The Server Cabinet Should Pay Attention To Heat Dissipation

The server cabinet should pay attention to heat dissipation

Over the years, due to increasing the density of servers and reducing their size, the density of network cabinets and servers has become higher and higher. In addition, with the wide application of virtualization, cloud computing and other application technologies, data centers are increasingly generating more Therefore, the wattage of heat generated per square foot is rising. This increase in power density seriously threatens the stable operation of the data center. According to relevant research reports, the heat density exceeds 5kW per cabinet, and the highest cooling efficiency is used The air supply under the floor of the air conditioner in the computer room will also generate local hot spots on the top of the cabinet, which will easily lead to overheating protection of the equipment.

With the popularity of high-performance computers, increased utilization of network cabinets and data center equipment, and a large number of applications of blade servers, in view of high power density and heat generation density, the power supply and heat dissipation problems in the cabinet have become the key to the development of data centers. In order to solve the data center The problem of heat dissipation and cooling of high-heat-density equipment currently generally includes high-heat-density area solutions, local hot-spot solutions, and dedicated high-heat-density cabinets.

The solution to the high heat density area is to centrally arrange the high heat density equipment in the computer room to form a high heat density area, and use the corresponding high heat density cooling method in this area. For example: close the relevant cabinets to isolate the cold and hot airflow to prevent cold and heat The airflow is mixed to reduce the cooling efficiency. The usual practice is to close the cold air channel space of the cabinet.

The solution to local hotspots is to adopt enhanced refrigeration treatment based on the overall air conditioning of the computer room by the computer room air conditioner, aiming at the local hotspot areas where the high heat density equipment heats up and the air conditioning of the computer room air conditioning is not cooled, that is, in areas that are prone to local hot spots. , Place the corresponding refrigeration terminal to strengthen the refrigeration cycle in the local hot zone to ensure the normal heat dissipation and operation of the equipment in the cabinet.

The high heat density cabinet is a closed cabinet, and the air inside the cabinet circulates independently. The hot air discharged from the server by the fan in the cabinet is sent to the air-cooling water heat exchanger at the bottom of the cabinet to cool the air and return it to the front of the server to complete the cabinet. Air circulation realizes the heat dissipation of high heat density servers. Due to the short air circulation path in the network cabinet, the heat dissipation efficiency is high.

In addition to the overall solution of the computer room and the high-heat-density enclosed cabinet, there are other high-heat-density cooling methods, such as direct cooling of the chip, sending the refrigerant (such as refrigerant, refrigerant, carbon dioxide, etc.) to the heating chip, and directly absorbing the chip. For example, the AMC technology directly absorbs the heat emitted by the CPU chip through the cooling liquid, which can achieve a heat dissipation of 1000W/cm2 on the chip (traditional CPU air cooling can achieve a heat dissipation of 250W/cm2 on the chip).