CN114606825B - Road ice and snow melting system and method for ground source heat pump of buried pipe - Google Patents
Road ice and snow melting system and method for ground source heat pump of buried pipe Download PDFInfo
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- 238000002844 melting Methods 0.000 title claims abstract description 46
- 230000008018 melting Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 48
- 238000013461 design Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 65
- 239000012530 fluid Substances 0.000 claims description 47
- 238000005553 drilling Methods 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 229920001903 high density polyethylene Polymers 0.000 claims description 5
- 239000004700 high-density polyethylene Substances 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000011268 mixed slurry Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
- E01C11/26—Permanently installed heating or blowing devices ; Mounting thereof
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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
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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
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
-
- 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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
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- Road Paving Structures (AREA)
Abstract
The invention relates to the technical field of shallow geothermal application, in particular to an ice and snow melting system of a ground source heat pump road of a buried pipe, which comprises a ground source heat pump unit, a shallow geothermal heat exchange part structure and a heating pipeline part structure; the ground source heat pump unit is provided with a ground source side input port and a ground source side output port and is respectively connected with a heat exchange output end and a heat exchange input end of the shallow geothermal heat exchange part structure; the ground source heat pump unit is also provided with a heat supply medium output port and a heat supply medium return port; the heating pipeline part structure comprises one or more groups of pavement buried pipe groups which are arranged at intervals along the length direction of the road to be heated; the pavement ground buried pipe group comprises one or more ground buried pipes which are arranged at intervals along the width direction of the road to be heated. The road ice and snow melting method of the ground-source heat pump of the buried pipe is also disclosed; the invention has the advantages of more reasonable design and better heating the road to better finish melting ice and snow.
Description
Technical Field
The invention relates to the technical field of shallow geothermal application, in particular to a road ice and snow melting system and method for a ground source heat pump of a buried pipe.
Background
In the use of large-area open-air facilities such as mountain roads, airport runways, highways, municipal roads and the like, ice and snow weather can bring great influence, traffic is delayed if the traffic is light, and safety accidents are caused if the traffic is heavy. Therefore, the facility needs to be subjected to snow melting and thawing operation in ice and snow weather, and how to solve the problem of snow ice on roads is not only a difficult problem in China but also a difficult problem in the world.
The conventional methods are mainly divided into a passive snow melting and deicing technology and an active snow melting and deicing technology, wherein the passive snow melting and deicing technology mainly comprises a manual cleaning method, a mechanical cleaning method and a chemical snow melting method, and the methods are widely applied to road snow melting and deicing engineering in China, but have the problems of damaging road (bridge) surfaces, polluting the environment, being too high in cost, limiting using conditions and the like. The active snow melting technology mainly uses functional materials such as conductive concrete, an electric heating cable and the like to heat a road surface or a bridge deck so as to achieve the aim of melting snow and ice, wherein the electric heating cable snow melting method has the problem of compatibility with a road surface structure, and the electric heating cable surface is wrapped with a thicker insulating layer, so that the thermal efficiency is lower, and the manufacturing cost is higher; although the conductive concrete method is well combined with the pavement layer, the heating is slower, and the uniform mixing of materials is not easy to realize. In the design of the prior invention patent, the problems of high cost, incapability of carrying out design calculation, poor operability, limitation of using conditions and the like exist, and the popularization and the use are difficult.
The invention aims to overcome the defects of the prior art and provides an ice and snow melting system for a ground pipe buried ground source heat pump road, so as to solve the problem of snow accumulation and ice formation of the road.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is to provide a system and a method for melting ice and snow on a ground source heat pump road, which have a more reasonable design and can heat the road better to melt ice and snow better.
The invention provides a road ice and snow melting system of a ground-buried pipe ground source heat pump, which comprises a ground source heat pump unit, a shallow geothermal heat exchange part structure and a heating pipeline part structure; the ground source heat pump unit is provided with a ground source side input port and a ground source side output port and is respectively connected with a heat exchange output end and a heat exchange input end of the shallow geothermal heat exchange part structure; the ground source heat pump unit is also provided with a heat supply medium output port and a heat supply medium return port; the heating pipeline part structure is characterized by comprising one or more groups of pavement buried pipe groups which are arranged at intervals along the length direction of a road to be heated; the pavement ground buried pipe group comprises one or more ground buried pipes which are arranged at intervals along the width direction of a road to be heated, the ground buried pipes are bent to be U-shaped and are flatly arranged below the pavement of the road to be heated, the depth direction of the U-shaped ground buried pipes is arranged along the length direction of the road, a medium flowing space is formed inside the ground buried pipes, and two ends of the medium flowing space are respectively connected with a heating medium output port and a heating medium backflow port.
