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Reheating the air is the simplest solution, but is often restricted under energy codes. An acceptable solution is to vary the volume of air to the perimeter and to combine it with a terminal heating coil or a separate perimeter heating system, either baseboard, overhead air heating, or a fan-powered terminal unit with supplemental heat. The perimeter heating should be individually controlled and integrated with the cooling control. Lowering the supply water temperature when less heat is required generally improves temperature control.
Ancillary equipment associated with central steam heating plants consists primarily of the boiler feed unit, deaerator unit (both with receiver and pumps), chemical feed, and possibly a surge tank and/or heat exchanger(s). Boiler feed equipment, including the receiver(s) and associated pump(s), serve as a reservoir for condensate and makeup water waiting to be used by the steam boiler. The boiler feed pump provides system condensate and water makeup back to the boiler on an asneeded basis. Deaerators help eliminate oxygen and carbon dioxide from the feed water (see Chapter 49 of the 2015 ASHRAE Handbook—HVAC Applications for more information).
2016 ASHRAE, Inc. Heating The basic methods used for heating include the following: • Steam uses the latent heat of the fluid. Fig. 2 Direct-Expansion or Chilled-Water Cooling and Dehumidification Fig. 5 • Hot-water (fluid-filled) coils use temperature differences between the warm fluid and the cooler air. • Electric heat also uses the temperature difference between the heating coil and the air to exchange energy. • Direct or indirect gas- or oil-fired heat exchangers can also be used to add sensible heat to the airstream.