First, the status quo investigation
There are seven main reasons for the local hotspots in the data center:
1. The air supply volume of the perforated floor corresponding to a single cabinet does not match the air volume required by the IT equipment in the cabinet, causing the temperature inside the cabinet to rise.
2. The free U-space gap in the cabinet causes the temperature inside the cabinet to rise.
3. The gap between adjacent cabinets in the same row causes the temperature inside the cabinet to rise.
4. The space between the bottom of the cabinet and the electrostatic floor causes the temperature inside the cabinet to rise.
5. Improper matching of the heat load and the input cooling capacity causes the temperature inside the cabinet to rise.
6. The matching of the cabinet hole density with the air volume of the device causes the temperature inside the cabinet to rise.
7. With the extension of the usage time of the data center equipment, the hot air generated by some old equipment heating equipment in the cabinet cannot be efficiently discharged, resulting in eddy currents in the cabinet, resulting in high pressure inside the cabinet and high temperature, resulting in local high heat. However, the phenomenon of local hotspots may cause the operating environment of the equipment in the cabinet to be bad, and equipment damage may occur, thereby causing economic losses.
Second, feasibility analysis
In the equipment room, we select the air outlet orientation of the equipment as the average temperature observation object of the cabinet. The measured cabinet temperature is 43.8 degrees: the industry standard is: 35 degrees + 5 degrees or 35 degrees - 5 degrees.
The cabinet temperature reached 43.8 degrees, exceeding the standard temperature of 3.8 degrees.
Now for this phenomenon, we have studied the feasibility of lowering the cabinet temperature:
Open floor manual damper - feasible (expected improvement of 2 degrees)
Blind plate - feasible (expected improvement of 2 degrees)
Screened - feasible (expected improvement of 2 degrees)
Plus enclosure - feasible (expected improvement of 2 degrees)
Cooling capacity - feasible (expected to transform 4 degrees)
Opening the door - feasible (expected improvement of 2 degrees)
Blower - feasible (expected improvement of 4 degrees)
Third, the solution
Most of the traditional local hotspot solutions increase the cooling capacity of the entire room, so that not only the energy consumption is increased, but also local hot spots may appear from time to time. In addition, there is an active cooling method that adds point-to-point, that is, rack-type precision air-conditioning, but this method has a large investment, a long deployment period, and is difficult to deploy. Based on years of experience, as well as relevant standards and best practices at home and abroad, the solutions for local hotspots mainly include the following seven aspects.
1. The guide air ventilator and the manual damper are used to guide the cold airflow, so that 90% of the cold air is directly blown to the equipment, and the installation is convenient and simple, and does not affect the normal operation of the equipment.
2. Blocking the idle U position without equipment to prevent airflow disorder;
3. Block the gap between adjacent cabinets in the same column
4. Block the space between the bottom of the cabinet and the static floor to prevent the hot air from flowing back.
5. The degree of matching between thermal load and input cooling capacity is based on the law of conservation of energy. The actual cooling capacity of the air conditioner and the regional heat should be conserved. The safety angle should be equipped with a certain cooling margin, and the heat dissipation failure of a single air conditioner does not affect the area. The internal equipment is in normal operation.
6. The degree of matching between air supply and equipment demand should be microscopically ensured that the cabinet does not cause local overheating due to insufficient air volume. Macroscopically, the total regional air supply should be controlled between 90% and 110% of the total demand. And matching and adjusting the perforated floor opening rate, measuring the air volume, according to the demand of the equipment.
7. Increase the flow rate and flow rate of the wind by adding a heat sink unit;
Through the improvement and improvement of the local environment, the local hotspot phenomenon in the data center has been significantly reduced, but the local hotspot phenomenon still exists due to poor self-discharge, and further exploration is needed.
Fourth, the test of customized fans
Cooperate with the manufacturer to develop a customized version of the cooling fan to increase the flow rate and flow rate of the inlet and outlet winds of the cabinet, solve the local overheating problem inside the cabinet, and balance the hot and cold airflow in the equipment room. By adding a cooling fan, increase the flow rate and flow of the wind to solve the local overheating problem inside the cabinet.
Specific test
The data center is dust-free machine room, the environment is ideal, no dust, oil mist, water vapor, etc. affect the normal operation of the components in the cabinet. This test uses the air inlet to install the fan, and the air outlet to install the fan to test separately.
The selection of the cooling fan of the chassis cabinet is selected according to the difference between the temperature inside the cabinet and the ambient temperature and the heat loss in the cabinet. The test fan equipment is DC 48V/1.5A and AC 1.5W.
Cold air channel temperature cabinet temperature
AC fan DC fan is not installed fan equipment temperature 17.1 degrees Celsius 43.8 degrees Celsius air inlet installation 17.1 degrees Celsius 42 degrees Celsius outlet installation 17.1 degrees Celsius 41 degrees Celsius 32.9 degrees Celsius
in conclusion
The temperature of the DC fan cabinet installed at the air outlet is reduced to 10.9 degrees Celsius.
Five, the effect of comparison
Comparison of thermal imaging of the cabinet before and after installation of the fan:
In order to further reduce and eliminate the local hotspots in the data center computer room and improve the computer room management, we have taken the following measures: 1. The existence of local hotspots in all cabinets of the statistical data center. 2. Install a cooling fan for the defective exhaust air in the local hotspot cabinet. 3. Develop an observation plan and check the status of the cabinet regularly.
to sum up
Eliminating and reducing local hotspots in the data center not only ensures the safe and stable operation of the equipment, but also builds a healthy and green data center. Regardless of which solution is adopted, it is necessary to analyze the actual situation of the data center in combination with the implementation of these solutions to solve the local high heat, and provide a strong guarantee for building a safe, stable, efficient and energy-saving data center.
90degree Hybrid Coupler, up to 40GHz, connector SMA,N,2 92mm are avaliable. Customized frequency and optimized specifications available,contact us with your requirement.
Rf Hybrid Coupler,90 Hybrid Coupler,90 Degree Hybrid Coupler,20Db Directional Coupler
Chengdu Zysen Technology Co., Ltd. , https://www.zysenmw.com