If a J-type shell is selected which means divided flow at shell side, can i proceede with calculations by assuming two independent shells on either side of the divider? To elaborate my question a bit more I wish to say that can i divide the mass flow rate by two and can calculate pressure drop and shell side heat transfer coefficient separately for both parts and then later on adding the two sides. What is the right procedure for doing calculations with j-type shell?
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Jim Grant Forum Moderator 114 Posts
Re:2 August 2006 at 1:29pmThe J shell can be constructed in one of two different fashions - 2 inlet nozzles and one exit OR 1 inlet nozzle and 2 exit nozzles. If the inlet flow is divided by using 2 inlet nozzles then the crossflow velocity is 50% of what it would be in an E shell. If you choose to divide the flow and calculate the pressure drop of each half you cannot add them together to get the total pressure drop. The total pressure drop is equal to the pressure drop of each flow path as they both meet at the center of the exchanger and discharge through the common exit nozzle. Similarly the heat transfer coefficient should be identical for each flow path and not additive to get a total. The area, however, is additive if you choose to look at it as two separate shells.