CN101587023A - Tester of buried tube heat exchange capability and resistance based on earth source heat pump and testing method - Google Patents
Tester of buried tube heat exchange capability and resistance based on earth source heat pump and testing method Download PDFInfo
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- CN101587023A CN101587023A CNA2008102113511A CN200810211351A CN101587023A CN 101587023 A CN101587023 A CN 101587023A CN A2008102113511 A CNA2008102113511 A CN A2008102113511A CN 200810211351 A CN200810211351 A CN 200810211351A CN 101587023 A CN101587023 A CN 101587023A
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Abstract
The invention relates to a tester for buried tube heat exchange capability and resistance based on an earth source heat pump and a testing method, solves the problem of inaccurate measurement of the buried tube heat exchange capability in the design of an earth source heat pump system, and provides the tester and the testing method for directly testing the buried tube heat exchange capability and resistance. The structure of the tester comprises an adjustable constant temperature groove, a circulating water pump, a heat energy transducer, a differential pressure transmitter and a control system, wherein an outlet tube B of the constant temperature groove is provided with the circulating water pump; a differential pressure meter and a heat energy meter are connected with the outlet tube B and an inlet tube A respectively; the constant temperature groove, a cold and heat energy metering transducer, the differential pressure meter are connected with the control system; and the circulating water pump is connected with the control system through a frequency converter.
Description
Technical field
The present invention relates to a kind of tester and method thereof of heat-exchange capacity and the resistance based on ground buried pipe of ground source heat pump.
Background technology
Earth-source hot-pump system is compared advantage with other air handling system outstanding.Because depths, stratum temperature remains unchanged throughout the year, be higher than the outdoor temperature in winter far away, and be starkly lower than the outdoor temperature in summer, so earth source heat pump overcome the technology barrier of air source heat pump, efficient improves a lot, and energy-saving effect is obvious.Also have in addition low noise, floor area few, do not discharge pollutants, without groundwater abstraction, many advantages such as operation and maintenance cost is low, the life-span is long.
In the design of earth-source hot-pump system, under the situation that buildings is warmed oneself and the needed capacity value that freezes is determined, must know the heat-exchange capacity of the ground pipe laying exchange system that is used to provide Cooling and Heat Source exactly, just the required cold and hot capacity value of the heat-exchange capacity that provides of pipe laying and buildings is complementary.If the heat-exchange capacity that provides of pipe laying is inaccurate over the ground, then designed system may not reach the load needs, and is may scale excessive yet, thereby strengthens initial cost.The classic method of pipe laying heat-exchange capacity is that the sample that at first takes out according to when boring determines that the geology around the boring constitutes, and determines coefficient of heat conductivity by looking into relevant handbook more definitely.Yet subsurface geologic structures constitutes complicated, even with a kind of soil constituent, it is also bigger that its heat-exchange capacity differs.Moreover the coefficient of heat conductivity under the Different Strata geologic condition can differ nearly ten times, and the pipe laying length that causes calculating also differs several times, thereby also can produce sizable deviation in the cost of earth-source hot-pump system.In addition, different shut-in well materials, pipe laying mode heat exchanging is all influential, therefore has only the heat-exchange capacity of directly measuring the ground pipe laying at the scene could calculate the pipe laying quantity of ground pipe laying exactly, thereby determines the degree of depth of well-digging quantity and well-digging.Shandong earth source heat pump research institute discloses a kind of portable ground thermal property tester and method thereof based on earth source heat pump, and publication number is CN 1815211A.This disclosure of the Invention be the apparatus and method that a cover is measured underground ground coefficient of heat conductivity, by measuring the average coefficient of heat conductivity of ground, extrapolate the heat-exchange capacity of ground, the main body that this invention is measured is the coefficient of heat conductivity of ground, and the heat-exchange capacity of measuring the ground pipe laying with the present invention is different fully.
Summary of the invention
Purpose of the present invention is exactly to determine difficult problem in order to solve at present in the design of earth-source hot-pump system over the ground pipe laying heat-exchange capacity and resistance, and a kind of on-the-spot accurately cold and hot exchange capacity of pipe laying over the ground and tester and the method for testing thereof that resistance is measured are provided.
