat exchange coil 5 in the soil energy harvesting device 4 is coupled to the evaporator 18 of the energy lifting device 1, and the condensation in the energy lifting device 1 The device 19 is coupled to the high energy side heat exchange coil 16 in the heat exchange device 2, and the energy output coil 17 in the heat exchange device 2 is coupled to the energy input coil 6 of the heat sink 3, The liquid flowing in the circuit of the collecting device 4 circuit and the heat exchange device 2 is an antifreeze liquid, and the JE reducing machine in the energy lifting device 1 comprises: a first compressor 11 and a second IE contracting machine 12 which are adjustable in speed, which are connected in parallel with energy In the circuit of the lifting device 1. A heating pipe 10 of the water heater is connected in series between the two compressors 11, 12 and the condenser 19 to provide daily hot water for daily use.

The heat pump system for extracting soil energy further includes: a first two-position four-way reversing valve 13 and a second two-position four-way reversing valve 14, and the winter heating or summer cooling is achieved by changing the position of the four-position four-way reversing. The first interface 13a of the first two-position EI-way switching valve 13 is connected to the liquid-out end of the heat collector 20, the second interface 13b of the first two-position four-way switching valve 13 and the high energy side of the heat exchange device 2 The liquid inlet end of the heat exchange coil 16 is connected, and the first two-position four-way switching valve 13 is connected to the liquid outlet end of the energy output coil 17 of the heat exchange device 2, and the first two-position four-way reversing valve The fourth interface 13d of 13 is connected to the liquid inlet end of the low energy side heat exchange coil 5 of the soil energy collecting device 4; the first interface 14a of the second two-position four-way valve 14 and the soil energy collecting device 4 liquid return pump The liquid discharge end of the second two-position four-way valve 14 is connected to the liquid inlet end of the energy output coil 17 of the heat exchange device 2, and the second two-position four-way switch is the third one of the 14 14 The interface 14c is connected to the liquid discharge end of the discharge pump 8 of the heat exchange device 2, and the fourth port 14d of the second two-position four-way switching valve 14 is connected to the liquid inlet end of the heat collector 20.

The low energy side heat exchange coil 5 of the soil energy harvesting device 4 and the evaporator 18 of the energy boosting device 1 coupled thereto are formed into a brazed plate heat exchanger, the condenser 19 of the energy lifting device 1 and the heat exchange coupled therewith High energy of device 2 The side heat exchange coil 16 is made into a brazed plate heat exchanger, and the energy output coil 17 of the 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 heat collector 20 is composed of an inner cylinder 23, an upper cover 24 and a flow equalizing plate 25 which are housed in the outer cylinder 22 by the outer cylinder 22, 3⁄4, and a gap is left between the outer cylinder 22 and the inner cylinder 23, and the top of the outer cylinder 22 An upper cover 24 is provided, and the liquid inlet pipe of the heat collector 20 is mounted on the upper cover 24, and the liquid discharge pipe of the heat collector 20 communicates with the lower portion of the annular space between the outer cylinder 22 and the inner cylinder 23, and is sealed. A flow equalizing plate 25 is disposed between the cover 24 and the inner cylinder 23, the inner cylinder 23 is an open type container, and the opening of the inner cylinder 23 is extended from the upper cover 24 of the outer cylinder 22. The collector 20 is placed in the heat collecting well, and a mixture of cement and clay is filled between the outer cylinder 22 of the collector and the wall of the well, and the ratio of cement to clay is between 1:3 and 1:5.

Due to the use of brazed plate heat exchangers, the volume of the system is greatly reduced. At the same time, the system components and the power distribution panel outside the heat collector and the heat sink can be made into an integrated component, which eliminates the on-site installation and truly installs the factory on site, which saves the cost and ensures the engineering quality.

The working principle of the heat pump system for extracting soil energy of the present invention;

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

Figure 1 is a schematic illustration of a heat pump system for extracting soil energy. In the winter heating state, the spool position of the first two-position four-way selector valve 13 and the second two-position four-way selector valve 14 is as shown in the figure, perpendicular to the 0-spoon pipe connected thereto, at this time, the first 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 corresponding to the t, and the second interface b is respectively corresponding to the third of the gums. Interface c is connected.

