CN116951825A - Outdoor buried pipe network structure of ground source heat pump, control method and construction method - Google Patents
Outdoor buried pipe network structure of ground source heat pump, control method and construction method Download PDFInfo
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- CN116951825A CN116951825A CN202311005833.2A CN202311005833A CN116951825A CN 116951825 A CN116951825 A CN 116951825A CN 202311005833 A CN202311005833 A CN 202311005833A CN 116951825 A CN116951825 A CN 116951825A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000010276 construction Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 219
- 239000002689 soil Substances 0.000 claims abstract description 94
- 238000001514 detection method Methods 0.000 claims abstract description 73
- 230000007246 mechanism Effects 0.000 claims abstract description 50
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 18
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
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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
- F24T2010/53—Methods for installation
-
- 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
- F24T2010/56—Control arrangements
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Sustainable Development (AREA)
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Abstract
The application discloses an outdoor buried pipe network structure of a ground source heat pump, a control method and a construction method, wherein the outdoor buried pipe network structure comprises a water inlet main pipe, a water outlet main pipe, a plurality of heat exchange mechanisms, a plurality of out-pipe soil temperature detection mechanisms and a controller; each heat exchange mechanism comprises a water inlet valve, a heat exchange pipe, a water inlet temperature detection part and a water outlet temperature detection part; the soil temperature detection mechanisms outside the tubes are respectively used for detecting the temperature of soil outside the heat exchange tubes of the corresponding heat exchange mechanisms. The beneficial effects of the application are as follows: the controller controls the opening of each water inlet valve according to the acquired temperature of the water outlet end of each heat exchange tube, so that higher heat exchange efficiency can be obtained under the condition that the water circulation speed is unchanged, and the running power consumption of the ground source heat pump system is reduced; in addition, when the controller has heat exchange faults, the fault type of the heat exchange pipe can be judged and output, so that maintenance staff can conveniently adopt a corresponding maintenance scheme, and the maintenance difficulty of the outdoor ground-buried pipeline network of the ground source heat pump is reduced.
Description
Technical Field
The application relates to the technical field of ground source heat pumps, in particular to an outdoor buried pipe network structure of a ground source heat pump, a control method and a construction method.
Background
The ground source heat pump system is a system which takes ground source energy as a cooling source for cooling in summer and a low-temperature heat source for heating in winter of the heat pump and simultaneously realizes heating, refrigeration and domestic hot water (such as China patent application No. CN 201410121757.6).
The specific installation process of the ground source heat pump system is as follows: the method comprises the steps of (1) geothermal thermal physical property testing, (2) ground punching, (3) double U-shaped heat exchange tube down-hole, (4) raw slurry recharging, (5) horizontal tube trench digging, (6) fine sand recharging well hole, (7) PV horizontal tube connection, (8) hydraulic balancer installation, (9) horizontal PE tube fine sand recharging, and (10) ground source heat pump machine room installation.
After the holes are drilled, the ground buried pipeline of the ground source heat pump system is placed in, then the holes are backfilled, after the holes are backfilled, the holes become permanent facilities and are integrated with the ground, and later modification and maintenance of the holes and heat exchange pipes in the holes are basically impossible to realize.
However, after the ground source heat pump system operates for a longer period, the heat exchange efficiency of a part of heat exchange wells can be greatly reduced, and as the heat exchange wells are refilled with primary pulp after construction, fault detection on heat exchange pipes in the heat exchange wells is difficult, so that the maintenance of the outdoor buried pipe network structure of the existing ground source heat pump is difficult.
Meanwhile, after the ground source heat pump system operates for a longer period, the heat exchange efficiency of part of heat exchange wells can be greatly reduced, but in the existing ground source heat pump system, the flow of water entering each heat exchange well is equal, and the heat exchange effect of circulating water entering the heat exchange well with lower heat exchange efficiency is poor, so that the circulating flow of a circulating pump has to be increased to meet the use requirement, and the operation power consumption of the ground source heat pump system is increased.
