A NEW SOLAR SHADING SYSTEM WITH PHASE CHANGE MATERIAL (PCM)

摘要

The purpose of this work was to design a new PCM-shading system and the investigation of its thermalperformance. The employed PCMs were tested for their thermal (enthalpy, thermal conductivity, heatcapacity) and mechanical properties (volume change, density). Also three system designs and means ofencapsulation were investigated.The thermal performance of the PCM shading system was tested with a newly built apparatus in whichthe sample is irradiated with a metal halide lamp used as solar simulation unit. Measurements on smallunits (i.e. one slat) of the PCM-shading system have been carried out, to determine the temperaturedistribution for the different designs and to validate the numerical model. Measurements with the solarsimulator and numerical simulations were found to be in good agreement.First measurements of a complete PCM-shading system under real conditions were carried out in a southfacing office of the ZAE Bayern in Wuerzburg, Germany. The PCM used in this case was paraffin with amelting point of 24℃. The temperature rise of the shading system upon full solar irradiation could bedelayed for 3.2 hours.