CN109946103A - A kind of underground heat parameter test system and method based on mid-deep strata ground heat exchanger - Google Patents
A kind of underground heat parameter test system and method based on mid-deep strata ground heat exchanger Download PDFInfo
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Abstract
The present disclosure proposes a kind of underground heat parameter test systems and method based on mid-deep strata ground heat exchanger, belong to geothermics and geothermal energy utilization technical field.The disclosure is using mid-deep strata ground heat exchanger as main technology platforms, the temperature versus time curve of test loop water under zero load state, based on mid-deep strata heat transfer model of ground heat exchangers, solve Inverse Heat Conduction Problem Analysis, determine local terrestrial heat flow and foot of hole temperature, and can lead in turn stratum thermal physical property parameter.The disclosure can provide necessary ground thermal parameter for mid-deep strata ground source heat pump technology and by the heat storage technology of heat storage medium of underground ground, also provide a substitution method for measurement terrestrial heat flow.
Description
Technical field
This disclosure relates to geothermal energy utilization correlative technology field, in particular to a kind of be based on mid-deep strata underground pipe
The underground heat parameter test system and method for heat exchanger.
Background technique
Only there is provided background technical informations relevant to the disclosure for the statement of this part, not necessarily constitute first
Technology.
Ground-source heat pump system makes the earth become heat pump system by constituting ground heat exchanger in embedded underground pipeline
Heat source meets building cooling in summer, winter for the needs of warm supply domestic hot-water, can effectively improve non-renewable energy
Utilization rate reduces the discharge of greenhouse gases CO2 and other pollutants, is a new skill of energy conservation using renewable energy
Art.
Pipe laying depth is usually 80-150m in traditional shallow-layer ground heat exchanger system, therefore ground-source heat pump system
Or hold over system needs to occupy a large amount of soil, becomes the major obstacle for promoting and applying these power-saving technologies；In addition, these are shallow
The temperature of layer ground is usually less than 20 DEG C, also affects the efficiency of ground-source heat pump system or hold over system.In developing in recent years
The depth of traditional vertical buried pipe is increased to 1500-2500m by deep layer ground heat exchanger technology, and the temperature of foot of hole can
Up to 40-90 DEG C, solves the shallow-layer ground heat exchanger land occupation mostly low disadvantage with ground temperature.
Since the earth's core of high temperature continually radiates to earth's surface, terrestrial heat flow is thus generated, is also caused in this stratum more
Toward the higher phenomenon of depths temperature.Terrestrial heat flow, also referred to as Heat flow refer in per area per time by the earth
Inside is transmitted to the heat of earth's surface along vertical direction.
In the analysis of Heat Transfer of shallow-layer ground heat exchanger, the temperature change in the depth of stratum direction being related to only has 2-3
DEG C, therefore all ignore the temperature change of this depth direction in related specifications and engineering practice at home and abroad, and assume ground
Temperature when undisturbed in layer is uniform.This also means that ignoring the influence of terrestrial heat flow.It exchanges heat in mid-deep strata underground pipe
The temperature difference above and below drilling in device becomes one of the deciding factor for influencing its performance up to 25-75 DEG C, therefore in mid-deep strata
The local terrestrial heat flow that drills in the analysis of Heat Transfer of buried tube heat exchanger cannot be ignored, and be that its performance evaluation and design calculate
Necessary basis data.
In addition, the thermal response for shallow ground source heat pump ground heat exchanger is tested, it is all directed to shallow ground source heat pump system
The depth of system, underground pipe is no more than 150m, therefore the influence of terrestrial heat flow and geothermal gradient, mesh are all had ignored in these methods
Only acquire the mean coefficient of heat conductivity on stratum, it is of course impossible to be related to the concept of terrestrial heat flow.Terrestrial heat flow is mid-deep strata
The call parameter of thermal energy application analysis of Heat Transfer, therefore be that cannot expire completely using the method for shallow ground source Heat Pump response test
The analysis of Heat Transfer of sufficient mid-deep strata ground heat exchanger, design and the requirement of operation.It is basic that the method followed by tested also has
It is different.The existing patented method about shallow ground source heat pump system thermal response test all must be with hot (cold) source, usually
Heating element or heat pump.
