Theoretical And Experimental Research On High Efficiency Screw Chiller Used In Subway Station

As an important part of urban public transport, how to reduce energy consumption of rail transit becomes a focused issue. Considered with the operating characteristic of air conditioning in subway station, solution method with large temperature difference and high outlet temperature of 10/17 Celsius in evaporator is put forward. Two condensers and evaporators are linked in series and both of them are in countercurrent form, in which condition the energy efficiency can be improved greatly. Simultaneously high efficiency chiller with two different capacities of compressor heads is designed to improve the energy efficiency in part load. Experimental research of high efficiency chiller is conducted and the results show that: With the decrease of load percentage, COP (coefficient of performance) is fluctuated from 6.2 to 7.0. With the increase of outlet chilled water, COP increases greatly; while with the increase of outlet cooling water, COP decreases greatly. In this system at the design condition, COP can reach as high as 7.01, which can supply database for utilization of chiller in subway station air conditioning system.