Impact of operating conditions on a chiller-less data center test facility with liquid cooled servers

Effect of warm water cooling for an isolated hybrid liquid cooled server

“…While several reports have discussed the use of hybrid air-liquid cooling by servers and in data centers [14,15,16,17], there has been little discussion of air flow and ducting for the auxiliary components. The server chassis with a form factor 2OU (88.9 mm) incorporates Intel Xeon 2570 dual CPUs, each dissipating a thermal design power (TDP) of 115W; specifications of the processor available in [21].…”

Experimental and numerical dynamic investigation of an energy efficient liquid cooled chiller-less data center test facility

“…A great portion of the cooling energy is used by the CRAH units and the chillers. To reduce the energy used by cooling methods, one approach is to reduce or minimize the need for both CRAH units and chiller plants [5].…”

“…Waterside and airside economization have also attracted a great deal of research effort. The basic principle of air side economization is to use the ambient air to cool the server heat load without using any intermediate refrigeration component [5]. Water side economization uses a wet or dry tower attached to a coolant distribution unit, which supplies chilled water to either the rear door heat exchanger or to a fully-enclosed cabinet with a water cooled heat exchanger [11].…”

“…This technology enables a no-chiller and no-CRAH unit design for data center room cooling with extremely high energy efficiency, while also isolating the IT equipment from any potential harmful outside environmental contamination [14]. The detailed description and information of this cooling technology concept and apparatus design are presented in [5,14]. Iyengar et al have presented a complete introduction combined with detailed photographic representation of this cooling system design, including the infrastructures inside and outside building, internal and external loops, and the server cooling hardware [14].…”

“…Iyengar et al have presented a complete introduction combined with detailed photographic representation of this cooling system design, including the infrastructures inside and outside building, internal and external loops, and the server cooling hardware [14]. Comprehensive experimental characterizations of the key cooling component used in this cooling infrastructure are presented by David et al [5]. The impact of changes in liquid flow rate operating conditions, external liquid fluid type and heat exchanger configurations of the buffer unit, variations in the fluid flow rate conditions and ambient weather conditions, and blower speed of the dry cooler were investigated to determine their impact on the energy consumption and thermal performance.…”