Experimental Study and Energy-Saving Analysis on Cooling Effect with Large Temperature Difference and High Temperature of Chilled Water System in Data Center

From the perspective of the precision air-conditioning operating condition, the effects of different load powers, different water temperatures of supply-and-return and temperature difference on energy consumption of precision air-conditioning and COP of water chiller were debated in this paper. The experimental results show that when the cooling mode of large temperature difference and high temperature is adopted, a higher water supply temperature and a higher efficiency of the water chiller are obtained. Moreover, the return water temperature is also increased, and the utilization rate of natural cold source can be improved. In order to reduce the energy consumption of the water chiller and increase the COP of the water chiller, natural cold source with gradient utilization can be used, which increased the utilization time of natural cold source. In a word, not only the energy consumption of precision air-conditioning water system but the chiller can be reduced by means of large temperature difference and high temperature.