相变储能石膏板导热系数2种测试方法的研究

Experimental Investigation of Thermal Conductivity of Phase Change Energy Storage Plasterboard in Two Test Methods

相变储能石膏板导热系数的测试多采用单一的非稳态测试方法,为更好表征相变储能石膏板导热系数的变化规律,分别采用稳态测试方法(防护热板法)和非稳态测试方法研究了相同配合比相变储能石膏板的导热系数.分析比较发现:随着相变材料掺量的增大,石膏基相变储能构件的导热系数降低;2种测试方法均能反映相变储能石膏板导热系数的变化规律,初始温度在相变温度区间时,试件的导热系数值最大;非稳态测试得到的导热系数值较大.

Though the thermal conductivity of phase change energy storage plasterboard was usually tested by unsteady method, a stable method was proposed to investigate the change of thermal conductivity of phase change energy storage plasterboard. Two testing methods, steady state test method of protection hot plate method and unsteady test method, were compared in the measurement of the thermal conductivity of the phase change energy storage plasterboard with the same proportions. By the analysis and comparison of the two kinds of test methods, the thermal conductivity will decrease with the addition content of phase change materials increasing; both methods can reflect the changes of the thermal conductivity, and the thermal conductivity will be highest if the initial plasterboard temperature is within the phase change temperature interval; the result of thermal conductivity measured by unsteady test method is larger than that of steady test method.