CN112229870A - Controllable multi-factor ground source heat pump test platform and method thereof - Google Patents
Controllable multi-factor ground source heat pump test platform and method thereof Download PDFInfo
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Abstract
The invention discloses a controllable multi-factor ground source heat pump test platform and a method thereof. The test method is that the horizontal heat preservation tank embedded with the coaxial sleeve heat exchanger is divided into a plurality of sections, and a heating device and a refrigerating device are arranged in the relevant sections to simulate the environmental temperatures of different strata in the actual situation of a project. The test platform is easy to build, can control the temperature field of the soil body, and simulates the influence of various factors on the heat exchange efficiency of the buried pipe heat exchanger; the test can be carried out indoors, and the operability is strong.
Description
Technical Field
The invention belongs to the technical field of ground source heat pump systems, and particularly relates to a controllable multi-factor ground source heat pump test platform and a method thereof
Background
With the increasing shortage of energy consumption and the increasing severity of environmental pollution caused by mineral chemical energy, ground source heat pump technology with the characteristics of low energy consumption and environmental protection has entered the field of practical engineering application. As a high-efficiency energy-saving air conditioning system which utilizes underground shallow heat resources (including underground water, surface water and soil sources) and can supply cold and heat, a ground source heat pump realizes the transfer of low-level energy heat to high-level energy heat by outputting and inputting a small amount of low-level energy. The construction of the existing domestic and foreign ground source heat pump test platform is mainly represented as a vertical drilling pipe burying form, and the test platform in the form has the following defects:
1) drilling costs are high and increase with increasing depth.
2) The temperature field in the deep geological soil is complex and changeable, the soil layer structure is complicated, and the temperature field is difficult to control during the test.
3) The experimental research under the combined action of various factors in the deep geological soil is not easy to carry out, and an ideal experimental effect is difficult to obtain.
Therefore, in order to improve the operability of the ground source heat pump test, a controllable multi-factor ground source heat pump test platform and a method thereof are in urgent need.
Disclosure of Invention
The invention provides a controllable multi-factor ground source heat pump test platform and a method thereof, which are used for solving the problems that the conventional ground source heat pump vertical drilling test platform is difficult to control a soil layer temperature field, the construction cost of the test platform is high and the like.
The technical scheme adopted by the invention is as follows: a controllable multi-factor ground source heat pump test platform comprises a thermal response tester, a control platform, a horizontal heat preservation tank, a heating device, a refrigerating device, an acoustic emission sensor and a temperature sensor; the water inlet and the water outlet of the pipeline of the thermal response tester are connected with the coaxial double-pipe heat exchanger to form a closed loop.
Further, in order to better realize the invention, the thermal response tester comprises a circulating water pump and a temperature testerSensor, flowmeter, electric heater, valve. And the circulating water pump is connected with the flowmeter and the temperature sensor. Wherein the controllable range of the flow of the circulating water pump is 0.05-5 m3The measurement accuracy of the temperature sensor is +/-0.2 ℃, the accuracy of the flowmeter is 0.2 grade, and the controllable range of the three-gear adjustable power of the electric heater is 2-6 kw.
Further, in order to better realize the invention, the control platform comprises an osmotic characteristic controller and a full-length temperature monitor. The osmotic characteristic controller can control and monitor the flow rate of the seepage water in real time and display the seepage coefficient by being connected with a computer program. The full-length temperature monitor is used for monitoring the temperature within the range of-40-180 ℃, the temperature monitoring precision is +/-0.1 ℃, and the change of the whole temperature field of the horizontal heat-preservation tank is monitored.
Further, in order to better realize the invention, the heating device comprises a resistance heating plate which is connected with a temperature control box. The resistance heating plate is a PTC thermistor heating plate, the heating temperature range is 60-270 ℃, the resistance heating plate is high-temperature resistant and has the automatic energy-saving characteristic, and after the heating ambient temperature is increased, the power can be gradually reduced. The temperature control range of the temperature control box is 0-600 ℃, the measurement precision is 0.2 level, the response is fast, the temperature control is accurate, and when the temperature reaches a preset value, an audible and visual alarm is triggered and the power supply is automatically cut off.
Further, in order to better implement the invention, the refrigerating device comprises a compressor, a condenser, an evaporator and an expansion valve. The compressor is a subminiature compressor, and is small in size, light in weight, low in energy consumption, variable in frequency and convenient to test. The condenser consists of a copper tube and a copper-plated steel wire, and is free of a fan, so that the power consumption is saved. The evaporator is a plate evaporator consisting of two forming plates, and has the advantages of small resistance, low metal energy consumption and adjustable heat transfer area. The expansion valve is an internal balance type thermostatic expansion valve, and the opening degree is adjusted by measuring the superheat degree of return air on an outlet pipeline of the evaporator through a temperature sensing bulb so as to adjust the liquid supply amount.
