Method for measuring heat storage coefficient based on thermoelastic damping theory

Abstract

The invention discloses a method for measuring a heat storage coefficient based on a thermoelastic damping theory, which comprises the following steps: 1) establishing a theoretical damping model; 2) establishing an experimental damping model by collecting test data; 3) optimizing the theoretical damping model in a step 1) and the experimental damping model in a step 2) to obtain the heat storage coefficient, so that only the changing relation of thermal flow and temperature on the surface is required for measuring, the thermal flow and temperature on the other surfaces are not required for measuring, the heat storage coefficient of certain surface of the material can be calculated without measuring the material density, thermal conductivity coefficient and specific heat capacity, so that the moisture content, penetrability and damage degree of the material can be easily obtained from the measured heat storage coefficient, the whole measuring process takes short time and easy procedure, the measuring method can be used in laboratory experiments and field detection of engineering.

Description

technical field [0001] The invention relates to a method for measuring heat storage coefficient, in particular to a method for measuring heat storage coefficient based on thermal damping theory. Background technique [0002] Definition of heat storage coefficient of materials and thermal characteristic index in building thermal engineering design [0003] 1. Material heat storage coefficient definition [0004] (1) Simple harmonic heat action [0005] as attached figure 1 The simplest and basic periodic heat action shown is simple harmonic heat action, that is, the temperature changes with time as a sine or cosine function. [0006] [0007] In the formula: --exist The medium temperature at the time, ℃; [0008] ——the average temperature of the medium in one cycle, °C; [0009] —The amplitude of the temperature wave, that is, the difference between the highest temperature and the average temperature of the medium, °C; [0010] T ——period of temperature wav...

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Problems solved by technology

[0030] Determining the heat storage coefficient of a material requires the determination of the material density, especially the heat flow and temperature on multiple surfaces of the material to determine the material density, thermal conductivity and specific heat capacity, which makes the test method complicated and takes a long time, which is not conducive to engineering site testing ; Since the moisture content, permeability, and damage of the material change with the heat storage coefficient of the material, how to quickly measure the heat storage coefficient of the material has become a problem worthy of consideration in thermal experiments and testing

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