ENERGY CONSERVATION METHODS
Energy Conservation by Optimization of Controls
Intermittent Occupancy Controls. Classrooms,
conference rooms, cafeterias, and other areas with intermittent
occupancy shall have occupied/unoccupied switches. These
switches shall function to eliminate conditioning of spaces when
the room is not being used.
Space Temperature Requirements for Interior Zones.
Refer to MIL-HDBK-1190.
nighttime, reset schedule. During occupied periods, excessive
internal heat gains are produced by internal loads (for example
people, lighting, and equipment). Perimeter radiation systems
shall be designed for the absence of these loads while
maintaining night setback temperature. When used with VAV
systems without reheat coils, provide radiation capacity to heat
ventilation air to room setpoint during occupied cycle. Do not
oversize but do add a 10 percent allowance for morning warm-up
after night setback.
Energy Efficient Control System
A-1.04.1 Night Setback. A night setback allows the heating
system to cycle automatically at the minimum allowable space
temperature. These systems are generally provided with time
clocks. Use electronic programmable time clocks or DDC programs
for night, weekend, and holiday temperature setback (or cutoff)
in the winter and set up (or cutoff) in the summer to reduce
heating and cooling loads respectively. Normally, when
unoccupied, air conditioning for personnel comfort will be cut
off and heating will be reduced by approximately 15 degrees F.
A.1.04.2 Occupied/Unoccupied Hot Water Reset Schedule. An
occupied/unoccupied hot water reset schedule is a dual setting
system which allows for use of internal heat from equipment,
lights, and people as part of the heat supply during occupied
hours. See Figure A-1. During occupied hours, the setting is
lower than during unoccupied hours, when there is not as much
internal heat gain.
A-1.04.3 Direct Digital Control (DDC). DDC control systems
provide the functions of a typical building automatic control
system. Systems can also provide an effective operator interface