| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 102 === For solving the problems of global warming and environmental pollution, renewable energy has become the most important issue in recent years, especially the solar energy. Improving the efficiency of the solar energy application technology is imperative.
This research addresses the effects of the storage tank design parameters on the performance of a large-scale solar water heating system. Most literatures only considered the stratification performance of the thermal storage tank itself instead of considering the overall system performance. Also, there is lack of experimental research data available for the design purpose. Therefore, this study employs a numerical simulation technique to study the design parameters effect of a horizontal thermal storage tank on the performance of a large-scale solar water heating system.
In this study, the ANSYS-CFX program is employed to calculate the flow and temperature distributions inside horizontal thermal storage tank. Then the inlets and outlets of the tank are combined with the TRNSYS program to simulate the entire system performance under the weather of three representative cities of Taiwan, (Taipei, Taichung and, Kaohsiung) the results of the present study indicate that the stratification baffles in the tank have important effects on system performance improvement. Quantitative increase of solar fraction of the total load is obtained. The comparison with the system with vertical storage tank is provided.
The results of the present study can provide important reference for the large solar hot water system design in improving system efficiency.
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