The Energy Audit 175
analysis to examine alternative equipment and operations that
would reduce energy costs for heating, ventilating, and air condi-
tioning.
- Electric Motors: An inventory of all electric motors over one horse-
power should also be taken. Prepared data sheets can be used to
record motor size, use, age, model number, estimated hours of
operation, other electrical characteristics, and possibly the operat-
ing power factor. Measurement of voltages, currents, and power
factors may be appropriate for some motors. Notes should be
taken on the use of motors, particularly recording those that are
infrequently used and might be candidates for peak load control
or shifting use to off-peak times. All motors over one hp and with
times of use of 2000 hours per year or greater are likely candidates
for replacement by high efficiency motors—at least when they fail
and must be replaced.
- Water Heaters: All water heaters should be examined, with data
recorded on their type, size, age, model number, electrical charac-
teristics or fuel use. What the hot water is used for, how much is
used, and what time it is used should all be noted. Temperature
of the hot water should be measured.
- Waste Heat Sources: Most facilities have many sources of waste
heat, providing possible opportunities for waste heat recovery to
be used as the substantial or total source of needed hot water.
Waste heat sources are air conditioners, air compressors, heaters
and boilers, process cooling systems, ovens, furnaces, cookers,
and many others. Temperature measurements for these waste heat
sources are necessary to analyze them for replacing the operation
of the existing water heaters.
- Peak Equipment Loads: The auditor should particularly look for
any piece of electrically powered equipment that is used infre-
quently or whose use could be controlled and shifted to offpeak
times. Examples of infrequently used equipment include trash
compactors, fire sprinkler system pumps (testing), certain types of
welders, drying ovens, and any type of back-up machine. Some
production machines might be able to be scheduled for off-peak.
