The core problem of compressor oper
What role does the air conditioning and refrigeration cabinet in the computer room play
What role does the computer room air-conditioning and refrigeration cabinet play? The hot aisle/cold aisle cabinet layout method is adopted by modern data centers and is also recognized as the best layout method for data centers. This layout method can effectively separate cold air from hot air, and use air conditioners and electric fans to lower the temperature of IT equipment. The structure of hot aisle and cold aisle is designed to save energy and reduce cooling costs by managing air flow.
The simplest data center hot aisle cold aisle plan is to arrange server racks in interspersed rows so that the cold air inlet faces one side and the hot air outlet faces the other side. The row formed by the front of the rack is called the cold aisle. Normally, the cold aisle faces the output duct of the air conditioner. The row of hot air output is called the hot aisle, and the hot aisle faces the return air duct of the air conditioner.
The height of the raised floor, the ventilation holes of the front door of the cabinet, and the placement of the cabinet will affect the heat dissipation capacity of the server in the cabinet.
The early server cabinets of computer room air conditioners had beautiful glass front doors, which prevented the server fans from effectively sucking in cold air. Now, if you want to install hot and cold aisles in the data center, it is necessary for the cabinet to have perforated doors, but there is no standard for the perforated area of the cabinet doors. Server manufacturer Hewlett-Packard has introduced a cabinet with a perforated area of 65%, and some manufacturers claim that its cabinet door has a perforated area of 80%.
Although current server cabinet manufacturers always focus on the importance of cabinet doors, the airflow in the cabinet also plays an important role in the heat dissipation of the server. For example, rack accessories must not hinder the inhalation of cold air and the discharge of hot air. . The blind plate in the cabinet is also very important. If the blind plate is not installed between the servers, the hot air passes through the gap between the hot air and mixes with the hot air, which will reduce the cooling power and waste the cold air.
Data centers using hot aisle/cold aisle layouts must pay special attention to the spacing between the rows of cabinets. Each channel of the computer room air conditioner must be adjusted to the best distance of z* to ensure efficient cooling and heat dissipation. In addition, 42U is the height of the cabinet used throughout the data center, and many manufacturers provide 48U products. To increase the height of the server cabinet, the installation space for cables, cabinet accessories and PDU must also be considered.
Although this simple cabinet layout method is used all over the world, it does not clarify that it is fully confident. An example has pointed out that in a 50KW/m2 high power density data center, this layout lacks the accuracy of cold and hot air control. Even if many blind panels are installed, hot bypass air still appears and is circulated. , Leading to the emergence of many hot spots.
As the power density of data centers is getting higher and higher, computer room air-conditioning only passes through the hot and cold aisles and can no longer satisfy the cooling demand of data centers. Therefore, the control of the airflow in the hot and cold aisles has begun to be accepted by users. At present, many manufacturers are developing more precise separation techniques for the use of cabinets to separate the hot and cold air to complete higher-density data center cooling.
