CN101358940A - Phase change heat storage tester - Google Patents
Phase change heat storage tester Download PDFInfo
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- CN101358940A CN101358940A CNA2008102226083A CN200810222608A CN101358940A CN 101358940 A CN101358940 A CN 101358940A CN A2008102226083 A CNA2008102226083 A CN A2008102226083A CN 200810222608 A CN200810222608 A CN 200810222608A CN 101358940 A CN101358940 A CN 101358940A
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- 230000008859 change Effects 0.000 title claims abstract description 19
- 238000005338 heat storage Methods 0.000 title abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 239000012782 phase change material Substances 0.000 claims abstract description 34
- 238000012360 testing method Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000003381 stabilizer Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000005485 electric heating Methods 0.000 abstract 3
- 230000007547 defect Effects 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012353 t test Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
A phase change heat storage tester comprises a water bath, a voltage stabilizer, a solid state relay, a power converter, a temperature detector, a data acquisition instrument and a computer; the water bath consists of an inner heating barrel, an electric heating rod and an outer heat-insulating barrel. One end of the voltage stabilizer is connected with the power supply, and the other end of the voltage stabilizer is connected with the electric heating rod to supply power for the electric heating rod. The solid-state relay, the data acquisition instrument and the computer jointly form a monitoring and control part of the whole testing process. Whether the heating needs to be stopped or started is judged through data collected by the data collector, and a command is sent out again by the computer to control the on/off of the solid-state relay. Aiming at the defects of the existing experimental method for researching the building phase-change material and testing the heat storage performance of the building phase-change material, the device can heat the water bath filled with the building phase-change material, measure the temperature by using the temperature sensor, draw a real-time temperature curve, and finally calculate the heat storage capacity of the building phase-change material by controlling the starting and stopping of the heating device according to the test data.
Description
(1) technical field:
A kind of phase change thermal storage tester of the present invention, it relates to a kind of test of building the heat storage performance of phase-change material, and promptly test architecture phase-change material absorbent heat in the process that undergoes phase transition belongs to proving installation.
(2) technical background:
Along with the rapid economic development of China and the raising day by day of people's living standard, people are also more and more higher to the requirement of indoor environment comfort level in recent years.In influencing indoor environment comfort level all multifactor, room temperature is a very The key factor, is the key of environmental degree of comfort in the holding chamber and keep room temperature at 16.0 ℃～28.0 ℃.For reaching this standard, people regulate temperature by utilizing air-conditioning and heating system, energy consumption increases considerably, problems such as energy resource consumption is too fast, increasing environmental pollution but can cause accordingly because building energy consumption about 80% be used to the regulating and controlling indoor temperature and humidity.How in indoor environment comfort level, energy-saving and environmental protection, to keep balance to become the hot issue of architectural design and energy-saving field.
Make the architectural exterior-protecting construction of higher heat capacity by in the common building material, adding phase-change material PCM (Phase change material), can solve the contradiction between the problems such as comfort level, energy-conservation, environmental pollution effectively.Because PCM physical state or molecular structure in certain temperature range change, the absorption of a large amount of heats of simultaneous or emit in this process, so can utilize the effect of this thermal expansion to come regulating and controlling to pass through the heat transfer on body of wall, top board and floor, reach the purpose that reduces building energy consumption.
Also there are a large amount of researchers that phase-change material is studied at present, and the mixing by various materials, also produced a lot of phase-change materials for building.Yet but do not have a kind of experimental apparatus can the heat storage performance test of advancing of building phase-change material be made and produce the unified standards and norms of enterprise's neither one of building phase-change material, limited the development of whole building phase-change material industry.
(3) summary of the invention:
A kind of phase change thermal storage tester of the present invention, its purpose is the deficiency at the experimental technique of the heat storage performance of existing research building phase-change material and test architecture phase-change material, a kind of device that is used for the amount of stored heat of test architecture phase-change material is provided, by the water-bath that the building phase-change material is housed is heated, utilize the temperature of temperature sensor measurement water-bath, and draw the real time temperature curve, in start and stop, calculate the amount of stored heat of building phase-change material at last by test data by principle of automatic control control heating arrangement.
