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 ?
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.
Tenders are invited for Supply, Installation, Testing And Commissioning Of Natural Draft Cooling Tower (Wooden) At Ice Plant & Cold Storage, Rangat And Cold Storage, Car Nicobar And Air Cooled Condenser For Package Unit Cold Storage At Hut Bay In The Fisheries Department.
The port is accessed by sea, river, and land in the Bay of Cartagena, on the north side of Baru Island and has a natural draft of 20 meters.
The Russian delegation, according to Lavrov, has offered a "complete and natural draft," including the cessation of violence by armed groups.
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.
They address technologies for energy conversion, virtual engineering and design, steam power plants, nuclear power plant safety, modern applications on aero-thermal engineering aspects of natural draft cooling towers, innovative cooling techniques, active cooling of turbines, design of power system compressors, advances in understanding the flow in a centrifugal compressor, and the role of thermal engineering in hybrid car systems.
It needs only minimum dredging because of the natural draft of 16 meters at berth," Achuthanandan said.
Vizhinjam has the twin advantages of having a natural draft of nearly 20 metres and of being close to the international sea route between the Gulf region and the Far East.
Dominion will construct two natural draft cooling towers for all four electricity generating units to comply with the National Pollution Discharge Elimination System (NPDES) permit.