The ability of traditional room-conditioning systems to accommodate expanding information technology loads is limited in contemporary data centers, where the storage, storing, and processing of data have grown quickly as a result of evolving technological trends and rising demand for online services, which has led to an increase in the amount of waste heat generated by IT equipment. Through the implementation of hybrid air and liquid cooling technologies, targeted, on-demand cooling is made possible by employing various techniques, which include but are not limited to in-row, overhead, and rear door heat exchanger cooling systems. One of the liquid cooling techniques will be examined in this study based on different conditions for high-power density racks (+50 kW). This paper investigates the cooling performance of a liquid-to-air in-row CDU in a test rack containing seven thermal test vehicles under various conditions, focusing on cooling capacity and HX effectiveness under different supply air temperatures. This test rig has the necessary instruments to monitor and analyze the experiments on both the liquid and the air sides. Moreover, another experiment is conducted to assess the performance of the CDU that runs under different control fan schemes, as well as how the change of the control type will affect the supply fluid temperature and the TTV case temperatures at 10%, 50%, and 100% of the total power. Finally, suggestions for the best control fan scheme to use for these units are provided at the conclusion of the study.

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