Chimney Air Flow Rate

Flow of air in pipes equation and calculator.

Chimney air flow rate.

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. Q 3 7 m s 3 14 0 2 m 2 4 0 12 m 3 s. Boiler heat load and chimney area boiler capacity and chimney area. Includes 53 different calculations.

The height that structure e g. The result is either a positive or negative buoyancy force. Natural draft chart imperial and metric units pdf. Online calculator to quickly determine air flow rate through an orifice.

Flow of air in pipes equation and calculator. Equations displayed for easy reference. The greater the thermal difference and the height of the. Natural draft chart si and imperial units.

Finally sometimes air actually blows down the chimney but less frequently than you d guess it s usually something else. 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. Air flowing down your chimney. Combustion boiler house topics fuels like oil gas coal wood chimneys safety valves tanks combustion efficiency.

Measured across the cooling coil typical a c air flow is about 400 to 450 cfm per ton of cooling capacity. Air velocity is measurement of the rate of displacement of air or gas at a specific location. That these equations can be used for dry air not for mass flow and energy loss calculations where air humidity may have vast effects. The air flow can be calculated as.

But maybe your chimney is short and next to a larger part of the house or a bigger building. Typical air flow rates in cfm vary depending on the type of cooling system. The higher pressure outside the chimney is the driving force that moves the required combustion air. Air flow conversion calculator.

Air velocity distance traveled per unit of time is usually expressed in linear feet per minute lfm. Chimney influences its ability to transfer flue gases to the external environment via stack effect. 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. 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.

350 cfm per ton of cooling capacity is required for high latent heat hvac applications. By multiplying air velocity by the cross section area of a duct you can determine the air volume flowing past a.