Its mission is to be recognized by all areas of the datacom industry as the unbiased engineering leader in HVAC and an effective provider of technical datacom information. TC 9.9 was formed in response to the lack of effective information transfer between the building, HVAC, and IT industries. This article serves as a continuation of those articles in documenting the activities of TC 9.9 since then. This history was documented in articles by Roger Schmidt (2012) and Don Beaty (2005).
This consortium evolved into ASHRAE Technical Committee 9.9 (TC 9.9). In 1999, a group of thermal engineers from different IT manufacturing companies formed a thermal management consortium. Mechanical load component per ANSI / ASHRAE Standard 90.4 – 2016 is calculated by the sum of all cooling, fan, pump, and heat rejection annual energy use divided by the data center ITE energy (annualized MLC) or the sum of all cooling, fan, pump, and heat rejection design power divided by the data center ITE design power (design MLC).ĪSHRAE liquid cooling classes for liquid-cooled IT equipment Heating, ventilation and air conditioning The design ELC is the combined losses of three segments of the electrical chain: incoming electrical service segment, UPS segment, and ITE distribution segment. ASHRAE allowable thermal envelopes as defined in Thermal Guidelines for Data Processing Environments that represent where IT manufacturers test equipment to ensure functionalityĪmerican Society of Heating, Refrigerating and Air-Conditioning Engineersĭata processing and communication facilities, that include rooms or closets used for communication, computers, or electronic equipment.Įlectrical Loss Component per ANSI / ASHRAE Standard 90.4 – 2016.
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