Process Management Principles for Increasing the Energy Efficiency

In general experience suggests that a good rule of

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Unformatted text preview: gests that a good rule of thumb is that equipment uses about half the maximum power when it is on, though this can vary significantly with operating mode and type of equipment. Hand-held Ammeter Readings Handheld ammeters, readily available and familiar to electricians, provided more accurate but still limitedi measurements of actual current and did not require equipment shut down. For analyses using this method, we assume voltage to the equipment is constant at the required level indicated by the equipment power label. Using Equation 4.1 and Equation 4.2, we can then calculate instantaneous real power. A drawback to this method, beyond the inability to measure the power factor p, is that it is impractical to continuously monitor current using a handheld meter. Whenever using this method, we attempted to sample power draw for each piece of equipment in several operational modes, though this was not always practical given production scheduling. Watts Up Pro Wattmeter The Watts Up Pro meter accurately measures the instantaneous real power usage for any equipment that can be plugged into single phase 120V circuits (i.e. the ubiquitous three-pron...
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