CN112629074A - Shallow geothermal ground source heat pump system and method based on middle-deep geothermal energy - Google Patents
Shallow geothermal ground source heat pump system and method based on middle-deep geothermal energy Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T2010/50—Component parts, details or accessories
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A shallow geothermal ground source heat pump system and a method based on the geothermal of a middle-deep layer are characterized in that a coaxial sleeve heat exchanger and a heat pump are connected through a water inlet pipe and a water outlet pipe, a first shallow heat exchanger and a second shallow heat exchanger are respectively connected with the water inlet pipe and the water outlet pipe in parallel, a ground surface heat exchanger is connected with the first shallow heat exchanger and the second shallow heat exchanger in parallel, the lower portion of the coaxial sleeve heat exchanger is located at the middle-deep layer of a geothermal ground source, the upper portion of the coaxial sleeve heat exchanger is located at the ground shallow layer, and the first shallow heat exchanger, the second shallow heat exchanger, the coaxial sleeve heat exchanger, the heat pump and the ground surface. The invention overcomes the problems that the original middle-deep geothermal heat cannot be continuously developed and the shallow geothermal heat cannot be effectively utilized due to too fast attenuation, and has the characteristics of simple structure, utilization of the middle-deep geothermal heat to heat the shallow geothermal heat for early stage heating in winter, later stage heating in winter to absorb the shallow geothermal heat so as to facilitate cooling and refrigeration of a heat pump in summer, and high comprehensive utilization efficiency.
Description
Technical Field
The invention belongs to the technical field of geothermy, and relates to a shallow geothermal ground source heat pump system and a method based on middle-deep geothermal heat.
Background
At present, two common technologies are used for developing geothermal energy for heating in winter: shallow geothermal source heat pump technology; the heat supply technology for directly exploiting the geothermal water in the middle and deep layers. However, both of these techniques have certain drawbacks to be solved.
Shallow ground source heat pump technology: the shallow geothermal well occupies a large area and is limited in application; the cold and hot load in winter and summer is unbalanced, and the energy efficiency of the system is seriously attenuated.
The heat supply technology for directly exploiting the geothermal water at the middle and deep layers comprises the following steps: only areas with abundant underground hot water resources can be used, and the application is limited; the underground hot water is directly exploited, the recharge difficulty is high, the waste and pollution of underground water resources are caused, the underground water is pumped for a long time, the risks of geological structure collapse and the like exist, and the method is an energy utilization mode which can not be continuously developed. Currently, government authorities at all levels have begun to prohibit the exploitation of hot underground water for winter heating.
The heat of the intermediate-deep geothermal heat is abundant and has the characteristic of difficult attenuation, and the shallow geothermal heat is usually extremely fast in the practical application.
Disclosure of Invention
The invention aims to solve the technical problem of providing a shallow geothermal ground source heat pump system and a method based on middle-deep geothermal energy, the structure is simple, a water inlet pipe and a water outlet pipe are adopted to connect a coaxial sleeve heat exchanger and a heat pump, a first shallow heat exchanger and a second shallow heat exchanger are respectively connected with the water inlet pipe and the water outlet pipe in parallel, a ground surface heat exchanger is connected with the first shallow heat exchanger and the second shallow heat exchanger in parallel, the lower part of the coaxial sleeve heat exchanger is positioned at the middle-deep layer of a geothermal ground source, the upper part of the coaxial sleeve heat exchanger is positioned at the shallow layer of the ground, the first shallow heat exchanger, the second shallow heat exchanger, the coaxial sleeve heat exchanger, the heat pump and the ground surface heat exchanger are switched on and off and connected by pipelines, the middle-deep geothermal energy is used for heating the shallow geothermal energy in the early stage of winter.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a shallow geothermal ground source heat pump system based on middle-deep geothermal comprises a first shallow heat exchanger, a second shallow heat exchanger, a coaxial sleeve heat exchanger, a heat pump and a ground surface heat exchanger; the coaxial double-pipe heat exchanger and the heat pump are connected through a water inlet pipe and a water outlet pipe, the first shallow heat exchanger and the second shallow heat exchanger are respectively connected with the water inlet pipe and the water outlet pipe in parallel, and the ground surface heat exchanger is connected with the first shallow heat exchanger and the second shallow heat exchanger in parallel; and the outer edge of the upper part of the coaxial double-pipe heat exchanger is provided with a heat insulation layer.