For achieving the above object, the present invention has adopted following technical scheme: a kind of tester of the heat-exchange capacity based on the ground pipe laying, can measure transmitter, a differential pressure transmitter and a control system but comprise that the calibration cell of at least one temperature adjustment, water circulating pump, one are cold and hot.The outlet B of calibration cell is provided with water circulating pump, and pressure difference transmitter and the cold and hot transmitter that can measure are connected with induction pipe A with outlet B respectively.Calibration cell, heat energy transmitter, differential pressure transmitter are connected with control system, and water circulating pump is connected with control system by frequency converter.
But described temperature adjustment calibration cell consists of: a cool-bag, a water circulating pump and source pump, temperature sensor 3 and a control system.It act as the working environment to underground heat radiation in simulation winter from soil heat-obtaining and summer, and makes fluid keep the working temperature of a setting.
Under the effect of ebullator, after the plate type heat exchanger heat exchange, D flows back to calibration cell to fluid by inlet from calibration cell outlet C, and the heat of source pump generation or cold are transmitted to calibration cell by plate type heat exchanger like this, make calibration cell keep the steady state value of a setting.
After the fluid temperature (F.T.) of calibration cell is set, temperature sensor 3 is sent to control system with the calibration cell temperature signal, temperature that control system transmits according to temperature sensor 3 and design temperature poor, start the frequency conversion heat pump unit and provide heat or cold for calibration cell, make the interior temperature of calibration cell close to setting value fast, when temperature in the calibration cell and design temperature near the time, the frequency conversion heat pump unit reduces frequency of operation, thereby control system is regulated the temperature constant of the frequency of operation maintenance calibration cell of source pump automatically according to design temperature.
Described source pump model is TSDT-VKC010, specified heating capacity 12.5KW, and specified refrigerating capacity 9.9KW, the variable-frequence governor model of control source pump is AC60-S2-387G.
The described cold and hot transmitter model of measuring is a CRL-H electromagnetic heat energy transmitter, comprise the special sensor 2 of temperature sensor 1, flow sensor and temperature, temperature sensor 1, flow sensor and constant temperature system outlet B join, and temperature sensor 2 joins with constant temperature system import A.Cold and hotly can measure transmitter acquisition stream value and temperature approach, and then calculate hot exchange power, and give host computer with data upload with the RS-485 communication modes.
Described differential pressure transmitter model is 692, in order to produce the pulse signal that is equal to pressure difference, comprises 2 pressure transducers, and 2 pressure transducers are imported and exported pipe A, B with calibration cell respectively and joined, in order to measure the resistance of ground pipe laying.
Described ebullator model is CHL2-30, and frequency converter is in order to Control Circulation pump flow quantity, and the model of frequency converter is AC20-S2-R75G, and frequency converter is connected with control system.
The model of described adjusting cycloconvertor is VFD007E21, and the frequency conversion scope is 0.1Hz-100Hz.
Described control system comprises Programmable Logic Controller (PLC) unit, and PLC main frame model is DVP14SS11T2, and the main frame front has power light, run indicator and wrong pilot lamp; 14 I/O ports, input port is used to gather the switching value fault input signal, be used to control water pump start-stop, four-way valve switch etc. and leave port, wherein, the opening degree of a high frequency output port control electric expansion valve, 1 standard RS-485 communication port is used for by GPRS wireless system and upper machine communication.
On DVP PLC main frame, expanded 1 temperature collect module that model is DVP04PT-S, be used to gather the temperature value of ground pipe laying for backwater; Expanded an A/D modular converter that model is DVP04AD-S, be used to measure the pressure difference signal of ground pipe laying for the backwater end; Expand a D/A modular converter that model is DVP04DA-S, be used for the output frequency of the frequency converter of Control Circulation water pump, and then realized the purpose of the heat-exchange capacity of the ground pipe laying under the measurement different in flow rate.
Described control system also comprises touch screen human-computer interface system.This system is connected with PLC by the RS-485 of standard, gather the collected information of PLC in real time, on display screen, useful data is shown, simultaneously, can send the corresponding operating of user on touch-screen to PLC by communication modes, PLC carries out relevant work according to the order of host computer (touch-screen).