Disclosure of Invention
In view of the above, it is necessary to provide an outdoor buried pipe network structure, a control method and a construction method of a ground source heat pump, so as to solve the technical problems of difficult maintenance and high operation power consumption of the existing outdoor buried pipe network structure of the ground source heat pump.
In order to achieve the above purpose, the application provides an outdoor buried pipe network structure of a ground source heat pump, which comprises a water inlet main pipe, a water outlet main pipe, a plurality of heat exchange mechanisms, a plurality of soil temperature detection mechanisms outside pipes and a controller;
each heat exchange mechanism comprises a water inlet valve, a heat exchange tube, a water inlet temperature detection part and a water outlet temperature detection part, wherein one end of the water inlet valve is communicated with the water inlet main pipe, the other end of the water inlet valve is communicated with the water inlet end of the heat exchange tube, the water outlet end of the heat exchange tube is communicated with the water outlet main pipe, the water inlet temperature detection part is used for detecting the temperature of water in the water inlet end of the heat exchange tube, and the water outlet temperature detection part is used for detecting the temperature of water in the water outlet end of the heat exchange tube;
the number of the soil temperature detection mechanisms outside the pipes is equal to that of the heat exchange mechanisms, and the soil temperature detection mechanisms outside the pipes are in one-to-one correspondence, and each soil temperature detection mechanism outside the corresponding heat exchange mechanism is used for detecting the temperature of soil outside the heat exchange pipes;
the controller is connected with each soil temperature detection mechanism outside the pipe, each water inlet temperature detection piece, each water outlet temperature detection piece and each water inlet valve and is used for controlling the opening degree of the water inlet valve of each heat exchange mechanism and judging and outputting the fault type of the heat exchange pipe when the heat exchange pipe breaks down according to the measured data of each soil temperature detection mechanism outside the pipe, each water inlet temperature detection piece and each water outlet temperature detection piece.
In some embodiments, each of the outside-tube soil temperature detecting mechanisms includes a plurality of outside-tube soil temperature detecting members and fixing members, and each of the outside-tube soil temperature detecting members is fixed to the corresponding heat exchange tube of the heat exchange mechanism by the corresponding fixing member.
In some embodiments, the fixing member includes a first clamp, a second clamp and a plurality of fixing bolts, the first clamp and the second clamp are respectively sleeved on two sides of the heat exchange tube, the soil temperature detecting member outside the tube is fixed on the first clamp, and the fixing bolts are used for fixing the corresponding first clamp and the corresponding second clamp.
In some embodiments, the securing member further comprises a thermal block, and the out-of-pipe soil temperature sensing member is secured to the first clip via the thermal block.
In some embodiments, the fixture further comprises a shielding block secured to the insulation block and positioned above the out-of-pipe soil temperature sensing element.
In some embodiments, the heat exchange tube is a U-shaped heat exchange tube.
The application also provides an outdoor buried pipe network control method of the ground source heat pump, which is suitable for the outdoor buried pipe network structure of the ground source heat pump and comprises the following steps:
continuously acquiring the temperature of soil outside the corresponding heat exchange pipes and the temperatures of the water inlet ends and the water outlet ends of the corresponding heat exchange pipes, which are detected by the soil temperature detection mechanisms outside the pipes, the water inlet temperature detection pieces and the water outlet temperature detection pieces;
controlling the opening of each water inlet valve according to the acquired temperature of the water outlet end of each heat exchange tube;
and detecting whether the heat exchange tube has heat exchange faults according to the obtained temperature of soil outside each heat exchange tube and the obtained temperatures of the water inlet end and the water outlet end of each heat exchange tube, and judging and outputting the fault type of the heat exchange tube when the heat exchange faults occur.
In some embodiments, controlling the opening of each water inlet valve according to the obtained temperature of the water outlet end of each heat exchange tube specifically includes:
acquiring the temperature of the water outlet end of each heat exchange tube;
and increasing the opening of the water inlet valve corresponding to the heat exchange tube with higher temperature at the water outlet end or reducing the opening of the water inlet valve corresponding to the heat exchange tube with lower temperature at the water outlet end according to the temperature at the water outlet end of each heat exchange tube.
