Analysis of the structure of liquid cooling energy storage cabinet

Indirect liquid cooling is currently the main cooling method for the cabinet power density of 20 to 50 kW per cabinet. An integrated energy storage batteries (ESB) and waste heat-driven cooling/power generation system was proposed in this study for energy saving and operating cost reduction.

The total energy consumption includes the energy consumptions of the cabinets, uninterruptible power supply (UPS), cooling system, lighting system, power transfer, and distribution system. The PUE of the liquid cooling data centers can usually be reduced to below 1.3 [6, 7].

However, for places with high ambient temperatures like Shenzhen, its liquid cooling PUE may still be higher than 1.3, and this is why the local liquid cooling data centers need energy-saving retrofitting to meet local policies for PUE in Shenzhen.

The PUE of the liquid cooling data centers can usually be reduced to below 1.3 [6, 7]. For places with low ambient temperatures, their PUE is supposed to be lower than this value for a higher cooling system efficiency and larger natural cooling time.

Waste heat from a liquid cooling data center was utilized to drive an adsorption refrigeration cycle in Ref., and the generated refrigeration capacity of the ARC was further used for air cooling. It was found that for a 350 kW water cooling system and a 50 kW air cooling system, the discounted payback period (DPB) was as low as 285 days.

As both the operation status of the original data center and the proposed system are related to the ambient temperature, the system energy saving is heavily dependent on the ambient temperature. Relative humidity also has an influence on the temperature of the circulated cooling water, which further affects the cooling mode of the proposed system.