For more details about preliminary heat exchanger design, the parameters involved, and example heat exchanger calculations, see the articles: âPreliminary Heat Exchanger Design Exampleâ and âFundamentals of Heat Exchanger Theory and Design.â. Kakac, S. and Liu, H., Heat Exchangers: Selection, Rating and Thermal Design, CRC Press, 2002. A plate & frame heat exchanger has the following advantages over the widely used shell and tube heat exchangers: High value for overall heat transfer coefficient, for the same two fluids, a flat plate heat exchanger typically has a U value much higher than either a shell and tube heat exchanger or a spiral heat exchanger. How do you calculate the heat transfer area of a plate heat exchanger? This is a short tutorial about convective heat transfer version and a U.S. version are available for download just below. I just want to be able to understand how the number of plates are calculated. Katmar stated: "no engineer would try to calculate this by themselves - you just ask the plate exchanger supplier to do all the calcs for you and give you a price". The HTC will vary with the type of pattern pressed into the plate, and this information is kept secret by the manufacturers. Double Pipe Heat Exchanger - China Commodity Net. The heat load formula is given as, Heat load = Q = m × Cp ×ΔT. The heat transfer area can be calculated after values have been determined or estimated for the required heat transfer rate, Q; the overall heat transfer coefficient, U, and the log mean temperature difference for the heat exchanger, ÎTlm, based on the values of several input parameters. I'm going to think why is that difference if it is worth the effort. I made a calculation of the number of plates using the method shown in the ppt, based on the design conditions of a heat exchanger I bought, but I did not get the same number of plates offered by the vendor. The heat load of a heat exchanger can be derived from the following two formulas: 1. The tube or pipe diameters and length also need to be determined, as well as the pressure drop. The topic is shrouded in proprietary information that is not available. Check out the latest downloads available in the File Library. Heat sources which result in an internal heat like heat conduction through the glass, walls, etc. Can someone please explain how the number of plates are calculated. Heat load, Theta and LMTD calculation. Where: P = heat load (btu/h) m = mass flow rate (lb/h) c p = specific heat (btu/lb °F) δt = temperature difference between inlet and outlet on one side (°F) k = heat transfer coefficient (btu/ft 2 h °F) units, Click here to download this Excel spreadsheet template (pages 1 and 2, in U.S. units), Click here to download this Excel spreadsheet template (pages 1 and 2, in S.I. How do you calculate the heat transfer area of a plate heat exchanger? Thus the heat exchange area calculated on page 1 can be used for the page 2 calculations. Consider the whole post , in particular answers from Katmar ! Your email address will not be published. Related Topics . For a more complete explanation of heat transfer theory and calculations, download the following brochure: Contact us and we'll connect you with a plate heat exchanger engineer that can help you with your calculations. Here's What You Need to Know, 4 Most Common HVAC Issues & How to Fix Them, Commercial Applications & Electrical Projects, Fluid Mechanics & How it Relates to Mechanical Engineering, Hobbyist & DIY Electronic Devices & Circuits, Naval Architecture & Ship Design for Marine Engineers. The heat load of a heat exchanger can be derived from the following two formulas: 1. This example spreadsheet shows calculations in U.S. units, however an S.I. All the calculation methods I have come across involve specifying the number of plates (rating calculations) but I am more interested in designing for a specific plate configuration, say I have a plate and would like to use those to determine the size (number of plates) for the required heat duties. In design of STHE, you assume a value of U and perform iterations to see if the assumed value meets/exceeds HT … Heat exchanger design includes estimation of the heat transfer area needed for known or estimated heat transfer rate, overall heat transfer coefficient and log mean temperature difference. As Mr. katmar said for these heat exchanger design you have to consult with vendors. Where, Q = Heat load (kW) m = mass flow