TY - JOUR
TI - A new model to measure the performance of the fins based on exergy analysis
AU - Seyyedi Seyyed Masoud
AU - Rajaee-Zadeh Tahereh
AU - Hashemi-Tilehnoee Mehdi
JN - Thermal Science
PY - 2019
VL - 23
IS - 2
SP - 509
EP - 523
PT - Article
AB - Currently, two basic measures performance models are conventionally defined  to evaluate the performance of the extended surfaces or the fins. First is  the fin efficiency that is defined as the ratio of actual heat transferred by  a fin to heat that would be transferred if the entire fin were at base  temperature. Second is the fin effectiveness that is defined as the ratio of  heat flux from the wall with the fin to heat flux from the wall without the  fin. In the present work, a new criterion is proposed to measure the  performance of the fins. The new criterion is defined as the ratio of exergy  of convective heat transferred by the fin to the irreversibility of the fin.  The new criterion named fin ecological coefficient of performance (ECOPf)  based on the second law of thermodynamics whereas the fin efficiency and fin  effectiveness carried out by the first law of thermodynamics. A code has been  developed using these models to compare the performances of a typical fin  with respect to the fin parameters and cooling fluid. According to the  results, it can be concluded that the ECOPf model is a rational criterion  rather than two other models. In addition, since ECOPf model considers the  irreversibility of the control surface so it is a better measuring  performance model in new fin design.