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

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.

Description

technical field [0001] The invention belongs to the on-site detection technology of thermal resistance of an enclosure structure, in particular to an on-site measurement method for improving the accuracy of detecting the thermal resistance of an enclosure structure by a heat flow meter method. Background technique [0002] In my country, building energy consumption accounts for nearly 30% of the social terminal energy consumption, becoming one of the three major energy consumption alongside industrial energy consumption and transportation energy consumption. Among them, the heat consumption of the envelope structure accounts for 73-77% of the energy consumption of the entire building. Therefore, the envelope structure is the decisive factor affecting the energy consumption of the building, and it is also the focus of building energy conservation research. Its heat transfer coefficient is an important factor for heat insulation and Insulation indicators, various energy-saving...

AI 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 difference, and its size is related to factors such as the surface properties of the wall and the heat flow meter, and environmental conditions. In severe cases, it will bring great errors to the detection of thermal resistance.

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