The liquid return pump 7 is activated, and the liquid return pump 7 draws the antifreeze liquid of the low energy side heat exchange coil 5, and the Dongdong liquid flows into the heat collecting unit through the first interface 14a and the fourth interface 14d of the second two-position four-way switching valve 14. In the device 20, the antifreeze liquid flows uniformly along the annular passage formed between the inner tube 23 and the outer tube 22 of the heat collector 20 through the equalizing plate 25 to the bottom of the heatless unit 20, and is cooled after the temperature is lowered in the process. The liquid absorbs the heat from the outer wall of the outer cylinder 22 of the shaped passage to the outer wall, absorbs the heat of the water in the inner cylinder 23 from the inner wall of the annular passage, and the first antifreeze passes through the first two-position four-way reversing valve 13 The interface 13a and the fourth interface 13d enter the lower energy side heat exchange coil 5 again to release heat.

The working fluid in the evaporator 18 of the energy lifting device 1 absorbs energy flowing through the low energy side heat exchange coil 5 of the soil energy collecting device 4 to evaporate into a gas, and the gas is compressed by the first compressor 11 and/or the second compressor 12 Heating up (depending on the outside air 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 heating pipe 10 of the water heater for the people to wash, and then releasing the heat through the condenser 19 to the high-energy side heat exchange coil 16 coupled with the condenser 19, and the condensed liquid working medium is expanded. After the valve 15 is depressurized, it again enters the evaporator 18 to absorb heat... thus repeating the cycle.

The temperature-increasing antifreeze liquid is sent to the energy output coil 17 of the first heat exchange device 2 through the third port 14c and the second port 14b of the second two-position four-way switching valve 14 to release heat, and the temperature is lowered. After the frozen liquid passes the first two The third port 13c and the second port 13b of the four-way switching valve 13 flow into the high-energy side heat exchange coil 16 of the heat exchange bedding 2 to absorb heat, and the cycle is repeated, and the heat is continuously supplied to the heat exchanger 2 The energy output of the heat sink 3 coupled to the volume output coil 17 is input to the coil 6, and the heat is continuously supplied to the heat sink 21 (i.e., the user) through the circulation pump 9, thereby achieving the purpose of heating.

(2) The heat pump system for extracting soil energy of the present invention is cooled in summer 吋 0 J working process

In this state, the first two-position four-way reversing valve 13 and the second two-position four-way valve spool are in parallel with the pipe position connected thereto, that is, the spool of the reversing valve is in the The position is perpendicular to the position, at which time the first interface a of the first two-position four-way switching valve 13 and the second two-position four-way switching valve 14 are respectively connected with their corresponding second interfaces b, the third interface c is respectively connected to their corresponding fourth interface d.

The antifreeze liquid in the heat collector 20 enters the high energy side heat exchange coil 16 of the heat exchange device 2 through the first interface 13a and the second interface 13b of the first two-position four-way valve 13 by the discharge pump 8. The heat released from the condenser 19 is absorbed, and the warmed antifreeze liquid is returned to the heat collector 20 through the third interface 14c of the second two-position four-way valve 14 and the fourth interface 14d.

In contrast to the winter heating, under the action of the energy boosting device 1, the low energy can be {the heat exchange coil 5 releases heat to the evaporator 18, and the liquid return pump 7 cools the low temperature side heat exchange coil 5 after the freezing night. The energy output disk 17 entering the heat exchange device 2 through the first interface 14a and the second interface 14b of the second two-position four-way valve 14 releases cold energy, and the energy of the heat sink 3 is input to the coil 6 for the user to cool. After the warmed antifreeze liquid emerges from the energy output coil 17 of the heat exchange device 2, the third interface 13c and the fourth interface 13d of the first two-position four-way wide 13 are absorbed into the lower energy side heat exchange coil 5 Cold energy, and the energy input coil 6 of the radiator 3 is coupled to the energy transmission tS coil 17 of the heat exchange device 2, and the energy input coil 6 of the radiator 3 is continuously supplied from the energy output coil 17 of the heat exchange device 2. The lj cold energy is supplied to the heat sink 21 (i.e., the user) by the circulation pump 9. This cycle is repeated to achieve the purpose of cooling.

In the same way, in order to make rational use of energy, one compressor or two compressors can be appropriately selected. When the weather is not too hot in summer, one compressor is used. When the weather is hot, two compressors are used. The variable speed compressor can increase or decrease the speed of the compressor, so that the energy boosting device can increase or decrease the cooling capacity.

