Fujikura developed large data center cooling system pump
【2011-8-3】
Fujikura developed the cooling system uses the length of 7m, about 5cm in diameter, large pump heat pump. Enclosed within the alternative freon "R134A". According to the Japanese Fujikura company, set the pump vertically, the lower part of its data centers placed near a heat source, and make it out of the top outside of the building can be effective for data center cooling.
Fujikura has developed a heat pump will use large-scale outdoor cold air cooling system for data centers. According to the company, if it is Japan's Nagano Prefecture, and other mountain areas north or northeast, and the U.S. state of New York and other cold-winter areas to a certain extent, the system allows data center PUE (powerusageeffectiveness: energy efficiency) than The original cooling system reduced by about 7% to 1.66, in about two years to offset import costs.
Fujikura The new proposal is the use of heat pump cooling system inside the data center and outdoor air heat exchange system. Heat pump does not require electricity to work, but also has a passive heat transfer function. Pump enclosure called "working fluid" highly volatile and the latent heat of vaporization of the liquid. Erected vertically upper and lower temperature difference heat pump, the heat absorbed in the lower part of the post-gasification gas in the convection heat pump to move to the upper part of this release heat back into heat again after the liquid and the lower part way through this cycle the lower part of the heat transfer from the first heat pump units. Relatively small heat pump had a majority, but also for personal computers and servers internal cooling, cold regions of the roads to prevent snow and permafrost to melt and so on.
Use of data center cooling system heat pump overview
The use of long-7m, about 5cm in diameter, large heat pump
Fujikura The cooling system uses about the development of 7m, about 5cm in diameter, large pump heat pump. Enclosed within the alternative freon "R134A". According to the company, set up the pump vertically, the lower part of its data centers placed near a heat source, and make it out of the top outside of the building can be effective for data center cooling. Even if the outdoor temperature is higher than the interior in summer, the heat will not occur in the data center back and temperature. This is because the outdoor air is heated close to non-liquefied gas can remain in the state of the upper pump. Because of such features, the heat pump is also known as "thermal diode" or "thermosiphon" and so on.
Heat pump "thermal diode" function. During the summer does not start, so the heat will not return.
Fujikura made use of the system of two specific programs. One is the cooling system as the original play a supporting role in "pre-cooler (Precooler)", the other is to prepare for summer power outages, etc. as "emergency use of ice thermal storage system."
Pre-cooling heat pump uses the original purpose is to strengthen the data center cooling system cooling for reducing system load. Fujikura said, "for example, server power consumption of 8800kW of the data center 60 × 36 根 total of 2160 heat pump, in the New York winter, heat pumps can be used further to 25 ℃ cooling water lower the temperature 5 ℃. Winter season can be reduced by about 3 ℃, summer can reduce the 1.3 ℃ ".
As a result of this method can reduce the power consumption of the cooling system of about 3 percent, the annual operating costs can reduced by 59 million. According to the company, including land costs included, into the heat pump costs about $ 1.14 million. That is, within less than 2 years can be offset import costs.
Modern version of the icehouse response power
Another option is an emergency with ice thermal storage system can be used to pump a lot of ice in the winter ahead, and then in the summer power outages and other emergencies, with these ice-cooling. Fujikura's projections showed that, if it is in New York State, can make use of winter ice, so the power consumption of 8800kW continuous cooling of the server group for about 6 hours.
There every day before and other places in the building electricity use ice at night, during the day to use for air-conditioning system. Fujikura different parts of the system lies in its ice without electricity.
According to the Fujikura introduced with the original store in advance of an emergency with cold water cooling systems, the company's system, only the former tank volume 1 / 7, including the cost of land, including its import cost only 1 / 25, substantially achieve the miniaturization and reduce costs.
However, in the case of no electricity, ice, winter temperatures required number of days below 0 ℃ to persist for some time over cold regions can be achieved. Fujikura said, "into our system have an effect on condition that the average temperature in winter the number of days below 0 ℃, and the average temperature in this case derived by multiplying the absolute value (cumulative freezing index) 400 ℃ days or more. " For example, the average temperature of -10 ℃ number of days last 40 days, cumulative freezing index will reach 400 ℃ days.
Frozen regions of the cumulative index. Cumulative freezing index is defined as the average temperature below 0 ℃, the number of days and these days the average temperature derived by multiplying the absolute value. According to the Fujikura introduced, the conditions for using the system to achieve this value is 400 ℃ · day. New York State is about 400 ℃ · day. Aomori warm winter in 2009, the value is 70 ℃ · day, the number of days in previous years, the cold more.
Heat pump can save the planet?
Fujikura future plans for the electronic equipment by increasing the original size of the development of heat pumps, will be applied to road snow melting systems and data centers. The company said that "great potential for large-scale heat pump if the pump can buried in glaciers, will be able to prevent the melting of glaciers, thereby slowing the rate of global warming. In addition, if we can create a long 10km, 1km diameter of the heat pump, the The 10TW can humans heat transport to the stratosphere. "
