Appendix C 441
Table 3: The M&V Procedure (Continued)
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a) Often, pre-retrofit values of IEQ parameters are
compared to post-retrofit values. b) Many IEQ pa-
rameters change with time because of changes in
building operation, indoor pollutant emission rates,
or outdoor air quality. Measurements should take
place under the relevant conditions (e.g., minimum
outside air supply) or they should average over the
range of conditions. If weather, outdoor air quality,
- Select measurement or occupancy differ significantly between the pre-
and or assessment periods post-retrofit measurement
periods, a comparison of pre-retrofit and post-retrofit
measurements may not accurately indicate the effect
of the energy conservation on IEQ. c) Indoor thermal
conditions and pollutant concentrations in buildings
do not respond instantly to changes in the controlling
factors. d) Instantaneous measurements of tempera-
tures, humidities, and air pollutant concentrations
will often not be valuable.
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a) Thermal comfort standards provide guidance for
measurement locations. b) Measurement locations
should yield data representative of conditions experi-
enced by occupants. Worst-case locations may also - Select measurement be monitored. c) The breathing zone is most im-
locations portant location for air pollutant measurements. d)
Pollutant concentrations in HVAC return airstreams
may approximately represent average concentration
in section of building from which the return air is
drawn (except with displacement ventilation).
———————————————————————————————— - Define acceptable Expenditure should generally be small compared to
M&V costs expected savings from energy conservation mea-
sures.
———————————————————————————————— - Select M&V Instrumentation must satisfy accuracy, cost, and
instrumentation data logging requirements
———————————————————————————————— - Inform occupants of Unexplained measurements may cause occupants
M&V plans concern about IEQ.
———————————————————————————————— - Implement Methods employed should meet accuracy, space,
and
measurements, temporal specifications and cost constraints.
surveys, or modeling
———————————————————————————————— - Analyze and report Results should generally be available to occupants.
results
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