Thermal Performance Testing of Heat Pipe Evacuated Tube with Compound Parabolic Concentrating Solar Collector by ISO 9806-1

Solar collector is an important component of solar hot water system. The purpose of this research is design, fabricate and test thermal efficiency of the heat pipe evacuated tube with compound parabolic concentrating (CPC) solar collector. The advantage of this system is it produces hot water over a period of time without adjusting the direction of the CPC to track the sun. The thermal performance of solar collector is critically important for the end users in order to ensure the efficiency of the system. The testing of CPC according to ISO 9806 - 1 found that the thermal efficiency was equal to 78%. The heat loss coefficient of the solar collector a(1) and a(2) are equal to 3.55 and 0.06 W/m(2)-degrees C respectively. The mathematical model was developed to determine the energy production base on solar radiation and ambient temperature data of Phitsanulok province. It was found that the monthly average energy of the CPC produced throughout the year is equal to 286.16 kWh or equal to 3,433.87 kWh/year. (C) 2014 Elsevier Ltd.