Measuring method for on-site detection of thermal resistance of enclosing structure

An enclosure structure, on-site detection technology, applied in the direction of material thermal development, material thermal conductivity, etc., can solve problems such as thermal resistance detection error, and achieve the effect of reducing influence and error.

Inactive Publication Date: 2010-09-15
XI AN JIAOTONG UNIV
3 Cites 14 Cited by

AI-Extracted Technical Summary

Problems solved by technology

In the actual test, since the paste of the heat flow meter will change the local heat transfer state of the wall (both radiation and convective heat transfer will change), Q 0 and Q 1 There will be a certain differenc...
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Abstract

The invention discloses a measuring method for on-site detection of thermal resistance of an enclosing structure. During measurement, a temperature measuring point on an inner wall surface is arranged on an adhering surface of a heat flow meter and a wall body surface, instead of a wall surface near the heat flow meter serving as the inner wall surface temperature measuring point in the prior art. Therefore, the measured heat flow corresponds to the temperature difference; and the calculation of the thermal resistance is not influenced under the condition that the tested part is in one-dimensional heat transfer. In the steady state, a calculation formula of the thermal resistance is: R=Delta T/Q, wherein Delta T refers to the difference between the temperature of the measuring point on the inner surface and the temperature of the measuring point on the outer surface, and Q refers to the heat flow of the heat flow meter reaction. Compared with the conventional measuring method, the measuring method of the invention can directly calculate the heat flow measured on site without error correction, can effectively reduce the influence of indoor environment condition and heat flow meter-added thermal resistance on the on-site measurement of the heat flow meter, provides more reasonable on-site measurement data for subsequent calculation, and reduces the error of the thermal resistance of the enclosing structure detected by the heat flow meter method.

Application Domain

Technology Topic

Heat flowBody surface +4

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  • Measuring method for on-site detection of thermal resistance of enclosing structure
  • Measuring method for on-site detection of thermal resistance of enclosing structure
  • Measuring method for on-site detection of thermal resistance of enclosing structure

Examples

  • Experimental program(1)

Example Embodiment

[0012] The present invention will be further described in detail below in conjunction with the drawings.
[0013] See figure 2 In view of the errors in the field test process of the existing heat flow meter method, the present invention will extract the temperature of the heat flow meter and the wall bonding surface, that is, the temperature signal of the heat flow meter bonding surface to replace the temperature of the wall surface near the original heat flow meter. The measured heat flow corresponds to the temperature difference, so when the test part is one-dimensional heat transfer, the calculation of thermal resistance will not be affected. The calculation formula in the steady state is: R=ΔT/Q, ΔT is the temperature of the inner surface The difference with the outer surface temperature, Q is the heat flow of the heat flow meter reaction.
[0014] During installation, install the thermocouples on the inner and outer wall surfaces of the tested enclosure structure respectively, and then install the heat flow meter on the inner wall surface of the tested enclosure structure and cover the thermocouple on the inner side to extract the heat flow meter and The temperature of the adhesive surface of the wall replaces the temperature of the wall near the original heat flow meter, and the temperature detected by the inner and outer thermocouples and the data detected by the heat flow meter installed on the inner surface are sent to the inspection instrument through the signal line.
[0015] From figure 2 It can be seen that the heat flow and temperature tested at this time will be corresponding, so even if the surface condition of the heat flow meter is inconsistent with the surrounding wall, the temperature of the corresponding heat flow meter sticking surface will be different. In the field test focusing on the thermal resistance of the enclosure structure, this test method can effectively solve the impact of environmental conditions on the field measurement during the test.
[0016] Compared with the original measurement method, the present invention can: 1) neglect the influence of the additional thermal resistance of the heat flow meter; 2) reduce the influence of indoor convection and radiation on the heat flow measurement of the heat flow meter; 3) no need to correct the heat flow, one When maintaining the steady state, the thermal resistance of the envelope structure can be directly calculated.
[0017] In actual operation, in order to avoid the influence of the temperature sensor on the adhesive surface of the heat flow meter, the temperature sensor is not directly installed at the measuring point, but the temperature sensor is integrated on the substrate inside the heat flow meter.
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Description & Claims & Application Information

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