| In recent years,the scale of national data centers is growing rapidly under the influence of multiple factors such as digital economy,east and west,double carbon,computing power and AI.However,the air conditioning and refrigeration systems that occupy most of the energy consumption in China’s data centers generally have problems such as unreasonable air distribution and serious waste of energy consumption.Reasonable air distribution is the key to the safe and stable operation of the computer room.This paper aims to study the optimization of airflow organization in data center and reduce the energy consumption of computer room.Taking the data center room of air conditioning air supply in a column room under construction in harbin as the research object,the following work is carried out:(1)Research on the overall airflow organization of the computer room.The computer room of a data center project under construction in harbin was established as the research object,and the model of the in-row air conditioning air supply mode was established by means of CFD numerical simulation,and the operating parameters of the computer room were brought into the model as boundary conditions,and the cabinet temperature,several typical cross-sectional temperature fields and speed fields of the machine room were selected for research and analysis.The results show that there are many local hot spots in the cabinet of the computer room,the overall ambient temperature does not meet the industry standard,there is a significant temperature difference in the vertical height of the computer room,and there are more hot and cold mixing phenomena in the channel of the computer room.(2)Research on local airflow organization in the computer room.By using CFD numerical simulation method,the temperature field and speed field of several typical sections of the computer room,the thermal environment evaluation indicators(heating index SHI,return air temperature index RTI,rack inlet and exhaust air average temperature difference indexβand cabinet airflow distribution energy utilization indexη_r)were used to analyze and study the airflow organization optimization process of the computer room,explore the reasons for the uneven indoor temperature distribution of the in-row air conditioning air supply,and obtain the influence of three factors of channel opening/closure,air conditioning layout and return air form on the thermal environment of the computer room.(3)Orthogonal test design method is used to analyze the influencing factors of heat dissipation effect in data center.Taking the channel opening/closing,air conditioning layout and side air conditioning pull-out rate as the test factors,The influencing factors of heat dissipation effect of data center are analyzed by orthogonal test design method.Finally the importance of factors affecting the airflow organization of the in-row air conditioning is obtained:channel opening/closure>air conditioning layout>side air conditioning pull-out rate.Considering the interaction between various factors,and according to the analysis results,this paper argues that the airflow organization is optimal under the working conditions of closed hot aisle,cross-placement of air conditioners,and pull-out rate of side-fed air conditioners of 27.5%in data centers using inter-column air conditioners.(4)Research on the failure of air conditioning in data centers.By establishing the transient heat exchange model,the transient working conditions of air conditioning cold source failure and air conditioning fan failure are simulated,and the results show that:(1)When the air conditioner fails,the average temperature rise of the hot aisle increases linearly with the time,and the temperature rise rate increases with the increase of the cabinet power at random intervals.(2)When the cold source of the air conditioner fails,when the power of the single cabinet is 5k W,the staff should complete the emergency measures within 10min,so priority is given to the cabinet close to the air conditioning side to strive for rescue time.(3)When the air conditioning fans fail,when the power of a single cabinet is 5k W,the staff should complete the emergency measures within 6min,at this time,the indoor air is mainly driven by the IT equipment itself fan to drive local flow,the heat emitted by the server continues to accumulate near the cabinet is difficult to spread,the server in the cabinet than the air conditioning cold source failure to reach the limit temperature is shorter,the average temperature rise rate is faster. |
