Energy efficiency ratio analysis of high efficiency chiller water system for underground railway

According to the operating characteristics of underground railway stations, comprehensively considers the energy consumption of chiller, pump and cooling tower for a refrigerating equipment room, proposes a 10 ℃/17 ℃ large temperature difference and high outlet water temperature solution, and adopts a high efficieny chiller with series countercurrent and unequal double compressor heads. Under the same condition, the average evaporator temperature can increase 1.4 ℃ and the average condensation temperature can decrease 1.5 ℃, and the coefficient of performance can increase greatly. The chilled water pump, cooling water pump and cooling tower are optimized by frequency conversion, and under the condition of cooling water temperature of 30.5 ℃/35.5 ℃, the energy efficiency ratio can reach 5.5 with the load rate from 13% to 100%, which has great energy saving effect.