CN203810794U - Ground heat exchanger structure of ground source heat pump air-conditioning system - Google Patents
Ground heat exchanger structure of ground source heat pump air-conditioning system Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 230000004308 accommodation Effects 0.000 claims description 4
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- 210000002310 elbow joint Anatomy 0.000 claims 6
- 239000003673 groundwater Substances 0.000 claims 1
- 238000012546 transfer Methods 0.000 abstract description 23
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- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 16
- 239000003507 refrigerant Substances 0.000 description 12
- 239000004698 Polyethylene Substances 0.000 description 11
- 238000009825 accumulation Methods 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 7
- 239000002689 soil Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 5
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- 210000000664 rectum Anatomy 0.000 description 5
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- 238000001816 cooling Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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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
- F24T10/15—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 bent tubes; using tubes assembled with connectors or with return headers
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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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Abstract
本实用新型提供了一种地源热泵空调系统的地埋管换热器结构，其通过对地埋进水管、地埋出水管以及U型弯管接头的结构改善，从地埋管换热器由进至出的流通通道中的多个环节上缓解了降低换热效率的促发因素，延长了地埋管换热器的使用寿命，增强了地埋管换热器的换热性能，从而提高了地埋管换热器管内水流与地热资源之间的换热效率。将本实用新型的地埋管换热器结构应用在地源热泵空调系统中，能够帮助提高地源热泵空调系统的能效，降低系统能耗和故障率，从而有效解决现有的地埋管换热器结构容易导致地源热泵空调系统换热效率低、故障率较高、能效较低、节能效益不显著等问题。
The utility model provides a buried pipe heat exchanger structure of a ground source heat pump air-conditioning system. Multiple links in the circulation channel from in to out alleviate the factors that reduce the heat exchange efficiency, prolong the service life of the buried tube heat exchanger, and enhance the heat transfer performance of the buried tube heat exchanger, thereby The heat exchange efficiency between the water flow in the tube of the buried tube heat exchanger and the geothermal resource is improved. Applying the buried pipe heat exchanger structure of the present utility model to the ground source heat pump air-conditioning system can help improve the energy efficiency of the ground source heat pump air-conditioning system, reduce system energy consumption and failure rate, and thus effectively solve the problem of existing buried pipe replacement. The structure of the heater can easily lead to problems such as low heat transfer efficiency, high failure rate, low energy efficiency, and insignificant energy-saving benefits of the ground source heat pump air-conditioning system.
Description
Technical field
The utility model relates to air-conditioning and heat supply process field, is specifically related to a kind of ground heat exchanger structure of geothermal heat pump air-conditioning system.
Background technology
Along with the raising of expanding economy and people's living standard, the warm air-conditioning of the confession of public building and house has become general requirement.As the coal-burning boiler of the traditional heat supply of China, not only energy utilization rate is low, but also can cause serious pollution to atmosphere, and therefore in some cities, coal-burning boiler is progressively being eliminated, and fuel-oil or fuel-gas boiler operating cost is very high.Geothermal heat pump air-conditioning system is exactly technically a kind of and all has economically the solution heat supply of greater advantage and the alternative of air-conditioning.
Geothermal heat pump air-conditioning system, is a kind of highly effective energy-conserving environmental-protecting type air-conditioning system of utilizing underground shallow layer geothermal energy resources can heat supply can freeze again, is the one of central air conditioner system.In system, earth source heat pump, by a small amount of high-grade energy (electric energy) of input, can be realized the transfer of energy from low-temperature heat source to high temperature heat source.In the winter time, the heat in soil " is got " out, after raising temperature, supply chamber is interior for heating; In summer, indoor heat " is got " and is out discharged in soil and goes, and can ensure the equilibrium of subsurface temperature throughout the year, there are energy-conserving and environment-protective.
