air damper


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damper

butterfly damper, 1
damper, 1
1. A device used to vary the volume of air passing through an air outlet, inlet, or duct; it does not significantly affect the shape of the delivery pattern.
2. A pivoted cast-iron plate at fireplace throat, i.e., between fireplace and smoke chamber, to regulate draft.
3. Same as fireplace damper.
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References in periodicals archive ?
When the unit is in economizer mode, the relief air damper is fully open and the coil path return damper is fully closed, such that all of the air traversing the cooling coil is outdoor air.
3]/s (cfm) R = relief air damper control signal for BPP and BPA damper controls S = path resistance factor [omega] = relative fan speed based on design speed [theta] = damper blade position (1 for fully open and 0 for fully closed) Subscripts d = design EF = exhaust air fan ex = exhaust air (path) inf = envelope infiltration (path) MA = mixed air plenum (node) oa = outdoor air (path) OAD = outdoor air damper ra = return air (path) RCD = recirculating air damper RE = relief or return air plenum (node) rec = recirculating air (path) rel = relief air (path) RF = return air fan RLD = relief air damper RM = room air or space (node) sa = supply air (path) SF = supply air fan TB = terminal box
2] signal to control and modulate the position of outdoor air damper and thereby provides the space with the proper amount of ventilation air.
Now both residential and commercial designers can preserve the finished look of drywall while providing quick and easy access to air dampers, plumbing, vents, electrical wiring, and the like.
recirculation air damper stuck open, stuck closed, stuck 50% open
The model air damper was separated into inflow and outflow areas, since gas moves through the air damper in two directions: fresh air enters from the outside (inflow) and combustion gases leave the furnace (outflow).
The total system pressure, excluding the outdoor air damper, is expressed in Equation 3:
Figure 1 shows the mixed air and room air temperature signals, sent from a sensors superblock (SB5) to a controls superblock (SB1), result in positioning of the heating and cooling coil valves and outdoor air damper.
We release the lockout once the outdoor air dampers are effectively at 100% open and the supply air setpoint is not met, allowing the cooling coil to provide supplemental cooling.
Modulate the return air damper off the supply air temperature loop in sequence with the mechanical cooling per standard economizer control logic.
The table lines up significant AHU parameters (OAT, outside air damper, return air damper, fan speed, setpoints, etc.
Tenders are invited for Work of hot air gate, Hot air damper, Cold air gate, Cold air damper repair, Servicing seal replacement, Gear box overhauling of coal mill xrp-763 unit 3,4&5 at ntps, Eklahare.