陆谦逸，贾力
（微细尺度流动与相变传热北京市重点实验室）
A rack cooling system based on a large scale flat plate pulsating heat pipe is proposed. The heat generated from IT equipment in a closed rack is transferred by the rear door pulsating heat pipe to the chilled air passage and is avoided to release into the room. The influence of the start-up performance of the heat pipe, the load of the rack and the load dissipation to the temperature and the velocity distribution in the rack are discussed. It is found that the temperature would be lower and the temperature distribution would be more uniform in the rack when the pulsating heat pipe is in operation. Also, the effect of rack electricity load on temperature distribution is analyzed. It is indicated that higher velocity of chilled air will improve heat transfer of the rack.
The figure shows the temperature difference between evaporator and condenser sections with time at the heating power of 548.51W and 791.73W. The decrease of the temperature difference illustrated that the pulsating heat pipe was activated, as the liquid slug evaporated in the evaporator section and forced the vapor slug moved to the condenser section to be condensed with the energy output.
Conclusions
- The start-up of PHP makes the temperature lower and the temperature distribution more uniform in the rack. The higher heating power produces the shorter start-up time and the faster heat transfer.
- There is an optimal load coupled with the filling ratio of the pulsating heat pipe when the temperature distribution in the rack is the most uniform.
- A lower temperature of the rack will be reached as the velocity of the chilled air increases.
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