In this way, in the ground-source heat pump road ice and snow melting system with the buried pipe, the buried pipe is bent to be in a U-shaped design and is flatly laid below the road surface to be heated, and then the depth direction of the U-shaped buried pipe is arranged along the length direction of the road. And the underground heat energy heat exchange is acquired through the ground source heat pump unit and the shallow geothermal heat exchange part structure to supply the ground buried pipe. The layout of the buried pipe enables the whole road surface to be heated well to melt ice and snow, the energy consumption of the obtained ground can be reduced well, the ground is more environment-friendly, and the running cost is lower.
Further, the heating pipeline part structure comprises two pavement buried pipe groups which are arranged at intervals along the length direction of the road to be heated; each pavement buried pipe group comprises two buried pipes which are arranged at intervals along the width direction of the road to be heated. Thus, the layout is more reasonable.
As optimization, the device also comprises a first water separator and a first water collector, wherein the output port of the heating medium is connected with the input end of the first water separator, and the output end of the first water separator is connected with one end of the buried pipe; the heat supply medium reflux mouth is connected with the input end of the first water collector, and the input end of the first water collector is connected with the other end of the buried pipe.
Therefore, the first water separator and the first water collector are arranged, so that the medium output by the buried pipe can be better collected and returned to the ground source heat pump unit, and the medium can be better conveyed to the input end of the buried pipe respectively.
As optimization, the first water separator is connected with the heat supply medium output port and the first water collector is connected with the heat supply medium return port through first pipelines respectively, and a first control valve and a first circulating pump are arranged on the two first pipelines respectively.
In this way, the output and input of the medium in the buried pipe can be conveniently controlled by arranging the first control valve and the first circulating pump on the two first pipelines respectively.
As optimization, the shallow geothermal heat exchange part structure comprises one or more than one drilling holes arranged on one side of a road, and a heat exchange tube with a U-shaped structural design is arranged in each drilling hole, wherein the input end of the heat exchange tube is connected with an output port on the ground source side, and the output end of the heat exchange tube is connected with an input port on the ground source side.
Thus, by drilling and arranging the replacement heat pipe in the drill hole, the underground heat energy is used, and compared with the traditional electricity consumption, the energy is saved.
As optimization, the system also comprises a second water separator and a second water collector, wherein the input end of the second water separator is connected with the ground source side output port, and the input end of the heat exchange tube is connected with the output end of the second water separator; the output end of the second water collector is connected with the ground source side input port, and the input end of the second water collector is connected with the output end of the heat exchange tube.
Therefore, the second water separator and the second water collector are arranged, so that the connection between the heat exchange tube and the ground source side output port can be more convenient.
As optimization, the second water separator input end and the ground source side output port and the second water collector output end and the heat source input end are respectively connected through a second pipeline, and a second control valve and a second circulating pump are respectively arranged on the two second pipelines.
Thus, the circulation can be more conveniently controlled and completed by arranging the second control valve and the second circulating pump.
As optimization, the buried pipe is a high-density polyethylene PE pipe, the bearing capacity is 1.6MPA, and the pipe diameter is 25 or 32mm.
Therefore, the material selection of the buried pipe is more reasonable, and the pressure can be better borne. And the pipe diameter is selected more reasonably, the arrangement interval is more reasonable, and the road ice and snow melting work can be completed better.
As optimization, the buried pipe is paved in a concrete layer of a road, and the distance between the upper side surface of the buried pipe and the upper surface of the road is 100-200 mm; the lengths of the buried pipes are 500 to 2000m, and the vertical distance between the highest point and the lowest point of each buried pipe is smaller than 100m, and the horizontal distance between any two adjacent buried pipes is 200 to 400mm.
Therefore, the laying of the buried pipe is more reasonable, and heat can be better transferred to the road surface.
