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Advisor(s)
Abstract(s)
As the world data traffic increasingly grows, the need for computer room air conditioning
(CRAC)-type equipment grows proportionally. The air conditioning equipment is responsible for
approximately 38% of the energy consumption of data centers. The energy efficiency of these pieces
of equipment is compared according to the Energy Standard ASHRAE 90.1-2019, using the index
Net Sensible Coefficient Of Performance (NetSCOP). This method benefits fixed-speed compressor
equipment with a constant inlet temperature air-cooled condenser (35 C). A new method, COP
WEUED (COP–world energy usage effectiveness design), is proposed based on the IPLV (integrated
part load value) methodology. The IPLV is an index focused on partial thermal loads and outdoor
temperature data variation for air intake in the condenser. It is based on the average temperatures of
the USA’s 29 major cities. The new method is based on the 29 largest cities worldwide and with datacenter-
specific indoor temperature conditions. For the same inverter compressor, efficiencies of 4.03
and 4.92 kW/kW were obtained, using ASHRAE 90.1-2019 and the proposed method, respectively.
This difference of almost 20% between methods is justified because, during less than 5% of the annual
hours, the inlet air temperature in the condenser is close to the NetSCOP indication.
Description
Keywords
ASHRAE 90.1 Data Center IPLV Net Sensible COP AHRI 1361