And the water inlet pipe and the water outlet pipe are respectively provided with a water inlet valve and a water outlet valve.
The water outlet pipe is provided with a first circulating pump, and the first circulating pump is positioned between the heat pump and the water outlet valve.
And a first group of water inlet and outlet valves are respectively arranged on the water inlet pipe and the water outlet pipe of the first shallow heat exchanger.
And a second group of water inlet and outlet valves are respectively arranged on the water inlet pipe and the water outlet pipe of the second shallow heat exchanger.
And a third group of water inlet and outlet valves are respectively arranged on the water inlet and outlet pipes connected between the surface heat exchanger and the first shallow heat exchanger.
And a fourth group of water inlet and outlet valves are respectively arranged on the water inlet and outlet pipes connected between the surface heat exchanger and the second shallow heat exchanger.
And the water outlet pipes of the first shallow heat exchanger and the second shallow heat exchanger are connected with a second circulating pump, and the second circulating pump is connected with the surface heat exchanger.
The use method of the shallow geothermal ground source heat pump system based on the intermediate geothermal energy comprises the following steps:
s1, mounting, wherein the lower part of the coaxial double pipe heat exchanger is positioned at the middle deep layer of a geothermal ground source, and the heat insulation layer at the upper part of the coaxial double pipe heat exchanger is positioned at the shallow layer of the ground;
s2, in autumn, closing the heat pump, sequentially opening a first group of water inlet and outlet valves, a second group of water inlet and outlet valves, a water inlet valve, a water outlet valve and a first circulating pump, leading the middle-deep-layer geothermal heat into a first shallow heat exchanger and a second shallow heat exchanger by the coaxial double-pipe heat exchanger, and heating the ground shallow layer by the first shallow heat exchanger and the second shallow heat exchanger for use in winter;
s3, closing the water inlet valve and the water outlet valve in the early stage of winter, sequentially opening the heat pump, the first group of water inlet and outlet valves and the second group of water inlet and outlet valves, heating by the heat pump to supply heat to the outside, and exchanging heat by the first shallow heat exchanger and the second shallow heat exchanger;
s4, closing the first group of water inlet and outlet valves and the second group of water inlet and outlet valves at the later stage of winter, and opening the water inlet valve, the water outlet valve, the first circulating pump, the third group of water inlet and outlet valves, the fourth group of water inlet and outlet valves and the second circulating pump in sequence, wherein the coaxial double-pipe heat exchanger carries the ground heat at the middle-deep layer to the heat pump for heating, and the ground heat exchanger carries the low temperature at the ground surface to the first shallow heat exchanger and the second shallow heat exchanger for cooling the ground shallow layer;
s5, closing the whole system in spring;
s6, in summer, closing the water inlet valve, the water outlet valve, the first circulating pump, the second circulating pump, the third group of water inlet and outlet valves and the fourth group of water inlet and outlet valves in sequence, opening the first group of water inlet and outlet valves, the second group of water inlet and outlet valves and the heat pump in sequence, and enabling the first shallow heat exchanger and the second shallow heat exchanger to be matched with the heat pump for refrigeration.
