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What does a rack look like in a computer room environment on a hot summer day?

2019-11-13 16:23:59

  With the construction of a new generation of data centers, the network, servers, storage and other basic equipment are further concentrated. This puts forward new requirements for the basic environment of the data center. In summer, the temperature of the equipment room and the cabinet will also rise. It can be said that it directly affects the normal operation of the chassis cabinet. If it is not handled properly, the chassis cabinet may be paralyzed, unable to run, and affect work. In order to ensure the normal operation of the network server equipment, certain cooling methods are required. Traditionally, the fans in the cabinet are used to dissipate heat to achieve the cooling effect. Most of the cabinets use compressed air for cooling.

   The original principle of the principle is that the compressed air flows into the cold and hot airflow after passing through the scroll tube. The hot airflow is exhausted at a slightly higher pressure through the scroll tube exhaust device, and the cool airflow is introduced into the chassis through the shunt to generate heat To reduce and stabilize the temperature inside the network cabinet without outside air entering the chassis. With a low-cost and reliable scroll tube cooler as the core component, the panel cabinet cooler can reduce the temperature of compressed air by 45 degrees. The cool air flows into the screen cabinet through the shunt to form a positive pressure in the cabinet together, so that outside air cannot enter, and the network cabinet is effectively cooled and purified.

   The object of the cabinet air conditioner is electrical, electronic or mechanical components, not people, so its set temperature can be set very high, between 30 ℃ ~ 45 ℃, generally the default temperature is 35 ℃, and the electrical components are There is no need for wind speed and noise. In fact, the large air circulation in the cabinet can alleviate some heat island phenomena of the electrical components and help the heat dissipation of the electrical components. Except for outdoor cabinets, most of the other cabinets are installed indoors, and some production environments are relatively chaotic. There are severe conditions such as high temperature, high humidity, high dust, and even oil or corrosive gas. In particular, the phenomenon of high temperature and high dust is relatively widespread.

   The cooling effect of the computer room is closely related to the selection of the cabinet and the placement of the cabinet

   The relevant cabinet is easily overlooked. At present, liquid-cooled (or water-cooled) cabinets are the most discussed topic. A more accurate description is cabinets with liquid-cooled doors. High-density server deployment is inevitable for data center construction and development, and the heat dissipation problem caused by it should deserve high attention. A small cabinet contains a huge mystery. The new generation of data centers is a hot topic today, whether it is resource integration, virtualization; or green energy conservation, automation, and security management, all are talked about in the industry.

   Existing data center racks or cabinets have a power configuration of 10A (ampere), and can deploy 15 to 16 1U rack servers at full load. For the worse data center, its power supply is only 6.8A, for blade servers. A fully equipped blade server requires approximately 10A of power.

According to the data center's existing capacity calculations, 10A power equipment obviously cannot meet the needs of more blade server deployments, and the contradiction of insufficient power is very prominent. How to solve the problem of insufficient power supply, the easiest thing to think of is to start with capacity expansion. In fact, at the beginning of the construction of a data center or building, there is a certain calculation of the power capacity. Nowadays, increasing power capacity requires the power sector to expand capacity, and involves the transformation of corresponding lines, switches and other equipment. There are many factors involved and many constraints.

   Reasonable adjustment of the existing power consumption situation is another solution to the lack of power. By adopting a set of program tools called Adaptive Data Availability Management (ADAM), some existing enterprises Data center monitoring, it was found that about 10% of the power consumption is used for lighting, etc., while the power consumption for IT equipment is only about 30%, and the remaining large amount of power is consumed in cooling, that is, operation The cost has greatly exceeded the actual cost of the equipment.

   Through reasonable layout and scientific thermal model design, the power consumption of operation and maintenance equipment can be greatly reduced, and the contradiction of insufficient power is effectively alleviated. Starting from the cabinet, the cost of air conditioning and cooling is high, which is in line with Design related.

   It is understood that the air-conditioning temperature in many computer rooms is very low. In summer, people need to wear thick clothes in the computer room. The reason is that the computer room sets the air-conditioning temperature according to the equipment with the highest cooling requirements. It will inevitably lead to a reduction in energy efficiency.

   The cabinets are easy to ignore. The administrator of a power equipment room stated that the company's IT budget is limited, and it is difficult to persuade corporate leaders to pay more than 10,000 yuan to buy cabinets. In the eyes of some leaders, the cabinets in the machine room and the furniture in home life There is not much difference. It can be saved. In order to pursue aesthetic style, many cabinets use glass doors, which results in poor heat dissipation of machinery and equipment and frequent failures.

Chassis cabinet appearance and heat treatment

   Generally, after the cabinet is formed, we need to dispose of its appearance. As long as its appearance is handled properly, its lifetime can be added and its function improved.

Spraying and electroplating are the most commonly used methods for the appearance of cabinets and cabinets. Its role is to prevent rust and static electricity, and together form a protective film. It is not the appearance of the cabinet cabinet that should be sprayed and plated. Generally, the interior of high-quality cabinets is less painted and electroplated. The cabinets with poor selling materials are generally spray-baked and electroplated. The intention of this is to whitewash the inferior quality of the selection information, and it is possible to add boards Material thickness.

   Not only the appearance of the cabinet, but also the outstanding heat dissipation is very important for the cabinet. However, the heat dissipation of the cabinet can not be separated from the electric fan. Think about the installation of the electric fan according to the size of the heat generated by the device. Generally, there are two to four electric fans on the top of the cabinet. The side fans should be installed on the rear wall of the cabinet. Why do you want to do this? The reason is that a lot of heat will occur at the rear of the device. The side wall electric fan is installed on the rear wall of the cabinet.

