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光明化工研究所研制的低温可变小温差导热系数测定装置于1989年7月14日通过了化工部的视同鉴定,该装置采用增大热容量的蓄冷器作为可变浮动热沉,利用冷介质的蒸发潜热和自动补偿加热功率,实现测定非金属固体和散料在-196℃至常温下的导热系数。控制测定样品冷热端温差在10K以内,使测定值接近于微分导热系数,并具
The low temperature variable small temperature difference thermal conductivity measuring device developed by Guangming Chemical Industry Research Institute passed the appraisal of the Ministry of Chemical Industry on July 14, 1989. The device uses the regenerative capacity increasing regenerator as the variable floating heat sink, and utilizes the cold medium Of the latent heat of evaporation and automatically compensate for the heating power to achieve the determination of the thermal conductivity of non-metallic solids and bulk materials at -196 ℃ to room temperature. Control the temperature difference between the sample hot and cold side within 10K, the measured value close to the differential thermal conductivity, and with