CN103034768B - Design method of buried heat exchange system - Google Patents
Design method of buried heat exchange system Download PDFInfo
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- CN103034768B CN103034768B CN201210570737.8A CN201210570737A CN103034768B CN 103034768 B CN103034768 B CN 103034768B CN 201210570737 A CN201210570737 A CN 201210570737A CN 103034768 B CN103034768 B CN 103034768B
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Abstract
The invention discloses a design method of a buried heat exchange system. The design method comprises the following steps of: (1) calculating a space d between buried pipe heat exchangers according to a burying region of the buried heat exchange system, and taking the space between buried pipes (1) on the outermost layer as 0.9 times of the space of the inner buried pipes during burying; (2) next calculating an equivalent heat exchange capacity design value of the buried pipe heat exchangers under the action of dynamic load according to the space d of the buried pipe heat exchangers and a rock-soil thermo-physical property parameter; and (3) calculating the depth of the buried pipes of each buried pipe heat exchanger by dividing a building load demand total value by the equivalent heat exchange capacity design value to obtain an actual depth value of the buried pipes so as to finish design of the entire buried heat exchange system. According to the design method, the heat exchange capacity design calculation of the buried pipes of a ground source heat pump system is greatly simplified, the scientificity and the rationality of the buried heat exchange system are improved, and one-time investment of the system can be reduced.
Description
Technical field
The present invention relates to a kind of method for designing of buried heat-exchange system.
Background technology
Earth-source hot-pump system is a kind of high-efficiency energy-saving air conditioning system utilizing shallow surface thermal source, has reproducible feature, can reach the object of energy-saving and emission-reduction.Earth-source hot-pump system is with Rock And Soil, underground water or surface water for low-temperature heat source, and the heat-supply metering charge be made up of system in earth source heat pump unit, geothermal energy exchange system, building forms.The difference of base area heat energy exchange system form, earth-source hot-pump system is divided into buried pipe ground-source heat pump system, groundwater heat pump system and surface water source heat pump system.
Buried heat-exchange system wherein, is that boring is buried underground vertically or flatly buried tube heat exchanger in the soil body, makes heat transfer medium by vertically or flatly buried tube heat exchanger and Rock And Soil carry out the geothermal energy exchange system of heat exchange, also known as soil source heat-exchange system.Vertical ground heat exchanger is made up of many vertical layout phases underground pipe across a certain distance.
Current China, when carrying out buried pipe ground-source heat pump system design, is for foundation with " earth-source hot-pump system engineering legislation " (GB50366-2005).This specification only proposes the requirement of " should meet heat exchange needs, spacing is preferably 3 ~ 6m " for the vertical ground heat exchanger underground pipe spacing of wells.Give tens formula that are mutually related in the heat-exchange capacity design calculation formula of specification recommends, wherein also relate to numerical integration, formulae discovery is complicated, is difficult to for engineers and technicians accept.
In Practical Project, underground pipe heat exchanger is generally by equidistant layout, and the ground such as thermal capacitance and thermal conductivity factor thermal physical property parameter is generally obtained by the relation indirect between the heat-exchange capacity of single ground heat exchanger and thermal physical property parameter.
But earth source heat pump goes wrong a lot in Practical Project at present, even run at first and just go wrong season, trace it to its cause, mostly be the heat-exchange capacity excessively high estimated under the effect of long-term dynamics load, cause the hot/cold accumulation phenomena occurred at the middle part in place in various degree, cause system can not reach energy-conservation object, time serious, can power consumption be increased on the contrary.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of method for designing of buried heat-exchange system, that takes into account the hot/cold of ground heat exchanger under the effect of long-term dynamics load and gather effect, enormously simplify the heat-exchange capacity designing and calculating of earth-source hot-pump system underground pipe, improve the science of buried heat-exchange system, reasonability, the once investment of system can be reduced.
The present invention reaches above-mentioned object, and the present invention adopts following technical scheme:
A method for designing for buried heat-exchange system, comprises the steps:
1) first calculate ground heat exchanger spacing d according to the buried region of buried heat-exchange system, and time buried, outermost layer underground pipe spacing gets 0.9 times of internally distance of embedded pipe;
2) then base area buried tube heat exchanger spacing d and ground thermal property parameter, estimated by following formula:
Q′(d,c,λ)=-0.019d
2cΔt-0.0031dc
2Δt+0.12dcΔt+0.023d
2Δt+0.011d
2cλΔt-0.052dcλΔt-0.036d
2λΔt-0.0083c
2λΔt+0.3dλΔt+0.189cλΔt
Or according to ground thermal response result of the test and computing formula: Q '=Qf (d, c, λ), calculate the equivalent heat exchange capacity design load of ground heat exchanger under dynamic load effect; Wherein Q ' (/W) is the heat-exchange capacity design load of vertical ground heat exchanger under the effect of long-term dynamics load, Q (/W) is the heat-exchange capacity design load of vertical ground heat exchanger under short term effect, the difference absolute value that Δ t (/ DEG C) is heat transfer medium in ground heat exchanger and Rock And Soil initial temperature, c (MJ/m
3k) be the volumetric heat capacity of place rock soil medium, the thermal conductivity factor that λ (W/ (mK)) is place rock soil medium, d(/m) be the arrangement pitch of ground heat exchanger;
3) then building load demand total value and equivalent heat exchange capacity design load are divided by and calculate the underground pipe degree of depth of every root ground heat exchanger, obtain the actual grade value of underground pipe, thus complete the design of whole buried heat-exchange system.
