Runsheng Tang

Heat storage performance of the binary systems neopentyl glycol/pentaerythritol and neopentyl glycol/trihydroxy methyl-aminomethane as solid–solid phase change materials

In this work, an experimental study was conducted to investigate the heat storage performance of solid–solid phase change materials including the binary systems of NPG/PE and NPG/TAM, consisting of NPG (neopentyl glycol, C5H12O2, PE (pentaerythritol, C5H12O4) and TAM (trihydroxy methyl-aminomethane, C4H11O3N).

Progress in Building Integration of Solar Systems in Yunnan, China

Yunnan is one of the less developed provinces of China, but has abundant solar energy resource and the most users of solar water heaters due to the perfect climate. Recent years, building integration of solar energy systems (referred to as BIOSES in this paper) is gaining great attention. This communication briefs the achievements in the BIOSES in Yunnan of China, and some successful illustrative projects are presented. Issues of the most concern and interest, which is resisting a further development of the BIOSES are identified and discussed.

On the Anti-Freezing of Flat-Plate Collectors in Sdhws Under Climatic Conditions of Yunnan, China

Solar domestic hot water systems (referred to as SDHWS in the paper) with flat-plate collectors have been widely installed in residential and office buildings for the water heating due to their reliable performance, low cost and minimal need for maintenance. However, the substantial fear of the damaging due to the freezing of collectors has apparently hampered their popularization in the areas with cold winters, even in the areas with mild winters. Just like a water pipe, one approach to the anti-freezing of collectors is to make the water inside the collectors flow. For a thermosyphonic SDHWS, this can be achieved by appropriate measures which make the systems produce thermosyphonic or reverse circulation. The object of this study is to investigate the temperature depression of collector absorbers at nights and the feasibility to employ reverse flow of thermosyphonic SDHWS for anti-freezing under climatic conditions of Yunnan, China.