Abstract
Enhanced airflow by axial fans is widely applied for efficient convective heat transfer and thermal management. The authors previously proposed the use of additional axial fans to enhance the airflow in a cold room and obtained improved cooling performance as well as increasing irreversibility through experimental thermodynamic analysis. In this study, the proposed strategy is numerically investigated via a validated computational model to evaluate distribution characteristics of airflow, temperature and entropy generation. The trade-off between cooling performance and irreversibility was analyzed under different operating conditions of additional axial fans. Numerical results indicated more homogeneous airflow and temperature distribution with increasing entropy generation caused by additional axial fans between produce bins. Additional axial fans with an operating angular velocity of 55 rad•s−1 at five positions between produce bins resulted in 18 to 37% improvement of cooling performance and 47% higher irreversibility when compared to the case without additional axial fans. An improved trade-off between improved cooling performance and increasing irreversibility could be achieved with lowering the operating angular velocity and reduced number of additional axial fans.
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