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With knowledge of the Nusselt number, the local heat transfer coefficient for each divided calculation section can be calculated by the relationship of the heat transfer coefficient and Nusselt number. ho Nu k Equation 9‐12 dh Finally, the temperature of the working fluid after passing one loop of the heat exchanger tubes can be obtained by the energy balance as shown below: ho tinfinite ts Ao mo Cpo to Equation 9‐13 where, Ao is the heat exchanger outside surface area, T s is the heat exchanger surface temperature and T infinite is a variable in the program. m o denotes the mass flow of the heat exchanger outside working fluid and h o denotes the local heat transfer coefficient for each specific section of the heat exchanger outside working fluid. The heat exchanger outside fluid pressure drop will decide the fan power, which is also very important for heat exchanger design. The pressure drop is calculated by Equation 9‐14. P f L u2 Equation 9‐14 dh 2 where f is the friction coefficient, L is the pipe length, d h is the pipe hydraulic diameter and u is the flow velocity. The density ρ is calculated at the fluid mean temperature. Several friction coefficients have been suggested by different researchers for different geometries and for different flow conditions. For laminar flow in slots with small distance in 107PDF Image | Thermodynamic Cycles using Carbon Dioxide
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