The model of temperature sensor 3 is the PT100 temperature sensor, its output and the corresponding measuring resistance signal of temperature.
A kind of method based on buried tube heat exchange aptitude tests instrument
In the hole of having bored, bury the ground pipe laying underground, can fluid in the pipe, and backfill on request is connected the A mouth of tester with the outlet of ground pipe laying with the B mouth with inlet, make whole water system formation closed-loop path then.After the tester energized, input flow rate definite value and leaving water temperature definite value are clicked the beginning testing button by touch-screen on man-machine interface, and tester starts water circulating pump and compressor automatically, make flow and temperature reach setting value.
After system was stable, fluid was sent to the cold in the calibration cell or heat underground in pipe outlet B is input to the ground pipe laying that is embedded in the deep layer rock, and fluid and deep layer ground have carried out having got back to again after the heat interchange tester, form closed circulation.The cold and hot transmitter that can measure has been gathered the water outlet of ground pipe laying, inflow temperature difference Δ T and flow q and time corresponding T automatically, as measurement data, after gathering several groups of data, supply backwater temperature difference and flow are averaged, again according to thermal power formula: P=Q/t, wherein, heat Q=c * m * Δ T, quality m=q * t; Get P=c * q * Δ T.C is the specific heat coefficient of fluid.T is the test duration.
In the formula, P is the heat exchange performance number of the measured this place of tester pipe laying.If the P value is a positive number, be the heat absorption power of this place pipe laying, if the P value is a negative, be the heating power of this place pipe laying.
The inlet and outlet pressure of reading the ground pipe laying by differential pressure transmitter is poor, thereby measures the resistance of ground pipe laying.
Beneficial effect
Beneficial effect of the present invention is: heat interchange value and the resistance that can directly read tester, and then obtain the best circulation power consumption and the relation of exchange capacity, for design provides design parameter accurately, the apparatus structure compactness, be easy to carry, the scene is stable, test data is accurate, being beneficial to research, developing geothermal heat pump air-conditioning system and making it industrialization, is the indispensable instrument of soil source heat pump system.
Description of drawings
Fig. 1 is a tester structured flowchart of the present invention
Fig. 2 can measure transmitter and connect block diagram for tester is cold and hot
Fig. 3 is a tester differential pressure transmitter connection layout
Fig. 4 is the calibration cell connection orientation
Fig. 5 is a calibration cell constant temperature system block diagram
Fig. 6 is a tester supervisory system instrument system block diagram
Fig. 7 is the electrical schematic diagram of operation control system in the tester supervisory system
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, after the temperature of calibration cell reached setting value and makes it constant, because the effect of ebullator 1, the fluid in the calibration cell had been undertaken after the heat interchange through the fluid of heating or refrigeration by calibration cell outlet B mouth and ground, turn back in the calibration cell from the A mouth again, form the closed-loop path.Can measure transmitter collecting temperature difference signal Δ T by cold and hot, flow sensor is gathered its flow signal q, thereby calculates calorie value, and differential pressure transporting is read the pressure differential that pipeline is imported and exported, thus the resistance of ducting of measuring.
Among Fig. 2, provided and cold and hotly can measure the transmitter connected mode, cold and hot temperature sensor 1, the temperature sensor 2 that can measure in the transmitter is connected to respectively on calibration cell outlet B and the import A pipeline, and flow sensor is connected to calibration cell export pipeline B.The cold and hot transmitter that can measure sends data to control system.
Provided the connected mode of differential pressure transmitter among Fig. 3, pressure transducer 1 in the differential pressure transmitter, pressure transducer 2 are connected to respectively on calibration cell outlet B pipe and the import A pipe, pressure transducer 1, pressure transducer 2 conduct to differential pressure transmitter with fluid pressure signal respectively, read differential pressure signal and send control system to by differential pressure transmitter, thereby determine the resistance of ground pipe laying by the pressure differential of measuring the ground pipe laying.