The primary structure of geothermal heat pump air-conditioning system as shown in Figure 1, it is mainly made up of earth source heat pump unit 1, air conditioning terminal 11 and ground heat exchanger 12, between three, carry out the transmission of heat as heat transferring medium by water or air, drive the heat transferring medium between earth source heat pump unit 1 and ground heat exchanger 12 to circulate by underground pipe heat exchange circulating pump 2, drive the heat transferring medium between earth source heat pump unit 1 and air conditioning terminal 11 to circulate by air-conditioning heat exchange circulating pump 10; Wherein, between earth source heat pump unit 1 and ground heat exchanger 12, heat transferring medium is water, with air conditioning terminal 11 heat transferring mediums in building can be water or air.
Geothermal heat pump air-conditioning system is heating under state, and the compressor in earth source heat pump unit does work to refrigerant, makes it carry out the circulation that liquid-vapour transforms; Under the driving of underground pipe heat exchange circulating pump, absorb the heat in underground water or soil by outdoor ground heat exchanger, by the evaporation of refrigerant in earth source heat pump machine set system, by the heat absorption in the waterway circulating of ground heat exchanger to refrigerant; Under the driving of air-conditioning heat exchange circulating pump, in refrigerant circulation, air conditioning terminal is again by the condensation of refrigerant in refrigerant-air heat exchanger, by air circulation by heat absorption entrained refrigerant; Constantly be transferred in indoor process at underground heat, by indoor air conditioning terminal to indoor heating.
Geothermal heat pump air-conditioning system is under refrigerating state, and the compressor in earth source heat pump unit does work to refrigerant, makes it carry out the circulation of vapour-liquid conversion; Under the driving of air-conditioning heat exchange circulating pump, the evaporation of air conditioning terminal by refrigerant in refrigerant-air heat exchanger by heat absorption entrained indoor air circulation to refrigerant, in refrigerant circulation again by the condensation of refrigerant in refrigerant-water heat exchanger; Under the driving of underground pipe heat exchange circulating pump, by the circulation waterway between earth source heat pump unit and ground heat exchanger by heat absorption entrained in refrigerant, finally by outdoor ground heat exchanger by transfer of heat to underground water or soil; Constantly be transferred in underground process by air conditioning terminal, earth source heat pump unit and ground heat exchanger at indoor heat, by the refrigerant-air heat exchanger of air conditioning terminal, taking the form of cold wind as indoor cooling.
But, in existing geothermal heat pump air-conditioning system research, often mainly pay close attention to the heat exchanger efficiency problem between earth source heat pump unit and ground heat exchanger and between air conditioning terminal, and actually rare for the heat exchanger efficiency research of ground heat exchanger.Current ground heat exchanger structure is conventionally comparatively simple, as shown in Figure 1, conventionally by buried water inlet pipe 4, buried outlet pipe 6 vertical parallel arranged imbed underground, between buried water inlet pipe 4 and buried outlet pipe 6, interfix by pipe clamp 9, using the upper end mouth of pipe of buried water inlet pipe 4 and buried outlet pipe 6 respectively as water inlet and the delivery port of ground heat exchanger, the lower end of buried water inlet pipe 4 and buried outlet pipe 6 is connected by U-shaped bend pipe 5, forms ground heat exchanger 12; On the high subaerial heterodoxy body of buried outlet pipe 6, be conventionally also provided with muff 8 in order to insulation; Its buried water inlet pipe 4, buried outlet pipe 6 adopts common PE(polyethylene conventionally) pipeline, and its U-shaped bend pipe 5 also adopts and the PE bend pipe of buried water inlet pipe 4, buried outlet pipe 6 identical bores conventionally.On the one hand, the inwall that common PE pipe is smooth is unfavorable for promoting underground water or the soil to execute heat exchange outside in-pipe flow and pipe.On the other hand, at ground heat exchanger laid processes and electricity, in hot melt adapter process, in pipeline, can enter unavoidably silt and tubing chip, simultaneously in long-term running, impurity in the same meeting in ground heat exchanger bottom