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Title of article :
A new method to determine thermophysical properties of PCM-concrete brick
Author/Authors :
Cheng، نويسنده , , Rui and Pomianowski، نويسنده , , Michal and Wang، نويسنده , , Xin and Heiselberg، نويسنده , , Per and Zhang، نويسنده , , Yinping، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
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Abstract :
Accurate measurement of thermophysical properties of PCM-concrete brick is very important for simulation and evaluation of its energy saving performance. However, there is currently no effective way to accurately measure thermophysical properties of PCM-concrete brick. First we analyzed the shortcomings of using traditional testing methods to measure thermophysical properties of PCM-concrete brick. We then proposed a new method based on the inverse problem, which deals with the measurements of thermal conductivity and specific heat of PCM-concrete brick during the phase change process. The equivalent specific heat distributions of 4 wt% and 6 wt% PCM-concrete brick were determined using this method. We found that the accuracy (the relative error of the calculated cp based on the inverse problem and their real values ranges from 10.43% to 19.4%) was acceptable for engineering use. The influences of the temperature segments span and optimization algorithms were analyzed. The results showed that the Sequential Quadric Programming (SQP) method provides the highest accuracy and least complexity compared with the Particle Swarm Optimization and Genetic Optimization methods. Finally, we suggested how to apply this method to other similar problems to extend its application scope.
Keywords :
phase change material , Thermophysical properties , Inverse problem , Building material , Energy Storage
Journal title :
Applied Energy
Journal title :
Applied Energy
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