The structure and the nozzle orientation of the cool-bag in the calibration cell have been provided among Fig. 4, the cool-bag volume is 200 liters, be made of metal, used metal is a stainless steel, adds heat-insulation layer, be provided with A, B, four import and export of C, D, A, B import and export and buried guard system connected interface, and C, D import and export the plate type heat exchanger interfaces with heat supply (cold), and the E mouth is overflow and exhausr port, the F mouth is a sewage draining exit, and sewage draining exit is provided with blowoff valve.
But provided the structure of temperature adjustment calibration cell among Fig. 5, be provided with temperature sensor 3 in the calibration cell, in order to the temperature of control and adjusting calibration cell, the model of temperature sensor 3 is PT100, it is exported and temperature 0-100 ℃ of corresponding measuring resistance signal, and sends signal to control system.Ebullator 2 models in the calibration cell are CHL2-20, and ebullator 2 is connected with control system by water flow switch, and water flow switch is connected with control system.The model of the source pump in the calibration cell is TSDT-VKC010, and heat supply (cold) power is 10KW, and source pump is connected with control system by frequency converter, and in order to regulate the rotating speed of source pump, the model of frequency converter is AC60-S2-387G.
Provided the instrument system structure of tester among Fig. 6, the PLC host module has program storage, data-carrier store, internal clocking, 14 road I/O mouths, the accurate RS232 communication port of a road sign and an expansion bus mouth, has expanded temperature collect module (PT), analog quantity load module (A/D) and analog output module (D/A) by the expansion bus mouth.
The resistance signal that transmits is sent in each road temperature sensor change, and temperature collect module carries out analog to digital conversion, converts resistance signal to temperature signal, gives the PLC host module by the expansion bus oral instructions again.Temperature collect module has 12 modulus conversion chips of 4 passages, and it receives each road temperature sensor change and send the resistance signal that transmits, and carries out filtering and I/V conversion, carries out analog to digital conversion then, and the digital signal that obtains offers the PLC main frame and handles.
Analog quantity load module (A/D) receives the differential pressure signal that differential pressure pick-up sends, and again voltage signal is carried out modulus/conversion, converts differential pressure signal to digital signal and gives PLC host module by the expansion bus oral instructions.
The current signal that the digital quantity that analog output module (D/A) writes the PLC host module converts 4～20mA to is exported to the current input terminal of frequency converter, the frequency output of control of conversion device.
Its communicating circuit is the RS232 interface circuit of standard, is used for and the host computer transmitting test data.
Fig. 7 has provided the operation control system electrical schematic diagram of tester.
Embodiment 1
Boring aperture 115MM, degree of depth 60M, ground pipe laying are the PE pressure pipe, pipe laying internal diameter 25MM, external diameter 32MM, the boring backfilling material is a backfill soil.
Start the source pump in the tester, the working temperature of regulating source pump is 23 ℃, starts circulation ebullator 2, and water and source pump in the calibration cell are exchanged by plate type heat exchanger, makes the temperature in the calibration cell reach 23 ℃.
Fill water in the ground pipe laying, drain inner air tube, tester water outlet B and ground one of pipe laying are joined, the water return outlet of other end and tester joins, and starts ebullator 1, makes calibration cell and buried pipe formation closed circulation.Set pump flow, temperature difference Δ T by calorimeter read test instrument outlet B and import A, and calorie value P, and with data automatic recording in control system, get its weighted mean value, promptly get the heat-exchange capacity of this ground pipe laying, differential pressure transmitter is read the resistance of this ground pipe laying.
Regulate the flow of ebullator, read out temperature difference Δ T and flow value respectively, calculate heat-exchange capacity, read the pressure difference of differential pressure transmitter, thus the maximum thermal exchange ability while resistance of determining this ground pipe laying flow value hour.
| Flow (M 3/H) | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 |
| Heat-exchange capacity (KW) | 1.8 | 1.9 | 2.0 | 2.0 | 2.1 | 2.1 | 2.1 | 2.2 |
| Ground pipe laying resistance (KPa) | 9.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.5 | 15.0 | 16.0 |
From last Biao Kede, ground pipe laying flow control is at 0.9M
3During/H, it is bigger that heat-exchange capacity reaches value, and resistance is less simultaneously.