accumulated water, dirt etc., due to the buried water inlet pipe of ground heat exchanger, buried outlet pipe height is generally 80 ~ 100 meters, and generally adopt the PE pipe of DN32 and DN25, caliber is less, in pipe, operation flow velocity is conventionally within the scope of 0.4m/s ~ 0.6m/s, stopping up object is difficult to by flowing out ground by current from buried outlet pipe, finally easily because accumulating too much impurity, U-shaped bend pipe affects the overall flow velocity of ground heat exchanger water circulation, also easily cause that geothermal heat pump air-conditioning system frequently breaks down simultaneously.According to " ground source heat pump project technical specification (GB-50366-2009 version) ", specify that the minimum rate of circulating flow of the ground heat exchanger in geothermal heat pump air-conditioning system is 0.4m/s, when lower than this flow velocity, ground heat exchanger is interior because flow velocity is too low, tube wall is in laminar condition, to seriously restrict heat transfer effect, laminar flow regime has increased SR simultaneously, in addition buried water inlet pipe, the inwall heat transfer effect that buried outlet pipe is smooth is poor, SR is large, finally cause the annual many places of geothermal heat pump air-conditioning system to be moved under low load condition, heat exchange efficiency is low, even because blocking completely, geothermal tube heat exchanger causes its lost of life.Thereby in earth source heat pump life cycle management, cause occurring the problems such as efficiency is lower, fault rate is higher, energy-saving benefit is not remarkable.Side by side in heat exchange of heat pipe, the problem of U-shaped bend pipe accumulated impurity also easily causes its pipeline obstruction, and then has shortened the service life of geothermal tube heat exchanger.It is larger that ground heat exchanger is built initial cost, and generally, cloth is built the expenses such as the boring well-digging expense of ground heat exchanger and tubing, backfill, amounts to 10,000 yuan of left and right.Therefore, how to extend ground heat exchanger service life, strengthen its heat exchange efficiency, be problem demanding prompt solution in geothermal heat pump air-conditioner technology.
Summary of the invention
For above shortcomings in prior art, the purpose of this utility model is to provide a kind of ground heat exchanger structure of geothermal heat pump air-conditioning system, to pass through Structure Improvement, extend the service life of ground heat exchanger, and the heat exchange property of ground heat exchanger is strengthened, can improve the heat exchange efficiency between its in-pipe flow and geothermal energy resources, easily cause the problems such as geothermal heat pump air-conditioning system heat exchange efficiency is low, fault rate is higher, efficiency is lower, energy-saving benefit is not remarkable to solve existing ground heat exchanger structure.
For solving the problems of the technologies described above, the utility model has adopted following technological means:
A ground heat exchanger structure for geothermal heat pump air-conditioning system, comprises buried water inlet pipe, buried outlet pipe and U-shaped union elbow; The upper end mouth of pipe of described buried water inlet pipe and buried outlet pipe is respectively as water inlet and the delivery port of ground heat exchanger, the lower end of buried water inlet pipe and buried outlet pipe is connected with water inlet port and the water outlet port of U-shaped union elbow respectively, and interfixes by pipe clamp between buried water inlet pipe and buried outlet pipe;
On the inwall of described buried water inlet pipe and buried outlet pipe, be all provided with diversion groove along its bearing of trend;
The bottom of described U-shaped union elbow has the chamber resettling that a latus rectum is greater than buried water inlet pipe and buried outlet pipe internal diameter, one side of described chamber resettling is communicated to the water inlet port of U-shaped union elbow by intake tunnel, opposite side is communicated to the water outlet port of U-shaped union elbow by exhalant canal, the bottom surface of chamber resettling is recessed cambered surface, and has one from the upwardly extending barrier in chamber resettling bottom surface near exhalant canal one side on chamber resettling bottom surface; The position that is positioned at chamber resettling top between described intake tunnel and exhalant canal is also provided with communicating passage.
