MIL-HDBK-1003/3
APPENDIX A (Continued)
The closed loop method consists of two coils (one in
the supply system and one in the exhaust system), a pump, and a
closed pipe loop. This method can be expected to increase the
outdoor air temperature by 60 to 65 percent of the outdoor air
and exhaust air temperature difference. If the winter design
temperature is 32 degrees F or below, this system requires an
antifreeze solution.
A-3.05
Runaround System (Open Loop) Method. The open loop
method transfers sensible and latent heat. This is an
air-to-liquid, liquid-to-air enthalpy recovery system where
working fluid flows into each cell with the aid of a pump, in a
manner similar to cooling tower flow. See Figure A-8. Sorbent
liquid used with this system can be bacteriostatic, if necessary.
The open loop method shall not be used for high temperature
applications.
A-3.06
Ancillary Components. Ancillary components for exhaust
air heat recovery methods include:
a)
Energy recovery devices for supply/exhaust filters,
b)
Preheat coils,
c)
Backdraft dampers,
d)
Exhaust dampers,
e)
Recirculation dampers,
f)
Face and bypass dampers, and
g)
Drainage provisions.
Controls and ancillaries shall be shown on drawings and
supplemented by specifications, as necessary. Select the minimum
acceptable energy transfer effectiveness and the maximum
acceptable cross-contamination.
A-3.07
Condensate Cooler/Hot Water Heat Recovery Method. The
condensate cooler/hot water heat recovery method uses a heat
exchanger, which removes heat from condensate not returned to the
boiler. This recovered heat can be used to preheat domestic hot
water, boiler makeup water, or low temperature water return to
boiler or heat exchanger.
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