Analyzing Power Consumption

Evaluating the power consumption and heat output from various electronics calibration and electrical calibration equipment All electrical appliances that consume energy generate heat.  The quantity of heat generated is approximately equal to the quantity of energy consumed. Normally, heat (which is just a form of energy) is not measured in watt-hours, but in units such as calories or joules or BTUs.  


When it comes to data center design, operation and optimization, it is all about power and cooling. Of course, the power supplied and the heat removed is closely related: in their simplest form, both are just measures of energy. Yet, it is often difficult to directly compare the two.Power and cooling each have their own language. For electrical calibration equipment systems, we use terms like volts, amps, KVA and watts. When discussing cooling we usually talk in terms of tons and BTUs. So, while power and cooling are related, sometimes something gets lost in translation. 


The equipment nameplate is one possible place to start. On each piece of equipment (or in the manual) there will be a specified power requirement. This is usually given in Volt Amps (VA). You could count up and sum the power requirements for all the equipment. However, keep in mind the nameplate is required to list the maximum possible consumption (so wiring and circuit breakers can be properly planned). Actual consumption is usually much less, especially when averaged across all devices. A better-and often easier-approach is to measure the output power at the UPS or PDU.BTU and ton are the most common terms used in heating and cooling calculations. Both are expressions of thermal energy. 


A BTU is the amount of heat required to raise the temperature of 1 avoirdupois pound of liquid water by 1 degree Fahrenheit at a constant pressure of one atmosphere. As with the calorie, several definitions of the BTU exist, because the temperature response of water to heat energy is non-linear. This means that the change in temperature of a water mass caused by adding a certain amount of heat to it will be a function of the water's initial temperature. 

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