As a kind of preferred version on the ground heat exchanger architecture basics of above-mentioned geothermal heat pump air-conditioning system, the diversion groove on the inwall of described buried water inlet pipe and buried outlet pipe is the longitudinal fluting arranging along its pipeline bearing of trend.
As the another kind of preferred version on the ground heat exchanger architecture basics of above-mentioned geothermal heat pump air-conditioning system, the diversion groove on the inwall of described buried water inlet pipe and buried outlet pipe is the helical groove arranging along its pipeline bearing of trend spiral.
As a kind of preferred version on the ground heat exchanger architecture basics of above-mentioned geothermal heat pump air-conditioning system, on the chamber resettling bottom surface of described U-shaped union elbow, the longitudinal cross-section of the barrier of close exhalant canal one side is up-small and down-big triangle or trapezoidal shape.
Than prior art, the utlity model has following beneficial effect:
1, in the ground heat exchanger structure of the utility model geothermal heat pump air-conditioning system, on the inwall of buried water inlet pipe and buried outlet pipe, along its bearing of trend, diversion groove is set, to in-pipe flow water conservancy diversion, by diversion groove convection cell water conservancy diversion on inwall, the laminar flow layer attenuation of fluid, turbulence intensity are increased, thereby increase the heat transfer coefficient between current and tube wall, and increase the heat exchange contact area of current and tube wall, make thus the heat exchange efficiency of buried water inlet pipe and buried outlet pipe be promoted.
2, in the ground heat exchanger structure of the utility model geothermal heat pump air-conditioning system, the chamber resettling of the bottom by U-shaped union elbow holds accumulation thing, and prevent that by barrier the current scour that in chamber resettling, a large amount of accumulation things are flowed to exhalant canal from intake tunnel from entering buried outlet pipe and causing line clogging, also ensure by the communicating passage between U-shaped union elbow intake tunnel and exhalant canal that better water circulation is unimpeded simultaneously, solve that to block the SR causing large because of U-shaped union elbow, fault rate is high, the problem that heat transfer effect is poor, trafficability performance and the heat exchange property of ground heat exchanger are promoted, extend the service life of ground heat exchanger.
3, the ground heat exchanger structure of the utility model geothermal heat pump air-conditioning system, from starting with of its pipeline self structure, improve and optimize by the many-side of structure, the heat exchange property of ground heat exchanger is strengthened, improve the heat exchange efficiency between ground heat exchanger in-pipe flow and geothermal energy resources, can help to improve the efficiency of geothermal heat pump air-conditioning system, reduce system energy consumption and fault rate, thereby effectively solving existing ground heat exchanger structure easily causes geothermal heat pump air-conditioning system heat exchange efficiency low, fault rate is higher, efficiency is lower, the problems such as energy-saving benefit is not remarkable.
Brief description of the drawings
Fig. 1 is the structural representation of geothermal heat pump air-conditioning system in prior art.
Fig. 2 is the radial view of buried water inlet pipe or a kind of pipeline configuration of buried outlet pipe in the ground heat exchanger structure of the utility model geothermal heat pump air-conditioning system.
Fig. 3 is the A-A cutaway view of pipeline configuration shown in Fig. 2.
Fig. 4 is the radial view of buried water inlet pipe or the another kind of pipeline configuration of buried outlet pipe in the ground heat exchanger structure of the utility model geothermal heat pump air-conditioning system.
Fig. 5 is the B-B cutaway view of pipeline configuration shown in Fig. 4.
Fig. 6 is the sectional structure schematic diagram of U-shaped union elbow in the ground heat exchanger structure of the utility model geothermal heat pump air-conditioning system.
Detailed description of the invention
Below in conjunction with drawings and Examples, the technical solution of the utility model is described further.