The terrestrial heat flow value of various regions is influenced by factors such as geological structures, can there is biggish difference.Measurement and accumulation are each
The distributed data of ground terrestrial heat flow is the basic work of National Geology and geothermal survey, and current mid-deep strata geothermal utilization
In problem in the urgent need to address.But determine that the terrestrial heat flow of a locality is a difficulty and the work to cost dearly
Make.Correlative study and few in terms of terrestrial heat flow, the distribution of mid-deep strata ground temperature and rock-soil layer thermal physical property parameter are tested.Its
In, application No. is: 201610021294.5, patent name are as follows: a kind of segmented geothermal gradient based on unconformity is quasi-
Conjunction method, which disclose a kind of segmented geothermal gradient approximating method based on unconformity, this method is not according to
With area stratum development characteristics, it is independently fitted geothermal gradient up and down in geothermal gradient critical surface, to obtain difference up and down
Stratum geothermal gradient can really reflect the Geothermal Characteristics on the old and new stratum, be that oil gas and underground geothermal resource exploration develop and use
Reliable basis is provided.But special drilling well is needed to determine the spread and buried depth of wellblock earth formation, unconformity.
The complexity and Gao Chengben tested just because of mid-deep strata terrestrial heat flow and stratum thermal physical property parameter, Chinese wide
On big territory, there was only the terrestrial heat flow value of about 1200 data points until 2015, and Area distribution is very uneven, much
The needs for not adapting to survey of territorial resources and research, it is even more impossible to meet the urgent of mid-deep strata ground heat exchanger engineer application
It is required that.
Summary of the invention
The disclosure to solve the above-mentioned problems, proposes a kind of ground thermal parameter survey based on mid-deep strata ground heat exchanger
Test system and method construct underground heat parameter test system based on mid-deep strata ground heat exchanger, the mid-deep strata underground pipe in system
Heat exchanger can be used as a part of test macro, can also be used as the heat source of ground-source heat pump system or hold over system, improve
The utilization rate of mid-deep strata ground heat exchanger, reduces the expense of test.Only connect mid-deep strata underground pipe in testing simultaneously
Heat exchanger and test device do not have any heating element in test device, and have cut off and ground-source heat pump system or accumulation of heat
The connection of system realizes the zero load operation of mid-deep strata ground heat exchanger, and the variation of circulating liquid temperature can be true
Corresponsively thermal parameter, so that the underground heat supplemental characteristic obtained is more accurate.
To achieve the goals above, the disclosure adopts the following technical scheme that
One or more embodiments provide a kind of underground heat parameter test system based on mid-deep strata ground heat exchanger,
Including mid-deep strata ground heat exchanger, water inlet valve group, water outlet valve group and test device, the water inlet valve group connection mid-deep strata
The water inlet end of buried tube heat exchanger, the water outlet of water outlet valve group connection mid-deep strata ground heat exchanger, inlet valve group are separately connected survey
Trial assembly is set and heat pump system, and outlet valve group distinguishes connecting test device and heat pump system；The underground heat parameter testing stage is being carried out,
Water outlet valve group connects test device and mid-deep strata ground heat exchanger with water inlet valve group, and heat pump system is bypassed；It is not at test
When the stage, water outlet valve group connects heat pump system and mid-deep strata ground heat exchanger with water inlet valve group, provides heat for heat pump system
Source.
The test device includes the test pipeline, circulating pump, flowmeter, temperature connecting with mid-deep strata ground heat exchanger
Sensor and controller are spent, circulating pump, flowmeter and temperature sensor setting are changed on test pipeline in mid-deep strata underground pipe
Be provided at least one temperature sensor at the water inlet end of hot device and at water outlet, the controller respectively with flowmeter and
Temperature sensor connection.
Further, the mid-deep strata ground heat exchanger is sleeve type structure, including inner and outer tubes, outer tube nozzle
For water inlet end, inner tube nozzle is water outlet, there is backfilling material layer outside the outer tube.
Further, the outer tube is steel pipe；Or/and said inner tube is for the plastic tube of low heat conductivity or with thermal insulation layer
Multiple tube.
Further, the depth of the mid-deep strata ground heat exchanger is greater than 1500m.
Further, the water outlet valve group is outlet three way valve, the connection mid-deep strata of the water inlet end of the outlet three way valve
The water outlet of ground heat exchanger water outlet, the outlet three way valve is separately connected test device and heat pump system.
Further, the water inlet valve group is inlet triplet for water valve, and the mid-deep strata of the water outlet of the inlet triplet for water valve is buried
The water inlet end of heat exchange of heat pipe water inlet end, the inlet triplet for water valve is separately connected test device and heat pump system.
Based on a kind of test method of above-mentioned underground heat parameter test system based on mid-deep strata ground heat exchanger, packet
Include following steps:
It is filled with recirculated water, is restored to undisturbed state to the ground temperature around mid-deep strata ground heat exchanger；
The temperature of unlocking testing device, acquisition mid-deep strata ground heat exchanger in-out end recirculated water changes with time number
According to and data on flows；
Establish the Calculation of Heat Transfer model of mid-deep strata bushing type ground heat exchanger diabatic process；
The Calculation of Heat Transfer model that mid-deep strata ground heat exchanger is solved using numerical computation method, is acquired according in test
Data solve the Calculation of Heat Transfer model indirect problem of mid-deep strata ground heat exchanger, obtain local terrestrial heat flow and drilling bottom
Portion's temperature；
The thermal physical property parameter on stratum is determined according to the local terrestrial heat flow and foot of hole temperature of acquisition.