In some embodiments, according to the obtained temperature of soil outside each heat exchange tube and the obtained temperatures of the water inlet end and the water outlet end of each heat exchange tube, detecting whether the heat exchange tube has a heat exchange fault, and judging and outputting the fault type of the heat exchange tube when the heat exchange fault occurs, specifically including:
when the temperature difference between the water inlet end and the water outlet end of the heat exchange tube is smaller than a first preset value and the temperature difference between the water inlet end of the heat exchange tube and an ideal constant temperature layer is larger than a second preset value, judging that the heat exchange tube has heat exchange faults;
when the heat exchange pipe is detected to be faulty, if the difference between the temperature of the soil outside the heat exchange pipe and the temperature of the ideal constant temperature layer is larger than a third preset value, judging that the heat exchange fault of the heat exchange pipe is a soil energy supplementing fault; if the difference between the temperature of the soil outside the heat exchange tube and the ideal constant temperature layer is smaller than a third preset value, judging that the heat exchange failure of the heat exchange tube is heat transfer failure of the heat exchange tube.
The application also provides an outdoor buried pipe network construction method of the ground source heat pump, which is suitable for the outdoor buried pipe network structure of the ground source heat pump and comprises the following steps:
drilling holes on the outdoor ground to form a plurality of heat exchange wells;
providing a plurality of heat exchange pipes, vertically arranging the heat exchange pipes in the corresponding heat exchange wells, and backfilling each heat exchange well;
digging an installing groove for connecting the wellhead of each heat exchange well on the outdoor ground;
providing a water inlet main pipe and a water outlet main pipe, wherein the water inlet main pipe and the water outlet main pipe are arranged in the mounting groove, extend to the upper part of the mounting groove and are respectively connected with the water inlet end and the water outlet end of each heat exchange pipe;
and backfilling the mounting groove.
Compared with the prior art, the technical scheme provided by the application has the beneficial effects that: when the device is used, the controller continuously acquires the temperature of soil outside the corresponding heat exchange tubes and the temperature of the water inlet end and the water outlet end of the corresponding heat exchange tubes, which are detected by each soil temperature detection mechanism outside the tubes, each water inlet temperature detection piece and each water outlet temperature detection piece; the controller controls the opening of each water inlet valve according to the acquired temperature of the water outlet end of each heat exchange tube, namely, increases the opening of the water inlet valve corresponding to the heat exchange tube with higher temperature of the water outlet end or reduces the opening of the water inlet valve corresponding to the heat exchange tube with lower temperature of the water outlet end, so that higher heat exchange efficiency can be obtained under the condition that the water circulation speed is unchanged, and the running power consumption of the ground source heat pump system is reduced; in addition, the controller can also detect whether the heat exchange tube has heat exchange faults according to the obtained temperature of soil outside each heat exchange tube and the obtained temperatures of the water inlet end and the water outlet end of each heat exchange tube, and judge the fault type of the heat exchange tube and output the fault type when the heat exchange faults occur, so that the controller is convenient for maintenance personnel to adopt a corresponding maintenance scheme, and the maintenance difficulty of the outdoor ground-buried pipe network of the ground source heat pump is reduced.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an outdoor buried pipe network structure of a ground source heat pump according to the present application;
FIG. 2 is an enlarged view of a portion of area A of FIG. 1;
FIG. 3 is an enlarged partial view of region B of FIG. 1;
in the figure: 1-water inlet main pipe, 2-water outlet main pipe, 3-heat exchange mechanism, 31-water inlet valve, 32-heat exchange pipe, 33-water inlet temperature detection piece, 34-water outlet temperature detection piece, 4-soil temperature detection mechanism outside pipe, 41-soil temperature detection piece outside pipe, 42-fixing piece, 421-first clamp, 422-second clamp, 423-fixing bolt, 424-heat insulation block, 425-shielding block, 5-mounting groove and 6-heat exchange well.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