The utility model provides a kind of ground heat exchanger structure of geothermal heat pump air-conditioning system, it is by structure optimization, alleviate from many aspects the precipitating factor that reduces heat exchange efficiency, the heat exchange property of ground heat exchanger is strengthened, can improve the heat exchange efficiency between its in-pipe flow and geothermal energy resources, and then help improves the efficiency of geothermal heat pump air-conditioning system, reduction system energy consumption.
The unitary construction of the ground heat exchanger structure of the utility model geothermal heat pump air-conditioning system, is mainly made up of buried water inlet pipe, buried outlet pipe and U-shaped union elbow; The upper end mouth of pipe of buried water inlet pipe and buried outlet pipe is respectively as water inlet and the delivery port of ground heat exchanger, the lower end of buried water inlet pipe and buried outlet pipe is connected with water inlet port and the water outlet port of U-shaped union elbow respectively, and interfixes by pipe clamp between buried water inlet pipe and buried outlet pipe.Be with the main difference of ground heat exchanger in prior art, the structure of water pipe, buried outlet pipe and U-shaped union elbow of nuzzling over the ground in the utility model ground heat exchanger structure is all optimized improvement, and has changed the distributed architecture of buried water inlet pipe, buried outlet pipe.
In ground heat exchanger structure of the present utility model, on the inwall of buried water inlet pipe and buried outlet pipe, be all provided with diversion groove along its bearing of trend.Particularly, diversion groove on buried water inlet pipe and buried outlet pipe inwall can be the longitudinal fluting arranging along its pipeline bearing of trend, as shown in Figures 2 and 3, wherein label 10 represents the tube wall of buried water inlet pipe or buried outlet pipe, and label 1a represents longitudinal fluting; Also can be the helical groove arranging along its pipeline bearing of trend spiral, as shown in Figure 4 and Figure 5, wherein label 10 represents the tube wall of buried water inlet pipe or buried outlet pipe, and label 1b represents helical groove.Than the common PE pipe of available technology adopting inner wall smooth as buried water inlet pipe and buried outlet pipe, buried water inlet pipe in the utility model ground heat exchanger structure and buried outlet pipe, by diversion groove is set on inwall, improve the heat exchange efficiency of buried water inlet pipe and buried outlet pipe.Its principle is: in the time that fluid flows through solid wall surface, due to the effect of viscosity of fluid, make near the fluid of wall slow down and form flow boundary, have velocity gradient in boundary layer; When flowing during in viscous flow state in boundary layer, be called viscous flow boundary layer; In the time that the flow development in boundary layer is turbulent flow, be called turbulent boundary layer.But, even turbulent boundary layer still has one deck thin layer (viscous flow internal layer) to exist near wall place, be to remain in a standstill at this thin layer inner fluid and flow.Between viscous flow internal layer and turbulent flow main body, be called cushion.Due to fluid layering motion in viscous flow internal layer, between adjacent layer, there is no the macroscopic motion of fluid, therefore on perpendicular to flow direction, there is not thermal convection current, the party's heat transmission is upwards only that (in fact the heat of fluid conduct, heat transfer in the time that viscous flow is flowed always will be subject to the impact of free convection, makes the aggravation of conducting heat).Because the thermal conductivity factor of fluid is lower, the thermal conduction resistance that makes to remain in a standstill in internal layer is very large, and therefore in this layer, the temperature difference is larger, and thermograde is larger.In turbulent flow main body, due to the violent mixing of fluid particle and be full of whirlpool, therefore temperature difference (thermograde) performance in turbulent flow main body, temperature is basic identical everywhere.In cushion district, thermal convection current and heat conducting effect are roughly the same, and in this layer, temperature occurs to change slowly.From above principle analysis, convection heat transfer' heat-transfer by convection is that thermal-arrest convection current and heat are conducted the comprehensive phenomenon in one, and the thermal resistance of convection heat transfer' heat-transfer by convection is mainly at viscous flow internal layer; Therefore, the thickness of attenuate viscous flow internal layer is the main path of strengthening convection heat transfer' heat-transfer by convection.The heat exchange amount Q of geothermal tube heat exchanger and the effective heat exchange area F of heat exchanger, logarithm temperature difference t