A kind of phase change thermal storage tester of the present invention, it is mainly by water-bath, voltage stabilizer, solid-state relay, power supply changeover device, hygrosensor, data collecting instrument and computing machine are formed; Its:
Water-bath by the good outer heat-preserving container 1 of effect of heat insulation, be incubated bung 2, interior thermotank 3, interior heating bung 4 and electrically heated rod 5 outward and form; This outer heat-preserving container 1 is divided into inside and outside two-layer, and interlayer is a polyurethane heat insulation material, is covered with outer insulation bung 2 outside on heat-preserving container 1 bung; Should be placed on outer heat-preserving container 1 inside by interior thermotank 3, and heat bung 4 on the bung of interior thermotank 3, being covered with, and be provided with electrically heated rod 5, in interior thermotank 3, be provided with the temperature sensing point, be used to test the size of water temperature in the bottom of interior thermotank 3; Also respectively be provided with the temperature sensing point, the temperature that is used to test the inside and outside wall of outer heat-preserving container on the inside and outside wall of heat-preserving container 1 outside; The data line that connects this electrically heated rod 5 and hygrosensor 6 links to each other with data collecting instrument 12 with voltage stabilizer 9 by trough 7 with power lead, and this electrically heated rod 5 is connected with solid-state relay 10 simultaneously;
Solid-state relay 10 connects voltage stabilizer 9 respectively, also connects data collecting instruments 12 by power supply changeover device 11, the start and stop of this solid-state relay 10 and data collecting instrument 12 common control heating processes; This solid-state relay 10 is controlled electrically heated rod 5 start and stop with the dutycycle principle, and changes its heating power, mainly be to change total heating power according to heating start-stop time within a certain period of time, and start/stop heating when temperature reaches certain limit;
One end (input end) of power supply changeover device 11 is connected with solid-state relay 10, and the other end (output terminal) links to each other with data collecting instrument 12, becomes 24V to provide power supply for data collecting instrument 12 the 220V voltage transitions;
Water temperature in hygrosensor 6 test in the thermotank 3, and judge according to the survey water temperature and to begin/to stop to heat that this hygrosensor 6 directly is connected with data collecting instrument 12;
Wherein, hygrosensor 6 is made up of thermocouple temperature sensor, is used for surveying the temperature of water, and analog electrical signal is converted to temperature signal.
Wherein, data collecting instrument 12 uses the Mitsubishi PLC programmable software, makes the user directly carry out control operation on computing machine 13 interfaces.
A kind of phase change thermal storage tester of the present invention, it has the following advantages and the high-lighting effect: the 1. amount of stored heat of test architecture phase-change material; 2. by the amount of stored heat of test phase transformation building materials, enlarge the usable range of phase transformation building materials; 3. total system can be controlled automatically according to the height of water temperature; 4. the user carves monitoring when not required, and computing machine is understood automatic storage temperature data and it is depicted as curve display; 5. operation interface is simple; 6. the development for building phase-change material industry provides a unified codes and standards.
(4) description of drawings
Fig. 1 is the synoptic diagram of this phase change thermal storage tester
Fig. 2 is signal conversion processing and control flow chart
Number in the figure is as follows:
1, outer heat-preserving container 2, be incubated bung 3, interior thermotank 4, interior heating bung outward
5, electrically heated rod 6, hygrosensor 7, trough 8,220V power supply
9, voltage stabilizer 10, solid-state relay 11, conversion electric power 12, data collecting instrument
13, computing machine
(5) embodiment
Below in conjunction with accompanying drawing principle of the present invention, concrete structure and enforcement are further described.
A kind of phase change thermal storage tester, mainly by water-bath, voltage stabilizer, solid-state relay, power supply changeover device, hygrosensor, data collecting instrument and computing machine totally seven parts are formed; This water-bath mainly by outer heat-preserving container 1, is incubated bung 2 outward, interior thermotank 3, and interior heating bung 4, electrically heated rod 5 is formed; Heat-preserving container 1 upper cover is provided with outer insulation bung 2 outside, be filled with polyurethane heat insulation material between the heat-preserving container 1 inside and outside wall outside, its data line that connects electrically heated rod 5 and hygrosensor 6 links to each other with data collecting instrument 12 with voltage stabilizer 9 by trough 7 with power lead; Electrically heated rod 5 connects solid-state relay 10, and solid-state relay 10 is connected to above the voltage stabilizer 9; Simultaneously, solid-state relay 10 also is connected with data collecting instrument 12; Water temperature in hygrosensor 6 is measured in the thermotank 3 is judged according to water temperature to begin/stop heating then.Hygrosensor 6 directly is connected with data collecting instrument 12 by data line, and the signal that collects is changed, and directly is shown as temperature signal.The data acquisition module that data collecting instrument 12 is made for Mitsubishi, it is by conversion electric power 11 power supplies; Conversion electric power 11 converts the alternating current of 220V the direct current of 24V to, offers data collecting instrument 12 power supplies then.The temperature that solid-state relay 10 detects according to hygrosensor 6, disconnect/close circuit, make hygrosensor 6, solid-state relay 10, data collecting instrument 12 and computing machine 13 form the control section of this tester, thereby realize the automatic control of this phase change thermal storage tester.
