Simulation of Transient Flow in a Cold-Water Supply System with Pressure Reducing Valves for Cooling the Inside of a Coal Mining Pit

감압밸브를 사용한 탄광갱내 공조용 냉수 공급시스템의 과도현상 해석

Transient flow in a cold-water supply system for cooling the inside of a coal mining pit was numerically simulated. Properly designed and presetted pressure reducing valves control the level of pressures of the piping system at normal or emergent conditions Quasi-steady relations to simulate the valve motion are obtained and the transient performance of the valve is investigated in the present paper. The present method reasonably simulate transient phenomena in the system including the pressure reducing valve. Excessive valve motion and column separation are simulated when the flow is abruptly reduced. A calculated example of the real system is also presented. The simulation can be used for the safety-check and the guidance for design and operation in emergent cases of the system.