Further, the method tool of the Calculation of Heat Transfer model of mid-deep strata bushing type ground heat exchanger diabatic process is established
Body are as follows:
Step 31, the heat conduction governing equation for establishing rock-soil layer respectively, casing outer tube circulation fluid temperature governing equation and set
The governing equation of pipe inner tube circulation fluid temperature；
Step 32, the governing equation primary condition in given step 31 and boundary condition.
Further, the Calculation of Heat Transfer model that mid-deep strata ground heat exchanger is solved using numerical computation method, root
The Calculation of Heat Transfer model indirect problem that mid-deep strata ground heat exchanger is solved according to the data acquired in test obtains local the earth
The step of hot-fluid and foot of hole temperature, specifically:
It is step 41, poor accordingly using each governing equation of the finite difference calculus under circular cylindrical coordinate in establishment step 31
Divide equation group；
Step 42 solves DIFFERENCE EQUATIONS using chasing method, obtains theoretical model calculated value；
Step 43, according to the out temperature response data of acquisition and the theoretical model calculated value of acquisition, it is anti-to solve heat transfer
Problem determines terrestrial heat flow and foot of hole temperature value.
Further, the ground temperature around the mid-deep strata ground heat exchanger is restored to undisturbed state, is
Meet any one condition in the following conditions:
Mid-deep strata ground heat exchanger completes construction 30 days or more of drilling, down tube and backfill, and keeps recovery state not
By thermal perturbation；
Mid-deep strata ground heat exchanger is completed after last zero load test run leisure 10 days or more, and is kept
Recovery state is not by thermal perturbation；
Mid-deep strata ground heat exchanger lies fallow 90 days or more after the heat supply or regenerative operation for completing a upper season, and protects
Recovery state is held not by thermal perturbation.
Compared with prior art, the disclosure has the beneficial effect that
(1) only one as test macro in test of the mid-deep strata ground heat exchanger in disclosure test macro
Point, heat pump system or hold over system are connected in without testing time section and provides heat source for it, avoid mid-deep strata underground pipe
Heat exchanger is idle to be caused to waste, and is greatly reduced the cost of underground heat parameter testing, is improved the benefit of mid-deep strata ground heat exchanger
With rate.In the non-test stage, mid-deep strata ground heat exchanger will be generated as the heat source of ground-source heat pump system or hold over system
Lasting economy and environmental benefit substantially increases the economy of construction mid-deep strata ground heat exchanger.
(2) disclosure only connects mid-deep strata ground heat exchanger and test device, test device in underground heat parameter testing
In there is no any heating element, and cut off ground-source heat pump system or hold over system, realized the heat exchange of mid-deep strata underground pipe
The zero load of device is run, the variation of temperature can true corresponsively thermal parameter, so that the underground heat supplemental characteristic obtained is more quasi-
Really.The simple testing process of the disclosure puts into the shorter testing time, probably needs 6-10 hours, high accuracy may be implemented
Mid-deep strata underground heat parameter testing.
(3) the mid-deep strata ground heat exchanger of the disclosure can use sleeve type structure, and shape comparison rule is easier to
Heat transfer model is established, the finite difference method heat transfer model of use realizes efficient calculating, it is big can to simplify mid-deep strata
Geothermal heat flow and the test of stratum thermal physical property parameter and analysis.
Detailed description of the invention
The Figure of description for constituting a part of this disclosure is used to provide further understanding of the disclosure, the disclosure
Illustrative embodiments and their description do not constitute the restriction to the disclosure for explaining the disclosure.
Fig. 1 is the structural schematic diagram according to the system of one or more embodiments；
Wherein: 1, circulating pump, 2, flowmeter, 3, temperature sensor, 4, inner tube, 5, outer tube, 6, backfilling material layer, 7, change
Hot device surrounding formation, 8, test pipeline, 9, water outlet valve group, 10, water inlet valve group, 11, heat pump system.
Specific embodiment:
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that described further below be all exemplary, it is intended to provide further instruction to the disclosure.Unless
Otherwise indicated, all technical and scientific terms used herein has and disclosure person of an ordinary skill in the technical field
Normally understood identical meanings.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the disclosure.As used herein, unless the context clearly indicates otherwise, otherwise singular shape
Formula be also intended to include plural form, additionally, it should be understood that, when in the present specification use term "comprising" and/or
When " comprising ", existing characteristics, step, operation, device, component and/or their combination are indicated.It should be noted that not
In the case where conflict, the feature in embodiment and embodiment in the disclosure be can be combined with each other.Below in conjunction with attached drawing to reality
Example is applied to be described in detail.