mwith the product of Coefficient K value be equation, calculating formula is Q=KF Δ t
m.When heat transfer medium flows in pipe, because the little medium that makes of roughness of smooth tube wall produces the laminar flow in boundary layer when mobile, greatly lower the heat transfer effect in pipe, affected heat-transfer effect.Be directed to this, in ground heat exchanger structure of the present utility model, on the inwall of buried water inlet pipe and buried outlet pipe, along its bearing of trend, diversion groove is set, on the one hand, diversion groove has played the effect to in-pipe flow water conservancy diversion, and make the laminar flow layer attenuation of fluid by diversion groove convection cell water conservancy diversion on inwall, turbulence intensity increases, thereby increase the Coefficient K between current and tube wall, and according to the difference of diversion groove set-up mode, than the longitudinal fluting along the setting of pipeline bearing of trend to reducing fluid layer fluid layer, strengthen the effect of turbulence intensity, the helical groove of suitable pipeline bearing of trend spiral setting is except reducing fluid layer fluid layer, strengthen outside turbulence intensity, can also increase considerably current at buried water inlet pipe and the mobile perturbation of buried outlet pipe inwall, form flow-disturbing, improve the heat convection efficiency between in-pipe flow and inside pipe wall, therefore, helical groove is than the diversion groove set-up mode of longitudinal fluting, lifting amplitude to Coefficient K is larger, on the other hand, on the inwall of buried water inlet pipe and buried outlet pipe, set up diversion groove, be also equivalent to increase the heat exchange contact area F of current and tube wall, thus, the logarithm temperature difference t in in-pipe flow temperature with respect to geothermal energy resources outside managing
min certain situation, the buried water inlet pipe in the utility model ground heat exchanger structure and buried outlet pipe can obtain larger heat exchange amount Q within the unit interval, thereby heat exchange efficiency is promoted.
In order to prove diversion groove to be set to strengthen the actual effect of pipeline heat exchange efficiency on the inwall of buried water inlet pipe and buried outlet pipe in the utility model ground heat exchanger structure, the utility model has also carried out simulated experiment and has been verified.Experiment adopts length to be of a size of the incubator of 1000mm × 1000mm × 700mm and outer wall insulation, fills with soil in incubator, is not subject to the impact of outdoor environment.Experiment has used the PE pipe of three kinds of different tube wall types to carry out contrast test, be inner wall smooth PE pipe (referred to as 1# pipe), the PE pipe that is provided with longitudinal fluting along its pipeline bearing of trend on inwall (is managed referred to as 2#, the longitudinal fluting structure of inner-walls of duct as shown in Figures 2 and 3), and the PE pipe that is provided with helical groove along its pipeline bearing of trend spiral on inwall (is managed referred to as 3#, inner-walls of duct as shown in Figure 4 and Figure 5 spiral groove structured), the caliber of testing three kinds of pipelines used is DN32.When test, three kinds of pipelines, respectively through the soil horizon in incubator, ensure that inlet water temperature, flow velocity, the flow situation of three kinds of pipelines is identical.In the situation that setting in pipeline that flow rate of water flow is 0.5m/s, while testing respectively inflow temperature and be 35 DEG C and 50 DEG C, these three kinds of PE pipe leaving water temperatures and the Inlet and outlet water temperature difference are with the situation of change of running time, as shown in Table 1 and Table 2.
