DISTRIBUTED COOLING IN SPHELAR~? MODULES

摘要

The performance of a PV module under real operating conditions cannot be simply inferred from therated one. One of the reasons is overheating the cells. Sphelar? cells measure a mere 1.8 mm across and are spacedapart, which might permit generated heat to be dissipated efficiently. In this paper, thermal behavior of a laminatedglassSphelar? module is experimentally studied. For comparison, a commercially-available single-crystalline Siglass module is also used. They are irradiated (irradiance 1kW/m~2, AM1.5 spectrum) and their temperature rise isdynamically determined during module heating by the measured values of open circuit voltages and infraredthermography. Measurements have confirmed that the operating temperature of Sphelar? module following 33minutes exposure is just only about 7oC lower than that of the reference module. Infrared images suggest that theoperating temperature of the PVmodules is determined by the quantity of the deposited heat in the modules and poorrelease of heat from the module surface. Smilar analysis on a bare mesh of Sphelar? cells reveals that efficient heatdissipation due to distributed cooling is not fully realized without effort.