Application of Entransy Dissipation Number as Performance Parameter for Heat Exchanger
Journal Title: INTERNATIONAL JOURNAL OF ENGINEERING TRENDS AND TECHNOLOGY - Year 2014, Vol 12, Issue 6
Abstract
A new physical quantity, entransy has been identified as a basis for optimizing heat transfer processes in terms of the analogy between heat and electrical conduction. This quantity, which will be referred to as entransy, corresponds to the electric energy stored in a capacitor. The entransy is defined as one-half the product of heat capacity and temperature, the effect of entransy consumption rate on the irreversibility of heat transfer process, it can be found that entransy is a state variable, from which a new expression for the second law of thermodynamics is presented; Then by setting entransy consumption rate and power consumption rate as optimization objective and constraint condition for each other. In the heat exchanger, there mainly exist two kinds of irreversibility the first is heat conduction under finite temperature differences and the second is flow friction under finite pressure drops. Hence, rather working on any other aspect we can target to minimize the entransy dissipation number to increase the performance of a heat exchanger. This can be proved experimentally for water -water and oil-water heat exchangers.
Authors and Affiliations
Sushant Puranik , Govind Maheshwari
Keywords
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