Simulation and Optimization of Airflow Organization from Nozzle Side of Air Conditioning in UHV Flexible DC Valve Hall

Abstract

[Introduction] The ultra-high voltage flexible DC valve hall has the characteristics of high height, large volume, and large heat generation of equipment. The air supply mode of the air conditioning in the valve hall can significantly affect the indoor temperature field, wind speed field, and pressure field. It is very important to study the air supply mode of air conditioning in valve hall to ensure the normal operation of heating equipment in valve hall. [Method] Ansys Fluent 19.2, a CFD simulation software, was used to simulate the valve hall in the horizontal side air supply mode of the spherical nozzle, and the problems in the temperature field, wind speed field and pressure field were analyzed. And they were improved by changing the air supply angle. In this study, three kinds of air supply angles were set for simulation : i=10°, i=20°, i=30°. [Result] In the case of the horizontal side air supply mode of the spherical nozzle, the average temperature of the air in the valve hall is 30.30 ℃, and the average temperature, maximum temperature, and minimum temperature of the valve body surface are 52.91 ℃, 62.93 ℃, 43.55 ℃ respectively. There is local high temperature on the valve body surface. When i=30°, the lowest average indoor air temperature is 30.27 ℃, and there is less static air area around the valve body. The lower limit of the maximum surface temperature of the valve body at four air supply angles is 61.66 ℃; when i=10° and 20°, the average air temperature in the valve hall is respectively 30.40 ℃, 30.45 ℃, the highest temperature of the valve body surface at these two air supply angles exceeds 63 ℃. [Conclusion] The best inclination angle of the spherical nozzle air supply in summer in the UHV flexible DC valve hall is 30°.

Keywords

• uhv
• flexible dc valve hall
• spherical nozzle
• air supply angle
• cfd simulation