A shallow geothermal ground source heat pump system based on middle-deep geothermal comprises a first shallow heat exchanger, a second shallow heat exchanger, a coaxial sleeve heat exchanger, a heat pump and a ground surface heat exchanger; the coaxial double-pipe heat exchanger and the heat pump are connected through a water inlet pipe and a water outlet pipe, the first shallow heat exchanger and the second shallow heat exchanger are respectively connected with the water inlet pipe and the water outlet pipe in parallel, and the ground surface heat exchanger is connected with the first shallow heat exchanger and the second shallow heat exchanger in parallel; and the outer edge of the upper part of the coaxial double-pipe heat exchanger is provided with a heat insulation layer. Simple structure, through inlet tube and play water piping connection coaxial double-pipe heat exchanger and heat pump, first shallow heat exchanger, the second shallow heat exchanger is parallelly connected with inlet tube and outlet pipe respectively, the earth's surface heat exchanger is parallelly connected with first shallow heat exchanger and second shallow heat exchanger, the lower part through coaxial double-pipe heat exchanger is located the middle and deep layer of geothermal ground source, upper portion is located the earth shallow layer, carry out switching and the pipeline of connecting to first shallow heat exchanger, second shallow heat exchanger, coaxial double-pipe heat exchanger, heat pump and earth's surface heat exchanger, utilize middle and deep floor geothermol power to heat the shallow geothermal heating and be used for heating earlier stage in winter, later stage heating absorbs the heat pump cooling refrigeration of summer of being convenient for of shallow geothermol power in winter, comprehensive utilization.
In the preferred scheme, a water inlet valve and a water outlet valve are respectively arranged on the water inlet pipe and the water outlet pipe. The coaxial sleeve heat exchanger is simple in structure, and when the coaxial sleeve heat exchanger is used, a water inlet valve and a water outlet valve on the water inlet pipe and the water outlet pipe are opened to form a loop with the coaxial sleeve heat exchanger and the heat pump.
In the preferred scheme, a first circulating pump is arranged on the water outlet pipe and is positioned between the heat pump and the water outlet valve. The structure is simple, and when the heat pump is used, after the first circulating pump is started, a loop between the coaxial double-pipe heat exchanger and the heat pump forms a circulating loop.
In a preferred scheme, a first group of water inlet and outlet valves are respectively arranged on a water inlet pipe and a water outlet pipe of the first shallow heat exchanger. The structure is simple, and when the heat pump is closed and the first group of water inlet and outlet valves are opened during use, a loop is formed between the first shallow heat exchanger and the coaxial sleeve heat exchanger.
In a preferred scheme, a second group of water inlet and outlet valves are respectively arranged on a water inlet pipe and a water outlet pipe of the second shallow heat exchanger. The structure is simple, and when the heat pump is closed and the second group of water inlet and outlet valves are opened during use, a loop is formed between the second shallow heat exchanger and the coaxial sleeve heat exchanger.
In a preferred scheme, a third group of water inlet and outlet valves are respectively arranged on water inlet and outlet pipes connected between the surface heat exchanger and the first shallow heat exchanger. The structure is simple, and when the heat exchanger is used, a loop is formed between the first shallow heat exchanger and the surface heat exchanger after the first group of water inlet and outlet valves are closed and the third group of water inlet and outlet valves are opened.
In a preferred scheme, a fourth group of water inlet and outlet valves are respectively arranged on water inlet and outlet pipes connected between the surface heat exchanger and the second shallow heat exchanger. The structure is simple, and when the heat exchanger is used, a loop is formed between the second shallow heat exchanger and the surface heat exchanger after the second group of water inlet and outlet valves are closed and the fourth group of water inlet and outlet valves are opened.
In an optimal scheme, water outlet pipes of the first superficial layer heat exchanger and the second superficial layer heat exchanger are connected with a second circulating pump, and the second circulating pump is connected with the surface heat exchanger. Simple structure, during the use, after No. two circulating pumps are opened, form circulation circuit between first shallow heat exchanger and the earth's surface heat exchanger, perhaps form circulation circuit between second shallow heat exchanger and the earth's surface heat exchanger.