Furthermore, the buried pipes are connected in a hot melting mode. The system also comprises a machine room arranged at one side of the road, and the machine room can be arranged below the ground; the area of the machine room is 20-80m 2 The method comprises the steps of carrying out a first treatment on the surface of the The area of the machine room is determined according to the size of the host, the water collector, the circulating water pump and the like. The depth of the drilled holes is 100-200 m, the horizontal distance between the drilled holes is 3-5 m, the caliber of the drilled holes is 110-130mm, the heat exchange tube extends downwards into the drilled holes, and after the heat exchange tube extends to the bottom of the drilled holes, the heat exchange tube and the wall of the drilled holes are grouted by mixed slurry of fine sand and bentonite. The heat exchange tube adopts a high-density polyethylene PE tube with pressure bearing capacity of 1.6MPA and tube diameter of 25 or 32 tubes.
The invention also discloses a road ice and snow melting method of the ground source heat pump of the buried pipe, which is characterized in that: the road ice and snow melting system is characterized by comprising the ground pipe buried ground source heat pump road ice and snow melting system with the structure;
the lowest temperature Tn of the fluid in the road surface buried pipe when flowing out is controlled so that the fluid can release heat to the road surface and melt ice and snow when flowing through any length section of the buried pipe;
obtaining Tn by adopting a formula Tn=tm+10 (tm-tq) h/lambda h;
wherein: tn is the lowest temperature of the fluid in the heating pipe of the road pavement, and the unit is the temperature;
tm is the surface temperature of the road surface in degrees celsius;
tq is the ambient temperature in degrees celsius;
h is the distance from the center of the heating pipe to the road surface, and the unit is m.
λh is the thermal conductivity coefficient of the pavement concrete, and the unit is W/(m.K);
and when the monitored temperature is smaller than Tn, controlling to increase the temperature of the fluid entering the buried pipe or controlling to increase the flow speed of the fluid in the buried pipe until the monitored lowest temperature of the fluid in the road heating pipe is larger than or equal to Tn.
Thus, tn is calculated to be the lowest temperature of the fluid in the road heating pipe, the lowest temperature of the fluid in the road heating pipe when the fluid flows out is monitored, and when the monitored temperature is smaller than Tn, the temperature of the fluid when the fluid enters the buried pipe is controlled to be increased or the flowing speed of the fluid in the buried pipe is controlled to be increased until the lowest temperature of the fluid in the road heating pipe when the fluid flows out is monitored to be larger than or equal to Tn. Therefore, when the fluid flows through any length section of the buried pipe, the heat can be released to the road surface and the ice and snow melting work can be carried out. The ice and snow melting operation can be better performed, and the heat energy carried by the fluid can be better and fully utilized by regulating the temperature of the fluid when the fluid enters or regulating the speed of the fluid, so that the waste of energy is avoided.
Further, the total heat load Qz required for the road surface is obtained according to the formula qz=l×b×qd, where: qz is the total heat load required by the road surface, and the unit is KW;
l is the length of the road, and the unit is m;
b is the road width, and the unit is m;
qd is the heat load required by the pavement of unit area, and the unit is KW;
the total length LZ of the road heating pipe, obtained according to the formula lz=l×b/b1,
wherein: LZ is the total length of the road pavement heating pipe, and the unit is m;
b1 is the distance between the heating pipes on the road surface, and the unit is m.
Thus, the total heat load Qz required by the road surface can be calculated, and the unit can be better matched according to the obtained total heat load Qz required by the road surface, so that waste is avoided. The ground buried pipe is a U-shaped horizontal buried pipe, and the distance between the ground buried pipe and the road surface edge is the same as the distance between the ground buried pipe and the ground buried pipe, namely b 1 ，b 1 Preferably 0.2-0.4m.
Further, the total length Ls of the buried pipe is calculated according to the calculation formula: ls= kQz/Q2,
wherein: ls is the total length of the vertical buried pipe (m);
k is a coefficient, typically 1.05-1.1;
qz is the total heat load (KW) required for the road pavement;
q2 is the heat transfer capacity per linear meter (Kw/m) of the vertical buried pipe.