Furthermore, in order to better realize the invention, the invention also comprises platinum resistance temperature sensors, the buried pipes in the horizontal heat-preservation groove are provided with the platinum resistance temperature sensors, the temperature measurement range of the platinum resistance temperature sensors can reach-50-260 ℃, the temperature measurement precision is 0.1 ℃, and the platinum resistance temperature sensors are waterproof and corrosion-resistant. The platinum resistance temperature sensors are equidistantly distributed in the embedded pipes of all sections and are simultaneously connected with the control platform through signals.
Furthermore, in order to better realize the invention, the system also comprises an acoustic emission sensor, and the acoustic emission sensor is connected with the control platform. The acoustic emission sensor is a resonant acoustic emission sensor with the model PXR001, is an embedded waterproof sensor, and has the resonant frequency of 1kHz and the sensitivity of 90 mv/g. And meanwhile, the acoustic emission sensor is bonded on the wall of the coaxial sleeve heat exchanger by epoxy resin, so that the measurement precision of the flow resistance of water flow is improved.
The method for testing by adopting the controllable multi-factor ground source heat pump test platform comprises the following steps:
1) equipment installation: and embedding the buried pipe heat exchanger in the horizontal heat insulation tank, backfilling sandy soil, and connecting the water inlet and the water outlet of the pipeline of the thermal response tester with the coaxial sleeve pipe heat exchanger to form a closed loop.
2) The section device is provided with: a seepage device, a heating device and a refrigerating device are arranged in the horizontal heat-insulating groove divided into a plurality of sections, and are simultaneously connected with a control platform.
3) Measuring the initial temperature of the soil body: and starting the thermal response tester to test the initial temperature of the soil body, so that the water pump runs for 1-2 hours, and the system can automatically record the data of the time period.
4) Extracting comprehensive thermophysical parameters of the soil body: and starting the electric heater, determining the electric heating power according to the depth of the buried pipe, observing the change of the temperature of the inlet and outlet water of the buried pipe in real time, extracting relevant test data, and calculating thermophysical parameters such as the comprehensive heat conductivity coefficient of the backfill soil body.
Furthermore, a heating or refrigerating device is started to simulate underground temperature fields in different stratum environments. And the change of the temperature field of the test platform is controlled by the connected control platform, and relevant data is recorded.
Compared with the existing test platform, the invention has the following beneficial effects:
1) according to the test platform, the horizontal heat preservation tank is divided into a plurality of sections, and the buried pipe heat exchanger is horizontally embedded, so that the soil layer conditions in different stratum environments can be conveniently simulated;
2) the problem of high cost in building a vertical drilling buried pipe type test platform is solved;
3) the heating device and the refrigerating device can simulate the temperature of soil layers in different depths in different areas. The earth temperature field can be controlled. The influence of multiple factors on the heat exchange efficiency of the ground source heat pump is convenient to research, and the operability is strong.
Drawings
FIG. 1 is a schematic view of the overall plane structure of a controllable multi-factor ground source heat pump test platform according to the present invention;
FIG. 2 is a schematic diagram of the thermal response tester of the present invention;
FIG. 3 is a schematic view of the heating apparatus according to the present invention;
FIG. 4 is a schematic diagram of the operation of the refrigeration unit of the present invention;
FIG. 5 is a schematic diagram of the field layout of the test platform of the present invention;
in the figure:
1-thermal response tester; 2-a control platform; 3-horizontal heat preservation groove; 4-a heating device; 5-a refrigerating device; 6-an acoustic emission sensor; 7-platinum resistance temperature sensors; 8-water inlet pipe; 9-a water return pipe; 10-temperature control box; 11-a resistance heating plate; 12-an electric heater; 13-a flow meter; 14-a circulating water pump; 15-a temperature sensor; 16-a valve; 17-an evaporator; 18-a condenser; 19-a compressor; 20-expansion valve.
