Hence for conservative pressure drop estimate, physical properties of water are calculated at the inlet conditions. Shell and tube heat exchangers find their applications in a variety of sectors. L = length of tubes Allowable pressure drop. Imprint of heat transfer area. Tube side pressure drop is calculated using the same pipe flow factors developed in your fluid mechanics class. + ÎPtubes+ ÎPc, ÎPt = total pressure drop in the heat exchanger (tube The Heat Exchanger Design Handbook is quite good for calculating the shell-side pressure drop. Increasing the shell diameter increases tube flow area due to increased number of tubes and, thereby, reduces tube flow velocity and, hence, reduces tube side pressure drop. Consequently, pressure drop is reduced. Shell And Tube Heat Exchanger Shell Side Pressure Drop - posted in Student: Dear All, I am trying to calculate the pressure drop on shell side of the heat exchanger. The Excel formulas in the spreadsheet calculate the frictional head loss and pressure drop due to the straight pipe flow in much the same manner as in the shell and tube spreadsheet just discussed above. and expressed as : Î¦ = (Î¼/Î¼w)-0.25 Also in June of 2004 I wrote an article on this subject for Hydrocarbon Processing. Inlet pressure = 4 barg These are calculated using a pressure vessel design code such as the Boiler and Pressure Vessel code from ASME (American Society of Mechanical Engineers) and the British Master Pressure Vessel Standard, BS 5500. 3. Î¦ = correction factor for non isothermal flow. Î¼w = viscosity of the fluid at the wall temperature in tube Excel spreadsheet templates that carry out the first 5 steps of the preliminary heat exchanger design process given above for a shell and tube heat exchanger are discussed in, and can be downloaded (in U.S. and S.I. There is a couple of reasons for this, Increasing the tube pitch will result in increasing the Shell diameter for the heat exchanger, this will increase the equipment costs; Its better to reduce the pressure drop by modifying the baffle spacing, baffle cut or shell … Make a more detailed estimate of the overall heat transfer coefficient, U, based on the current configuration of the heat exchanger. to get a Estimate the pressure drop across the heat exchanger. Check out the latest downloads available in the File Library. However, it increases the cost due to the reasons as mentioned for shell side pressure drop. baffles, NB. R. Shankar Subramanian . Calculate the heat transfer rate, Q, in Btu/hr, based on specified information about fluid flow rates and temperatures. Moreover, reduction in baffle spacing leads to increased fraction of shell side flow by-passing the tube bundle, thereby, lowering the heat transfer. LMTD does not directly apply. For the double pipe heat exchanger design, however, there is an additional section for calculation of the âminor lossesâ due to all of the 180o bends. The pressure drop in the nozzles is calculated by : ÎPi = pressure drop in the inlet nozzle and the number of passes. The Excel spreadsheet template at the left will calculate the frictional head loss and frictional pressure drop across the tubes of a shell and tube heat exchanger for the flow of the tubeside fluid. Tube side pressure drop can be lowered in following ways: When the pressure drop is surplus, the objective of the thermal design of the exchanger should be to utilize the available pressure drop fully, i.e. Munson, B. R., Young, D. F., & Okiishi, T. H., Fundamentals of Fluid Mechanics, 4th Ed., New York: John Wiley and Sons, Inc, 2002. Increasing the shell diameter. EnggCyclopedia's Liquid Density Calculator, EnggCyclopedia's Liquid Viscosity Calculator. If there is a pump upstream of the heat exchanger, there probably will be no concern about pressure drop as Tubeside flowrate = 50000 kg/hr the F factor. Tubeside pressure drop (ΔP) = 6.17 × 3.5 / 1000 = 0.0216 bar. V = fluid velocity in tubes (m/s) Pa.s (kg/m/s). Increasing the nozzle size. Kindly submit ALL of your detailed spreadsheet calculations. A number of other criteria are also specified, such as minimum page : Then the frictional head loss and the frictional pressure drop are calculated using the Darcy Weisbach equation. the return cover and the pressure drop through the tubes. To transform the friction factor to a pressure drop, we need a count of Price However, it increases the cost due to increase in number of shells, tube sheets, channels/ bonets, nozzles, flanges, etc. How to lower Pressure Drop on the Tube Side of Shell and Tube Heat Exchangers, Page 1:

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