Mixed systems produce little or no thermal stratification of air within the space. Room air diffusion methods can be classified as one of the following as shown in Figure 1: Chapter 20 in the 2016 ASHRAE Handbook-HVAC Systems and Equipment describes the characteristics of various air inlets, outlets, fan-coil units, chilled beams, air curtain units, and terminal units, as well as selection tools and guidelines. For a discussion of various air distribution strategies, tools, and guidelines for design and application, see Chapter 57 in the 2015 ASHRAE Handbook-HVAC Applications. For information on naturally ventilated spaces, see Chapter 16. This chapter is intended to present HVAC designers the fundamental characteristics of air distribution devices. Although air terminals (inlets and outlets), terminal units, fan-coil units, local ducts, and rooms themselves may affect room air diffusion, this chapter addresses only air inlets and outlets and their direct effect on occupant comfort. R oom air distribution systems are intended to provide thermal comfort and ventilation for space occupants and processes.
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