In a preferred embodiment, the method for using the shallow geothermal ground source heat pump system based on the intermediate-deep geothermal heat comprises the following steps:
s1, mounting, wherein the lower part of the coaxial double pipe heat exchanger is positioned at the middle deep layer of a geothermal ground source, and the heat insulation layer at the upper part of the coaxial double pipe heat exchanger is positioned at the shallow layer of the ground;
s2, in autumn, closing the heat pump, sequentially opening a first group of water inlet and outlet valves, a second group of water inlet and outlet valves, a water inlet valve, a water outlet valve and a first circulating pump, leading the middle-deep-layer geothermal heat into a first shallow heat exchanger and a second shallow heat exchanger by the coaxial double-pipe heat exchanger, and heating the ground shallow layer by the first shallow heat exchanger and the second shallow heat exchanger for use in winter;
s3, closing the water inlet valve and the water outlet valve in the early stage of winter, sequentially opening the heat pump, the first group of water inlet and outlet valves and the second group of water inlet and outlet valves, heating by the heat pump to supply heat to the outside, and exchanging heat by the first shallow heat exchanger and the second shallow heat exchanger;
s4, closing the first group of water inlet and outlet valves and the second group of water inlet and outlet valves at the later stage of winter, and opening the water inlet valve, the water outlet valve, the first circulating pump, the third group of water inlet and outlet valves, the fourth group of water inlet and outlet valves and the second circulating pump in sequence, wherein the coaxial double-pipe heat exchanger carries the ground heat at the middle-deep layer to the heat pump for heating, and the ground heat exchanger carries the low temperature at the ground surface to the first shallow heat exchanger and the second shallow heat exchanger for cooling the ground shallow layer;
s5, closing the whole system in spring;
s6, in summer, closing the water inlet valve, the water outlet valve, the first circulating pump, the second circulating pump, the third group of water inlet and outlet valves and the fourth group of water inlet and outlet valves in sequence, opening the first group of water inlet and outlet valves, the second group of water inlet and outlet valves and the heat pump in sequence, and enabling the first shallow heat exchanger and the second shallow heat exchanger to be matched with the heat pump for refrigeration. The method utilizes the characteristics that the geothermal energy of the middle-deep layer is not easy to attenuate and the geothermal energy of the shallow layer is extremely fast to attenuate, combines the comprehensive utilization of the geothermal energy in each season, and has high utilization efficiency; the service time of the middle-deep geothermal heat is shortened, the geothermal heat recovery time of the middle-deep geothermal heat is prolonged, and the middle-deep geothermal heat recovery is facilitated; the middle-deep geothermal energy is utilized to heat the shallow geothermal energy, so that the heat reserve of the shallow geothermal energy is increased, and the shallow geothermal energy is conveniently utilized for heating in the early stage in winter; the low temperature characteristic of earth's surface is utilized to the later stage in winter, utilizes earth's surface heat exchanger to conduct the heat of shallow heat exchanger and then absorption big ground shallow layer with low temperature, utilizes the heat pump cooling refrigeration of being convenient for summer.
A shallow geothermal ground source heat pump system and a method based on the intermediate-deep geothermal energy comprise a first shallow heat exchanger, a second shallow heat exchanger, a coaxial sleeve heat exchanger, a heat pump and a ground surface heat exchanger, wherein the coaxial sleeve heat exchanger and the heat pump are connected through a water inlet pipe and a water outlet pipe, the first shallow heat exchanger and the second shallow heat exchanger are respectively connected with the water inlet pipe and the water outlet pipe in parallel, the ground surface heat exchanger is connected with the first shallow heat exchanger and the second shallow heat exchanger in parallel, the lower part of the coaxial sleeve heat exchanger is located in the intermediate-deep layer of a geothermal ground source, the upper part of the coaxial sleeve heat exchanger is located in the ground shallow layer, and the first shallow heat exchanger, the second shallow heat exchanger, the coaxial sleeve heat exchanger, the heat pump and the ground. The invention overcomes the problems that the original middle-deep geothermal heat cannot be continuously developed and the shallow geothermal heat cannot be effectively utilized due to too fast attenuation, and has the characteristics of simple structure, utilization of the middle-deep geothermal heat to heat the shallow geothermal heat for early stage heating in winter, later stage heating in winter to absorb the shallow geothermal heat so as to facilitate cooling and refrigeration of a heat pump in summer, and high comprehensive utilization efficiency.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a state diagram of the present invention.
