Energy saving analysis of partial natural cooling mode in large data centers

The indirect cooling mode of cooling tower in large data centers is mainly divided into two modes of the series system and parallel system of plate heat exchangers and water chillers. This paper presents the principles and characteristics of partial natural cooling of the two system modes, analyses the factors affecting the conversion temperature of natural cooling working conditions, calculates the outdoor wet bulb temperature ranges of the two system modes in the annual operating conditions in a case model, and calculates the annual operation energy consumption of five cities in different climate zones using the two system modes. The results show that the parallel system mode is better than the series system mode in terms of energy saving in the case model. It is suggested that the large data center should choose a suitable natural cooling system mode according to the calculation to ensure energy saving operation throughout the year.