为什么HTFS计算面积相差一倍？ 见帮助文件： you can specify a minimum and maximum velocity for each side of the exchanger. in most cases only the minimum and maximum tube side velocity limits affect the design, since these affect the maximum and minimum limits on number of tubes per pass, and hence restrict the range of shell size investigated, for a given number of passes and shells in parallel. the restrictions on shell side velocities have a similar effect for axial shell side flows, but are not used for baffled or other crossflow exchangers. crossflow velocities have significant spatial variation within each baffle region and window flow, with potentially much higher than average values in some regions, such as adjacent to sealing strips and the baffle cut, and much lower than average values in other places, even including areas of recirculation just downs stream of the baffle cut. crossflow velocities in the program output are "nominal" velocities, which make no allowance for such effects. the ranges of baffle spacing and shell diameters permitted are the main parameters affecting shell side velocities, and these should be used instead of explicit velocity limit specification for baffled shell side exchangers.查看更多
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