As described in the 2009 ASHRAE Handbook--Fundamentals, (18) the airflow pattern in cooling mode from a flush-mounted ceiling diffuser
is projected downward to the floor and follows it, producing a stagnant region near the ceiling.
The supply air entering in the room from the ceiling diffuser
flows straight downward behind the operator and exits from the two returns located on the opposite side walls of the room.
A typical TDD consists of three parts (Figure 1): a collector located on the roof to gather daylight; a hollow tubular light guide in the plenum/attic space to channel the collected daylight to its intended destination; and a ceiling diffuser
to spread the daylight indoors.
The company also offers an 'air supply' version of the product that can be installed on the ceiling or wall, instead of a ceiling diffuser
or a wall grill.
You'll see a clear-bubble dome on the roof that gathers natural light and transfers it down a highly polished round pipe taking it around tricky twists and turns, to a ceiling diffuser
panel that is the proverbial "light at the end of the tunnel.
This feature makes the thermometer ideal for measuring the temperature of ventilation air coming through a ceiling diffuser
The supply air entering the cleanroom from the ceiling diffuser
flows straight down behind the operator and exits from the two returns located on the opposite side walls of the room.
Different ceiling diffusers
arrangements were already predicted, Khalil et al (2013) that showed the various effects of ceiling diffuser
design, shape and location.
Three sets of experiments were conducted: natural convection experiments, radial square ceiling diffuser
experiments and high-sidewall diffuser experiments.
A jet of air delivered by a ceiling diffuser
is typically affected by buoyancy and can be described through this simple equation: The throw to 75 fpm (0.
Averaging the measured discharge velocity on all four sides of a square ceiling diffuser
is a minimum requirement, but is probably not a perfect measurement technique.
Second, the Standard 70 testing using the optimized plenum, where the baseline data for the output measures (throw, sound, and pressure data) were recorded and analyzed for each type of ceiling diffuser