| With the continuous expansion of urban areas, and the rapid expansion of high-voltage transmission network deep into the city, when considering the substation outdoor layout, there will be more and more urban expropriation relocation compensation in construction and the large noise to the surrounding residents at runtime, so 110 k V substation and 220 k V substation in Guangzhou basic in the form of indoor substation; If indoor substation main transformer room is poorly ventilated, which can lead to equipment temperature is too high and can affect the service life of the transformer malfunction, even knock out power to a region, so it is very important to study on the main transformer room ventilation design.As the shortage of energy and environment issues is increasingly prominent, natural ventilation technology, which is a kind of energy-saving, clean and conform to the concept of sustainable development of energy utilization technology, is paid more attention. Due to the uncertainty of wind pressure, this paper, taking a 220 k V substation main transformer room in Guangzhou city as the research object, the fluent simulation as the main research methods, researches on its thermal pressure ventilation, to find the best use of natural ventilation strategies. The main work and results in this paper are as follows:(1). Taking field test for a 220 k V substation in Guangzhou and finding out some characteristics of the walls and equipment vertical temperature distribution of the main transformer room, temperature gradient over the height of equipment changed little, about 0.7 ℃; Below the height of equipment temperature gradient changed large, about 4.1 ℃; The inlet air temperature influenced the indoor temperature distribution. The lower inlet air temperature was, the more its capacity of natural ventilation was.(2). Using fluent software respectively simulated the simplified model of the radiator and realistic model of radiators at the same conditions. The result displayed that the maximum error between this two models is about 4%, which could be used for the following verification and optimizing simulation research. Then simulated indoor thermal environment of a simplified model of the main transformer room, and compared the thermal environment laws of simulation and field tests to verify the rationality of numerical simulation method.(3). Analyzing the climate adaptability of applying natural ventilation in Guangzhou’s buildings, and combining the analysis with fan-controlled plans and simulation result, which got a Concluding that the capacity of natural ventilation in Guangzhou is great. Conclusion from the simulation analysis of the influence factors of thermal pressure ventilation were as follows: When the inlet location changed, the thermal pressure ventilation effect is optimum when center height of the inlet is 2.4 m and inlet area including equipment area; When the inlet center height is stable, the ventilation rate increased as the inlet area increased, but the increase gradient is depressive, considering the noise and cost, the inlet area should increase by 40 %. The outlet location also influenced the thermal pressure ventilation, when outlet location was on the right of the roof, which was far away from the inlet, the thermal pressure ventilation effect would be best, with a result of the timely exhausting of the top hot-air. The ventilation rate greatly increased as the outlet area increased, and the effect was greater than changing the inlet area. It’s optimum to increase the outlet area by 200%. The ventilation rate also increased as the building’s height increase, and the average temperature of equipment surface and indoor would decrease, but the trend decreased. Considering the maximum allowable temperature of insulation temperature and the cost, the optimum height was 24 m, what made the thermal pressure ventilation effect greatest. |
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