Optimization of Thermal Performance on Evacuated Tube Solar Collector Water Heating System

摘要

Solar energy is considered one of the main alternative sources of energy to replace the dependency on other fossil resources. Solar water heating are very common systems, extensively used in many countries with high solar radiation potential. In this work, an experimental setup of evacuated tube solar collectors with U pipe is constructed to study the thermal performance and optimizes the working parameters using the Response Surface Methodology (RSM). The performance evaluation are carried based on heat extraction of U-pipe evacuated-tube solar collectors with three different arrangement of glass tubes with heat shields and various flow rate. A test system to evaluate the thermal performance of medium-temperature solar collectors is developed. The values of the daily useful energy gain, efficiency and solar fraction are obtained.............