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Effectiveness and Second-Law Efficiency of a Serpentine Heat Exchanger
|關鍵字:||serpentine heat exchanger|
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This work adopted a one-dimensional model to analyze the performance of a serpentine heat exchanger which is composed of rectangular tubes. The fluid outside the tube is considered to be unmixed and it flows between two neighboring parallel tubes. The fluid inside the tube is considered to be mixed and it flows in a serpentine manner from the inlet to the exit. The effectiveness of the heat exchanger (ε) is presented as a function of ratio of heat capacitance rates (Ct*), overall number of transfer units (Ntuo) and number of tubes. For a fixed Ct* value, the initially increases with the Ntuo value. As the Ntuo value is large, it would slightly decrease with an increase of the Ntuo value. The second-law efficiency was also evaluated to search for optimum operating conditions. As the exit temperature of the tube-side fluid is higher and the exit temperature of the shell-side fluid is lower, the heat exchanger has a higher second-law efficiency value. For a fixed Ntuo value, the optimum Ct* value was found to be around 1.0. This work also analyzed the overall performance of two serpentine heat exchangers connected in series and in counterflow arrangement. As compared with a single serpentine heat exchanger, both the ε and the second-law efficiency can be largely upgraded.
|Appears in Collections:||機械工程學系所|
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