The number of drill holes n is calculated according to the calculation formula: n=ls/h1= kQz/h1Q2,
wherein: n is the number of drilling holes;
ls is the total length of the vertical buried pipe (m);
h1 is the effective borehole depth (m) within a single borehole.
Therefore, the total length of the buried pipe and the number of the drilled holes can be better matched, and the waste of resources is better avoided.
Drawings
Fig. 1 is a schematic structural diagram of a road ice and snow melting system with a ground pipe buried ground source heat pump according to an embodiment of the present invention.
Fig. 2 is a schematic view of the shallow geothermal heat exchange portion of fig. 1.
Fig. 3 is a schematic view of the heating pipe portion structure in fig. 1.
Detailed Description
The present invention will be further described with reference to the drawings and examples, and it should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 3, the ground source heat pump road ice and snow melting system comprises a ground source heat pump unit 1, a shallow geothermal heat exchange part structure 2 and a heating pipeline part structure 3; the ground source heat pump unit is provided with a ground source side input port and a ground source side output port and is respectively connected with a heat exchange output end and a heat exchange input end of the shallow geothermal heat exchange part structure; the ground source heat pump unit is also provided with a heat supply medium output port and a heat supply medium return port; the heating pipeline part structure comprises one or more groups of pavement buried pipe groups 5 which are arranged at intervals along the length direction of the road 4 to be heated; the pavement ground buried pipe group comprises one or more ground buried pipes 6 which are arranged at intervals along the width direction of a road to be heated, the ground buried pipes are bent to be U-shaped and are flatly arranged below the pavement of the road to be heated, the depth direction of the U-shaped ground buried pipes is arranged along the length direction of the road, a medium flowing space is formed inside the ground buried pipes, and two ends of the medium flowing space are respectively connected with a heating medium output port and a heating medium backflow port.
In this way, in the ground-source heat pump road ice and snow melting system with the buried pipe, the buried pipe is bent to be in a U-shaped design and is flatly laid below the road surface to be heated, and then the depth direction of the U-shaped buried pipe is arranged along the length direction of the road. And the underground heat energy heat exchange is acquired through the ground source heat pump unit and the shallow geothermal heat exchange part structure to supply the ground buried pipe. The layout of the buried pipe enables the whole road surface to be heated well to melt ice and snow, the energy consumption of the obtained ground can be reduced well, the ground is more environment-friendly, and the running cost is lower.
Further, the heating pipeline part structure comprises two pavement buried pipe groups which are arranged at intervals along the length direction of the road to be heated; each pavement buried pipe group comprises two buried pipes which are arranged at intervals along the width direction of the road to be heated. Thus, the layout is more reasonable.
In the specific embodiment, the device also comprises a first water separator 7 and a first water collector 8, wherein a heating medium output port is connected with the input end of the first water separator, and the output end of the first water separator is connected with one end of the buried pipe; the heat supply medium reflux mouth is connected with the input end of the first water collector, and the input end of the first water collector is connected with the other end of the buried pipe.
Therefore, the first water separator and the first water collector are arranged, so that the medium output by the buried pipe can be better collected and returned to the ground source heat pump unit, and the medium can be better conveyed to the input end of the buried pipe respectively.
In this embodiment, the first water separator is connected to the heat supply medium outlet and the first water collector is connected to the heat supply medium return port through the first pipes 9, and the first control valve 10 and the first circulating pump 11 are respectively disposed on the two first pipes.
In this way, the output and input of the medium in the buried pipe can be conveniently controlled by arranging the first control valve and the first circulating pump on the two first pipelines respectively.
In this embodiment, the shallow geothermal heat exchange part structure includes one or more drill holes 12 disposed at one side of the road, and a heat exchange tube 13 with a U-shaped structural design is disposed in the drill hole, where an input end of the heat exchange tube is connected to an output port at the ground source side, and an output end of the heat exchange tube is connected to an input port at the ground source side.
Thus, by drilling and arranging the replacement heat pipe in the drill hole, the underground heat energy is used, and compared with the traditional electricity consumption, the energy is saved.
In the specific embodiment, the water separator also comprises a second water separator 14 and a second water collector 15, wherein the input end of the second water separator is connected with the ground source side output port, and the input end of the heat exchange tube is connected with the output end of the second water separator; the output end of the second water collector is connected with the ground source side input port, and the input end of the second water collector is connected with the output end of the heat exchange tube.