Referring to fig. 1-3, the application provides an outdoor buried pipe network structure of a ground source heat pump, which comprises a water inlet main pipe 1, a water outlet main pipe 2, a plurality of heat exchange mechanisms 3, a plurality of soil temperature detection mechanisms 4 outside the pipe and a controller (not shown);
each heat exchange mechanism 3 comprises a water inlet valve 31, a heat exchange pipe 32, a water inlet temperature detection member 33 and a water outlet temperature detection member 34, wherein one end of the water inlet valve 31 is communicated with the water inlet header pipe 1, the other end of the water inlet valve 31 is communicated with the water inlet end of the heat exchange pipe 32, the water outlet end of the heat exchange pipe 32 is communicated with the water outlet header pipe 2, the water inlet temperature detection member 33 is used for detecting the temperature of water in the water inlet end of the heat exchange pipe 32, and the water outlet temperature detection member 34 is used for detecting the temperature of water in the water outlet end of the heat exchange pipe 32;
the number of the soil temperature detection mechanisms 4 outside the pipe is equal to that of the heat exchange mechanisms 3, and the soil temperature detection mechanisms 4 outside the pipe are in one-to-one correspondence, and each soil temperature detection mechanism 4 outside the heat exchange pipe 32 of the corresponding heat exchange mechanism 3 is used for detecting the temperature of soil;
the controller is connected to each of the soil temperature outside the pipe detecting means 4, each of the water inlet temperature detecting means 33, each of the water outlet temperature detecting means 34, each of the water inlet valves 31, and is configured to control the opening degree of the water inlet valve 31 of each of the heat exchanging means 3 and to judge and output the type of failure of the heat exchanging pipe 31 when the heat exchanging pipe 32 fails, based on the measured data of each of the soil temperature outside the pipe detecting means 4, each of the water inlet temperature detecting means 33, and each of the water outlet temperature detecting means 34.
When in use, the controller continuously acquires the soil temperature outside the corresponding heat exchange tube 32 and the water inlet end and the water outlet end of the corresponding heat exchange tube 32 detected by each outside-tube soil temperature detection mechanism 4, each water inlet temperature detection piece 33 and each water outlet temperature detection piece 34; the controller controls the opening degree of each water inlet valve 31 according to the acquired temperature of the water outlet end of each heat exchange tube 32, increases the opening degree of the water inlet valve 31 corresponding to the heat exchange tube 32 with higher temperature of the water outlet end or decreases the opening degree of the water inlet valve 31 corresponding to the heat exchange tube 32 with lower temperature of the water outlet end, so that higher heat exchange efficiency can be obtained under the condition that the water circulation speed is unchanged, and the running power consumption of the ground source heat pump system is reduced; in addition, the controller can also detect whether the heat exchange tube 32 has heat exchange faults according to the obtained temperature of soil outside each heat exchange tube 32 and the obtained temperatures of the water inlet end and the water outlet end of each heat exchange tube 32, and judge the fault type of the heat exchange tube 32 and output the fault type when the heat exchange faults occur, so that the maintainer can conveniently adopt a corresponding maintenance scheme, and the maintenance difficulty of the outdoor ground-buried pipe network of the ground source heat pump is reduced.
In order to specifically implement the function of the out-of-pipe soil temperature detection mechanism 4, please refer to fig. 1-3, in a preferred embodiment, each out-of-pipe soil temperature detection mechanism 4 includes a plurality of out-of-pipe soil temperature detection members 41 and fixing members 42, each out-of-pipe soil temperature detection member 41 is fixed on a corresponding heat exchange tube 32 of the heat exchange mechanism 3 by a corresponding fixing member 42, and in this embodiment, each heat exchange tube 32 is provided with a plurality of soil temperature detection members 41 along the length direction, thereby facilitating analysis of the change relationship of the soil temperature with the depth.
In order to specifically implement the function of the fixing member 42, referring to fig. 1-3, in a preferred embodiment, the fixing member 42 includes a first clamp 421, a second clamp 422, and a plurality of fixing bolts 423, the first clamp 421 and the second clamp 422 are respectively sleeved on two sides of the heat exchange tube 32, the soil temperature detecting member 41 outside the tube is fixed on the first clamp 421, and the fixing bolts 423 are used for fixing the corresponding first clamp 421 and the corresponding second clamp 422.