As can be seen from the running process, 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, maneuverable, flexible and versatile. The compressors of its two circuits can be selected from the same compressor or different compressors, and the optimal configuration can be selected according to different needs. Industrial applicability

The heat pump system for extracting soil energy of the invention can directly collect the amount of soil in the soil, and is not subject to environmental conditions, heating to residents, enterprises and institutions in winter, cooling in summer, and daily supply of living water.

Claims

A heat pump system for extracting soil energy, comprising: a soil energy collecting device (4), an energy lifting device (1) and a radiator (3) connected in series, the soil energy collecting device (4) comprising : a circuit consisting of a collector (20), a low energy side heat exchange coil (5) and a liquid return pump (7) in series, the energy boosting device (1> comprising: by the evaporator (18), compression a compressor, a condenser (19) and an expansion valve (15) are sequentially connected in series, the low energy side heat exchange coil (5) is coupled to the evaporator (18), and the radiator (3) comprises a circuit consisting of an energy input coil (6), a circulation pump (9) and a plurality of fins (21) connected in series, characterized in that: the energy lifting device (1) and the radiator (3) There is a heat exchange device (2), and the heat exchange device (2) comprises: a circuit consisting of a high-potential side heat exchange coil (16), an outlet pump (8) and an energy output coil (17) in series. The condenser (19) is coupled to the clamping energy side heat exchange coil (16), the energy An output coil (17) is coupled to the energy input coil (16), and the liquid flowing in the loop of the soil collecting device (4) and the heat exchange device (2) is an antifreeze liquid, the compressor It consists 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 soil amount according to claim 1, wherein: the heat pump system further comprises: a first two-position four-way reversing valve (13) and a second two-position four-way reversing valve (14), where the first two four-way reversing valve

The first interface (13a) of (13) is connected to the liquid outlet of the collector (20), and the second interface (13b) of the first two-position four-way switching valve (13) is high with the heat exchange device (2) The liquid inlet end of the energy side heat exchange coil (16) is connected, the third interface (13c) of the first two-position four-way switching valve (13) and the heat output device (2) of the energy output coil (17) The liquid end is connected, the fourth interface (13d) of the first two-position four-way switching valve (13) is connected to the liquid inlet end of the low energy side heat exchange coil (5) of the ±: soil energy collecting device (4); The first interface (14a) of the second two-position four-way reversing valve (14) is connected to the liquid discharge end of the soil energy harvesting device (4), and the second two-way four-way reversing valve (14) The second interface (14b) is connected to the liquid inlet end of the heat output device (2) energy output coil (17), and the third interface (14c) of the second two-position four-way switching valve (14) is exchanged The discharge port of the discharge pump (8) of the device (2) is connected, and the fourth port (14d) of the second two-position four-way selector valve (14) is connected to the liquid inlet of the collector (20).

A heat pump system for extracting soil amount according to claim 2, wherein said first compressor (11) and said second compressor (12) are adjustable speed compressors.

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

5. The heat pump system for extracting soil energy according to claim 4, wherein: the low energy side heat exchange coil (5) of the soil energy harvesting device (4) and the energy boosting device coupled thereto (1) The evaporator (18) is made into a brazed plate heat exchanger, the condenser (19) of the energy lifting device (1) and the heat exchange device coupled thereto (2) The high energy side heat exchange coil (16) is made into a brazed plate heat exchanger, the energy output coil (17) of the heat exchange device (2) and the energy input coil of the heat sink (3) coupled thereto (6) A plate heat exchanger is produced.

6. The heat pump system for extracting soil energy according to claim 5, wherein: the collector (20) is provided by an outer cylinder (22) and an inner cylinder (23) fitted in the outer casing (22). The cover (24) and the flow equalization plate (25) are formed with a gap between the outer cylinder (22) and the inner cylinder (23), and the upper cover (24) is located at the top of the outer cylinder (22), collecting heat The inlet pipe of the device (20) is mounted on the upper cover (24), and the outlet pipe of the collector (20) communicates with the lower portion of the annular space between the outer cylinder (22) and the inner cylinder (23). A flow equalizing plate (25) is arranged between the cover (24) and the inner cylinder (23), the inner cylinder (23) is an open container, and the opening of the inner cylinder (23) protrudes from the upper cover of the outer cylinder (22) ( twenty four).