eng Science and Education Publishing American Journal of Mechanical Engineering 2328-4110 2023-09-08 11 3 107 114 10.12691/ajme-11-3-2 AJME20231132 article Wenbo Liu 1040226416@qq.com 1 Tianyun Liu 2 Yutong He 3 School of Mechanical and Electrical Engineering, Guangdong Eco-engineering Polytechnic, Guangzhou 510520, China Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China In order to study the refrigeration characteristics of the refrigerated cabinet, a refrigeration characteristic analysis program based on the SIMPLE algorithm was developed using Fortran. The working condition was simulated and verified. The results show that the simulation results of the refrigeration characteristic analysis program developed with Fortran are basically consistent with the results carried out by commercial CFD Fluent software. In the early stage of the refrigeration process, due to the low temperature of the evaporator coil, the air near the evaporator coil was cooled first, and the density increased, resulting in a downward flow. Driven by natural convection, the air temperature inside the refrigerated cabinet gradually decreased, and at the same time, a large-scale vortex was generated in the cavity of the lower part of the refrigerated cabinet. As time progressed, the air in the cabinet was cooled to a certain extent, the air temperature difference in different regions decreased, the temperature gradient in the cabinet decreased, and the intensity of natural convection decreased. Finally, the temperature dropped to 278.15K and remained unchanged. http://pubs.sciepub.com/ajme/11/3/2/ajme-11-3-2.pdf refrigeration characteristics refrigerated cabinet SIMPLE algorithm numerical simulation Fortran program Fluent software