In order to prevent the heat exchange tube 32 from affecting the measurement result of the external soil temperature detecting member 41, referring to fig. 1 to 3, in a preferred embodiment, the fixing member 42 further includes a heat insulation block 424, and the external soil temperature detecting member 41 is fixed on the first clamp 421 via the heat insulation block 424, so that the water temperature in the heat exchange tube 32 can be blocked by providing the heat insulation block 424, and the detection result of the external soil temperature detecting member 41 can be prevented from being affected.
In order to avoid the muddy water falling down during backfilling the heat exchange well from impacting the soil temperature detection member 41 outside the pipe, referring to fig. 1 to 3, in a preferred embodiment, the fixing member 42 further includes a shielding block 425, and the shielding block 425 is fixed on the heat insulation block 424 and located above the soil temperature detection member 41 outside the pipe, so as to protect the soil temperature detection member 41 outside the pipe.
In order to specifically implement the function of the heat exchange tube 32, referring to fig. 1-3, in a preferred embodiment, the heat exchange tube 32 is a U-shaped heat exchange tube.
The application also provides an outdoor buried pipe network control method of the ground source heat pump, which is suitable for the outdoor buried pipe network structure of the ground source heat pump and comprises the following steps:
s1, continuously acquiring the temperature of soil outside the corresponding heat exchange tubes 32 and the temperature of the water inlet end and the water outlet end of the corresponding heat exchange tubes 32 detected by each outside-tube soil temperature detection mechanism 4, each water inlet temperature detection piece 33 and each water outlet temperature detection piece 34;
s2, controlling the opening degree of each water inlet valve 31 according to the acquired temperature of the water outlet end of each heat exchange tube 32, increasing the opening degree of the water inlet valve 31 corresponding to the heat exchange tube 32 with higher temperature of the water outlet end or reducing the opening degree of the water inlet valve 31 corresponding to the heat exchange tube 32 with lower temperature of the water outlet end, so that higher heat exchange efficiency can be obtained under the condition that the water circulation speed is unchanged, and the running power consumption of the ground source heat pump system is reduced;
the step S2 specifically comprises the following steps:
s21, acquiring the temperature of the water outlet end of each heat exchange tube 32;
s22, according to the temperature of the water outlet end of each heat exchange tube 32, increasing the opening of the water inlet valve 31 corresponding to the heat exchange tube 32 with higher temperature of the water outlet end, or decreasing the opening of the water inlet valve 31 corresponding to the heat exchange tube 32 with lower temperature of the water outlet end.
The principle is as follows: when the heat exchange efficiency of one heat exchange tube 32 is reduced, the opening of the water inlet valve 31 corresponding to the heat exchange tube 32 is reduced so as to reduce the flow of water entering the heat exchange tube 32, and accordingly, the flow of water in the heat exchange tube 32 with normal heat exchange can be increased without increasing the output power of the circulating pump, so that the heat exchange efficiency can be improved, and the running power consumption of the ground source heat pump system can be reduced.
S3, detecting whether the heat exchange tube 32 has heat exchange faults or not according to the obtained temperature of soil outside the heat exchange tubes 32 and the obtained temperatures of the water inlet end and the water outlet end of the heat exchange tubes 32, and judging and outputting the fault type of the heat exchange tubes 32 when the heat exchange faults occur, so that maintenance staff can conveniently adopt a corresponding maintenance scheme, and the maintenance difficulty of the outdoor ground-buried pipe network of the ground source heat pump is reduced.
