Page 153 - Alternative Energy Systems in Building Design

SOLAR POWER SYSTEM DEPLOYMENT 129

approximately 6000 W. Occupancies that are not fully inhabited throughout the day
may require a somewhat smaller system.
In general, an average 8 hours of habitation time should be used for sizing the solar
power system, which in this example would yield a total daily power demand of
24,000 Wh, which, in turn, translates into a 4000-W solar power system.

EXAMPLE OF A COMMERCIAL SOLAR POWER PROJECT
The following plan is provided for illustrative purposes only. The actual design criteria
and calculations may vary depending on the geographic location of the project and the
cost of labor and materials, which can vary significantly from one project to another.
The following project is a collaboration among the identified organizations.

Project design criteria The project described here is a 70-kW roof-mounted solar
power cogeneration system deployed on the rooftop of Arshag Dickranian School in
Hollywood, California (Fig. 3.65). The design and estimating procedures of this project
are similar to those of the residential project discussed earlier.
In order to establish the requirements of a solar power system, the design engineer
must determine the commercial power-demand calculations based on the NEC design
guidelines. Power-demand calculations for commercial systems depend on the project

Figure 3.65 Roof-mounted solar power system, Arshag Dickranian School,
Hollywood, California. Photo courtesy of Vector Delta Design Group, Inc.