How much does the chassis fan play in the cooling process?

   With the development of chassis cabinets, the use of chassis cabinets has continued to increase. With the development of various enterprises, more and more equipment have been continuously added. The use of chassis cabinets has become very widespread. The use of chassis and cabinets is also increasing, but in the process of adding, it has brought great problems to the heat dissipation in the computer room, and the heat dissipation has also become a headache for users of multiple chassis cabinets.

   In fact, the use of multiple fans in the chassis and cabinets cannot solve the actual problem at all. 'If you want to play a role in heat dissipation, you must take away the heat generated by the equipment in the computer room. Cooling power, using the equipment room fan to blow the equipment, indicating that the heat of the equipment product Auntie Zhu can not be taken out of the equipment room, for this reason, the temperature in the equipment room will only increase continuously.

   So, is the computer room fan ineffective in cooling the computer room? It is not necessarily true. If the cabinet fan is matched with other heat dissipation equipment, such as airflow auxiliary equipment, it can achieve the effect of dispersing heat sources on local hot spots when the overall cooling capacity of the computer room is sufficient. It is especially suitable for down-blown air-conditioning systems. The upper part of the front of the cabinet is the hottest. After passing the fan and the airflow auxiliary equipment, it can quickly reduce the temperature above the front of the cabinet.

Working principle of chassis cabinet using air conditioner for cooling

   The heat dissipation of the chassis cabinet is an important issue in different seasons. In order to solve this problem, chassis cabinet manufacturers have installed air conditioners in the chassis cabinet to achieve the cooling effect, and at the same time, it can avoid some bad factors such as oil pollution, dust, high temperature brought by the fan . Its working principle is to achieve heat absorption and temperature reduction through compression refrigeration, thereby transferring the heat and moisture in the air inside the cabinet to the outside of the cabinet in a closed environment. The cabinet body is always kept in the ideal temperature environment of 30-35 ℃. So that the inside of the cabinet can work normally.

Only a good heat dissipation function can ensure a longer service life of the chassis cabinet.

   Selection of chassis cooling fans

   1. Natural ventilation type: The air outside the cabinet is convective with the air inside the equipment compartment of the cabinet, and natural air is used to exchange heat inside the cabinet.

   2. Ventilation: The structure of convection between the outside air of the shell and the air inside the equipment cabinet of the cabinet.

   3. Non-ventilated: The structure in which the outside air of the casing and the air in the equipment cabinet of the cabinet do not convect.

   4. Insulation type: The cabinet cabinet case is a cabinet with a multilayer structure containing a low thermal sandwich material.

   5. Air-conditioning type: The structure in which the air outside the cabinet does not convect with the air in the equipment compartment of the cabinet, and the temperature inside the machine is controlled by an air conditioner.

   6. Heat exchange type: The structure that the air outside the cabinet does not convect with the air inside the equipment compartment of the cabinet, and the temperature inside the machine is controlled and adjusted by a heat exchanger.

   7. Fan type: The structure in which the air outside the cabinet is convected with the air inside the equipment compartment of the cabinet. The fan is used to force the convection to perform heat exchange.

   As to which type is suitable for the chassis cabinet, for different types of internal structure of the chassis cabinet, the corresponding cooling fan is also different.

   1. The fan (filter fan) is especially suitable for economically discharging high heat loads. The use of a fan (filter fan) is only effective when the temperature inside the cabinet is higher than the ambient temperature. Because hot air is lighter than cold air, the air flow in the cabinet should be from bottom to top. Therefore, under normal circumstances, the front door or side panel of the cabinet should be used as the air inlet and the top as the exhaust.


   2. If the environment at the work site is ideal, and there is no dust, oil mist, water vapor, etc. that affects the normal operation of the components in the cabinet, an air inlet fan (axial flow fan) can be used. A decorative panel. For safety and beauty, an air blower decorative panel can be installed on the outside. If the environment at the job site is not ideal, it contains dust, oil mist,

   3. Water vapor and other components that affect the normal operation of the components in the electrical control cabinet, then you should choose a filter fan at the air inlet and a filter grille at the exhaust outlet to prevent dust, oil mist, and water vapor from entering the electrical control cabinet . At present, many manufacturers at home and abroad have mature product supplies, the installation is simple and convenient, and the filter pads can be easily replaced. Filter mats are generally divided into non-woven fiber filter mats and fine filter mats, of which non-woven fiber filter mats are used to prevent dust particles above 10 microns, and fine filter mats are used to prevent dust particles below 10 microns.

   The selection of the chassis cooling fan can be selected from the fan characteristic curve table according to the difference between the temperature in the cabinet and the ambient temperature and the heat loss in the cabinet.

   How to achieve the best of both worlds

   Many people think that if the cabinet is waterproof, it must be tightly sealed. As long as it is fully sealed, there will be no problem. However, let's think about it. Can the cabinet be cooled if it is sealed? The answer is definitely not, so a good seal may not be the best choice for waterproofing. The cabinet must dissipate heat, so how to achieve the best of both heat and water resistance? Let ’s take a look together.

   The waterproofing of outdoor cabinets and cabinets is basically the same as the waterproof structure of buildings we know, but the windows that open and close have blinds that slope from the inside to the outside! This design can not only effectively solve the problem of heat dissipation of the equipment in the chassis, but also such equipment has a very good rainproof effect! There will also be some small holes at the bottom. This is to prevent water in the cabinet and cabinet from being damaged if water enters the cabinet and can be discharged in time.

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