The step S3 specifically comprises the following steps:
s31, when the temperature difference between the water inlet end and the water outlet end of the heat exchange tube 32 is smaller than a first preset value and the temperature difference between the water inlet end of the heat exchange tube 32 and an ideal constant temperature layer is larger than a second preset value, judging that the heat exchange tube 32 has heat exchange failure; this is because, when the temperature difference between the water inlet end and the water outlet end of the heat exchange tube 32 is smaller than the first preset value (for example, 5 ℃) and indicates that the temperature change is very small after the water passes through the heat exchange tube 32 and has no heat exchange effect, the situation is generally caused by two reasons, namely, the heat exchange tube 32 has a heat exchange failure, and the heat exchange tube 32 has no heat exchange failure, but because the ground or the indoor temperature is close to the underground soil temperature, the temperature of the water in the heat exchange tube 32 has no large change on the ground, so that the temperature difference between the water inlet end of the heat exchange tube 32 and the temperature of the soil deep in the ground is small, in this case, the temperature of the water outlet pipe of the heat exchange tube 32 obviously has no large difference from the temperature of the water inlet end, and in order to exclude the normal situation, in the application, by detecting whether the difference between the temperature of the water inlet end of the heat exchange tube 32 and the ideal constant temperature layer (generally 15 ℃) is larger than the second preset value, if the heat exchange tube 32 has an abnormality, the heat exchange failure is indicated if the heat exchange tube 32 has no heat exchange failure.
S32, after detecting that the heat exchange tube 32 fails, if the difference between the temperature of the soil outside the heat exchange tube 32 and the temperature of the ideal constant temperature layer is greater than a third preset value, judging that the heat exchange failure of the heat exchange tube is a soil energy supplementing failure; if the difference between the temperature of the soil outside the heat exchange tube 32 and the ideal constant temperature layer is smaller than the third preset value, the heat exchange failure of the heat exchange tube 32 is judged to be heat transfer failure of the heat exchange tube. In the present embodiment, since the plurality of outside-tube soil temperature detecting members 4 are arranged in each heat exchange tube 32 from top to bottom, in practical application, the measurement results of the outside-tube soil temperature detecting members 4 having a depth of more than 80 m or less are averaged as the outside-tube soil temperature, because the temperature of the soil layer at a shallower position does not reflect the temperature of the deep constant temperature layer, but the soil temperature of generally 80 m or less is kept constant.
The principle is as follows: there are generally two reasons for heat exchange failure of the heat exchange tubes 32: firstly, the heat exchange efficiency of the heat exchange tube is reduced due to scaling and other reasons; secondly, because the energy supplement of the underground soil is insufficient, the temperature difference between the soil contacted by the heat exchange tube and the ideal constant temperature layer is large, so that the heat exchange cannot be realized. In order to distinguish the two conditions, in the application, whether the difference between the temperature of the soil outside the heat exchange tube 32 and the temperature of the ideal constant temperature layer is larger than a third preset value is detected, if so, the difference between the temperature of the underground soil and the temperature of the ideal constant temperature layer is larger, the heat exchange failure of the heat exchange tube is judged to be a soil energy supplementing failure, after the failure occurs, the geological detection is needed to be carried out on the whole construction area again, the heat exchange efficiency of the underground soil is determined, and in serious cases, a new heat exchange well needs to be abandoned to be continuously excavated, and the maintenance can be carried out by adopting a mode of combining an air cooling heat pump and a ground source heat pump; if the difference between the temperature of the soil outside the heat exchange tube 32 and the ideal constant temperature layer is smaller than the third preset value, the heat exchange failure of the heat exchange tube 32 is judged to be heat transfer failure of the heat exchange tube, and a heat exchange well can be directly drilled near the heat exchange tube 32 under the condition, and a new heat exchange tube is rearranged and connected to the heat exchange system.
The application also provides an outdoor buried pipe network construction method of the ground source heat pump, which is suitable for the outdoor buried pipe network structure of the ground source heat pump and comprises the following steps:
(1) Drilling holes on the outdoor ground to form a plurality of heat exchange wells 6;
(2) Providing a plurality of heat exchange pipes 32, vertically arranging the heat exchange pipes 32 in the corresponding heat exchange wells 6, and backfilling each heat exchange well 32;
(3) Digging an installation groove 5 for connecting the wellhead of each heat exchange well 6 on the outdoor ground;
(4) Providing a water inlet main pipe 1 and a water outlet main pipe 2, arranging the water inlet main pipe 1 and the water outlet main pipe 2 in an installation groove 5, extending to the upper part of the installation groove 5, and respectively connecting with the water inlet end and the water outlet end of each heat exchange pipe 32;
(5) The mounting groove 5 is backfilled.
