Apparatus and method for measuring thermal coefficients by adopting guarded thermal plate method

Abstract

The invention relates to an apparatus and a method for measuring thermal coefficients by adopting a guarded thermal plate method. The apparatus mainly comprises a main part, a cold source measuring and controlling system, a thermal source measuring and controlling system, an intelligent measuring apparatus, a computer transmitter, a semiconductor refrigerating power supply and a voltage-stabilized source, wherein the main part comprises a thermal plate, a cold plate and a test piece pressing system, the thermal plate comprises a back guard thermal plate, a main heating plate and a guard heating plate, the main heating plate comprises a main heater and a metal equalizing-heating plate, the guard heating plate comprises a guard heater and a metal equalizing-heating plate, the cold plate comprises an aluminum plate, a semiconductor refrigerator and a water cooling system; the cold source measuring and controlling system and the thermal source measuring and controlling system respectively provide a cold source of the cold plate and a thermal source of the back guard thermal plate and comprise two sets of precise thermostatic water baths with same structure; each precise thermostatic water bath comprises a refrigerating loop, a water bath, a water pump, a stirring system, a heating temperature-controlling system, a water temperature display, and the like; and the semiconductor refrigerating power supply is independent of the main part, the cold source measuring and controlling system and the thermal source measuring and controlling system, thereby the measurement accuracy of a thermal coefficient measuring apparatus is improved.

Description

technical field [0001] The invention relates to an instrument and a method for measuring thermal conductivity, in particular to an instrument and a method for measuring thermal conductivity by a protective hot plate method. Background technique [0002] Thermal conductivity is one of the thermal physical properties of thermal insulation materials, and it is an important indicator to identify the thermal insulation performance of materials. In recent years, the state has paid more and more attention to building energy conservation. Accurately measuring the thermal conductivity of insulation materials plays a key role in the correct use of building insulation materials and the saving of building energy consumption. Therefore, it is particularly important to accurately determine this parameter. [0003] The methods for determining the thermal conductivity of building materials can be divided into two categories: steady-state methods and unsteady-state methods. The various fo...

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