Method for quantitatively measuring net radiant heat flow of outer surface of building envelope based on infrared imaging technology

Abstract

The existing method for measuring the radiant heat flow of a building envelope has the two problems of (1) larger error and (2) low measurement efficiency. In order to overcome the defects of the radiant heat flow measuring method, the invention provides a method for quantitatively measuring the net radiation heat flow of the outer surface of a building envelope based on an infrared imaging technology. On the basis of the Stefan-Boltzmann law, the infrared thermal imaging technology and infrared thermal imaging processing software are adopted, so that the net radiant heat flow of the outer surface of an envelope can be rapidly calculated in different regions and under different building conditions, and the defects of existing radiant heat flow measurement are well overcome.

Description

(1) Technical field [0001] The invention belongs to the technical field of building detection, and specifically relates to a method for quantitatively measuring the net radiant heat flow on the outer surface of a building envelope based on infrared imaging technology, the purpose of which is to conveniently detect the net radiant heat flow on the outer surface of the building envelope . (2) Background technology [0002] The radiant heat flow of a building is an extremely important part of the energy consumption analysis of the building envelope. In order to obtain the radiant heat flow, it is necessary to use tools and equipment to measure the outer surface of the envelope. Currently, the radiant heat of the outer surface of the building envelope is measured The conventional method of flow rate is the heat flow meter method. The principle of the heat flow meter method is to use the heat flow meter and related parameter measurement tools (thermometer, anemometer, etc.), aft...

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Problems solved by technology

Marshall et al. [2] used the linearization method in the calculation formula of radiation heat flux. The third power of the surface temperature used involved the linearization of Stefan Boltzmann's law. The specific expression they proposed was as follows: Madding[3] also uses the linearization method, and the expression is very close to that of Marshall et al. [28], but he changes the cubic term of temperature into the average value of surface temperature and reflected temperature. The specific expression he proposed is as follows: in The above three measurement methods are measured by the heat flow meter method, the measurement period is long, and the measurement accuracy is low, resulting in inaccurate calculation results

[0004] To sum up, there are two problems in the existing measurement methods of radiation heat flow of building envelope structures: (1) large error and (2) low measurement efficiency

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