Described step 2) in ground heat exchanger equivalent heat exchange capacity design load reduction coefficient f (d, c, λ) by following formulae discovery:
f(d,c,λ)=0.146+0.00024d
2c
2-0.0034d
2c-0.0021dc
2+0.0216dc+0.005d
2+0.0005d
2cλ-0.00083dcλ-0.0021d
2λ+0.0018c
2λ+0.0089dλ-0.015cλ
Wherein c (MJ/m
3k) be the volumetric heat capacity of place rock soil medium, the thermal conductivity factor that λ (W/ (mK)) is place rock soil medium, d(/m) be the arrangement pitch of ground heat exchanger.
Beneficial effect of the present invention is: a kind of simplified design method 1) providing buried heat-exchange system, greatly facilitates the heat-exchange capacity designing and calculating of earth-source hot-pump system underground pipe; 2) give one more rational underground pipe heat exchange arrangement, the once investment of system can be reduced; 3) improve the reasonability of underground pipe depth of burying value, science.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Detailed description of the invention
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of method for designing of buried pipe ground-source heat pump system, comprises the steps:
The first, first calculate ground heat exchanger spacing d according to the buried region of buried heat-exchange system, and time buried, outermost layer underground pipe 1 spacing gets 0.9 times of internally pipe laying 2 spacing.Wherein ground heat exchanger spacing d passes through computing formula: d=L/2 (n+0.9), and should make d in 3 ~ 6m; Wherein L is the buried region area of buried heat-exchange system, and n is buried hot type row line number.
The second, then base area buried tube heat exchanger arrangement pitch d and ground thermal property parameter, estimated by following computing formula:
Q′(d,c,λ)=-0.019d
2cΔt-0.0031dc
2Δt+0.12dcΔt+0.023d
2Δt+0.011d
2cλΔt-0.052dcλΔt-0.036d
2λΔt-0.0083c
2λΔt+0.3dλΔt+0.189cλΔt
Or according to ground thermal response test and computing formula: Q '=Qf (d, c, λ), calculate the equivalent heat exchange capacity design load of ground heat exchanger under dynamic load effect; Wherein Q ' (/W) is the heat-exchange capacity design load of vertical ground heat exchanger under the effect of long-term dynamics load, Q (/W) is the heat-exchange capacity design load of vertical ground heat exchanger under short term effect, the difference absolute value that Δ t (/ DEG C) is heat transfer medium in ground heat exchanger and Rock And Soil initial temperature, c (MJ/m
3k) be the volumetric heat capacity of place rock soil medium, the thermal conductivity factor that λ (W/ (mK)) is place rock soil medium, d(/m) be the arrangement pitch of ground heat exchanger.
3rd, then building load demand total value and equivalent heat exchange capacity design load are divided by and calculate the underground pipe degree of depth of every root ground heat exchanger, obtain the actual grade value of underground pipe, thus complete the design of whole buried heat-exchange system.
Described step 2) in ground heat exchanger equivalent heat exchange capacity design load reduction coefficient f (d, c, λ) by following formulae discovery:
f(d,c,λ)=0.146+0.00024d
2c
2-0.0034d
2c-0.0021dc
2+0.0216dc+0.005d
2+0.0005d
2cλ-0.00083dcλ-0.0021d
2λ+0.0018c
2λ+0.0089dλ-0.015cλ
Wherein c (MJ/m
3k) be the volumetric heat capacity of place rock soil medium, the thermal conductivity factor that λ (W/ (mK)) is place rock soil medium, d(/m) be the arrangement pitch of ground heat exchanger.
The method for designing of a kind of buried pipe ground-source heat pump system that the present embodiment provides has following beneficial effect: a kind of simplified design method 1) providing buried heat-exchange system, greatly facilitates the heat-exchange capacity designing and calculating of earth-source hot-pump system underground pipe; 2) give a kind of reasonably underground pipe heat exchange arrangement, the once investment of system can be reduced; 3) improve the reasonability of underground pipe depth of burying value, science.
