MIL-HDBK-1003/3
APPENDIX A (Continued)
A-3.08
Heat-of-Light Heat Recovery Method. The sensible heat
given off by the lighting fixtures is a large portion of the
total cooling load. Recovery of this heat reduces energy usage
both by reducing the room cooling load and by recovering usable
heat. In some instances, the efficient removal of heat-of-light
that does not enter the room may reduce the air supply to the
room below that which is desirable. Verify that effective air
circulation is maintained. Recommended methods of heat-of-light
recovery are the light troffer and induced air methods. Where
life cycle cost effective, use heat-of-light recovery method in
air conditioned spaces. Do not use for clean rooms, animal
laboratories, and laboratories with toxic, explosive, or
bacteriological exhaust requirements.
A-3.09
Light Troffer Method. The light troffer method removes
space air by pulling it through a light troffer or through a
light fixture, and transfers it into the ceiling plenum where it
is routed into the return air system. See Figure A-9. With this
system, the room cooling load is reduced. Also, less air is
required to cool the room, making it possible to use smaller duct
and fan systems. Do not use for VAV systems.
With this method, the total cooling load is
substantially reduced for outdoor air supply systems, but not as
significantly for systems not capable of providing 100 percent
outdoor air. This technique also reduces the luminaire surface
temperature and, therefore, increases ballast and lamp life.
A-3.10
Induced Air Method. The induced air method removes air
from the space by pulling it through the light troffer or through
a lighting fixture, and transfers it into the ceiling plenum, to
be recirculated or discharged outdoors. See Figure A-10.
A-3.11
Refrigeration Heat Recovery Method. The refrigeration
heat recovery method uses heat rejected from the refrigeration
machine. This method uses four different techniques:
a)
Conventional refrigeration machine method,
b)
Heat pump method,
c)
Single condenser water circuit method, and
d)
Double condenser water circuit method,
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