科研之友
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摘要
Based on heat balance and momentum balance among different components, dynamic models to predict the thermal performance of a domestic thermosyphon solar water heating system (TSWHS) were established. To validate these models, an outdoor experimental platform was built and tests were conducted on three typical summer days in Zhuhai city, China. Results indicate that the temperature rise of water in a tank predicted by these models agrees very well with experimental data. Therefore, these models were verified. Then, these models were used to investigate the effect of design parameters on the thermal performance of a TSWHS. For the TSWHS, results indicate that its air gap thickness prefers to be set at 25mm because the heat loss through its glass cover stops decreasing above this value; both the energy loss and the final temperature of water in the tank decrease with increasing water tank volume. Therefore, considering the balance between photo-thermal efficiency and water temperature requirement, the tank volume can be determined among 130-150L in this work. Because the improvement of energy gain from an optimal installation slope of the TSWHS cannot compensate for the operation and maintenance costs, the installation slope can be fixed at a value which is equal to the local latitude.
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