Papers by Author: Jun Fan

Abstract: Non condensable gas (air) accumulating in the condenser will reduce heat transfer coefficient of condense and vacuum value, Reducing of condenser vacuum value will lower turbine efficiency. Chilled water spraying is adopted to cool down the steam before it is extracted through extraction opening in condenser so as to enhance extraction effect of vacuum pump. This paper gives analysis on chilled water spraying through extraction opening. Mathematic model of selected controlling volume near extraction opening is given. Maximum amount of spraying and its relationship with vacuum value and increment of extraction rate are also proposed.

Abstract: In this paper it is shown that compacted wheat straw block is a cost effective building material in China. Wheat straw is renewable resource and ecological material, when used as building material; it is less energy and material consumption. The compacted wheat straw block has a small thermal diffusivity and good fire resistance. The hydraulic properties will guarantee a comfortable humidity of in door air, and protect the material from rot, and ensure the durability of the construction. The mechanical properties will also increase the structure safety. It is absolutely a cost effective building material.