The technical scheme provided by the application has the beneficial effects that:
(1) Continuously acquiring the temperature of the soil outside the corresponding heat exchange tube 32 and the temperatures of the water inlet end and the water outlet end of the corresponding heat exchange tube 32 detected by the outside-tube soil temperature detection mechanism 4, the water inlet temperature detection pieces 33 and the water outlet temperature detection pieces 34 through a controller; the controller controls the opening degree of each water inlet valve 31 according to the acquired temperature of the water outlet end of each heat exchange tube 32, increases the opening degree of the water inlet valve 31 corresponding to the heat exchange tube 32 with higher temperature of the water outlet end or decreases the opening degree of the water inlet valve 31 corresponding to the heat exchange tube 32 with lower temperature of the water outlet end, so that higher heat exchange efficiency can be obtained under the condition that the water circulation speed is unchanged, and the running power consumption of the ground source heat pump system is reduced;
(2) The controller can also detect whether the heat exchange tube 32 has heat exchange faults according to the obtained temperature of the soil outside each heat exchange tube 32 and the obtained temperatures of the water inlet end and the water outlet end of each heat exchange tube 32, and judge the fault type of the heat exchange tube 32 and output the fault type when the heat exchange faults occur, so that the maintenance personnel can conveniently adopt a corresponding maintenance scheme, and the maintenance difficulty of the outdoor ground-buried pipe network of the ground source heat pump is reduced.
The foregoing is only a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be included in the scope of the present application.
Claims (10)
1. The outdoor buried pipe network structure of the ground source heat pump is characterized by comprising a water inlet main pipe, a water outlet main pipe, a plurality of heat exchange mechanisms, a plurality of soil temperature detection mechanisms outside the pipe and a controller;
each heat exchange mechanism comprises a water inlet valve, a heat exchange tube, a water inlet temperature detection part and a water outlet temperature detection part, wherein one end of the water inlet valve is communicated with the water inlet main pipe, the other end of the water inlet valve is communicated with the water inlet end of the heat exchange tube, the water outlet end of the heat exchange tube is communicated with the water outlet main pipe, the water inlet temperature detection part is used for detecting the temperature of water in the water inlet end of the heat exchange tube, and the water outlet temperature detection part is used for detecting the temperature of water in the water outlet end of the heat exchange tube;
the number of the soil temperature detection mechanisms outside the pipes is equal to that of the heat exchange mechanisms, and the soil temperature detection mechanisms outside the pipes are in one-to-one correspondence, and each soil temperature detection mechanism outside the corresponding heat exchange mechanism is used for detecting the temperature of soil outside the heat exchange pipes;
the controller is connected with each soil temperature detection mechanism outside the pipe, each water inlet temperature detection piece, each water outlet temperature detection piece and each water inlet valve and is used for controlling the opening degree of the water inlet valve of each heat exchange mechanism and judging and outputting the fault type of the heat exchange pipe when the heat exchange pipe breaks down according to the measured data of each soil temperature detection mechanism outside the pipe, each water inlet temperature detection piece and each water outlet temperature detection piece.
2. The outdoor underground pipe network structure of claim 1, wherein each of the outdoor soil temperature detecting mechanisms comprises a plurality of outdoor soil temperature detecting members and fixing members, and each of the outdoor soil temperature detecting members is fixed on the corresponding heat exchange pipe of the heat exchange mechanism through the corresponding fixing member.
3. The outdoor underground pipe network structure of the ground source heat pump according to claim 2, wherein the fixing member comprises a first clamp, a second clamp and a plurality of fixing bolts, the first clamp and the second clamp are respectively sleeved on two sides of the heat exchange pipe, the soil temperature detecting member outside the pipe is fixed on the first clamp, and the fixing bolts are used for fixing the corresponding first clamp and the corresponding second clamp.
