( 23rd October 2019 )
Today, we are discussing about the type of mining rack.
Regarding Advanced air cooling method
Here is one example of rack based air cooling system designed in Japan. The rack-type air conditioning system consists of an aisle capping that divides the cold aisle with a roof and a door, and a rack-type air conditioner (FTASCL-RS / C) for mining centers developed specifically. This configuration is shown below:
1) Separation of IT equipment intake and exhaust flow (aile capping)
In the conventional method, in places where cold air from the air conditioner is difficult to reach, heat accumulation may occur due to the high temperature exhaust from the hot aisle to the cold aisle.
In such an environment, the air flow rate of the air conditioner has to be increased and the air flow power has increased. In this system, the problem of heat accumulation was solved by dividing the air flow of the two zones by aile capping.
2) Direct cold air supply to the cold aisle (rack type air conditioner)
In the conventional method, it was necessary to send a large air volume to the distant place via the double floor for heat treatment of high heat generation IT equipment. In this system, air conditioning was adopted to supply cold air directly from inside the rack row to the cold aisle, and the air blowing distance was shortened. Furthermore, the use of a high-efficiency turbofan reduces the power required to blow air.
3) Direct collection of heat from hot aisle (rack type air conditioner)
In the conventional method, part of the supplied air conditioning cold air does not cool IT equipment and returns from the cold aisle to the air conditioner. Therefore, the suction temperature of the air conditioner did not rise, and the operation efficiency of the refrigeration cycle decreased. In this system, high cooling efficiency was realized by adopting an air conditioning configuration that can collect the exhaust (30 to 40 ° C) of IT equipment directly from the hot aisle.
4) High sensible heat design of indoor unit (rack type air conditioner)
The heat load of the mining center is mainly the sensible heat load generated from IT equipment, and the latent heat load generated from the outside air and the human body is smaller than that in a general office. Therefore, operating the air conditioner with high sensible heat that is hard to be dehumidified is energy saving without unnecessary humidification / dehumidification. The air conditioner is designed with the sensible heat ratio increased to about 1.0 under standard operating conditions.
5) Scroll compressor dedicated to annual Cooling-Low pressure ratio control (Rack type air conditioner)
Low pressure ratio control
Based on the characteristics of the mining center air conditioning that is annual cooling, we introduced control that achieves high efficiency operation by operating the condensing pressure as low as possible during the low and mid temperatures during which the reliability of the compressor is low.
Two-year cooling scroll compressor
We applied an over-compression prevention valve based on the latest compressor (asymmetric tooth profile) and developed a compressor dedicated to this application. By applying the over compression prevention valve, the efficiency improvement of the low pressure ratio, flattening of the efficiency for the pressure ratio (outside temperature) and expansion of the operable range were realized, and the function of the low pressure ratio control was further brushed up. In addition, DC motor was used for the compressor to pursue efficiency improvement.
The rack-type air conditioning system is expected to achieve annual COP * 1 (Tokyo) through the aforementioned aile capping and rack-type air conditioner efficiency improvement technology.
By applying this air conditioning system, annual power consumption is expected to be reduced by 58% compared to the conventional double floor air conditioning system to which general computer air conditioners are applied.
Fig-1: Mining Rack
Furthermore, instead of just dumping the waste heat from the mining factory, attempts have been launched overseas to help heat other buildings. There are cases in Japan where waste heat from mining factories is used for greenhouse cultivation, and attempts are being made to return some of the energy consumed by mining factories to society.
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