Measurement system and method for building material surface convective heat exchange coefficient

Abstract

The invention discloses a measurement system for a building material surface convective heat exchange coefficient. The measurement system consists of a thermal insulation box, industrial fan, an anemometer, a small automatic weather station, thermocouple temperature sensors, an air temperature sensor, a water temperature sensor and a building material test piece. Thermal insulation box and the building material test piece compose an enclosed box; the water temperature sensor is disposed in the thermal insulation box; the thermocouple temperature sensors are disposed on the surface of the building material test piece; the air temperature sensor is arranged in an external environment; and the thermocouple temperature sensors, the air temperature sensor, the water temperature sensor and the anemometer are all connected to the small automatic weather station for real-time acquisition and storage of test data. Based on the theory of heat transfer, the measurement system and method providedby the invention can achieve efficient, simple and accurate measurement of the convective heat exchange coefficient between a building material and the external environment, also take the heat absorption and heat release processes into account, can better simulate the thermal behavior of an actual engineering structural material in a service environment, and have good application prospects.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a measurement system and method for the surface convective heat transfer coefficient of building materials. Background technique [0002] Civil engineering infrastructure is exposed to the external natural environment and is affected by the external climate, resulting in changes in the temperature of the structure. Thermal expansion and contraction of materials cause mechanical responses of the structure, such as changes in displacement, stress, strain, and support reaction. For some temperature-sensitive buildings, such as bridges and long-span space structures, the mechanical response caused by temperature loads can reach or even exceed the structural response caused by external operating loads, which is the main reason for structural damage, disease and performance degradation. To analyze the temperature effect of components, it is first necessary to accurately calculate the ...

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Problems solved by technology

The heat convection coefficient of materials based on the structural field temperature test and theoretical regression reflects the real service state of the material, but there are too many factors coupled, such as heat conduction and heat radiation, and the external climate environment parameters are too regional and time-varying to be difficult. Accurate calculation makes it difficult to guarantee the reliability and universality of the thermal convection coefficient based on the regression of measured data

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