4. A buried outdoor pipe network structure of a ground source heat pump according to claim 3, wherein said fixing member further comprises a heat insulating block, and said outside-pipe soil temperature detecting member is fixed to said first clip via said heat insulating block.
5. The outdoor underground piping network structure of a ground source heat pump of claim 4, wherein said fixing member further comprises a shielding block fixed to said heat insulating block and located above said outside-pipe soil temperature detecting member.
6. The outdoor buried pipe network structure of a ground source heat pump according to claim 1, wherein the heat exchange pipe is a U-shaped heat exchange pipe.
7. An outdoor ground pipe network control method of a ground source heat pump, which is suitable for the outdoor ground pipe network structure of the ground source heat pump according to any one of claims 1 to 6, and comprises the following steps:
continuously acquiring the temperature of soil outside the corresponding heat exchange pipes and the temperatures of the water inlet ends and the water outlet ends of the corresponding heat exchange pipes, which are detected by the soil temperature detection mechanisms outside the pipes, the water inlet temperature detection pieces and the water outlet temperature detection pieces;
controlling the opening of each water inlet valve according to the acquired temperature of the water outlet end of each heat exchange tube;
and detecting whether the heat exchange tube has heat exchange faults according to the obtained temperature of soil outside each heat exchange tube and the obtained temperatures of the water inlet end and the water outlet end of each heat exchange tube, and judging and outputting the fault type of the heat exchange tube when the heat exchange faults occur.
8. The method for controlling an outdoor ground-buried pipe network of a ground source heat pump according to claim 7, wherein controlling the opening of each water inlet valve according to the obtained temperature of the water outlet end of each heat exchange pipe comprises:
acquiring the temperature of the water outlet end of each heat exchange tube;
and increasing the opening of the water inlet valve corresponding to the heat exchange tube with higher temperature at the water outlet end or reducing the opening of the water inlet valve corresponding to the heat exchange tube with lower temperature at the water outlet end according to the temperature at the water outlet end of each heat exchange tube.
9. The method for controlling an outdoor ground-buried pipe network of a ground source heat pump according to claim 7, wherein detecting whether a heat exchange failure occurs in the heat exchange pipe according to the obtained temperature of soil outside each heat exchange pipe and the obtained temperatures of the water inlet end and the water outlet end of each heat exchange pipe, and judging and outputting the failure type of the heat exchange pipe when the heat exchange failure occurs, specifically comprising:
when the temperature difference between the water inlet end and the water outlet end of the heat exchange tube is smaller than a first preset value and the temperature difference between the water inlet end of the heat exchange tube and an ideal constant temperature layer is larger than a second preset value, judging that the heat exchange tube has heat exchange faults;
when the heat exchange pipe is detected to be faulty, if the difference between the temperature of the soil outside the heat exchange pipe and the temperature of the ideal constant temperature layer is larger than a third preset value, judging that the heat exchange fault of the heat exchange pipe is a soil energy supplementing fault; if the difference between the temperature of the soil outside the heat exchange tube and the ideal constant temperature layer is smaller than a third preset value, judging that the heat exchange failure of the heat exchange tube is heat transfer failure of the heat exchange tube.
10. An outdoor buried pipe network construction method of a ground source heat pump, which is suitable for the outdoor buried pipe network structure of the ground source heat pump according to any one of claims 1 to 6, and comprises the following steps:
drilling holes on the outdoor ground to form a plurality of heat exchange wells;
providing a plurality of heat exchange pipes, vertically arranging the heat exchange pipes in the corresponding heat exchange wells, and backfilling each heat exchange well;
digging an installing groove for connecting the wellhead of each heat exchange well on the outdoor ground;
providing a water inlet main pipe and a water outlet main pipe, wherein the water inlet main pipe and the water outlet main pipe are arranged in the mounting groove, extend to the upper part of the mounting groove and are respectively connected with the water inlet end and the water outlet end of each heat exchange pipe;
and backfilling the mounting groove.
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