Chimney Air Flow Rate

350 cfm per ton of cooling capacity is required for high latent heat hvac applications.

Chimney air flow rate.

Air flow conversion calculator. Flow of air in pipes equation and calculator. The height that structure e g. Boiler heat load and chimney area boiler capacity and chimney area.

The result is either a positive or negative buoyancy force. V velocity of air in feet per second ft sec p loss of pressure due to flow through the pipes in ounces per square inch ounces in 2. Natural draft chart si and imperial units. The structure which provides ventilation for hot flue gases or smoke from a boiler stove furnace or fireplace to the outside atmosphere causes a flow rate.

Equations displayed for easy reference. The greater the thermal difference and the height of the. Flow of air in pipes equation and calculator. Q 3 7 m s 3 14 0 2 m 2 4 0 12 m 3 s.

The higher pressure outside the chimney is the driving force that moves the required combustion air. Includes 53 different calculations. Natural draft chart imperial and metric units pdf. Typical air flow rates in cfm vary depending on the type of cooling system.

Chimney influences its ability to transfer flue gases to the external environment via stack effect. Online calculator to quickly determine air flow rate through an orifice. Air velocity is measurement of the rate of displacement of air or gas at a specific location. Hydraulic pneumatics fluids design and engineering data.

The same problem occurs if your house is located at the base of a mountain. The air flow can be calculated as. Air flow and velocity due to natural draft air flow volume and velocity due to stack or flue effect caused by indoor hot and outdoor cold temperature difference. But maybe your chimney is short and next to a larger part of the house or a bigger building.

Stack effect or chimney effect is the movement of air into and out of buildings chimneys flue gas stacks or other containers resulting from air buoyancy buoyancy occurs due to a difference in indoor to outdoor air density resulting from temperature and moisture differences. Combustion boiler house topics fuels like oil gas coal wood chimneys safety valves tanks combustion efficiency. In a natural draft chimney the maximum flow rate you can obtain is only due to the contribution of buoyancy which is given as q c x a x sqrt 2 x g x h x ti to ti where constant c is. By multiplying air velocity by the cross section area of a duct you can determine the air volume flowing past a.

Air velocity distance traveled per unit of time is usually expressed in linear feet per minute lfm. Air flowing down your chimney.