Therefore, the second water separator and the second water collector are arranged, so that the connection between the heat exchange tube and the ground source side output port can be more convenient.
In this embodiment, the second water separator input end and the ground source side output port and the second water collector output end and the heat source input end are respectively connected through a second pipeline 16, and a second control valve 17 and a second circulating pump 18 are respectively arranged on the two second pipelines.
Thus, the circulation can be more conveniently controlled and completed by arranging the second control valve and the second circulating pump.
In the specific embodiment, the buried pipe is a high-density polyethylene PE pipe, the bearing capacity is 1.6MPA, and the pipe diameter is 25 or 32mm.
Therefore, the material selection of the buried pipe is more reasonable, and the pressure can be better borne. And the pipe diameter is selected more reasonably, the arrangement interval is more reasonable, and the road ice and snow melting work can be completed better.
In the concrete implementation mode, the buried pipe is paved in a concrete layer of a road, and the distance between the upper side surface of the buried pipe and the upper surface of the road is 100-200 mm; the lengths of the buried pipes are 500 to 2000m, and the vertical distance between the highest point and the lowest point of each buried pipe is smaller than 100m, and the horizontal distance between any two adjacent buried pipes is 200 to 400mm.
Therefore, the laying of the buried pipe is more reasonable, and heat can be better transferred to the road surface.
Furthermore, the buried pipes are connected in a hot melting mode. The system also comprises a machine room arranged at one side of the road, and the machine room can be arranged below the ground; the area of the machine room is 20-80m 2 The method comprises the steps of carrying out a first treatment on the surface of the The area of the machine room is determined according to the size of the host, the water collector, the circulating water pump and the like. The depth of the drilled holes is 100-200 m, the horizontal distance between the drilled holes is 3-5 m, the caliber of the drilled holes is 110-130mm, the heat exchange tube extends downwards into the drilled holes, and after the heat exchange tube extends to the bottom of the drilled holes, the heat exchange tube and the wall of the drilled holes are grouted by mixed slurry of fine sand and bentonite. The heat exchange tube adopts a high-density polyethylene PE tube with pressure bearing capacity of 1.6MPA and tube diameter of 25 or 32 tubes.
The invention also discloses a road ice and snow melting method of the ground source heat pump of the buried pipe, which is characterized in that: the road ice and snow melting system is characterized by comprising the ground pipe buried ground source heat pump road ice and snow melting system with the structure;
the lowest temperature Tn of the fluid in the road surface buried pipe when flowing out is controlled so that the fluid can release heat to the road surface and melt ice and snow when flowing through any length section of the buried pipe;
obtaining Tn by adopting a formula Tn=tm+10 (tm-tq) h/lambda h;
wherein: tn is the lowest temperature of the fluid in the heating pipe of the road pavement, and the unit is the temperature;
tm is the surface temperature of the road surface in degrees celsius;
tq is the ambient temperature in degrees celsius;
h is the distance from the center of the heating pipe to the road surface, and the unit is m.
λh is the thermal conductivity coefficient of the pavement concrete, and the unit is W/(m.K);
and when the monitored temperature is smaller than Tn, controlling to increase the temperature of the fluid entering the buried pipe or controlling to increase the flow speed of the fluid in the buried pipe until the monitored lowest temperature of the fluid in the road heating pipe is larger than or equal to Tn.
Thus, tn is calculated to be the lowest temperature of the fluid in the road heating pipe, the lowest temperature of the fluid in the road heating pipe when the fluid flows out is monitored, and when the monitored temperature is smaller than Tn, the temperature of the fluid when the fluid enters the buried pipe is controlled to be increased or the flowing speed of the fluid in the buried pipe is controlled to be increased until the lowest temperature of the fluid in the road heating pipe when the fluid flows out is monitored to be larger than or equal to Tn. Therefore, when the fluid flows through any length section of the buried pipe, the heat can be released to the road surface and the ice and snow melting work can be carried out. The ice and snow melting operation can be better performed, and the heat energy carried by the fluid can be better and fully utilized by regulating the temperature of the fluid when the fluid enters or regulating the speed of the fluid, so that the waste of energy is avoided.
