Diffusers

Listing ID #3662296

A diffuser is the mechanical device that is designed to control the characteristics of a fluid(liquid or gas) at the entrance to a thermodynamic open system. Diffusers are used to slow the fluid's velocity and to enhance its mixing into the surrounding fluid. In contrast, a nozzle is often intended to increase the discharge velocity and to direct the flow in one particular direction.
Flow through nozzles and diffusers may or may not be assumed to be adiabatic. Frictional effects may sometimes be important, but usually they are neglected. However, the external work transfer is always assumed to be zero. It is also assumed that changes in thermal energy are significantly greater than changes in potential energy and therefore the latter can usually be neglected for the purpose of analysis.
The design and selection of air distribution equipment in today’s buildings presents one of the more unique challenges for mechanical designers. Unlike other mechanical equipment required for these environmental systems, the air distribution equipment selection must combine a proper choice of engineered products efficiently providing conditioned air to the space while adding architectural features which compliment the interior design. With today’s emphasis on occupant comfort, air uality and energy conservation, the proper selection of air outlets cannot be overlooked. It is the intent of this section to provide a concise approach to the proper selection of air distribution outlets. The general information is given below while the actual selection procedures of the air outlets are given in the respective technical guides.