One-dimensional heat and moisture transfer characteristic parameter measurement test bench

Abstract

The invention discloses a testing platform for measuring characteristic parameters of one-dimensional heat and humidity transfer. The testing platform is characterized in that an absolute-dry cavity gas feeding system comprises a fan, a filtering net, a semiconductor refrigerating piece and a water collecting disc; a nitrogen feeding system comprises a nitrogen cylinder, a nitrogen inlet valve, a nitrogen feeding pipeline, a deionized water tank, a nitrogen inlet pipeline and a nitrogen outlet pipeline; an ultrasonic humidifying system comprises a deionized water feeding pipeline, a water tank, an ultrasonic oscillator, a deionized water discharging pipeline and a sewage discharging pipeline; and a sample fixing device is positioned between a constant-temperature and constant-humidity cavity and an absolute-dry cavity and comprises a sample positioning plate, an absolute-humidity insulating material, a measured porous medium, an openable and closable type sample feeding port, a humidity-sensor fixing plate and a pressing wedge block with telescopic sliding of a porous medium sample along the longitudinal direction. The testing platform disclosed by the invention has the advantages that the ambient temperatures at the two sides in one-dimensional direction of a sample can be independently and effectively controlled respectively, and the transfer of humidity in the direction near one dimension can be guaranteed.

Description

technical field [0001] The invention belongs to the field of testing equipment for heat and moisture physical properties of porous media, and relates to a one-dimensional heat and moisture transfer test bench, in particular to a test bench for ensuring moisture in building porous materials to perform one-dimensional heat and moisture transfer. Background technique [0002] At present, when selecting and designing the building envelope, in addition to considering the basic conditions that it can provide a safe and resistant to adverse external environment, more needs to be considered The relationship between the internal environment of the envelope and the comfort of the human body (such as indoor hot and humid environment). Therefore, it is particularly important to design the building envelope rationally under the premise of considering the heat and humidity performance of the envelope. However, due to the incompleteness of the wet environment theory and the complexity of ...

AI Technical Summary

Problems solved by technology

However, due to the imperfection of the wet environment theory and the complexity of the porous medium itself, there is no standardized measurement equipment with accurate control of the parameters for the measurement of the heat and moisture transfer characteristic parameters of porous building materials.

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