Inlet Effects
ASHRAE Standard 70
guidelines are in place so that ideal conditions are present during GRD testing
and to ensure the testing is repeatable. It is important to note that the performance
published in the
Price catalog
is based on these ideal conditions outlined in ASHRAE 70 and that
any field modifications can affect the performance of the outlet. There are five common field conditions and their influence on the air pattern of a given diffuser:
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Topics:
GRD,
Diffusers,
ASHRAE 70,
Inlet Effect,
Grilles
Low temperature overhead air distribution (also called cold air distribution) supplies cooling air to the occupied space with an entering air temperature typically between 40°F and 50°F [4.4 and 10°C]. This contrasts to the “typical or conventional” overhead air distribution cooling supply air temperature between 50°F and 59°F [10 and 15°C].
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Topics:
GRD,
Beams,
Cooling Coil,
Psychrometrics,
Low Temperature
Water condensation is easily the most common concern when discussing chilled beams and cooling panels. This concern comes from the personal experience many have had of seeing water droplets form on the surface of piping such as a water coil.
Figure 1: Water droplets form on the surface of piping of a water coil
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Topics:
Beams,
Cooling Coil,
Condensate,
Psychrometrics,
Low Temperature
ACTIVE CHILLED BEAMS
In a chilled beam, the term “induction” is used to describe the process of injecting primary air under pressure through a nozzle, which in turn entrains return or plenum air at the discharge of the nozzle.
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Topics:
Diffusers,
Beams,
System Efficiency,
Induction,
Heat Transfer
In the HVAC design world, there is some uncertainty about the application of new and existing air distribution technologies since codes change so quickly and sometimes drastically. Customer mock-ups of the proposed HVAC design for a specific space are a great way to help resolve design uncertainty.
Atlanta’s In-Situ Acoustical Test Chamber
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Topics:
Noise Control,
GRD,
Diffusers,
Terminals,
Fan Coils,
Beams,
Displacement,
Underfloor,
Controls,
Mock-Up