Embodiment 2
Boring aperture 115MM, degree of depth 60M, ground pipe laying are the PE pressure pipe, pipe laying internal diameter 25MM, external diameter 32MM, the boring backfilling material is a backfill soil.
Start the source pump in the tester, the working temperature of regulating source pump is 7 ℃, starts circulation ebullator 2, and water and source pump in the calibration cell are exchanged by plate type heat exchanger, makes the temperature in the calibration cell reach 7 ℃.
Fill water in the ground pipe laying, drain inner air tube, tester water outlet B and ground one of pipe laying are joined, the water return outlet of other end and tester joins, and starts ebullator 1, makes calibration cell and buried pipe formation closed circulation.Set pump flow, temperature difference Δ T by calorimeter read test instrument outlet B and import A, and calorie value P, and with data automatic recording in control system, get its weighted mean value, promptly get the heat-exchange capacity of this ground pipe laying, differential pressure transmitter is read the resistance of this ground pipe laying.
Regulate the flow of ebullator, read out temperature difference Δ T and flow value respectively, calculate heat-exchange capacity, read the pressure difference of differential pressure transmitter, thus the maximum thermal exchange ability while resistance of determining this ground pipe laying flow value hour.
| Flow (M 3/H) | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1.0 | 1.1 | 1.2 |
| Heat-exchange capacity (KW) | -1.6 | -1.7 | -1.9 | -2.0 | -2.0 | -2.0 | -2.0 | -2.1 |
| Ground pipe laying resistance (KPa) | 9.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.5 | 15.0 | 16.0 |
From last Biao Kede, ground pipe laying flow control is at 0.8M
3During/H, it is bigger that heat-exchange capacity reaches value, and resistance is less simultaneously.
Claims (7)
1, a kind of based on the tester of measuring ground buried pipe of ground source heat pump heat-exchange capacity and its resistance thereof, it is characterized in that: but comprise the calibration cell of a temperature adjustment, ebullator, poor transmitter, one cold and hotly can measure transmitter and a control system, outlet B place at adjustable calibration cell is provided with water circulating pump, cold and hotly can measure transmitter and differential pressure transmitter is connected with calibration cell outlet B and induction pipe A respectively, calibration cell, cold and hot transmitter, the differential pressure transmitter of measuring are connected with control system respectively.
2, claims 1 are described based on the tester of measuring ground buried pipe of ground source heat pump heat-exchange capacity and its resistance thereof, it is characterized in that, described calibration cell comprises: a cool-bag, an ebullator, 1 temperature sensor, a source pump, be provided with temperature sensor 3 in the calibration cell, the export pipeline C of calibration cell is provided with ebullator, and fluid and source pump in the calibration cell are carried out heat interchange, make calibration cell reach constant temperature.
3, claims 1 are described based on the tester of measuring ground buried pipe of ground source heat pump heat-exchange capacity and its resistance thereof, it is characterized in that: described control system comprises instrument system, it consists of: comprise Programmable Logic Controller (PLC) unit, PLC main frame model is DVP14SS11T2, and the main frame front has power light, run indicator and wrong pilot lamp; 14 I/O ports, input port is used to gather the switching value fault input signal, is used to control water pump start-stop, four-way valve switch etc. and leave port, wherein, the opening degree of a high frequency output port control electric expansion valve; 1 standard RS-485 communication port is used for and upper machine communication; On DVP PLC main frame, expanded 1 temperature collect module that model is DVP04PT-S, be used to gather the temperature value of ground pipe laying for backwater; Expanded an A/D modular converter that model is DVP04AD-S, be used to measure the pressure difference signal of ground pipe laying for the backwater end; Expanded a D/A modular converter that model is DVP04DA-S, be used for the output frequency of the frequency converter of Control Circulation water pump, and then the rotating speed of Control Circulation water pump reaches the purpose that automatic flow is regulated.