In the technical solution disclosed in one or more embodiments, as shown in Figure 1, a kind of buried based on mid-deep strata
The underground heat parameter test system of heat exchange of heat pipe, including mid-deep strata ground heat exchanger, water inlet valve group 10 and water outlet valve group 9, it is described
Valve group 10 of intaking connects the water inlet end of mid-deep strata ground heat exchanger, and water outlet valve group 9 connects going out for mid-deep strata ground heat exchanger
Water end (W.E.), water inlet valve group 10 are separately connected test device and heat pump system 11, and water outlet valve group 9 is separately connected test device and heat pump
System 11；It is carrying out the underground heat parameter testing stage, water outlet valve group connects test device with water inlet valve group and mid-deep strata underground pipe changes
Hot device, heat pump system are bypassed；When being not at test phase, water outlet valve group connects heat pump system and mid-deep strata with water inlet valve group
Ground heat exchanger provides heat source for heat pump system.
Heat pump system may include the arbitrary system of heat pump in the present embodiment, can be ground-source heat pump system and accumulation of heat system
System, ground-source heat pump system are to be exchanged using Rock And Soil, underground water or surface water as low-temperature heat source by water source heat pump units, geothermal energy
The heat-supply metering charge that system forms in system, building.It builds mid-deep strata ground heat exchanger and needs biggish initial cost,
Mid-deep strata ground heat exchanger in the present embodiment test macro can be used as a part of test macro, without test
Connection heat pump system 11 provides heat source for it in period, avoids mid-deep strata ground heat exchanger is idle from causing to waste, mentions
The high utilization rate of mid-deep strata ground heat exchanger, improves the utilization rate of non-renewable energy.Stage without test can incite somebody to action
Mid-deep strata ground heat exchanger connects in ground-source heat pump system 11 or hold over system, mid-deep strata ground heat exchanger and heat pump or
The heat exchanger of other forms is connected, and is formed closed loop and is provided heat source.
The test device include the test pipeline 8 being connect with mid-deep strata ground heat exchanger, circulating pump 1, flowmeter 2,
Temperature sensor 3 and controller, circulating pump 1, flowmeter 2 and the setting of temperature sensor 3 are on test pipeline 8, in mid-deep strata
Be provided at least one temperature sensor 3 at the water inlet end of buried tube heat exchanger and at water outlet, the controller respectively with stream
Meter and temperature sensor 3 connect.
Flowmeter 2 and temperature sensor 3 can be connected to controller by data collector.
The work of circulating pump 1 can be driven by driving motor, and circulating pump driving motor can use variable-frequency motor, with
Circulating pump is driven to adjust the flow of recirculated water.The data on flows of 2 collecting test pipeline of flowmeter, and send data to control
Device, controller store the data of acquisition, and pump driving motor work according to the data on flows control loop of acquisition, so that stream
Amount is within the set range.The water inlet end of mid-deep strata ground heat exchanger is set and the temperature sensor 3 at water outlet is examined respectively
The leaving water temperature data for the inflow temperature that changes with time are surveyed, and the temperature data that will test is transmitted to controller, controller will
Data storage and display.The concrete model of the controller can be STC15W408 single-chip microcontroller.
Mid-deep strata ground heat exchanger and test device are only connected in underground heat parameter testing, are not appointed in test device
What heating element, and ground-source heat pump system or hold over system have been cut off, realize mid-deep strata ground heat exchanger zero is negative
Lotus operation, the variation of temperature can true corresponsively thermal parameter, so that the underground heat supplemental characteristic obtained is more accurate.
As a further improvement, mid-deep strata ground heat exchanger can use sleeve type structure, including inner tube 4 and outer
Pipe 5, outer tube nozzle are water inlet end, and it is backfilling material layer 6 outside the outer tube that inner tube nozzle, which is water outlet,.Backfilling material layer 6 is set
It sets among mid-deep strata ground heat exchanger and heat exchanger surrounding formation 7.It is followed in the mid-deep strata ground heat exchanger of the present embodiment
Ring medium (such as recirculated water) flows into inner tube 4 from outer tube 5 and flows out, the structure of bushing type, convenient construction, shape comparison rule, and
It is easier to establish heat transfer model, is capable of the analysis of simplifiedly thermal parameter.
Outer tube 5 can use steel pipe, and 4 tube wall of inner tube should have good heat-proof quality, and low heat conductivity can be used in inner tube 4
Plastic tube or multiple tube with thermal insulation layer.The depth of drilling pipe laying is typically now 1500-2500m；In technology and economy
Under conditions of permission, deeper depth can also be used.Pure water can be used in circulatory mediator in mid-deep strata ground heat exchanger.