In the figure: the system comprises a first shallow heat exchanger 1, a first group of water inlet and outlet valves 11, a second shallow heat exchanger 2, a second group of water inlet and outlet valves 21, a coaxial double-pipe heat exchanger 3, a water inlet pipe 31, a water outlet pipe 32, a heat insulation layer 33, a water inlet valve 34, a water outlet valve 35, a first circulating pump 36, a second circulating pump 37, a heat pump 4, a ground surface heat exchanger 5, a third group of water inlet and outlet valves 51 and a fourth group of water inlet and outlet valves 52.
Detailed Description
As shown in fig. 1 to 2, a shallow geothermal ground source heat pump system based on middle-deep geothermal heat comprises a first shallow heat exchanger 1, a second shallow heat exchanger 2, a coaxial double pipe heat exchanger 3, a heat pump 4 and a ground surface heat exchanger 5; the coaxial double-pipe heat exchanger 3 is connected with the heat pump 4 through a water inlet pipe 31 and a water outlet pipe 32, the first shallow heat exchanger 1 and the second shallow heat exchanger 2 are respectively connected with the water inlet pipe 31 and the water outlet pipe 32 in parallel, and the ground surface heat exchanger 5 is connected with the first shallow heat exchanger 1 and the second shallow heat exchanger 2 in parallel; and a heat insulation layer 33 is arranged on the outer edge of the upper part of the coaxial double-pipe heat exchanger 3. Simple structure, connect coaxial double-pipe heat exchanger 3 and heat pump 4 through inlet tube 31 and outlet pipe 32, first shallow heat exchanger 1, second shallow heat exchanger 2 is parallelly connected with inlet tube 31 and outlet pipe 32 respectively, earth's surface heat exchanger 5 is parallelly connected with first shallow heat exchanger 1 and second shallow heat exchanger 2, the lower part through coaxial double-pipe heat exchanger 3 is located the deep floor in geothermal ground source, upper portion is located the earth shallow, carry out switching of switching and the pipeline of connecting to first shallow heat exchanger 1, second shallow heat exchanger 2, coaxial double-pipe heat exchanger 3, heat pump 4 and earth's surface heat exchanger 5, utilize middle-deep geothermal to shallow geothermal heating to be used for heating earlier stage in winter, later stage heating absorbs the heat pump cooling refrigeration of being convenient for summer of shallow geothermal in winter, comprehensive utilization efficiency is high.
In a preferred scheme, a water inlet valve 34 and a water outlet valve 35 are respectively arranged on the water inlet pipe 31 and the water outlet pipe 32. The structure is simple, when in use, the water inlet valve 34 and the water outlet valve 35 on the water inlet pipe 31 and the water outlet pipe 32 are opened to form a loop with the coaxial double-pipe heat exchanger 3 and the heat pump 4.
In a preferred scheme, a first circulating pump 36 is arranged on the water outlet pipe 32, and the first circulating pump 36 is located between the heat pump 4 and the water outlet valve 35. The structure is simple, and when the first circulating pump 36 is started in use, a loop between the coaxial double-pipe heat exchanger 3 and the heat pump 4 forms a circulating loop.
In a preferred scheme, a first group of water inlet and outlet valves 11 are respectively arranged on the water inlet pipe and the water outlet pipe of the first shallow heat exchanger 1. The structure is simple, and when the heat pump is used, after the heat pump 4 is closed and the first group of water inlet and outlet valves 11 are opened, a loop is formed between the first shallow heat exchanger 1 and the coaxial double-pipe heat exchanger 3.
In a preferred scheme, a second group of water inlet and outlet valves 21 are respectively arranged on the water inlet pipe and the water outlet pipe of the second shallow heat exchanger 2. The structure is simple, and when the heat pump is used, after the heat pump 4 is closed and the second group of water inlet and outlet valves 21 are opened, a loop is formed between the second shallow heat exchanger 2 and the coaxial double-pipe heat exchanger 3.
