natural draft

natural draft

[′nach·rəl ′draft]
(fluid mechanics)
Unforced gas flow through a chimney or vertical duct, directly related to chimney height and the temperature difference between the ascending gases and the atmosphere, and not dependent upon the use of fans or other mechanical devices.

natural draft

The flow of gases in a chimney due to the difference in temperature and density between the gases within the chimney and the outside air.
References in periodicals archive ?
Limited Tenders are invited for Invitation To Bid For Conducting Eia And Ra Study For Proposed Installation Of Gtg Cum Hrsg At Panipat Bathinda Nangal Along With Installation Of New Natural Draft Prilling Tower At Bathinda Panipa
I wanted the cleanest burning, most efficient natural draft pizza and bread oven," he said.
SPIG's product offering includes air-cooled (dry cooling) systems, mechanical draft wet cooling towers and natural draft wet cooling hyperbolic towers.
1FM, Flat Rate Home Services has donated a 40 gallon, gas residential natural draft Bradford White water heater that will be available on the radio station's 'Get My Perks' page.
The air flow due to natural draft was calculated by omitting losses due to duct wall friction and the resulting estimated velocity was 588 in/s (15 m/s) from equation 1 [8].
WingFan is a helpful option for applications where adequate natural draft is not available.
The Russian delegation, according to Lavrov, has offered a "complete and natural draft," including the cessation of violence by armed groups.
In a natural draft chimney, like the one at Manzanares, the draft at the bottom is proportional to the difference in temperature between the rising warm air and the surrounding cooler ambient air, as well as to the height of the chimney.
Engineering/site services of charge heater Tender no: ST11101300 Description: The scope of work includes: (A) Design and engineering of new convection section process coils; (B) Design and engineering of new flue gas duct from the convection section to the existing stack; (C) Design and engineering of new natural draft Low-NOx burners including any heater floor modifications and the burners' predicted performance; (D) Computational Fluid Dynamics analysis for the new burners and the radiant section at design case; (E) Design and engineering of new recommended instrumentation associated with the revamp work; (F) Design of new internal insulation (castables) with stainless steel anchors; (G) Design of any structural changes including painting and others.
Parameters and their variations are as follows: chimney construction with 1 or 3 exterior sides exposed, with a clay tile liner or an unlined double-brick chimney, an outdoor ambient "1,000-hour" outdoor temperature corresponding to Department of Energy (DOE) Region IV or V (26[degrees]F or 13[degrees]F, -3[degrees]C or -11[degrees]C), and a 78% steady state efficiency (SSE) natural draft or 83% SSE fan-assisted boiler.
Passing gas through the boiler is made by natural draft, forced draft and draft copies aspiring balanced.
As a sustained effort towards promotion of eco-friendly industrial operations, the new assembly shop is equipped with natural draft air ventilators on the roof.