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CFM = btu / (1.08 * tRise) For reference: 1 kw/hr = 3412.14 btu. assume we have a 15kw heater and a tRise of 22. 15kw * 3412.14 = 51182.12 btu. now we can solve for CFM. 51182.12 / (1.08 * 22) = 2154. In that example our result is 2,154 CFM. If that conflicts with a suspected figure An investigation is required.
First we use M for thousands and MM for million. Secondly the gas turbine engine test report from the manufacture shows the fuel flow value at full load is 37.01 mmBTU/HR while the gas composition is as under. Methane=94.4199. Eathane=1.0500.
to convert BTU per hour to cfh cubic feet per hour you just drop the 3 zero off the btu total and that will give you the CFH. Bti is an energy measurement and CFH is a volume measurement. Ex Total BTU is 900,000 btu the CFH is 900. use the total cfh, the type of pipe, the reg pressure, the longest run and the IFGC pipe sizing chart and your are ...
So 315 cfm is 18900 ft³/h, or approximately 1463 lb/h air. Air has a heat capacity of 0.24 BTU/lb/°F and you are heating it 50 degrees. 1463 lb/h x 50°F x 0.24 BTU/lb/°F = 17600 BTU/h just for heating the flowing air. I've ignored losses through the walls of the room. 20 000 BTU/h might barely suffice or might be a bit light.
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The Dept of Energy gives "typical" values of 983 BTU/ft³ LHV, 1089 BTU/ft³ HHV. You should get figures from your own gas supplier. 11.85 MMBTU/h divided by 983 BTU/ft³ is 12053 ft³/h. Natural gas is more commonly specified as hundreds (CCF) or thousand (MCF) of cubic feet, so 120.53 CCF/h or 12.053 MCF/h.
02-08-2007, 10:46 PM. Re: conversion m3/hr to kg/hr for (lpg) gas. The density of LPG at 15° C and pressure of 1 bar is about 500 to 510 kg/m 3, I will use 505 kg/m 3 in my formula for you. m3/hour * 505 kg/m 3 = kg/hour. Flag.
SCFM to kW. 06-27-2007, 01:07 PM. I'm trying to convert SCFM to kW for compressed air. Specificallly, I've got two values, 5.5 SCFM and 12 CFM for equipment in a manufacturing line that I'm trying to convert to power (kW, mj/h, or BTU/h). I know that the units operate at 90 psi and I'm assuming SCFM and CFM can be used interchangably.
Use ideal gas law to convert cfm flow rate to pounds per minute of exhaust. The heat capacity of air is 24% that of water, roughly 0.24 BTU/(lb·°F), where the temperature difference between room air and the flue gas is used. Multiply by pounds per minute of exhaust and temperature difference of the exhaust gas.
For example: 1 BTU is the heat required to raise 1 lb of water 1ºF. Gasoline has a BTU rating of 18,400 BTUs/lb, whereas ethanol is actually 47% less @ 9,750 BTUs/lb. Because of this, ethanol fuel suppliers display their fuel BTU ratings as BTUs per gallon (giving the consumer a perceived higher heat value).