Appendix B 357
- The boundary of this ECM was drawn to include the ceiling
mounted lighting circuits fed by the 277 volt supply, and the ra-
diation heating system. The associated decrease in air conditioning
load was considered trivial since little of the school is air condi-
tioned, and most of it is closed for the summer months. - The baseyear conditions are those of the 12 months immediately
preceding the decision to proceed with the project. They included
a lighting level survey, description location and number of lamps
ballasts and fixtures. - Engineering calculations determined that the ECM would increase
boiler load by the energy equivalent of 6% of the lighting savings
from November through March. This number was estimated to
range between 4% and 8%. - The boiler efficiency in winter was estimated to be 79% under
typical winter conditions. - The baseyear fuel use from the gas utility bills from November
through March is 2,940 × 103 ft^3 (83.25 × 103 m^3 ). - The lighting operating periods of the post-retrofit period are se-
lected as the common set of conditions for the energy use terms
in Equation 1 of Chapter 3. - Baseyear lighting periods were established through one month
logging of lighting in representative areas. Lighting period logs
established the following annual load/duration data for the base-
year:
Baseyear Load/Duration
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Fraction of Lighting Load On Hours Per Year
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9% 240
61% 1,450
15% 2,500
6% 6,100
9% 8,760
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