See also shown in Figure 2, this control flow is: at first make electrically heated rod heat, carrying out temperature by hygrosensor then surveys, carry out data acquisition by data collecting instrument, the information of being gathered is sent into computing machine to be handled, carry out heat time heating time after the processing and judge, heat by electrically heated rod less than then continuing as spending heat time heating time, if heat time heating time to disconnect solid-state relay and stop to heat.
After having realized whole test process, the data of gathering are calculated.Before the amount of stored heat of calculating phase-change material, at first to carry out error and check this phase change thermal storage tester, mainly be divided into two steps: leak heat test and thermal capacitance test.Because this phase change thermal storage tester mainly is made up of a water-bath, and is provided with electrically heated rod in water-bath, therefore need the leaking heat and the caloric receptivity of the whole water-bath of calculating system.Leaking heat promptly is that water-bath is being carried out in the heating process, the heat that water-bath discharges to environment; Caloric receptivity promptly is in heating process, the heat that whole water-bath system is absorbed.Leaking heat is the temperature difference of the inside and outside wall of outer heat-preserving container, the function of heat time heating time and the hot coefficient of leakage; Caloric receptivity is that thermal capacitance and heating are opened, the function of the temperature difference of stopping time water-bath.
Main formulas for calculating is as follows:
1. leak the test of hot coefficient:
In the formula: k leaks hot coefficient, W/ ℃;
w
1Be to leak hot heating power, W;
Δ T
1Be the temperature difference of outer heat-preserving container inside and outside wall, ℃;
2. system's thermal capacitance
Q
1＝c·ΔT
2 (5)
In the formula, the thermal capacitance J/ of c system ℃;
Δ T
2The temperature that water raises, ℃;
The t test duration, s;
The Q heating rod add heat, J;
Q
1The heat that system's (comprising interior thermotank, outer heat-preserving container, water) absorbs, J;
Q
2Leaking heat in the heating process, J;
3. the calculating of phase-change material amount of stored heat
Q
pcm＝q·m (7)
In the formula: q is the phase-transition heat-storage amount of phase-change material unit mass, J/kg;
M is the quality of phase-change material, kg;
Q
PcmBe the amount of stored heat of building phase-change material, J;
w
2Be phase transformation test heating power, W;
At first in interior thermotank 3, add water,, stop to add water when the scale mark place of water in the interior thermotank; Heating bung 4 in covering then covers outer insulation bung 2 afterwards again.The preliminary work of water-bath part is finished, and can control heating to it.And then open 13 computing machines, and the voltage stabilizer 9 and the data collecting instrument 12 of thermotank 3 are powered, heating setting on 13 computing machines, finished simultaneously.This mainly comprises phase transition temperature that phase-change material is set, be set the heat time heating time of Lou heat test and thermal capacitance test, the leakage thermal power that heat is tested with Louing is set.After these three settings are finished, click the start button on the interface, the heating beginning.6 per 5 seconds gathered a secondary data by hygrosensor, and are translated into temperature value, are presented on computing machine 13 interfaces, simultaneously the data that collect are depicted as level and smooth curve of curve, show on computing machine 13 interfaces.
After time to be heated reached the heat time heating time of setting, computing machine 13 control solid-state relay 10 automatically disconnected the power supply of electrically heated rods 5, and heating at this moment stops.Calculate according to gathering the data of returning then.
The first step: calculate the hot coefficient of leakage according to formula (1).
Second step: according to formula (2), (3), (4), (5) computing system thermal capacitance.
Carry out the amount of stored heat test experiments of phase-change material then.
Water in the interior thermotank 3 is poured out, to be heated in bucket 3 and the temperature cool to room temperature of outer heat-preserving container 1 inside and outside wall the time, begin to carry out the phase-transition heat-storage test experiments.At first phase-change material is put into thermotank 3, internally added water in the thermotank 3 again then, in water level reaches, stop to add water in the thermotank 3 during scale mark.Heating bung 4 and outer insulation bung 2 in covering successively then.Open 13 computing machines, and the voltage stabilizer 9 and the data collecting instrument 12 of thermotank are powered, on computing machine 13, finish heating setting simultaneously.This mainly comprises phase transition temperature, phase transformation test heat time heating time that phase-change material is set and the heating power that the phase-transition heat-storage test is set, and clicks the start button on the interface, the heating beginning.6 per 5 seconds gathered a secondary data by hygrosensor, and are translated into temperature value, are presented on computing machine 13 interfaces, simultaneously the data that collect are depicted as level and smooth curve of curve, show on computing machine 13 interfaces.Time to be heated reaches the phase-transition heat-storage of setting after the test duration, and computing machine 13 is the power supply of control solid-state relay 10 disconnection electrically heated rods 5 automatically, and heating at this moment stops.