Detailed Description
As shown in fig. 1 and 2, the device comprises a thermal response tester 1, a control platform 2, a horizontal heat preservation groove 3, a heating device 4, a refrigerating device 5, an acoustic emission sensor 6 and a platinum resistance temperature sensor 7; wherein, a water inlet pipe 8 and a water return pipe 9 of the thermal response tester 1 are connected with the coaxial double-pipe heat exchanger to form a closed loop. The circulating water pump 14 in the thermal response tester 1 drives the liquid in the pipeline to circulate, the electric heater 12 serves as a heat source to heat the liquid, and the controller controls the heat input into the soil body, so that the constant input heat is ensured. The horizontal heat-preserving grooves 3 are equidistantly divided into a plurality of sections, and backfill of different types can be replaced in each section, so that the influence of the types of different soil layers and the thickness of the soil layers on the heat exchange efficiency of the ground heat exchanger can be conveniently researched. Meanwhile, the bottom and the top of the horizontal heat-insulating groove 3 are respectively provided with a movable restraint bracket, so that the heat-insulating groove is prevented from deforming due to the external expansion of the backfill soil in the groove. The platinum resistance temperature sensors 7 are arranged on the full-length sleeve at fixed intervals, and the change of the temperature field inside the through-length backfill soil body in the horizontal heat-preservation groove 3 is monitored in real time.
As shown in fig. 3, in the test platform, the heating device 4 is a device for simulating the temperature of soil in summer or at different depths, and comprises a resistance heating plate 11 and a temperature control box 10, during the test, a target heating temperature is set, the soil body to be studied is heated, and after the temperature reaches the target value, the temperature control box 10 connected with the resistance heating sheet 11 automatically cuts off the power supply, stops heating, and is convenient to control.
As shown in fig. 4, in this test platform, the refrigeration device 5 is a device for simulating the soil temperature in a severe cold area or a winter environment, and includes a compressor 19, a condenser 18, an evaporator 17, and an expansion valve 20. After the device is started, the refrigerant absorbs heat of a cooled object in the evaporator 17 at an evaporation temperature corresponding to the evaporation pressure and is vaporized, the vaporized low-temperature and low-pressure refrigerant vapor is extracted by the compressor 19 and is compressed to the condensation pressure and sent to the condenser 18, and the high-temperature and high-pressure refrigerant vapor is cooled by the ambient cooling medium in the condensation and condensed into refrigerant liquid with high pressure and normal temperature. The liquid is depressurized by the expansion valve 20 and enters the evaporator to be continuously vaporized, thereby achieving the refrigeration effect. Therefore, the soil temperature in a severe cold area or a winter environment is simulated.
The method for testing by adopting the controllable multi-factor ground source heat pump test platform comprises the following steps:
1) equipment installation: and embedding the buried pipe heat exchanger in the horizontal heat-insulating tank, backfilling sandy soil, and connecting the water inlet pipe and the water return pipe of the thermal response tester with the coaxial sleeve pipe heat exchanger to form a closed loop.
2) The section device is provided with: the horizontal heat preservation groove is equally divided into a plurality of sections, and a plurality of movable constraint supports are arranged at the top end and the bottom end of each section. Used for restraining the horizontal groove and preventing the heat preservation groove from expanding and deforming due to the backfilling in the groove. Meanwhile, a seepage device, a heating device and a refrigerating device are arranged in the corresponding section and are simultaneously connected with the control platform.
3) Measuring the initial temperature of the soil body: and starting the thermal response tester to test the initial temperature of the soil body, so that the water pump runs for 1-2 hours, and the system can automatically record the data of the time period.
4) Extracting comprehensive thermophysical parameters of the soil body: starting an electric heater, inputting proper electric heating power into a thermal response tester according to the depth of the buried pipe, observing the change of the temperature of the water entering and exiting the buried pipe in real time, and deriving relevant data in the thermal response tester, such as: inlet and outlet temperature, pressure, flow, heat transfer per linear meter, etc.
The testing method of the platform also comprises the following steps:
5) starting the heating device: when the soil temperature of summer or deep soil is simulated, the thermal response tester is started, the heating device is started, the target heating temperature is set, and the soil in the section to be heated is heated. When the temperature reaches the target value, the temperature control box connected with the resistance heating sheet automatically cuts off the power supply and stops heating. Meanwhile, relevant experimental data in the thermal response tester are derived.
6) Starting the refrigerating device: when the soil environment in winter or severe cold areas is simulated, the thermal response tester is started, the refrigerating device is started to cool the soil body in the section, and the temperature change condition of the soil layer is observed through the temperature controller in the control platform. And derive relevant experimental data in the thermal response tester.
