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standard by ASHRAE, 2014
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Standard 41.11 prescribes methods for power measurements. This first edition of the standard includes electrical and nonelectrical power measurements for heating, ventilating, air-conditioning, and refrigerating (HVACR) laboratory and field applications. It also also contains descriptions and measurement methods for the predominant forms of nonelectrical power in HVACR applications, including shaft power, the power derived from the first law of thermodynamics, and the fluid power output from a pump.
This standard is intended to be used with IEEE 120-1989, Master Test Guide for Electrical Measurements in Power and relies on IEEE 120 to provide fundamental guidance and more detailed information for electrical power measurement. http://standards.ieee.org/findstds/standard/120-1989.html