Analysis of Thermal Performance of Hot Water System with the Solar Collector of a Heat Pipe Type Concentric Evacuated Tube

摘要

In the present study, a concentric evacuated tube solar collector with axially grooved heat pipe was investigated experimentally under the weather field conditions of Jinju, Korea. The collector was designed, constructed, and tested at transient conditions to study its performance for different cooling water mass flow rates as well as different inlet cooling water temperatures. Under different climate conditions of Jinju, the experimental results showed that the optimal mass flow rate is very close to the ASHRAE standard mass flow rate for testing conventional flat-plate solar collectors. So, the experimental results indicated that the mass flow rate has a significant effect on the collector efficiency. Subsequently, long term thermal performance of system can be predicted by using TRNSYS model under the weather condition for Jinju, Korea. The annual solar fraction is about 73% for all the hot water system of a house of four people in summer.