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.
This feature makes the thermometer ideal for measuring the temperature of ventilation air coming through a ceiling diffuser
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.
approximately 24 St ceiling diffuser
with terminal filters including accessories etc.
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.
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
ASHRAE 2007) If a horizontal duct is attached directly to a ceiling diffuser
, either by bending flex duct or a rigid elbow, the room discharge flow velocity can be more than four times higher from one side to the other (Landsberger 2008).
These algorithms are useful for determining how a ceiling diffuser
installation will perform based on inlet configuration characteristics.
The replacement air configurations included displacement, four-way ceiling diffuser
, perforated ceiling diffuser
, and perforated perimeter supply.
For direct comparison, each type of ceiling diffuser
was installed in the same two locations and then replaced with the alternative diffuser type.