As a further improvement, selection mid-deep strata ground heat exchanger carries out test and also sets up connection earth source heat pump system
The switching device of system, the switching device are arbitrary switch device, can be device manually or automatically, the present embodiment
Switching device is water outlet valve group 9 and water inlet valve group 10, and water outlet valve group 9 and the valve that valve group 10 is arranged of intaking can be hand-operated valve
Door is solenoid valve, specifically can be triple valve.The water outlet valve group 9 is outlet three way valve, the outlet three way valve
The connection mid-deep strata ground heat exchanger water outlet of water inlet end, the water outlet of the outlet three way valve is separately connected test device
With heat pump system 11.The water inlet valve group 10 is inlet triplet for water valve, and the water outlet connection mid-deep strata of the inlet triplet for water valve is buried
The water inlet end of heat exchange of heat pipe water inlet end, the inlet triplet for water valve is separately connected test device and heat pump system 11.In the present embodiment
Triple valve can use the replacement of two valves, replace triple valve to connect to form that triple valve can be connected two using two valves
A branch.It can connect controller when the triple valve of the present embodiment setting is solenoid valve, three can be controlled by setting button
The on state of port valve.
Embodiment 2
The present embodiment provides a kind of based on a kind of ground physochlaina infudibularis based on mid-deep strata ground heat exchanger described in embodiment 1
The test method of number test macro, includes the following steps:
Step 1 is filled with recirculated water, is restored to the ground temperature around mid-deep strata ground heat exchanger undisturbed
State；Recirculated water can use pure water.
Ground temperature around mid-deep strata ground heat exchanger is restored to undisturbed state, is filled with recirculated water, connects
Logical mid-deep strata ground heat exchanger and test device.
Ground temperature around mid-deep strata ground heat exchanger is restored to undisturbed state, can be following to meet
Any one condition in condition:
1. mid-deep strata ground heat exchanger completes construction 30 days or more of drilling, down tube and backfill, and keeps recovery state
Not by thermal perturbation.
2. mid-deep strata ground heat exchanger is completed after last zero load test run leisure 10 days or more, and is protected
Recovery state is held not by thermal perturbation.
3. mid-deep strata ground heat exchanger lies fallow 90 days or more after the heat supply or regenerative operation for completing a upper season, and
Keep recovery state not by thermal perturbation.
Mid-deep strata ground heat exchanger and test device are only connected in testing, do not have any heating unit in test device
Part, and ground-source heat pump system or hold over system have been cut off, the zero load operation of mid-deep strata ground heat exchanger is realized,
The variation of temperature can true corresponsively thermal parameter, so that the underground heat supplemental characteristic obtained is more accurate.
Step 2, unlocking testing device acquire the temperature of mid-deep strata ground heat exchanger in-out end recirculated water at any time
Delta data and data on flows；
Circulating pump is opened, while opening controller and data collector carry out data acquisition.Flow into recirculated water by outer tube
Mid-deep strata ground heat exchanger, is flowed out by inner tube, and entire test process keeps circular flow in the range of setting.It measures
The flow of recirculated water and the power consumption of water pump, the continuous ground heat exchanger import and export circulating water temperature that records change with time.
A kind of periodic swinging of amplitude decaying can be presented in circulating water temperature within a few hours of beginning, and then enters steady and slow
Temperature rise period.It determines after entering the temperature rise period, close circulating pump, data acquisition terminates.
Step 3, the Calculation of Heat Transfer model for establishing mid-deep strata bushing type ground heat exchanger diabatic process；
The method for establishing the Calculation of Heat Transfer model of mid-deep strata bushing type ground heat exchanger diabatic process specifically:
Step 31, the heat conduction governing equation for establishing rock-soil layer respectively, casing outer tube circulation fluid temperature governing equation and set
The governing equation of pipe inner tube circulation fluid temperature；
Heat transfer around the present embodiment ground heat exchanger in ground can be retouched with two-dimensional transient in cylindrical coordinates is thermally conductive
It states, the heat conduction governing equation of rock-soil layer are as follows:
Wherein, a is the thermal diffusivity of ground, and t is ground temperature, and τ is the time, and r is radial index, and z is axial coordinate.
The recirculated water of the present embodiment establishes inner and outer pipes under the operating condition that outer tube flows into inner tube outflow (outside into interior go out) respectively
The heat transfer equation of middle fluid is as follows:
The control of casing outer tube circulation fluid temperature uses one dimensional transient heat transfer model, governing equation are as follows:
Wherein, tf1For outer tube fluid temperature (F.T.), tf2For inner tube fluid temperature (F.T.), tbFor the temperature of the wall of a borehole, R1For the wall of a borehole with
Thermal resistance between outer pipe fluid, R2Thermal resistance between inner and outer pipes, Mc are the thermal capacity of circulation fluid, C1For the heat of unit length outer tube
Capacity, z are axial coordinate, and τ is the time.