In a preferred scheme, a third group of water inlet and outlet valves 51 are respectively arranged on water inlet and outlet pipes connected between the surface heat exchanger 5 and the first shallow heat exchanger 1. The structure is simple, and when the first group of water inlet and outlet valves 11 are closed and the third group of water inlet and outlet valves 51 are opened in use, a loop is formed between the first shallow heat exchanger 1 and the surface heat exchanger 5.
In a preferred scheme, a fourth group of water inlet and outlet valves 52 are respectively arranged on water inlet and outlet pipes connected between the surface heat exchanger 5 and the second shallow heat exchanger 2. The structure is simple, and when the device is used, after the second group of water inlet and outlet valves 21 are closed and the fourth group of water inlet and outlet valves 52 are opened, a loop is formed between the second shallow heat exchanger 2 and the surface heat exchanger 5.
In a preferable scheme, the water outlet pipes of the first superficial heat exchanger 1 and the second superficial heat exchanger 2 are connected with a second circulating pump 37, and the second circulating pump 37 is connected with the surface heat exchanger 5. Simple structure, during the use, after No. two circulating pumps 37 are opened, form circulation circuit between first shallow heat exchanger 1 and the earth's surface heat exchanger 5, perhaps form circulation circuit between second shallow heat exchanger 2 and the earth's surface heat exchanger 5.
In a preferred embodiment, the method for using the shallow geothermal ground source heat pump system based on the intermediate geothermal energy comprises the following steps:
s1, mounting, wherein the lower part of the coaxial double pipe heat exchanger 3 is positioned at the middle deep layer of a geothermal ground source, and the heat insulation layer 33 at the upper part of the coaxial double pipe heat exchanger 3 is positioned at the shallow layer of the ground;
s2, in autumn, closing the heat pump 4, sequentially opening the first group of water inlet and outlet valves 11, the second group of water inlet and outlet valves 21, the water inlet valve 34, the water outlet valve 35 and the first circulating pump 36, leading the middle-deep layer geothermal heat into the first shallow heat exchanger 1 and the second shallow heat exchanger 2 by the coaxial double-pipe heat exchanger 3, and heating the ground shallow layer by the first shallow heat exchanger 1 and the second shallow heat exchanger 2 for use in winter;
s3, closing the water inlet valve 34 and the water outlet valve 35 in the early stage of winter, sequentially opening the heat pump 4, the first group of water inlet and outlet valves 11 and the second group of water inlet and outlet valves 21, heating and supplying heat to the outside through the heat pump 4, and exchanging heat by the first shallow heat exchanger 1 and the second shallow heat exchanger 2;
s4, closing the first group of water inlet and outlet valves 11 and the second group of water inlet and outlet valves 21 at the later stage of winter, sequentially opening the water inlet valve 34, the water outlet valve 35, the first circulating pump 36, the third group of water inlet and outlet valves 51, the fourth group of water inlet and outlet valves 52 and the second circulating pump 37, carrying the ground heat at the middle and deep layer to the heat pump 4 by the coaxial double-pipe heat exchanger 3 for heating, carrying the low temperature at the ground surface to the first and second shallow heat exchangers 1 and 2 by the ground surface heat exchanger 5 for cooling the ground shallow layer;
s5, closing the whole system in spring;
s6, in summer, closing the water inlet valve 34, the water outlet valve 35, the first circulating pump 36, the second circulating pump 37, the third group of water inlet and outlet valves 51 and the fourth group of water inlet and outlet valves 52 in sequence, opening the first group of water inlet and outlet valves 11, the second group of water inlet and outlet valves 21 and the heat pump 4 in sequence, and matching the first shallow heat exchanger 1 and the second shallow heat exchanger 2 with the heat pump for refrigeration. The method utilizes the characteristics that the geothermal energy in the middle-deep layer is not easy to attenuate and the geothermal energy in the shallow layer is extremely fast to attenuate, combines the comprehensive utilization of the geothermal energy in all seasons, and has high utilization efficiency.