Go on foot hot coefficient of leakage and the thermal capacitance of calculating according to the first step and second at last, and then calculate the amount of stored heat of phase-change material according to formula (6), (7), (8).
Claims (3)
1, a kind of phase change thermal storage tester is characterized in that: this tester is by water-bath, voltage stabilizer, and solid-state relay, power supply changeover device, hygrosensor, data collecting instrument and computing machine are formed; Should:
Water-bath by the good outer heat-preserving container (1) of effect of heat insulation, be incubated bung (2), interior thermotank (3), interior heating bung (4) and electrically heated rod (5) outward and form; This outer heat-preserving container (1) is divided into inside and outside two-layer, and interlayer is a polyurethane heat insulation material, is covered with outer insulation bung (2) outside on the bung of heat-preserving container (1); Should be placed on outer heat-preserving container (1) inside by interior thermotank (3), heating bung (4) on the bung of interior thermotank (3), being covered with, and be provided with electrically heated rod (5) in the bottom of interior thermotank (3), in interior thermotank (3), be provided with the temperature sensing point, be used to test the size of water temperature; Also respectively be provided with the temperature sensing point, the temperature that is used to test the inside and outside wall of outer heat-preserving container on the inside and outside wall of heat-preserving container (1) outside; The data line that connects this electrically heated rod (5) and hygrosensor (6) links to each other with data collecting instrument (12) with voltage stabilizer (9) by trough (7) with power lead, and this electrically heated rod (5) is connected with solid-state relay (10) simultaneously;
Voltage stabilizer (9) connects 220V power supply (8) and solid-state relay (10) respectively, and this voltage stabilizer (9) is in order to guarantee the stable of heating power, therefore must to keep stable voltage;
Solid-state relay (10) connects voltage stabilizer (9) respectively, also connects data collecting instrument (12) by power supply changeover device (11), and this solid-state relay (10) and data collecting instrument (12) are controlled the start and stop of heating process jointly;
One end of power supply changeover device (11) is connected with solid-state relay (10), and the other end links to each other with data collecting instrument (12), and it is that data collecting instrument (12) provides power supply that the 220V voltage transitions is become 24V;
Water temperature in hygrosensor (6) test in the thermotank (3), and judge according to the survey water temperature and to begin/to stop to heat that this hygrosensor (6) directly is connected with data collecting instrument (12);
Data collecting instrument (12) directly connects hygrosensor (6), after converting the voltage/current signals of gathering to temperature signal, input computing machine (13) also shows on computing machine (13) interface, and then according to the amount of stored heat of gathering the temperature computation phase-change material of returning;
Computing machine (13) links to each other with data collecting instrument (12), and this computing machine (13) is used for control and finishes the whole operation process, comprises opening, stopping of heating process, image data, the size of calculating and change heating power.
2, phase change thermal storage tester according to claim 1 is characterized in that: this hygrosensor (6) is made up of thermocouple temperature sensor, is used for surveying the temperature of water, and analog electrical signal is converted to temperature signal.
3, phase change thermal storage tester according to claim 1 is characterized in that: this data collecting instrument (12) uses the Mitsubishi PLC programmable software, makes the user directly carry out control operation on computing machine (13) interface.
