Abstract
Redundancy is generally considered in the computer room air conditioners (CRACs) of the data center room. The position of the CRAC in the on state and the operating air volume have a great influence on the temperature distribution. The temperature distribution of the data center room will affect the failure rate of the servers and the energy consumption of the air-conditioning system. Taking a typical data center room as an example, this paper uses numerical simulation to study the influence of the on/off state and air volume of CRACs on the temperature distribution of the hot and cold aisles and energy consumption. The calculation results show that we should preferably turn off the staggered CRACs on the opposite side and close to the middle position under the partial load. When the IT load is unevenly distributed, it is irrational to use the setting method of even distribution of the air volume of each CRAC. The air volume of each CRAC should be appropriately adjusted based on the distribution characteristic of IT load to reduce the energy consumption.
Highlights
In recent years, with the development of internet and cloud computing, the number and scale of data center in many countries are expanding rapidly
Zhang [3] stated that a rational layout of the ventilation wall could greatly improve the distribution of airflow and the thermal environment of the data center room, so that the heat generated by the servers could be discharged outside in time, and the energy consumption of the airconditioning system could be reduced
Gao et al [4] stated that installing clapboard on the top of the rack on the cold aisle and partially enclosing the cold aisles to improve the airflow organization of the data center room could effectively reduce the mixing degree of hot and cold airflow, the waste of cooling, and the energy consumption of the air-conditioning system
Summary
With the development of internet and cloud computing, the number and scale of data center in many countries are expanding rapidly. The current research on reducing the energy consumption of the airconditioning system of data center mainly focuses on the refrigeration system and airflow organization, but the research on the operation mode of computer room air conditioner (CRAC) and the internal temperature distribution of the data center room is not in-depth. The temperature distributions of the hot and cold aisles affect the failure rate of the server and the energy consumption of the CRACs. Under the case of uneven temperature distribution, in order to avoid the phenomenon of excessively high temperature in local areas, the temperature in certain areas must be low. We compare and analyze the temperature difference and airflow difference under different cases to study the impact of the operating number and parameter settings of CRAC on the temperature distributions of the hot and cold aisles and find a relatively rational operation strategy to guide the practice and reduce the energy consumption of the air-conditioning system
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