When the system and the method are installed and used, the water inlet pipe 31 and the water outlet pipe 32 are connected with the coaxial sleeve heat exchanger 3 and the heat pump 4, the first shallow heat exchanger 1 and the second shallow heat exchanger 2 are respectively connected with the water inlet pipe 31 and the water outlet pipe 32 in parallel, the ground surface heat exchanger 5 is connected with the first shallow heat exchanger 1 and the second shallow heat exchanger 2 in parallel, the lower part of the coaxial sleeve heat exchanger 3 is located at the middle-deep layer of the geothermal ground source, the upper part of the coaxial sleeve heat exchanger is located at the shallow ground layer, the first shallow heat exchanger 1, the second shallow heat exchanger 2, the coaxial sleeve heat exchanger 3, the heat pump 4 and the ground surface heat exchanger 5 are switched on and off and connected by pipelines, the middle-deep geothermal layer is used for heating the shallow geothermal heat source in the early stage of winter, the heating and absorption of the shallow geothermal heat pump are convenient for cooling and refrigerating.
In use, when the inlet valve 34 and the outlet valve 35 on the inlet pipe 31 and the outlet pipe 32 are opened, a loop is formed with the coaxial double-pipe heat exchanger 3 and the heat pump 4.
In use, when the first circulation pump 36 is turned on, the loop between the coaxial double pipe heat exchanger 3 and the heat pump 4 forms a circulation loop.
When the heat pump is used, after the heat pump 4 is closed and the first group of water inlet and outlet valves 11 are opened, a loop is formed between the first shallow heat exchanger 1 and the coaxial sleeve heat exchanger 3.
When the heat pump is used, after the heat pump 4 is closed and the second group of water inlet and outlet valves 21 are opened, a loop is formed between the second shallow heat exchanger 2 and the coaxial sleeve heat exchanger 3.
In use, when the first group of water inlet and outlet valves 11 are closed and the third group of water inlet and outlet valves 51 are opened, a loop is formed between the first shallow heat exchanger 1 and the surface heat exchanger 5.
In use, when the second group of water inlet and outlet valves 21 are closed and the fourth group of water inlet and outlet valves 52 are opened, a loop is formed between the second shallow heat exchanger 2 and the surface heat exchanger 5.
When the second circulating pump 37 is turned on, a circulating loop is formed between the first superficial heat exchanger 1 and the surface heat exchanger 5, or a circulating loop is formed between the second superficial heat exchanger 2 and the surface heat exchanger 5.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (9)
1. A shallow geothermal ground source heat pump system based on middle and deep geothermal is characterized in that: the heat pump system comprises a first shallow heat exchanger (1), a second shallow heat exchanger (2), a coaxial sleeve heat exchanger (3), a heat pump (4) and an earth surface heat exchanger (5); the coaxial double-pipe heat exchanger (3) is connected with the heat pump (4) through a water inlet pipe (31) and a water outlet pipe (32), the first shallow heat exchanger (1) and the second shallow heat exchanger (2) are respectively connected with the water inlet pipe (31) and the water outlet pipe (32) in parallel, and the ground surface heat exchanger (5) is connected with the first shallow heat exchanger (1) and the second shallow heat exchanger (2) in parallel; and a heat insulation layer (33) is arranged on the outer edge of the upper part of the coaxial double-pipe heat exchanger (3).
2. The shallow geothermal ground source heat pump system based on the intermediate geothermal energy as claimed in claim 1, wherein: the water inlet pipe (31) and the water outlet pipe (32) are respectively provided with a water inlet valve (34) and a water outlet valve (35).
3. The shallow geothermal ground source heat pump system based on the intermediate geothermal energy as claimed in claim 1, wherein: a first circulating pump (36) is arranged on the water outlet pipe (32), and the first circulating pump (36) is positioned between the heat pump (4) and the water outlet valve (35).