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| CN2008102226083A CN101358940B (en) | 2008-09-18 | 2008-09-18 | Phase change heat storage tester |
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| CN2008102226083A CN101358940B (en) | 2008-09-18 | 2008-09-18 | Phase change heat storage tester |
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| CN101358940A true CN101358940A (en) | 2009-02-04 |
| CN101358940B CN101358940B (en) | 2011-11-09 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101839873A (en) * | 2010-04-23 | 2010-09-22 | 中国建筑材料科学研究总院 | Testing device and testing method for thermal performance of phase-change temperature regulation building material |
| CN101957331A (en) * | 2010-03-16 | 2011-01-26 | 浙江工业大学 | Phase change thermography display system based on image processing algorithm |
| CN101975792A (en) * | 2010-09-14 | 2011-02-16 | 中国科学技术大学 | System for testing stability of solid-liquid phase change materials |
| CN102590263A (en) * | 2012-03-08 | 2012-07-18 | 北京工业大学 | Device and method for measuring phase change latent heat of composite phase change energy storage material |
| CN102721720A (en) * | 2012-05-17 | 2012-10-10 | 中国建筑材料科学研究总院 | Device and method for testing thermal performance of phase-change energy-storage composite board, and method for evaluating energy saving of same |
| CN104132958A (en) * | 2014-05-07 | 2014-11-05 | 北京工业大学 | Phase change member heat storage-release performance study experiment table and application thereof |
| CN104569036A (en) * | 2015-01-08 | 2015-04-29 | 安徽大学 | In-situ detection method for phase change process of crystalline polymer |
| CN104677933A (en) * | 2015-02-28 | 2015-06-03 | 陕西理工学院 | Test device for stored/released energy of shaped phase-change material |
| CN105675647A (en) * | 2016-03-25 | 2016-06-15 | 华北水利水电大学 | Phase-change heat storage testing device and phase-change heat storage testing method |
| CN110568006A (en) * | 2018-06-06 | 2019-12-13 | 全球能源互联网研究院有限公司 | Heat storage density testing method and system for heat storage material |
| CN110873670A (en) * | 2018-09-04 | 2020-03-10 | 中国科学院大连化学物理研究所 | Full-automatic multi-channel phase change material cycle life testing device and method |
| CN111610222A (en) * | 2019-05-22 | 2020-09-01 | 北新集团建材股份有限公司 | System and method for detecting temperature regulation performance of phase change material |
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- 2008-09-18 CN CN2008102226083A patent/CN101358940B/en not_active Expired - Fee Related
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| CN101839873A (en) * | 2010-04-23 | 2010-09-22 | 中国建筑材料科学研究总院 | Testing device and testing method for thermal performance of phase-change temperature regulation building material |
| CN101975792A (en) * | 2010-09-14 | 2011-02-16 | 中国科学技术大学 | System for testing stability of solid-liquid phase change materials |
| CN101975792B (en) * | 2010-09-14 | 2013-06-26 | 中国科学技术大学 | System for testing stability of solid-liquid phase change materials |
| CN102590263A (en) * | 2012-03-08 | 2012-07-18 | 北京工业大学 | Device and method for measuring phase change latent heat of composite phase change energy storage material |
| CN102721720A (en) * | 2012-05-17 | 2012-10-10 | 中国建筑材料科学研究总院 | Device and method for testing thermal performance of phase-change energy-storage composite board, and method for evaluating energy saving of same |
| CN104132958A (en) * | 2014-05-07 | 2014-11-05 | 北京工业大学 | Phase change member heat storage-release performance study experiment table and application thereof |
| CN104569036A (en) * | 2015-01-08 | 2015-04-29 | 安徽大学 | In-situ detection method for phase change process of crystalline polymer |
| CN104569036B (en) * | 2015-01-08 | 2017-09-01 | 安徽大学 | In-situ detection method for phase change process of crystalline polymer |
| CN104677933B (en) * | 2015-02-28 | 2017-06-23 | 陕西理工学院 | A kind of sizing phase-change material stores/releases energy test device |
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| CN105675647A (en) * | 2016-03-25 | 2016-06-15 | 华北水利水电大学 | Phase-change heat storage testing device and phase-change heat storage testing method |
| CN110568006A (en) * | 2018-06-06 | 2019-12-13 | 全球能源互联网研究院有限公司 | Heat storage density testing method and system for heat storage material |
| CN110568006B (en) * | 2018-06-06 | 2022-06-28 | 全球能源互联网研究院有限公司 | Heat storage density testing method and system for heat storage material |
| CN110873670A (en) * | 2018-09-04 | 2020-03-10 | 中国科学院大连化学物理研究所 | Full-automatic multi-channel phase change material cycle life testing device and method |
| CN111610222A (en) * | 2019-05-22 | 2020-09-01 | 北新集团建材股份有限公司 | System and method for detecting temperature regulation performance of phase change material |
| CN111610222B (en) * | 2019-05-22 | 2022-04-15 | 北新集团建材股份有限公司 | System and method for detecting temperature regulation performance of phase change material |
| CN111830081A (en) * | 2020-06-30 | 2020-10-27 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Method and device for measuring latent heat of fusion of phase change material |
| CN111830081B (en) * | 2020-06-30 | 2023-02-24 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Method and device for measuring latent heat of fusion of phase change material |
| CN114544702A (en) * | 2022-04-27 | 2022-05-27 | 江苏宇晗数据科技有限公司 | Online monitoring equipment for heat storage capacity of soil layer of tunnel wall |
| CN114544702B (en) * | 2022-04-27 | 2022-12-20 | 江苏宇晗数据科技有限公司 | Online monitoring equipment for heat storage capacity of soil layer of tunnel wall |
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