Study On The Saving Energy Project In The Air-condition And Ventilation Of The Subway Environment Control System Using Frequency Conversion Fans

As a main public transportation means for its efficiency in improving the traffic condition, subway will be developed rapidly in the future two or three decades in our country. The control of subway environmental systems is becoming more and more important in the subway engineering, so how to optimize the design of subway environmental control system, save energy and decrease its operating cost is an important topic worthy of concern.The purpose of the study is to obtain an optimal energy-efficient mode of subway environment ventilation systems that can ensure subway systems operate in the normal condition and keep the thermal comfort of passengers.Based on enormous domestic and foreign researches on this subject, combined with the Rebuild Project of Tianjin Subway, this thesis lays emphasis on following aspects:Count the heat load of common district of subway, find the rule of some factors and the fluctuate of heat load. Then the amount of airflow time by time can be calculated.Combined with the original design of the 1# line of Tianjin Subway, provide two control modes: Real-time control and graded control by frequency conversion. Experimental study on the performance of axial fans is done in this thesis. The result shows that frequency conversion control on fans is economical.Make use of Gambit and Fluent, investigate the fan in the XiaoBaiLou station, simulate the temperature field and the velocity field of the fan, then receive the power and efficiency .Experimental study and simulations show that it is feasible to use the graded control by frequency conversion proposed in the thesis, it is economical,reliable and practicable.