Chimney Air Flow Rate

Includes 53 different calculations.

Chimney air flow rate.

Air velocity distance traveled per unit of time is usually expressed in linear feet per minute lfm. The same problem occurs if your house is located at the base of a mountain. Q 3 7 m s 3 14 0 2 m 2 4 0 12 m 3 s. Online calculator to quickly determine air flow rate through an orifice.

The height that structure e g. 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. Flow of air in pipes equation and calculator.

That these equations can be used for dry air not for mass flow and energy loss calculations where air humidity may have vast effects. 350 cfm per ton of cooling capacity is required for high latent heat hvac applications. 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. Finally sometimes air actually blows down the chimney but less frequently than you d guess it s usually something else.

The greater the thermal difference and the height of the. Measured across the cooling coil typical a c air flow is about 400 to 450 cfm per ton of cooling capacity. Hydraulic pneumatics fluids design and engineering data. Air flowing down your chimney.

By multiplying air velocity by the cross section area of a duct you can determine the air volume flowing past a. Natural draft chart imperial and metric units pdf. Boiler heat load and chimney area boiler capacity and chimney area. Air flow conversion calculator.

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. Flow of air in pipes equation and calculator. The result is either a positive or negative buoyancy force. The air flow can be calculated as.

Equations displayed for easy reference. 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. 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. Chimney influences its ability to transfer flue gases to the external environment via stack effect.

The higher pressure outside the chimney is the driving force that moves the required combustion air. Air velocity is measurement of the rate of displacement of air or gas at a specific location.