Page 213 - Alternative Energy Systems in Building Design

CALIFORNIA TITLE 24 ELECTRIC ENERGY COMPLIANCE 189

approach. It should be noted that there is no general restriction regarding where or how
general lighting power is used, which means that installed lighting could be greater in
some areas and lower in others, provided that the total lighting energy wattage does
not exceed the allowable lighting power.
A second type of lighting tradeoff, which is also permitted under the standards, is a
tradeoff of performance between the lighting system and the envelope or mechanical
systems. Such a tradeoff can be made only when permit applications are sought for
those systems filed under performance compliance, where a building with an envelope
or mechanical system has a more efficient performance than the prescriptive efficiency-
energy budget, in which case more lighting power may be allowed. Figure 5.9 repre-
sents a typical energy distribution percentage in commercial buildings.
When a lighting power allowance is calculated using the previously referenced
performance approach, the allowance is treated as if it is determined using one of the
other compliance methods. It should be noted that no tradeoffs are allowed between
indoor and outdoor lighting or lighting located in non-air-conditioned spaces.

Mandatory measures Mandatory measures are compliance notes that must be
included in the building design and on the engineering or Title 24 forms stating
whether compliance is of the prescriptive or performance method building occupancy
type. The main purpose of mandatory features is to set requirements for manufacturers
of building products, who must certify the performance of their products to the
CEC. However, it is the designer’s responsibility to specify products that meet these
requirements.

Indoor lighting
33%
Heating
2%

Cooling
16%
Office equipment
2%
Outdoor lighting
6%
Cooking
1%
Fans
Refrigeration
10%
7%
Water heating
1%
Miscellaneous
22%
Figure 5.9 Lighting energy-use distribution chart. Courtesy of CEC.