Studi Eksperimental Pengaruh Transparansi Kaca Penutup terhadap Laju Perpindahan Panas pada Prototype Kolektor Plat Datar

Abstract

Glass as a collector cover has a very important role in increasing the efficiency of flat plate collectors to reduce the heat coming out of the collector. The heat absorbed by the absorber plate will experience convection, radiation, and conduction transfer due to differences in indoor temperature, materials, and the environment. Many equations have been proposed to calculate the heat transfer rate from the top of the collector but do not consider the transparency of the cover glass. Therefore, it is necessary to conduct research in analyzing the effect of glass transparency on heat transfer rate as a collector cover media. In this study, a flat plate collector prototype was designed with both single and double cover glass transparency varied in three types, namely clear glass (93% transparency), rayben glass (40% transparency), and white painted glass (not transparent). On the sides of the collector, to reduce the occurrence of heat transfer to the environment, an insulator is used, namely glasswool. Then the top of the collector is equipped with a water circulation container to keep the ambient temperature constant during the test. The heat source on the absorber plate is electromagnetic heat called a heater. The heat on the absorber plate is varied in three types, namely temperatures of 80 ℃, 100 ℃, and 120 ℃. In this study, data on power charge and temperature were taken for 1 hour of testing for each variation of cover glass when the temperature was constant. The results showed that the transparency of the collector cover glass affects the heat transfer rate of the flat plate collector. Theoretically, the value of heat transfer rate on clear cover glass, both single and double is higher than rayben cover glass and white paint cover glass. Then actually, the value of the power charge on the clear cover glass, both single and double is greater than the rayben glass and white paint glass.