4. The shallow geothermal ground source heat pump system based on the intermediate geothermal energy as claimed in claim 1, wherein: and a first group of water inlet and outlet valves (11) are respectively arranged on the water inlet pipe and the water outlet pipe of the first shallow heat exchanger (1).
5. The shallow geothermal ground source heat pump system based on the intermediate geothermal energy as claimed in claim 1, wherein: and a second group of water inlet and outlet valves (21) are respectively arranged on the water inlet pipe and the water outlet pipe of the second shallow heat exchanger (2).
6. The shallow geothermal ground source heat pump system based on the intermediate geothermal energy as claimed in claim 1, wherein: and a third group of water inlet and outlet valves (51) are respectively arranged on water inlet and outlet pipes connected between the surface heat exchanger (5) and the first shallow heat exchanger (1).
7. The shallow geothermal ground source heat pump system based on the intermediate geothermal energy as claimed in claim 1, wherein: and a fourth group of water inlet and outlet valves (52) are respectively arranged on water inlet and outlet pipes connected between the surface heat exchanger (5) and the second shallow heat exchanger (2).
8. The shallow geothermal ground source heat pump system based on the intermediate geothermal energy as claimed in claim 1, wherein: the water outlet pipes of the first shallow heat exchanger (1) and the second shallow heat exchanger (2) are connected with a second circulating pump (37), and the second circulating pump (37) is connected with the ground surface heat exchanger (5).
9. The use method of the shallow geothermal ground source heat pump system based on the intermediate geothermal energy according to any one of claims 1 to 8, characterized by comprising the following steps:
s1, mounting, wherein the lower part of the coaxial double pipe heat exchanger (3) is positioned at the middle deep layer of a geothermal ground source, and the heat insulation layer (33) at the upper part of the coaxial double pipe heat exchanger (3) is positioned at the shallow layer of the ground;
s2, in autumn, closing the heat pump (4), sequentially opening a first group of water inlet and outlet valves (11), a second group of water inlet and outlet valves (21), a water inlet valve (34), a water outlet valve (35) and a first circulating pump (36), leading the middle-deep geothermal heat into a first shallow heat exchanger (1) and a second shallow heat exchanger (2) by the coaxial double-pipe heat exchanger (3), and heating the ground shallow by the first shallow heat exchanger (1) and the second shallow heat exchanger (2) for use in winter;
s3, closing the water inlet valve (34) and the water outlet valve (35) in the early stage of winter, sequentially opening the heat pump (4), the first group of water inlet and outlet valves (11) and the second group of water inlet and outlet valves (21), heating and supplying heat to the outside through the heat pump (4), and exchanging heat between the first shallow heat exchanger (1) and the second shallow heat exchanger (2);
s4, closing the first group of water inlet and outlet valves (11) and the second group of water inlet and outlet valves (21) at the later stage of winter, sequentially opening the water inlet valve (34), the water outlet valve (35), the first circulating pump (36), the third group of water inlet and outlet valves (51), the fourth group of water inlet and outlet valves (52) and the second circulating pump (37), carrying the ground heat at the middle and deep layers to the heat pump (4) for heating by the coaxial double-pipe heat exchanger (3), and carrying the low temperature at the ground surface to the first shallow heat exchanger (1) and the second shallow heat exchanger (2) by the ground surface heat exchanger (5) for cooling the ground shallow layer;
s5, closing the whole system in spring;
s6, in summer, closing the water inlet valve (34), the water outlet valve (35), the first circulating pump (36), the second circulating pump (37), the third group of water inlet and outlet valves (51) and the fourth group of water inlet and outlet valves (52), opening the first group of water inlet and outlet valves (11), the second group of water inlet and outlet valves (21) and the heat pump (4), and enabling the first superficial heat exchanger (1) and the second superficial heat exchanger (2) to cooperate with the heat pump for refrigeration.
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