Research on Energy saving Technology of Circulating Cooling Water System in Central Air Conditioning System

Abstract In summer, hot and humid, high temperature time is long, the proportion of air conditioning energy consumption in hotel buildings is high, hotel building energy consumption is large, and energy saving potential is large in hot summer and cold winter zones. Simulation calculation of air conditioning and domestic hot water load characteristics of a hotel, and analysis of the relationship between hot water load and air conditioning condensation heat. This system uses a heat exchanger to heat the water inlet of the air-conditioning condensing hot water boiler to achieve waste heat utilization. The selection of heat exchangers and the volume of hot water storage tanks was studied, and the system was designed and calculated. The system was analyzed from energy saving and environmental characteristics. The results show that the waste heat recovery efficiency η 1 = 97.84%, the waste heat recovery energy saving rate η 2 = 32.6%, and the daily recoverable heat 2228.4 KWh. When the amount of water entering the tower and the environmental meteorological parameters remain unchanged, the evaporation loss of the cooling tower decreases significantly with the decrease of the temperature of the water entering the tower. The evaporation rate can be reduced by 0.172% when the inlet water temperature is reduced by 1°C. And it can reduce the gas boiler gas consumption, a refrigeration season can reduce 52462.4 kg CO 2 emissions. The research results have significant energy-saving and emission reduction effects, and can achieve considerable social and environmental benefits.