Examples: the distance from the center of the buried pipe to the road surface is 0.18 m, and the heat conductivity coefficient of the pavement concrete is 1.5W +.
(m.K) the road surface temperature is not lower than 1 ℃, the minimum temperature in the pipe is 8.2 ℃ when the ambient temperature is minus 5 ℃ and is 14.2 ℃ when the ambient temperature is minus 10 ℃ when the ambient temperature is minus 5 ℃ by the calculation of the formula.
The formula is that the lower limit value of the fluid temperature in the buried pipe of the road surface is approximately calculated, and the lowest temperature of the fluid in the buried pipe of the road surface cannot be lower than T n Otherwise, the effect of melting ice and snow is not achieved. Typically, the minimum temperature T in the tube n Is also the return water temperature of the buried pipe. Minimum temperature T of fluid in buried pipe n Can enter through the water outlet temperature (water inlet temperature of a buried pipe), the flow velocity in the pipe and the like of the ground source heat pump unitRow adjustment. The heat dissipation capacity of the heating pipe, namely the heat load required by the road surface, can be calculated through the temperature difference of the water inlet temperature and the water return temperature of the buried pipe, the flow and other parameters, and the heat load required by the road surface in field test or numerical simulation analysis is checked. The temperature of the water entering and returning of the buried pipe is displayed or stored in real time through a thermometer (or a temperature sensor) arranged on the pavement side water dividing and collecting device.
Further, the total heat load Qz required for the road surface is obtained according to the formula qz=l×b×qd, where: qz is the total heat load required by the road surface, and the unit is KW;
l is the length of the road, and the unit is m;
b is the road width, and the unit is m;
qd is the heat load required by the pavement of unit area, and the unit is KW;
the total length LZ of the road heating pipe, obtained according to the formula lz=l×b/b1,
wherein: LZ is the total length of the road pavement heating pipe, and the unit is m;
b1 is the distance between the heating pipes on the road surface, and the unit is m.
Thus, the total heat load Qz required by the road surface can be calculated, and the unit can be better matched according to the obtained total heat load Qz required by the road surface, so that waste is avoided. The ground buried pipe is a U-shaped horizontal buried pipe, and the distance between the ground buried pipe and the road surface edge is the same as the distance between the ground buried pipe and the ground buried pipe, namely b 1 ，b 1 Preferably 0.2-0.4m.
Further, the total length Ls of the buried pipe is calculated according to the calculation formula: ls= kQz/Q2,
wherein: ls is the total length of the vertical buried pipe (m);
k is a coefficient, usually 1.05-1.1;
qz is the total heat load (KW) required for the road pavement;
q2 is the heat transfer capacity per linear meter (Kw/m) of the vertical buried pipe.
The number of drill holes n is calculated according to the calculation formula: n=ls/h1= kQz/h1Q2,
wherein: n is the number of drilling holes;
ls is the total length of the vertical buried pipe (m);
h1 is the effective borehole depth (m) within a single borehole.
Therefore, the total length of the buried pipe and the number of the drilled holes can be better matched, and the waste of resources is better avoided.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. A road ice and snow melting method of a ground source heat pump of a buried pipe is characterized in that: the method is realized by adopting the following ground pipe buried ground source heat pump road ice and snow melting system; the system comprises a ground source heat pump unit, a shallow geothermal heat exchange part structure and a heating pipeline part structure; the ground source heat pump unit is provided with a ground source side input port and a ground source side output port and is respectively connected with a heat exchange output end and a heat exchange input end of the shallow geothermal heat exchange part structure; the ground source heat pump unit is also provided with a heat supply medium output port and a heat supply medium return port; the heating pipeline part structure comprises one or more groups of pavement buried pipe groups which are arranged at intervals along the length direction of a road to be heated; the pavement ground buried pipe group comprises one or more ground buried pipes which are arranged at intervals along the width direction of a road to be heated, the ground buried pipes are bent to be U-shaped and are flatly arranged below the pavement of the road to be heated, the depth direction of the U-shaped ground buried pipes is arranged along the length direction of the road, a medium flowing space is formed inside the ground buried pipes, and two ends of the medium flowing space are respectively connected with a heating medium output port and a heating medium backflow port; the heating pipeline part structure comprises two road surface buried pipe groups which are arranged at intervals along the length direction of a road to be heated; each pavement buried pipe group comprises two buried pipes which are arranged at intervals along the width direction of the road to be heated;
the lowest temperature Tn of the fluid in the road surface buried pipe when flowing out is controlled so that the fluid can release heat to the road surface and melt ice and snow when flowing through any length section of the buried pipe;
obtaining Tn by adopting a formula Tn=tm+10 (tm-tq) h/lambda h;
wherein: tn is the lowest temperature of the fluid in the heating pipe of the road pavement, and the unit is the temperature;
tm is the surface temperature of the road surface in degrees celsius;
tq is the ambient temperature in degrees celsius;
h is the distance from the center of the heating pipe to the road surface, and the unit is m.
