Plate Heat Exchanger Channels And Passes
The passes refer to a set of parallel flow channels in the same flow direction of medium in a plate heat exchanger, and the flow path refers to a medium flow channel formed by two adjacent plates in a plate heat exchanger. In general, several flow passages are connected in parallel or in series to form different combinations of cold and heat medium passages.
The flow combination should be calculated based on heat transfer and fluid resistance and determined to meet process conditions. Try to make the convective heat transfer coefficient in the cold and hot water flow channels equal or close, so as to get the best heat transfer effect. The heat transfer coefficient obtains a larger value because the convective heat transfer coefficients on both sides of the heat transfer surface are equal or close. Although the flow rates between two plates not equal, the calculation is based on the average flow rate in the calculation of heat transfer and fluid resistance. Since the "U"-shaped single-flow nozzle is fixed on the frame plate, the disassembly and assembly is convenient.