Credit 9: Right-size Laboratory Equipment Load
"Right-size" mechanical equipment by improving estimates
of heat-gain from laboratory and process equipment.
Credit 9.1 (1 point)
Measure base usage of equipment electrical loads in a comparable
laboratory space for each functional type of laboratory space and
design electrical and cooling systems based on these measurements.
Credit 9.2 (1 point)
Design electrical distribution system to provide for portable or
permanent check metering of laboratory equipment electric consumption.
Design for safe access to electrical feeder enclosures and provide
sufficient space to attach clamp-on or split core current transformers.
A comparable laboratory space is one in which the equipment type,
quantity and use profile is similar to the proposed laboratory
For each comparable laboratory space, obtain one week (7 days)
of continuous power metering at a distribution panel level of
equipment, including plug loads and hard-wired equipment, from
a similar laboratory facility. The laboratory spaces for which
measured data is applicable should collectively constitute at least
75% of the net laboratory space. Metering data should be obtained
while the spaces are fully occupied. Continuous metering data should
be time averaged over 15 minute time periods. Design
heat load criteria for each typical laboratory space in the facility
should then be based on the maximum load indicated over the metering
period, with no more than 50% added for a safety factor or for
future changes in load, unless a reason for exceeding this limit can be justified.
Technologies & Strategies
Heat loads from laboratory equipment are often significantly overestimated
leading to grossly oversized mechanical and electrical equipment.
This results in wasted first cost, and inefficient operation. Measured
data should be used for estimating loads. Allowances for future
growth should be taken judiciously. Designing the system so that
additional capacity can be added in the future is recommended, and
can be achieved through modular design of HVAC and electrical systems.
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