Table 1, inflow temperature are each pipe leaving water temperature of 35 DEG C:
Table 2, inflow temperature are each pipe leaving water temperature of 50 DEG C:
By above-mentioned contrast, can see, the in the situation that of identical running time, 2# pipe (longitudinal fluting type) and 3# pipe (helical groove type) are larger than the 1# pipe Inlet and outlet water temperature difference of inner wall smooth, illustrate under identical flow rate of water flow condition, the pipeline that inwall is provided with longitudinal fluting and helical groove has strengthened the convection heat transfer intensity of inside pipe wall and fluid, has improved heat exchange efficiency; Meanwhile, 2# pipe is compared with 3# pipe, and the in the situation that of identical running time, the 3# pipe Inlet and outlet water temperature difference is greater than 2# pipe, illustrates under identical flow rate of water flow condition, and the pipeline that inwall is provided with helical groove the is provided with longitudinal fluting heat exchange efficiency of pipeline than inwall is higher.This experimental result has also been confirmed the above-mentioned analysis to pipeline heat exchange principle and heat transfer effect of the utility model.Simultaneously, for system under running on the lower load time, due to pump variable frequency, system water flow velocity reduces (as 0.3m/s) relatively, but under the flow-disturbing effect of inner-walls of duct helical groove, its tube fluid is still in turbulent state, for the situation of high flow velocities, heat transfer effect changes less, thereby increase underground pipe high efficiency heat exchange flow velocity interval, strengthened the fluctuation accommodation of pipeline for velocity in pipes, reduced the impact of pipeline inner fluid speed heat exchanging efficiency.Certainly, theoretically, than longitudinal fluting is set, the pipeline of helical groove is set because convection cell exists flow-disturbing phenomenon, the flow resistance of fluid in pipeline can corresponding increase, and then brings pump power to a certain degree and the increase of power consumption.This just relates to the efficiency equalization problem of geothermal heat pump air-conditioning system entirety, geothermal tube heat exchanger of the present utility model specifically need to be applied in geothermal heat pump air-conditioning system, then be made a concrete analysis of.But the utility model geothermal tube heat exchanger is very obvious for the lifting effect of heat exchange property.
Be directed in the ground heat exchanger of prior art, U-shaped bend pipe easily blocks and affects the overall flow velocity of ground heat exchanger water circulation, cause the problem that geothermal tube heat exchanger service life is short, SR is large, fault rate is high, heat transfer effect is poor, in ground heat exchanger structure of the present utility model, adopt the U-shaped union elbow that improves structure.As shown in Figure 6, the bottom of this U-shaped union elbow 20 has the chamber resettling 21 that a latus rectum is greater than buried water inlet pipe and buried outlet pipe internal diameter, the latus rectum here refers to that chamber resettling allows the passage internal diameter of current circulation, one side of chamber resettling 21 is communicated to the water inlet port 22 of U-shaped union elbow by intake tunnel 24, opposite side is communicated to the water outlet port 23 of U-shaped union elbow by exhalant canal 25, the bottom surface of chamber resettling 21 is recessed cambered surface, and on chamber resettling 21 bottom surfaces near exhalant canal 25 1 sides have one from chamber resettling bottom surface upwardly extending barrier 26, the position that is positioned at chamber resettling 21 tops between intake tunnel 24 and exhalant canal 25 is also provided with communicating passage 27.The bottom of the U-shaped union elbow adopting in the utility model ground heat exchanger structure has the chamber resettling that a latus rectum is greater than buried water inlet pipe and buried outlet pipe internal diameter, this latus rectum can hold more accumulation thing compared with large chamber resettling and not get clogged, and have one from the upwardly extending barrier in chamber resettling bottom surface near exhalant canal one side on chamber resettling bottom surface, the accumulation thing that can make in chamber resettling accumulation sink is blocked wall to be stopped, prevent that the current scour that in chamber resettling, a large amount of accumulation things are flowed to exhalant canal from intake tunnel from entering buried outlet pipe and causing line clogging, moreover, even if chamber resettling's current of U-shaped union elbow are not smooth, the current that enter from intake tunnel still can be circulated to exhalant canal by communicating passage, have ensured that better in ground heat exchanger, water circulation is unimpeded, thus, make that ground heat exchanger is more difficult to be blocked, can possess longer service life, and solve well because U-shaped union elbow blocks the problem that SR is large, fault rate is high, heat transfer effect is poor causing, promote trafficability performance and the heat exchange property of ground heat exchanger.When concrete enforcement, the barrier of close exhalant canal one side on the chamber resettling bottom surface of U-shaped union elbow, preferably design its longitudinal cross-section and be up-small and down-big triangle or trapezoidal shape, to guarantee that it possesses stronger resistance to compression holding capacity, avoid in the chamber resettling of U-shaped union elbow that accumulation thing is more, flow rate of water flow causes barrier folding in situation faster and form new obturator.