Casing inner tube circulation fluid temperature control equation are as follows:
Wherein, C2For the thermal capacity of unit length inner tube, tf1For outer tube fluid temperature (F.T.), tf2For inner tube fluid temperature (F.T.), Mc is
The thermal capacity of circulation fluid, R2Thermal resistance between inner and outer pipes, z are axial coordinate, and τ is the time.
Step 32, the governing equation primary condition in given step 31 and boundary condition.Primary condition can be in ground
Initial temperature distribution when undisturbed, is specifically as follows:
Wherein qgFor terrestrial heat flow, haFor earth's surface convection transfer rate, taFor earth's surface air themperature, j is the ground number of plies, HjFor
The depth of jth layer, kjFor the thermal coefficient of jth layer.
Initial temperature distribution in stratum depends on local terrestrial heat flow value and ground thermal coefficient, thus also determines
Thereafter diabatic process.
Boundary condition can be with are as follows: the distal border and bottom boundary of cylindrical region are using fixed warm boundary condition；Earth's surface use pair
Flow boundary condition.
Governing equation and given primary condition and boundary condition in step 31 are the Calculation of Heat Transfer mould of the present embodiment
Type.
The present embodiment seeks underground heat test parameter, and basic calculation method is to solve for Inverse Heat Conduction Problem Analysis.Solve heat transfer rhetorical question
Topic can use various optimizations and parameter estimation algorithm.In this problem, according to using algorithm and precision prescribed difference,
Foot of hole temperature can be first measured using individual method, and solution indirect problem is recycled to determine terrestrial heat flow；This can also be used
Method solves indirect problem, directly determines foot of hole temperature, terrestrial heat flow and other more relevant parameters.
Step 4, according to the collected data with the Calculation of Heat Transfer model of mid-deep strata ground heat exchanger, solve heat transfer rhetorical question
Topic uses the algorithm of parameter Estimation, so that curve immediate parameter (the big underground heat that measured data and theoretical model calculate
Stream and foot of hole temperature) value is exactly the estimates of parameters acquired.To realize through measurement bushing type ground heat exchanger
Circulating water temperature is imported and exported, local terrestrial heat flow value and foot of hole temperature value are tested out.Specific steps can be such that
Step 41 fast and effeciently solves mathematical model, i.e. solution direct problem, is to solve for indirect problem and carries out data processing
Basis.The present embodiment carries out numerical solution to mathematical model using finite difference calculus.Using finite difference calculus establishment step 31
In the corresponding DIFFERENCE EQUATIONS of each governing equation, difference scheme uses crisscross method, and resulting DIFFERENCE EQUATIONS can be with
Using arbitrary time step, the difference equation of typical node be can be such that
The difference equation of the internal node of Rock And Soil:
Wherein, t is temperature, Bz、BrFor coefficient, P is time step long number, and i, j are node coordinate.
The difference equation of casing outer tube circulation fluid temperature:
Wherein, B1、B3、B4For coefficient, tf1For outer tube fluid temperature (F.T.), tf2For inner tube fluid temperature (F.T.), t is temperature, when P is
Spacer step long number, i, j are node coordinate.
The difference equation of casing inner tube circulation fluid temperature:
Wherein, tf1For outer tube fluid temperature (F.T.), tf2For inner tube fluid temperature (F.T.), B2、B5And B4For coefficient, t is temperature, when P is
Spacer step long number, j are node coordinate,
Step 42 solves the above DIFFERENCE EQUATIONS, can use chasing method direct solution, obtain theoretical model calculated value,
Obtain the calculated value of rock-soil layer and circulation fluid temperature.It can determine the recirculated water in ground in each point temperature and inner and outer pipes
Temperature change with time.Here it is the bases for solving Inverse Heat Conduction Problem Analysis.It can be asked in embodiment using finite difference calculus
Solve heat transfer model；Inverse Heat Conduction Problem Analysis can be solved using Tikhonov regularization method.
The DIFFERENCE EQUATIONS that corresponding heat transfer model obtains in the present embodiment uses chasing method direct solution, and can use
Arbitrary time step can guarantee the convergence that numerical value calculates.These features ensure that Numerical heat transfer direct problem, that is, solve with
Upper heat transfer model is rapidly and efficiently.
Step 43, according to the out temperature response data of acquisition and the theoretical model calculated value of acquisition, it is anti-to solve heat transfer
Problem determines terrestrial heat flow and foot of hole temperature value.
