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Thermodynamic optimization of Periodic Regenerative Heat Exchanger

By E. Natarajan and K. Pitch


Abstract—This paper describes the second law of thermodynamics analysis of a regenerative heat exchanger. The analysis is based on the fact that the dimensionless parameters, known as the reduced periods (∏) and reduced length (Λ), are the characteristic variables to describe the performance of a regenerative heat exchanger. The solid matrix in the heat exchanger passage is discretised using trapezoidal rule and the elemental matrix is taken as a thermodynamic system. The second law of thermodynamics is applied to the system and the entropy generation equation is obtained using the Non-dimensional numbers ∏ and Λin each element. The entropy generation due to both heat transfer and fluid friction is accounted in the present analysis. The optimum working parameters such as Reynolds number and reduced length are identified for the given working and geometrical parameters. Keywords—Entropy generation, Periodic flow heat exchanger, Reduced length, Reduced period, and Solid matrix. I

Year: 2011
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