rate (kg/s) Cp = specific heat (kJ/kg K or kJ/kg o C) ΔT = change in temperature (K or 0 C) Example 1. Nonlinear Loads and Harmonics in Power Systems. The amount of heat to be transferred (heat load), The inlet and outlet temperatures on the primary and secondary sides, The maximum allowable pressure drop on the primary and secondary sides, The flowrate on the primary and secondary sides. In design of STHE, you assume a value of U and perform iterations to see if the assumed value meets/exceeds HT or pressure drop requirements. This spreadsheet. Bengtson, H., Fundamentals of Heat Exchangers, an online, continuing education course for PDH credit. The heat load of a heat exchanger can be derived from the following two formulas: 1. Required fields are marked *. Heat load, Theta and LMTD calculation. Are there any good books or references materials on PHE design that you can suggest please. Service for Gasketed Plate Heat Exchangers, The amount of heat to be transferred (heat load), The inlet and outlet temperatures on the primary and secondary sides, The maximum allowable pressure drop on the primary and secondary sides, The flowrate on the primary and secondary sides. For a more complete explanation of heat transfer theory and calculations, download the following brochure: Contact us and we'll connect you with a plate heat exchanger engineer that can help you with your calculations. units). I have given up on designing a PHE myself, it is best to just rely on Aspen EDR. The heat exchanger design equation, Q = U A ÎTlm, can be used to determine the required heat transfer area, A, for a heat exchanger. CBSE Previous Year Question Papers Class 10, CBSE Previous Year Question Papers Class 12, NCERT Solutions Class 11 Business Studies, NCERT Solutions Class 12 Business Studies, NCERT Solutions Class 12 Accountancy Part 1, NCERT Solutions Class 12 Accountancy Part 2, NCERT Solutions For Class 6 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions for Class 8 Social Science, NCERT Solutions For Class 9 Social Science, NCERT Solutions For Class 9 Maths Chapter 1, NCERT Solutions For Class 9 Maths Chapter 2, NCERT Solutions For Class 9 Maths Chapter 3, NCERT Solutions For Class 9 Maths Chapter 4, NCERT Solutions For Class 9 Maths Chapter 5, NCERT Solutions For Class 9 Maths Chapter 6, NCERT Solutions For Class 9 Maths Chapter 7, NCERT Solutions For Class 9 Maths Chapter 8, NCERT Solutions For Class 9 Maths Chapter 9, NCERT Solutions For Class 9 Maths Chapter 10, NCERT Solutions For Class 9 Maths Chapter 11, NCERT Solutions For Class 9 Maths Chapter 12, NCERT Solutions For Class 9 Maths Chapter 13, NCERT Solutions For Class 9 Maths Chapter 14, NCERT Solutions For Class 9 Maths Chapter 15, NCERT Solutions for Class 9 Science Chapter 1, NCERT Solutions for Class 9 Science Chapter 2, NCERT Solutions for Class 9 Science Chapter 3, NCERT Solutions for Class 9 Science Chapter 4, NCERT Solutions for Class 9 Science Chapter 5, NCERT Solutions for Class 9 Science Chapter 6, NCERT Solutions for Class 9 Science Chapter 7, NCERT Solutions for Class 9 Science Chapter 8, NCERT Solutions for Class 9 Science Chapter 9, NCERT Solutions for Class 9 Science Chapter 10, NCERT Solutions for Class 9 Science Chapter 12, NCERT Solutions for Class 9 Science Chapter 11, NCERT Solutions for Class 9 Science Chapter 13, NCERT Solutions for Class 9 Science Chapter 14, NCERT Solutions for Class 9 Science Chapter 15, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 10 Maths Chapter 1, NCERT Solutions for Class 10 Maths Chapter 2, NCERT Solutions for Class 10 Maths Chapter 3, NCERT Solutions for Class 10 Maths Chapter 4, NCERT Solutions for Class 10 Maths Chapter 5, NCERT Solutions for Class 10 Maths Chapter 6, NCERT Solutions for Class 10 Maths Chapter 7, NCERT Solutions for Class 10 Maths Chapter 8, NCERT Solutions for Class 10 Maths Chapter 9, NCERT Solutions for Class 10 Maths Chapter 10, NCERT Solutions for Class 10 Maths Chapter 11, NCERT Solutions for Class 10 Maths Chapter 12, NCERT Solutions for Class 10 Maths Chapter 13, NCERT Solutions for Class 10 Maths Chapter 14, NCERT Solutions for Class 10 Maths Chapter 15, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, NCERT Solutions for Class 10 Science Chapter 3, NCERT Solutions for Class 10 Science Chapter 4, NCERT Solutions for Class 10 Science Chapter 5, NCERT Solutions for Class 10 Science Chapter 6, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16.