A flat plate solar heat collector having a dimensions of 160 cm X 110 cm X 12 cm meant for domestic use was designed and constructed, taking into consideration the reduced cost to encourage the commercial use. The radiation falls on the surface area of the assembled pipes through a clear glass of 4.0 mm thickness, used as cover and transparent to the short wave of solar radiation. These pipes (Ф 0.5?) were made of galvanized steel, which allow circulation of water inside the collector throughout its passes of heat collection. The collector piping system was made of eight ways and layed on equispaces in the sheet metal. All pipes material is made of relatively high thermal conductivity and low thermal capacity. A casing is used as to protect the absorber (piping & plate) and to support the cover; hence it helps to insulate the absorber from the surroundings. The collector was then installed on the top of the experimental house. Water with sufficient head was supplied from a reservoir tank and of about 7 meters above the collector. The collector under different tests during winter season gives a flow of 50 to 55 liters of hot water per day, with an average water temperature of 83.3 °C, while the winter room temperature is averaged at 12.8 °C.
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