Numerical simulation study for the performance of a Large Solar Hot Water System with a Stratification Storage Tank for Various Load time

• Main Authors: Chin-Yen Su, 蘇琴硯
• Other Authors: Ru Yang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/28779804165998380216

碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 101 === In order to reduce global warming, the development of renewable energy sources is imperative. One of the most viable solar energy utility is the solar hot water system. In this study, a three-dimensional CFD program is employed to simulate the field in the storage tank of a large solar hot water system. The storage tank simulation is coupled with a system simulation program, TRNSYS, to simulate the entire solar hot water system. The parameters for the storage tank including the number of stratification baffles in the tank and the location of hot water outlet are studied. Also, the effects of the load supplying time on the system performance are studied including tL1 (12:00 to 18:00), tL2 (12:00 to 00:00) and tL3 (24hr). The study was done for three representative cities in Taiwan, i.e. Taipei、Taichung and Kaohsiung. The results indicate that the case with load time tL1 provides the best solar fraction. The more the number of baffles in the storage tank, the better the thermal stratification and therefore the better the system performance can be achieved. The results of the present study can provide system design references.