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Calculate the required heat transfer area based on values needed. They will also calculate the number of tubes needed for a shell and tube heat exchanger and to calculate the pipe length needed for a double pipe heat exchanger.
10 Αυγ 2011 · The heat transfer rate, Q, can be calculated in a preliminary heat exchanger design spreadsheet if the flow rate, heat capacity and temperature change are known for either the hot fluid or the cold fluid. Then one unknown parameter can be calculated for the other fluid.
This paper demonstrates how Excel can be used in solving heat exchanger problems. Formulas are provided for replacing charts in solving heat exchanger problems. Several examples are included to demonstrate the application of Excel in heat exchanger analysis and design.
The heat transmission area of a plate is represented on the drawing below as the blue area. The geometrical area (Lw * Lp) is the projected area. Figure 3 : heat transmission area of a plate
Example demonstrating how to model, and optimize the surface temperature of a heat conducting slab in Excel using ExceLab calculus functions.
Mass flow rate = 1.5 l/s (24 gpm) x 1 kg/l = 1.5 kg/s (3.30 lb/s). The manufacturer uses a Heat Transfer Coefficient 'U' for the heat exchanger of 2500 W/m2°C (440 Btu/h.ft2.°F). Take the Specific Heat of water (cp) as 4.19 kJ/kg°C = 4190 J/ kg°C (1.0 Btu/lb.°F).
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. The tube or pipe diameters and length also need to be determined, as well as the pressure drop.
