Entransy dissipation analysis of heat exchangers under heat leakages and varying heat capacity ratios

摘要

The analytical work presented here aims to evaluate the entransy dissipation number in presence of heat leak with an assumption that the minimum heat capacity is on the cold fluid side. The effect of heat capacity ratio and the heat leak on the entransy dissipation number has been illustrated. Entransy dissipation number has been found out for both parallel flow heat exchanger and counter flow heat exchanger with varying Number of Transfer Units (NTU).The results portray the falloff trend of entransy dissipation with NTU for parallel flow as well as counter flow heat exchanger. A brief comparison of parallel and counter flow heat exchanger has also been depicted with a better outcome for counter flow heat exchanger.In the absence of heat leak, the mathematical model so developed for entransy dissipation number, resembles the result as presented by another researcher.