The return air grilles, return air ducts to the air handling unit (AHU), the interior surfaces of the AHU, mixing box
, coil compartment, condensate drain pans, humidifiers and dehumidifiers, supply air ducts, fans, fan housing, fan blades, air wash systems, spray eliminators, turning vanes, filters, filter housings, reheat coils, and supply diffusers are all considered part of the HVAC system.
damper testing." ASHRAE Transactions 104(2):1226.
As shown in Table 1, an example of mixing box
(dampers) illustrates the typical categories in a component module setup.
Then the effect of heating/cooling systems is removed from the DAT, and the performance of the mixing box
is evaluated by analyzing its functionality effect on the filtered DAT.
The PmxC[O.sub.2] was measured using a fast mixing box
and side-stream capnography, avoiding the complex cross-multiplication and integration of in-line flow and PetC[O.sub.2] measurements required in other software.
Of the burglary in April last year, she said that someone forced the door of the victim's room in the house while he was out and stole his DJ mixing decks and mixing box
APAR also successfully identified several occurrences of faults with the mixing box
Once we even designed our own twin shaft mixing box
and suspended it from a Cat dozer."
Each zone has its own upstream and downstream air flows; ambient air is drawn through heat exchangers and mixed in a specially-designed mixing box
. It is then passed through the fries, which are carried on a plate belt.
Pure argon was admitted at a constant rate from a mass controlled source (tylan FC 260 USA) into the mixing box
in order to calculate the respiratory volume |5~.
It will also be equipped with a mixing box
to operate either in fresh air or in return air.
For example, measurements of the supply air-flow rate from air handling units (AHUs), the outdoor air-flow rate into air handlers, the temperature of the mixed-air leaving the AHU mixing box
, and the chilled water flow rate through cooling coils are usually not available or not accurate enough for HVAC control and fault detection.