Detection device and method for measuring component thermal conductivity and thermal resistance by dynamic hot box method

Abstract

The invention discloses a detection device and method for measuring the heat conduction coefficient and the heat resistance of a component by adopting a dynamic hot-box method, and mainly aims to provide a detection device and method for measuring the heat conduction coefficient and the heat resistance of the component with a cavity by adopting the dynamic hot-box method. The detection device comprises a protection box for accommodating a component, wherein the component separates the protection box into a hot chamber and a cold chamber; the component is internally provided with a running cavity; ventilation openings are formed in parts, corresponding to two ends of the cavity, on a box body of the protection box; the ventilation openings are provided with air flow guide devices. Because the cavity of the component is communicated with the atmosphere, by considering the fact that different atmosphere environments can affect the heat transfer property of the component, compared with a method in the prior art, the detection device and method are relatively suitable for the components with the cavities, and the obtained heat transfer coefficient and heat resistance are relatively almost close to the real values, and the detection device and method have the relatively guidance significance in practical application.

Description

technical field [0001] The invention relates to a detection device and method for measuring thermal conductivity and thermal resistance of components by a dynamic thermal box method. Background technique [0002] At present, the hot cell method for testing the thermal performance of the enclosure structure in the laboratory is carried out according to the current national standard "Determination of Steady-state Heat Transfer Properties of Building Components-Calibration and Protective Hot Cell Method" (GB / T13475-2008). The thermal cell method is divided into the protective thermal cell method and the calibration thermal cell method, both of which measure the heat transfer coefficient and thermal resistance of the component by simulating the boundary conditions of a fluid with a uniform temperature on both sides of the component. Specifically, the component is placed between a hot chamber and a cold chamber with a known ambient temperature, and the air temperature and surface...

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Problems solved by technology

[0003] However, some components are provided with a cavity, and the gas in the cavity communicates with the outside world, so the cavity will be affected by the atmospheric environment

Since the atmospheric environment is dynamic and varied, and the above method is based on the measurement of thermal resistance and heat transfer coefficient of static materials, when the above method is applied to components with cavities, it is impossible to detect the airflow in the cavity. How the thermal conductivity and thermal resistance affect the test results is not close to reality, so the above method is not suitable for the detection of thermal conductivity and thermal resistance of components with cavities

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