Study On The Factors Influencing Heat Removing In Rooms For Digital Electronic Equipments With High Heat Emmision Rate

With the increases of server power consumption and heat emmision in the computer rooms of data center, a large number of micro-processors accommodated in equipment will not only create a huge burden on the infrastructure of the air-conditioning equipment, but also greatly influence server performance by the large amount of heat released from the racks. The rack cooling closely relate to air distribution of computer room air-conditioning units (i.e. CRAC) and the computer room layout. In the present study, the thermal environment in such rooms is considered as a background, and the indoor environment is analyzed by employing both mathematical model analyses and numerical simulations with the consideration of room layout and typical strategies of air supply.Based on the review and evaluation of the development, usage and existing problems of foreign data center room cooling technology, the advantages and disadvantages were summarized, by analyzing the computer room layout and air flow patterns indoors. The air distribution of data center is believed to play a key role in inlet temperature and humidity of electronic equipment. Therefore, the performances of raised floor air supply and top air supply were studied and discussed, respectively, the influences'of air supply and spacing between the CRAC racks and their inlet temperature, perforated floor airflow and room thermal environment were simulated and analyzed.The influence of CRAC unit spacing on room air and temperature distributions in CRAC with horizontal air supply and vertical air supply were analyzed by CFD simulation, respectively. 8 operating conditions (4 kinds of CRAC spacings and 2 kinds of air supply strategies) which are influence heat emmision and perforated floor air distribution of CRAC unit were compared. According to the analysis of heat cycle of each row of external racks and air distribution of each row of perforated floor, and the influence of top air supply on under floor board airflow and room internal environment, it was found that the environmental temperature would be relatively better in under floor air supply (d=3.66m) or roof air return, which provide a theoretical support for design planning and energy conservation of large-scale data center room.