Further, still including the buried pipe in the horizontal heat preservation groove all be equipped with temperature sensor, temperature sensor equidistance distributes in each district section buries intraductally, and with control platform's signal connection, can acquire the change of the interior temperature field of each district section of heat preservation groove in real time. Meanwhile, the pipe laying of the heat preservation groove also comprises an acoustic emission sensor which is bonded on the pipe wall of the coaxial sleeve heat exchanger by epoxy resin and is connected with the signal of the control platform for monitoring the flow resistance of water flow in the horizontal pipe laying pipeline. And recording water flow resistance data from the control platform.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A controllable multi-factor ground source heat pump test platform and a method thereof are characterized in that: the device comprises a thermal response tester (1), a control platform (2), a horizontal heat preservation groove (3), a heating device (4), a refrigerating device (5), an acoustic emission sensor (6) and a platinum resistance temperature sensor (7); wherein the water inlet pipe (8) and the water outlet pipe (9) of the thermal response tester (1) are connected with the coaxial sleeve heat exchanger to form a closed loop. The horizontal heat-insulating groove (3) is divided into a plurality of sections, and a plurality of movable constraint supports are arranged at the top end and the bottom end.
2. The controllable multi-factor ground source heat pump test platform of claim 1, wherein: the thermal response tester (1) comprises a circulating water pump (14), a temperature sensor (15), a flow meter (13), an electric heater (12) and a valve (16). The circulating water pump (14) is connected with the flowmeter (13) and the temperature sensor (15).
3. The controllable multi-factor ground source heat pump test platform of claim 1, wherein: the control platform (2) comprises a permeability characteristic controller and a full-length temperature monitor.
4. The controllable multi-factor ground source heat pump test platform of claim 1, wherein: the heating device (4) comprises a resistance heating plate (11) connected with a temperature control box (10).
5. The controllable multi-factor ground source heat pump test platform of claim 1, wherein: the refrigerating device (5) comprises a compressor (19), a condenser (18), an evaporator (17) and an expansion valve (20).
6. The controllable multi-factor ground source heat pump test platform of claim 1, wherein: still include platinum resistance temperature sensor (7), the buried pipe in horizontal heat preservation groove (3) all is equipped with platinum resistance temperature sensor (7), platinum resistance temperature sensor (7) equidistance distribute in each district section buries intraductally, and with the signal connection of control platform (2).
7. The controllable multi-factor ground source heat pump test platform of claim 1, wherein: the device is characterized by further comprising an acoustic emission sensor (6), wherein the acoustic emission sensor (6) is connected with the control platform (2).
8. The testing method of the controllable multi-factor ground source heat pump testing platform according to claim 1, characterized by comprising the following steps:
1) the buried pipe heat exchanger is buried in the horizontal heat preservation tank (3) and is backfilled with sandy soil, and the water inlet pipe (8) and the water return pipe (9) of the thermal response tester (1) are connected with the coaxial sleeve pipe heat exchanger to form a closed loop.
2) A heating device (4) and a refrigerating device (5) are arranged in the horizontal heat-insulating groove (3) divided into a plurality of sections and are simultaneously connected with the control platform (2).
3) And starting the thermal response tester (1), starting to test the initial temperature of the soil body, and enabling the circulating water pump to run for 1-2 hours, wherein the system can automatically record the data of the time period.
4) And starting the electric heater (12), determining the electric heating power according to the depth of the buried pipe, observing the change of the temperature of the inlet water and the outlet water of the buried pipe in real time, and extracting relevant test data.
9. The testing method of the controllable multi-factor ground source heat pump testing platform according to claim 8, characterized by comprising the following steps:
5) when the influence of different factors on the heat exchange energy efficiency of the ground heat exchanger is researched, the heating device (4) or the refrigerating device (5) is started, and underground temperature fields in different stratum environments are simulated. And relevant data are collected through the control platform (2) and the thermal response tester (1).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964743A (en) * | 2021-02-06 | 2021-06-15 | 安徽理工大学 | Horizontal geothermal extraction test system |
| CN114813827A (en) * | 2022-04-25 | 2022-07-29 | 河海大学 | Micro-thermal test device and method for determining thermophysical property parameters of aquifer |
| CN115451618A (en) * | 2022-09-06 | 2022-12-09 | 河海大学 | Heat control method of ground source heat pump |
-
2020
- 2020-11-04 CN CN202011219217.3A patent/CN112229870A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964743A (en) * | 2021-02-06 | 2021-06-15 | 安徽理工大学 | Horizontal geothermal extraction test system |
| CN114813827A (en) * | 2022-04-25 | 2022-07-29 | 河海大学 | Micro-thermal test device and method for determining thermophysical property parameters of aquifer |
| CN115451618A (en) * | 2022-09-06 | 2022-12-09 | 河海大学 | Heat control method of ground source heat pump |
| CN115451618B (en) * | 2022-09-06 | 2024-05-14 | 河海大学 | Heat control method of ground source heat pump |
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