Abstract
The generation of entropy leads to destruction in performance of the thermodynamic element. The present paper investigates the entropy generated in a heat exchanger under different operating conditions and varying scale thickness. The results show that with increase in scale thickness entropy generation increases. The entropy generated is maximum when the effect of temperature is considered and corresponds to 9.9J/K for a scale thickness of 1mm. Entropy of 6.6J/K and 7.8J/K is generated respectively for Nusselt number 7.5 and Stanton number 4 when scale thickness is 1mm. The effectiveness of heat exchanger decreases by approximately 2% for an increase of 1mm scale thickness. If the scale thickness is neglected then the entropy generated is observed to be 4J/K, 2.1J/K, and 2.6J/K respectively for the same operating conditions.
