Experimental study of heat transfer characteristics of solar water heater collector with addition wavyfins on pipe

Utilize the potential of solar energy there are two kinds technology already applied, there are solar thermal technology and solar photovoltaic. Solar water heater collector is one of the utilized solar energy. One way to improve the efficiency of collector solar water heating is to add external fins on pipes. This experimental was carried in environment Mechanical Engineering ITS, located in -7.27°LS and -112.79°BT. It is used to cover clear glass with angle of solar collector 10° and flow rate variation 75 l/h, 150 l/h and 225 l/h. Date is collected every one hour from 09.00 am - 15.00 pm for each variation. The measured parameters are upside glass temperature, underside glass temperature, water input, water output, pipe, absorber plate, surrounding, solar radiation and wind speed. The results obtained from this study are the highest efficiency of collector at the flow rate of 225 l/h is 63.87%, and the highest outlet temperature of water at the flow rate of 75 l/h is 46°C. The addition of wavy fins on pipes can improve the efficiency of the collector.