As can be seen here, aspect the impact of self structure factor heat exchanging efficiency, ground heat exchanger structure of the present utility model is by the Structure Improvement of the water pipe of nuzzling over the ground, buried outlet pipe and U-shaped union elbow, alleviated the precipitating factor that reduces heat exchange efficiency by the multiple links the circulation passage proceeding to out from ground heat exchanger, extend the service life of ground heat exchanger, strengthen the heat exchange property of ground heat exchanger, thereby improved the heat exchange efficiency between ground heat exchanger in-pipe flow and geothermal energy resources.By ground heat exchanger structure applications of the present utility model in geothermal heat pump air-conditioning system, can help to improve the efficiency of geothermal heat pump air-conditioning system, reduce system energy consumption and fault rate, easily cause the problems such as geothermal heat pump air-conditioning system heat exchange efficiency is low, fault rate is higher, efficiency is lower, energy-saving benefit is not remarkable thereby effectively solve existing ground heat exchanger structure.
Finally explanation is, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049507A (en) * | 2016-07-15 | 2016-10-26 | 山东省鲁南地质工程勘察院 | Ground source well heat exchanger integrating ground temperature monitoring function and construction method of ground source well heat exchanger |
| CN109186153A (en) * | 2018-08-30 | 2019-01-11 | 珠海格力电器股份有限公司 | Unit and method and device for controlling stable operation of unit |
| CN110715564A (en) * | 2019-11-21 | 2020-01-21 | 重庆大学 | Assembled buried pipe ground source heat pump system |
| CN111237849A (en) * | 2020-01-17 | 2020-06-05 | 安徽理工大学 | Indirect heating device for abandoned mine and method for heating by adopting indirect heating device |
| CN114383332A (en) * | 2022-01-26 | 2022-04-22 | 辽宁工程技术大学 | A high-efficiency ground source heat pump buried tube heat exchanger |
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2014
- 2014-05-23 CN CN201420268311.1U patent/CN203810794U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049507A (en) * | 2016-07-15 | 2016-10-26 | 山东省鲁南地质工程勘察院 | Ground source well heat exchanger integrating ground temperature monitoring function and construction method of ground source well heat exchanger |
| CN109186153A (en) * | 2018-08-30 | 2019-01-11 | 珠海格力电器股份有限公司 | Unit and method and device for controlling stable operation of unit |
| CN109186153B (en) * | 2018-08-30 | 2023-09-08 | 珠海格力电器股份有限公司 | Unit and method and device for controlling stable operation of unit |
| CN110715564A (en) * | 2019-11-21 | 2020-01-21 | 重庆大学 | Assembled buried pipe ground source heat pump system |
| CN111237849A (en) * | 2020-01-17 | 2020-06-05 | 安徽理工大学 | Indirect heating device for abandoned mine and method for heating by adopting indirect heating device |
| CN114383332A (en) * | 2022-01-26 | 2022-04-22 | 辽宁工程技术大学 | A high-efficiency ground source heat pump buried tube heat exchanger |
| CN114383332B (en) * | 2022-01-26 | 2024-04-16 | 辽宁工程技术大学 | High-efficiency ground source heat pump buried pipe heat exchanger |
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