The Mean Temperature Difference Method for Micro Heat Exchanger Analysis Considering Property Variation
8 Pages Posted: 12 Feb 2018
Date Written: December 21, 2017
The influence of reducing dimensions to microscale on the performance parameter of parallel flow tubular micro heat exchanger is numerically analysed considering the thermophysical property variation effect. In the micro heat exchanger, conventional method fails to give accurate performance analysis due to significant property variation. So, a new temperature difference, i.e. Mean temperature difference correlation considering the property variation effect is derived. Operating conditions and geometric parameters are varied, keeping the inlet temperature of the both fluids and inlet velocity of the cold fluid fixed. The performance parameter such as effectiveness is evaluated. The reliability of the new mean temperature difference method is checked by calculating the percentage deviation between mean temperature difference and log mean temperature difference value for macroscale to microscale heat transfer. The results show that percentage deviation is maximum at microscale.
Keywords: Tubular Micro Heat Exchanger, Mean Temperature Difference, Log Mean Temperature Difference
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