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Extra resources for ASHRAE Handbook 2016: HVAC Systems and Equipment (SI)
Interior spaces with a roof exposure, however, may require treatment similar to perimeter spaces that require heat. Space Heating Although steam is an acceptable medium for central system preheat or reheat coils, low-temperature hot water provides a simple and more uniform means of perimeter and general space heating. Individual automatic control of each terminal provides the ideal space comfort. A control system that varies water temperature inversely with the change in outdoor temperature provides water temperatures that produce acceptable results in most applications.
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. The effect on the airstream for each of these processes is the same and is shown in Figure 5. For basic equations, refer to Chapter 1 of the 2013 ASHRAE Handbook—Fundamentals.
6. SPACE CONSIDERATIONS In the very early phases of building design, architects, owners, and space planners often ask the engineer to estimate how much building space will be needed for mechanical equipment. The type of mechanical system selected, building configuration, and other variables govern the space required, and many experienced engineers have developed rules of thumb to estimate the building space needed. Although few buildings are identical in design and concept, some basic criteria apply to most buildings and help approximate final space allocation requirements.
ASHRAE Handbook 2016: HVAC Systems and Equipment (SI) by ASHRAE