sing warm water to keep the servers under 60°C. This is implemented with direct to chip cooling where the water removes the heat directly from the heat sink on the server. With this method, the input water needs to be at a temperature of around 40°C and the output water is around 60°C. The benefit of this method is that since the ambient temperature is usually 40°C or lower, the water can be cooled without using a refrigeration cycle. The heat can also be used for heating the building when the weather is cold. In addition our adsorption chiller can use this free heat for cooling the building or the servers as needed.
The warm water cooling concept is relatively and has seen some recent adoptions. To date,the Direct-to-chip server cooling method has received significant research and development from industry leaders such as IBM and government organizations such as the US National Renewable Energy Laboratory (NREL). Aquasar was the first warm water cooled supercomputer developed by IBM in association with ETH Zurich. It runs with a 60°C water inlet temperature to the servers with a 65°C return temperature while maintaining a server temperature below the maximum rated 85°C. More recently, IBM has released the first commercially available hot-water cooled supercomputer based off the Aquasar technology known as SuperMUC. SuperMUC delivers warm water at 40°C with a return temperature of 60°C. Additionally, NREL has developed a new High-Performance Computing (HPC) data center in Colorado, USA in partnership with Intel and HP that has a Power Usage Effectiveness of 1.06 using warm water cooling in combination with direct-to-chip servers. Many other private companies such as Asetek and CoolIT Systems have also developed direct-to-chip servers which currently support warm water up to 40°C. Asetek recently signed a $3.5 million direct-to-chip liquid cooling deal with the California Energy Commission for two large-scale supercomputing data centers.
This technology definitely seems like a sustainable and cheap option. It minimizes the unnecessary energy consumption and can be a perfect partner to adsorption cooling.

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