4, it is described based on the tester of measuring ground buried pipe of ground source heat pump heat-exchange capacity and its resistance thereof that claim is asked book 1, it is characterized in that: control system also comprises touch screen human-computer interface system, RS-485 by standard is connected with PLC, gather the collected information of PLC in real time, on display screen, useful data is shown, simultaneously, can send the corresponding operating of user on touch-screen to PLC by communication modes, PLC carries out relevant work according to the order of host computer (touch-screen).
5, the most book 2 described calibration cells of claim is characterized in that described source pump is the frequency conversion heat pump unit.
6, claims 1 are described based on the tester of measuring ground buried pipe of ground source heat pump heat-exchange capacity and its resistance thereof, it is characterized in that described ebullator is the frequency conversion ebullator of adjustable speed.
7, a kind of based on the method for measuring buried tube heat exchange ability, it is characterized by: in the hole of having bored, bury the ground pipe laying underground, can fluid in the pipe, and backfill on request, the A mouth of tester is connected with inlet with the outlet of ground pipe laying with the B mouth, makes whole water system form the closed-loop path then.After the tester energized, input flow rate definite value and leaving water temperature definite value are clicked the beginning testing button by touch-screen on man-machine interface, and tester starts water circulating pump and compressor automatically, make flow and temperature reach setting value.After system was stable, fluid was in pipe outlet B is input to the ground pipe laying that is embedded in the deep layer rock, and fluid and deep layer ground have carried out having got back to again after the heat interchange tester, formed closed circulation.Calorimeter gathered automatically calibration cell A pipe, B pipe and water outlet, water inlet coolant-temperature gage difference Δ T and flow q and time corresponding T, as measurement data, gather array data after, supply backwater temperature difference and flow are averaged.Again according to thermal power formula: P=Q/t, wherein, heat Q=c * m * Δ T, quality m=q * t; Get P=c * q * Δ T.C is the specific heat coefficient of fluid.T is the test duration.In the formula, P is the heat exchange performance number of the measured this place of tester pipe laying.If the P value is a positive number, be the heat absorption power of this place pipe laying, if the P value is a negative, be the heating power of this place pipe laying; The resistance that is the ground pipe laying that differential pressure transmitter is read.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008102113511A CN101587023A (en) | 2008-09-23 | 2008-09-23 | Tester of buried tube heat exchange capability and resistance based on earth source heat pump and testing method |
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| CNA2008102113511A CN101587023A (en) | 2008-09-23 | 2008-09-23 | Tester of buried tube heat exchange capability and resistance based on earth source heat pump and testing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288635A (en) * | 2011-05-13 | 2011-12-21 | 上海市地矿工程勘察院 | Group Hole Thermal Response Test Method |
| CN102706751A (en) * | 2012-06-08 | 2012-10-03 | 苏州际能环境能源技术有限公司 | Multifunctional detecting device for vertical buried pipe |
| CN102998132A (en) * | 2012-11-16 | 2013-03-27 | 无锡商业职业技术学院 | Device for testing energy-saving water source heat pump performance coefficients |
| CN103913023A (en) * | 2014-03-10 | 2014-07-09 | 重庆大学 | Circular flow control method of ground source heat pump system |
-
2008
- 2008-09-23 CN CNA2008102113511A patent/CN101587023A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288635A (en) * | 2011-05-13 | 2011-12-21 | 上海市地矿工程勘察院 | Group Hole Thermal Response Test Method |
| CN102706751A (en) * | 2012-06-08 | 2012-10-03 | 苏州际能环境能源技术有限公司 | Multifunctional detecting device for vertical buried pipe |
| CN102706751B (en) * | 2012-06-08 | 2015-08-19 | 江苏际能能源科技股份有限公司 | One is pipe laying multifunctional detecting device vertically |
| CN102998132A (en) * | 2012-11-16 | 2013-03-27 | 无锡商业职业技术学院 | Device for testing energy-saving water source heat pump performance coefficients |
| CN103913023A (en) * | 2014-03-10 | 2014-07-09 | 重庆大学 | Circular flow control method of ground source heat pump system |
| CN103913023B (en) * | 2014-03-10 | 2016-01-20 | 重庆大学 | The circular flow control method of earth-source hot-pump system |
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Open date: 20091125 |