Numerical simulation of thermal environment of precast chamber for smart substation in alpine region

ZHU Dechun1,2, WU Ming1,2, HAN Debin1,2

(1.NARI Group corporation（State Grid Electric Power Research Institute）, Nanjing 211106, China;
2.NARI Technology Co.,Ltd. , Nanjing 211106, China)

Abstract: In order to solve the problem of thermal design for precast chamber of secondary equipment in substations in alpine region, the calculation model of equivalent heat transfer coefficient and the simulation method of CFD was applied to the thermal environment calculation. The insulation structure and thermal control measures of precast chamber were designed. The heat dissipation of precast chamber under the condition of low temperature starting and low temperature keeping were calculated, while the internal flow field and temperature field of the precast chamber were simulated based on the energy and momentum equation and the CFD technology. The simulation results show that for the precast chamber with cabinet doubly arranged and air supply from both ends by industrial air conditioning of wallhung, the heat flow moves upward quickly and then goes back to the air return opening of the airconditioning along the top after encountering in the middle of the precast chamber under the low temperature heating of -52 ℃, the circulation flow of air in the precast chamber can be realized under the low temperature condition, which keep the inner temperature of the precast chamber within the design range by regulating the heating temperature of the airconditioning. The theoretical calculation model is easy to carry out, and the simulation method is efficient and practical.

Key words: alpine region; smart substation; precast chamber; thermal environment; numerical simulation