Abstract
In contrast to existing room-level cooling systems, rack-level cooling systems can solve local hot spot issues due to their on-demand cooling way with higher energy efficiency and higher supply cooling temperatures. However, the multi-split backplane cooling system, which is a typical rack-level cooling way, makes it easy to cause insufficient refrigerant supply problems due to higher evaporating pressure under the same ambient condition. To solve above problems, a suitable condensing pressure relative to evaporating pressure is a critical optimized parameter, which needs to follow with the change of ambient condition. Therefore, a variable pressure differential control method between the condensing side and the evaporating side is proposed based on online fuzzy inference. A Modelica-based simulation model is built to validate the proposed method. Results show that the proposed method can ensure the terminal cooling effect at different ambient temperatures. Compared with the fixed condensing pressure control method, the proposed method shows an increase of 13.3% in system coefficient of performance (COP) with lower condensing pressure.
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