λh is the thermal conductivity coefficient of the pavement concrete, and the unit is W/(m.K);
when the monitored temperature is smaller than Tn, controlling to increase the temperature of the fluid entering the buried pipe or controlling to increase the flow speed of the fluid in the buried pipe until the monitored lowest temperature of the fluid in the road heating pipe is larger than or equal to Tn;
the total heat load Qz required for the road surface is obtained according to the formula qz=l×b×qd, where: qz is the total heat load required by the road surface, and the unit is KW;
l is the length of the road, and the unit is m;
b is the road width, and the unit is m;
qd is the heat load required by the pavement of unit area, and the unit is KW;
the total length LZ of the road heating pipe, obtained according to the formula lz=l×b/b1,
wherein: LZ is the total length of the road pavement heating pipe, and the unit is m;
b1 is the distance between the heating pipes on the road surface, and the unit is m.
2. The method for melting ice and snow on the ground-source heat pump road of the buried pipe as set forth in claim 1, wherein the method comprises the steps of: the device also comprises a first water separator and a first water collector, wherein the output end of the heating medium is connected with the input end of the first water separator, and the output end of the first water separator is connected with one end of the buried pipe; the heat supply medium reflux mouth is connected with the input end of the first water collector, and the input end of the first water collector is connected with the other end of the buried pipe.
3. The method for melting ice and snow on the ground-source heat pump road with the buried pipe as set forth in claim 2, wherein the method comprises the steps of: the first water separator is connected with the heat supply medium output port and the first water collector is connected with the heat supply medium return port through first pipelines respectively, and a first control valve and a first circulating pump are arranged on the two first pipelines respectively.
4. The method for melting ice and snow on the ground-source heat pump road of the buried pipe as set forth in claim 1, wherein the method comprises the steps of: the shallow geothermal heat exchange part structure comprises one or more than one drilling holes arranged on one side of a road, and a heat exchange tube with a U-shaped structural design is arranged in each drilling hole, wherein the input end of the heat exchange tube is connected with an output port on the ground source side, and the output end of the heat exchange tube is connected with an input port on the ground source side.
5. The method for melting ice and snow on the ground-source heat pump road with the buried pipe as set forth in claim 4, wherein the method comprises the following steps: the heat exchange pipe is connected with the output end of the second water separator; the output end of the second water collector is connected with the ground source side input port, and the input end of the second water collector is connected with the output end of the heat exchange tube.
6. The method for melting ice and snow on the ground-source heat pump road with the buried pipe as set forth in claim 5, wherein the method comprises the following steps: the second water separator input end is connected with the ground source side output port and the second water collector output end is connected with the heat source input end through a second pipeline respectively, and a second control valve and a second circulating pump are arranged on the two second pipelines respectively.
7. The method for melting ice and snow on the ground-source heat pump road of the buried pipe as set forth in claim 1, wherein the method comprises the steps of: the buried pipe is a high-density polyethylene PE pipe, the bearing capacity is 1.6MPA, and the pipe diameter is 25 or 32mm.
8. The method for melting ice and snow on the ground-source heat pump road of the buried pipe as set forth in claim 1, wherein the method comprises the steps of: the buried pipe is paved in a concrete layer of the road, and the distance between the upper side surface of the buried pipe and the upper surface of the road is 100-200 mm; the length of the buried pipe is 500 to 2000m, and the vertical distance between the highest point and the lowest point of the single buried pipe is less than 100m.
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