ASHRAE Handbook 2016: HVAC Systems and Equipment (SI) by ASHRAE


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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.

Many jurisdictions require monitoring, alarms, evacuation procedures, separating refrigeration and fuel-fired equipment, and high rates of purge ventilation. A proper operating environment for equipment and those maintaining it must also be provided. This may involve heating the space for freeze protection and/or cooling the space to prevent overheating motors and controls. , switchgear room, office space, generator room, pump room, machine shop). Where refrigeration equipment is installed, follow design requirements in ASHRAE Standard 15.

Some of these applications allow the designer to reduce air volume during unoccupied periods while still maintaining space pressure control. Allair systems are generally the only systems able to combine space pressure control with temperature, humidity, and/or air filtration control. Other Considerations All-air systems operate by maintaining a temperature differential between the supply air and the space. Any load that affects this differential and the associated airflow must be calculated and considered, including the following: • All fans (supply, return, and supplemental) add heat.

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