(10.76 W/m2), but could vary from a low of 0.5 W/ft2 (5.38 W/m2) to a
high of 1.5 W/ft2 (16 W/m2) depending on the specific tasks to be
performed. A minimum of 0.1 W/ft2 (1 W/m2) for auditoriums to a maximum
of 2.5 W/ft2 (27 W/m2) for machine shops is possible, although the upper
limit would occur very rarely. Mechanical spaces in building storage areas
and similar spaces in which outlets are provided but infrequently used are
usually neglected in computing loads, except for special cases.
Electric Power Loads. Electric power loads shall include all loads
other than lighting loads and those served by general purpose receptacles and
comprise the environmental system electric power requirements and the
facility occupancy equipment electric power requirements.
System Loss. A system loss of approximately 6 percent, based on
calculated maximum demand, should be added to the building load.
Demand and Load Factors. The demand and load factors for a
specific facility will vary with the division of load and hours of usage.
Refer to Tables 2 and 3 for values that can be applied to determine demand
and load factors. Table 4 is included as a guide and an aid in illustrating
the method of determining loads, which are calculated for a particular type
of building, such as an academic and general instruction building (Navy Code
171-10). The values given are empirical and will vary from activity to
activity, and may vary from one facility to another within an activity.
Annual hours use of demand must be determined for each case in accordance
with methods of operation and characteristics of the installation. Demand
factors and load factors for individual facilities by the Navy category code
given in Table 1 are based on a survey of existing Navy facilities and past
experience. Such factors should be used for quick estimating purposes and
as a check when a more precise calculation is undertaken (refer to Table 4).
Guides for Demand Factors.
For guides on the selection of demand
factors, refer to Table 5.
Guides for Load Factors. Guides for the selection of load factors
indicate the need for special considerations (refer to Table 6). Factors in
the middle of the range are for the average facility at the peacetime shore
establishment and should be used unless the guides in Table 6 indicate
Load Growth. Determine the requirements for load growth for
anticipated usage and life expectancy with particular attention to the
heating, electric data processing, and electronic communication equipment.
Before determining the size of service and method of distribution to a
facility, an economic analysis shall be made to determine the most feasible
way of serving this future load. This analysis shall include the effect on
the existing installation if future loads require reinforcing or
rehabilitation of the service system.