Simulation Of The Artificial Environment Of A Large Turbine Room And Ventilation Adjustment Programs

Nowadays, the energy runs short in our country. Energy saving in building has become a hotspot in research, and should also be considered during the building designing. Thermal power plant has the characteristics of high heat flux and ventilation flux, high temperature and large space, especially in the turbine machine room because there are many thermal equipments, heat exchangers and heating pipes in it. The selection of the turbine machine room ventilation project is crucial as it may lead to some local high temperatures that are inconvenient for operation if the ventilation is not very good, and even might cause malfunction of some machines and impact the security of the electrical power plant. The ventilation designing depends mostly on experience before and it is very difficult to considering energy saving. Thus the research of the ventilation system of power plant by CFD techniques is proposed in this paper. By simulating artificial environment in the turbine machine room by Fluent, the effective and reasonable ventilation system was obtained.Thermal equipment in the three floors of the turbine machine room was predigested reasonably in order to form calculable models. Grids and boundary conditions set up by AutoCAD, FLUENT and Gambit software. Complicated partial difference equations have been transferred into algebra equation by domain discretization. The calculation methods were selected to simulate the big turbine machine room. The parallel computation was used to improve computional efficiency and saving time. The temperature and velocity performance during different seasons, the comparison of the natural ventilation with the mechanical ventilation, and the influence of opening window on natural ventilation, the effect of the fan power on the artificial environment, the effects of operating conditions such as environment temperature, wind velocity on the indoor special points are studied in this paper.It is proved that it is feasible to simulate ventilation and heat transfer systems of huge turbine room by Fluent and the physical and mathematical model made are acceptable as the experimental data are identical with the simulation results. The opening extent of the fan has an inverse proportion with indoor temperature. The temperature change of special point is effected obviously by outdoor temperature and wind velocity. Operating mode and the opening of the fans are important factors to adjust the indoor temperature. The temperature of special points reduce with the increase of opening extend of fans and natural wind velocity. Operating mode has little influence on the temperature of special points. The results obtained in this paper have important values to the investigation and designing of the air conditioning system in the huge turbine machine room of the thermal power plant.