According to the collected data with the theoretical model calculated value of acquisition, using Tikhonov regularization method solve in it is deep
The Inverse Heat Conduction Problem Analysis of layer ground heat exchanger obtains local terrestrial heat flow and foot of hole temperature.Embodiment uses
Tikhonov regularization method carries out optimization fitting, that is, finding enables measured data most preferably to intend with theoretical calculation data and curves
The terrestrial heat flow and foot of hole temperature value of conjunction.
According to the collected data with the Calculation of Heat Transfer model of mid-deep strata ground heat exchanger, heat transfer problem indirect problem is solved,
Use the algorithm of parameter Estimation so that the immediate parameter of curve that measured data and theoretical model calculate (terrestrial heat flow and
Foot of hole temperature) value is exactly the estimates of parameters acquired.To realize the disengaging by measurement bushing type ground heat exchanger
Mouth circulating water temperature, tests out local terrestrial heat flow value and foot of hole temperature value.
The present embodiment seeks underground heat test parameter, and basic calculation method is to solve for Inverse Heat Conduction Problem Analysis.Fast and effeciently ask
Mathematical model is solved, i.e. solution direct problem, is the basis of data processing.Solve Inverse Heat Conduction Problem Analysis can using it is various optimization and
Parameter estimation algorithm.In this problem, according to the difference using algorithm and precision prescribed, it can first be surveyed using individual method
Determine foot of hole temperature, solution indirect problem is recycled to determine terrestrial heat flow；The method for solving indirect problem can also be used, directly really
Determine foot of hole temperature, terrestrial heat flow and other more relevant parameters.
The present embodiment method for solving uses Tikhonov regularization method, converts the indirect problem of the heat transfer problem to non-
Linear optimization problem carries out the solution of terrestrial heat flow value and foot of hole temperature value.Direct problem in the present embodiment are as follows: according to
Terrestrial heat flow value, foot of hole temperature value and the circulating water flow of hypothesis solve following for mid-deep strata bushing type ground heat exchanger
Ring coolant-temperature gage versus time curve.The present embodiment acquires circulating water temperature versus time curve and flow first
Data are the data that detection obtains.Using the method for solving Inverse Heat Conduction Problem Analysis, the i.e. algorithm of parameter Estimation, so that measured data
The immediate parameter of curve (the terrestrial heat flow and foot of hole temperature) value calculated with theoretical model is exactly the parameter Estimation acquired
Value.To realize the inlet and outlet circulating water temperature by measurement bushing type ground heat exchanger, local terrestrial heat flow is tested out
Value and foot of hole temperature value
Step 5 determines that the evenly heat physical property on stratum is joined according to the local terrestrial heat flow and foot of hole temperature of acquisition
Number.
It can be calculated by following formula:
Wherein, k is the mean coefficient of heat conductivity of rock-soil layer, thIt is foot of hole temperature, t0It is surface temperature, H is that drilling is deep
Degree, qgIt is terrestrial heat flow.
By the test macro and method of the disclosure, measured when being run under the conditions of zero load using ground heat exchanger
Inlet and outlet circulation fluid temperature changes with time, and solves Inverse Heat Conduction Problem Analysis according to certain heat transfer model, and then determine big underground heat
Stream, foot of hole temperature and stratum thermal physical property parameter.Spirit is exchanged heat in the range of principle using different underground pipes herein
The structure snd size of device, the fine degree of heat transfer model and Mathematical method are all in the magnificent range of the treasured of the application.
The foregoing is merely preferred embodiment of the present disclosure, are not limited to the disclosure, for the skill of this field
For art personnel, the disclosure can have various modifications and variations.It is all the disclosure spirit and principle within, it is made any
Modification, equivalent replacement, improvement etc., should be included within the protection scope of the disclosure.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to the disclosure, not the disclosure is protected
The limitation of range, those skilled in the art should understand that, on the basis of the technical solution of the disclosure, those skilled in the art
Member does not need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.
Claims (10)
1. a kind of underground heat parameter test system based on mid-deep strata ground heat exchanger, it is characterized in that: including mid-deep strata underground pipe
Heat exchanger, water inlet valve group, water outlet valve group and test device, the water inlet of the water inlet valve group connection mid-deep strata ground heat exchanger
End, the water outlet of water outlet valve group connection mid-deep strata ground heat exchanger, inlet valve group distinguish connecting test device and heat pump system,
Outlet valve group distinguishes connecting test device and heat pump system；It is carrying out the underground heat parameter testing stage, water outlet valve group and water inlet valve group
It connects test device and mid-deep strata ground heat exchanger, heat pump system is bypassed；When being not at test phase, be discharged valve group and into
Water valve group connects heat pump system and mid-deep strata ground heat exchanger, provides heat source for heat pump system；
The test device includes the test pipeline, circulating pump, flowmeter, temperature sensing connecting with mid-deep strata ground heat exchanger
Device and controller, circulating pump, flowmeter and temperature sensor setting on test pipeline, mid-deep strata ground heat exchanger into
Be provided at least one temperature sensor at water end (W.E.) and at water outlet, the controller respectively with flowmeter and temperature sensor
Connection.