Claims (1)
1. a method for designing for buried heat-exchange system, is characterized in that comprising the steps:
1) first calculate ground heat exchanger spacing d according to the buried region of buried heat-exchange system, and time buried, outermost layer underground pipe spacing gets 0.9 times of internally distance of embedded pipe;
2) then base area buried tube heat exchanger spacing d and ground thermal property parameter, estimated by following formula:
Q′(d,c,λ)＝-0.019d
2cΔt-0.0031dc
2Δt+0.12dcΔt+0.023d
2Δt+0.011d
2cλΔt
-0.052dcλΔt-0.036d
2λΔt-0.0083c
2λΔt+0.3dλΔt+0.189cλΔt
Or according to ground thermal response result of the test and computing formula: Q '=Qf (d, c, λ), calculate the equivalent heat exchange capacity design load of ground heat exchanger under dynamic load effect; Wherein Q ', unit is W, is the heat-exchange capacity design load of vertical ground heat exchanger under the effect of long-term dynamics load; Q, unit is W, is the heat-exchange capacity design load of vertical ground heat exchanger under short term effect; Δ t, unit is DEG C, is the difference absolute value of heat transfer medium in ground heat exchanger and Rock And Soil initial temperature; C, unit is MJ/m
3k is the volumetric heat capacity of place rock soil medium; λ, unit is W/ (mK), is the thermal conductivity factor of place rock soil medium; D, unit is m, is the arrangement pitch of ground heat exchanger; Ground heat exchanger equivalent heat exchange capacity design load reduction coefficient f (d, c, λ) is by following formulae discovery:
f(d,c,λ)＝0.146+0.00024d
2c
2-0.0034d
2c-0.0021dc
2+0.0216dc+0.005d
2
+0.0005d
2cλ-0.00083dcλ-0.0021d
2λ+0.0018c
2λ+0.0089dλ-0.015cλ
Wherein c, unit is MJ/m
3k is the volumetric heat capacity of place rock soil medium; λ, unit is W/ (mK), is the thermal conductivity factor of place rock soil medium; D, unit is m, is the arrangement pitch of ground heat exchanger;
3) then building load demand total value and equivalent heat exchange capacity design load are divided by and calculate the underground pipe degree of depth of every root ground heat exchanger, obtain the actual grade value of underground pipe, thus complete the design of whole buried heat-exchange system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103968605B (en) * | 2014-04-26 | 2016-05-11 | 山东建筑大学 | The perpendicular pipe laying geothermal heat exchanger of a kind of cluster conducts heat and simplifies analytical method |
| CN107131596B (en) * | 2017-05-24 | 2019-10-22 | 哈尔滨工业大学 | A kind of power-economizing method and system being directed to communication base station refrigeration equipment using soil heat sink |
| CN107274473A (en) * | 2017-07-21 | 2017-10-20 | 山东省地质矿产勘查开发局第五地质大队（山东省第五地质矿产勘查院） | Three-dimensional numerical model for heat transfer of vertical buried pipe of ground source heat pump and establishment method thereof |
| CN112129011A (en) * | 2020-10-19 | 2020-12-25 | 贵州大学 | Calandria structure capable of relieving heat interference of horizontal buried pipe of ground source heat pump and pipe distribution method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6945734B1 (en) * | 2004-03-16 | 2005-09-20 | Gas Technology Institute | In-situ thermochemical solidification of dense non-aqueous phase liquids |
| CN102445028A (en) * | 2011-11-17 | 2012-05-09 | 西安交通大学 | Arranging method for ground heat exchanger pipe group of ground source heat pump |
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| US20110220341A1 (en) * | 2010-03-11 | 2011-09-15 | Kidwell John E | Method of and apparatus for empirically measuring the heat transfer rate of a ground heat exchanger (GHE) installation with its surrounding deep earth environment |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6945734B1 (en) * | 2004-03-16 | 2005-09-20 | Gas Technology Institute | In-situ thermochemical solidification of dense non-aqueous phase liquids |
| CN102445028A (en) * | 2011-11-17 | 2012-05-09 | 西安交通大学 | Arranging method for ground heat exchanger pipe group of ground source heat pump |
Non-Patent Citations (3)
| Title |
|---|
| A new model and analytical solutions for borehole and pile ground heat exchangers;Yi Man等;《International Journal of Heat and Mass Transfer》;20100319;第53卷(第13-14期);第2593-2601页 * |
| 土壤源热泵系统设计方法探讨;肖龙等;《建筑科学》;20121020;第28卷(第10期);第15-18页 * |
| 土壤热物性与地埋管换热器换热性能研究;凌晨等;《建筑热能通风空调》;20120415;第31卷(第2期);第15-18页 * |
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