2. a kind of underground heat parameter test system based on mid-deep strata ground heat exchanger as described in claim 1, it is characterized in that:
The mid-deep strata ground heat exchanger is sleeve type structure, including inner and outer tubes, and outer tube nozzle is water inlet end, and inner tube nozzle is
Water outlet, the outer tube have backfilling material layer outside.
3. a kind of underground heat parameter test system based on mid-deep strata ground heat exchanger as claimed in claim 2, it is characterized in that:
The outer tube is steel pipe；Or/and said inner tube is the plastic tube of low heat conductivity or the multiple tube with thermal insulation layer.
4. a kind of underground heat parameter test system based on mid-deep strata ground heat exchanger as claimed in claim 2, it is characterized in that:
The depth of the mid-deep strata ground heat exchanger is greater than 1500m.
5. a kind of underground heat parameter test system based on mid-deep strata ground heat exchanger as described in claim 1, it is characterized in that:
The water outlet valve group is outlet three way valve, and the connection mid-deep strata ground heat exchanger of the water inlet end of the outlet three way valve is discharged
End, the water outlet of the outlet three way valve is separately connected test device and heat pump system.
6. a kind of underground heat parameter test system based on mid-deep strata ground heat exchanger as described in claim 1, it is characterized in that:
The water inlet valve group is inlet triplet for water valve, the mid-deep strata ground heat exchanger water inlet end of the water outlet of the inlet triplet for water valve, institute
The water inlet end for stating inlet triplet for water valve is separately connected test device and heat pump system.
7. based on a kind of underground heat parameter test system based on mid-deep strata ground heat exchanger described in any one of claims 1-6
Test method, characterized in that include the following steps:
It is filled with recirculated water, is restored to undisturbed state to the ground temperature around mid-deep strata ground heat exchanger；
The temperature of unlocking testing device, acquisition mid-deep strata ground heat exchanger in-out end recirculated water changes with time data and stream
Measure data；
Establish the Calculation of Heat Transfer model of mid-deep strata bushing type ground heat exchanger diabatic process；
The Calculation of Heat Transfer model that mid-deep strata ground heat exchanger is solved using numerical computation method, according to the data acquired in test
The Calculation of Heat Transfer model indirect problem for solving mid-deep strata ground heat exchanger obtains local terrestrial heat flow and foot of hole temperature；
The thermal physical property parameter on stratum is determined according to the local terrestrial heat flow and foot of hole temperature of acquisition.
8. test method as claimed in claim 7, it is characterized in that: establishing mid-deep strata bushing type ground heat exchanger diabatic process
Calculation of Heat Transfer model method specifically:
Step 31, the heat conduction governing equation for establishing rock-soil layer respectively, casing outer tube circulation fluid temperature governing equation and casing in
The governing equation of pipe circulation fluid temperature；
Step 32, the governing equation primary condition in given step 31 and boundary condition.
9. test method as claimed in claim 7, it is characterized in that: described solve mid-deep strata underground pipe using numerical computation method
The Calculation of Heat Transfer model of heat exchanger solves the Calculation of Heat Transfer model of mid-deep strata ground heat exchanger according to the data acquired in test
Indirect problem, the step of obtaining local terrestrial heat flow and foot of hole temperature, specifically:
Step 41, the corresponding difference equation of each governing equation using finite difference calculus under circular cylindrical coordinate in establishment step 31
Group；
Step 42 solves DIFFERENCE EQUATIONS using chasing method, obtains theoretical model calculated value；
Step 43, according to the out temperature response data of acquisition and the theoretical model calculated value of acquisition, solve Inverse Heat Conduction Problem Analysis,
Determine terrestrial heat flow and foot of hole temperature value.
10. test method as claimed in claim 7, it is characterized in that: the ground temperature around the mid-deep strata ground heat exchanger
Degree is restored to undisturbed state, to meet any one condition in the following conditions:
Mid-deep strata ground heat exchanger completes construction 30 days or more of drilling, down tube and backfill, and keeps recovery state not by temperature
Degree disturbance；
Mid-deep strata ground heat exchanger is completed after last zero load test run leisure 10 days or more, and keeps restoring shape
State is not by thermal perturbation；
Mid-deep strata ground heat exchanger lies fallow 90 days or more after the heat supply or regenerative operation for completing a upper season, and keeps restoring
State is not by thermal perturbation.
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