{ x = nStr.split('. { { Second: atmosphere cubic foot per minute (atm cfm) is unit of power. If we need a higher pressure, say 125 psi, this rule of thumb doesn’t work anymore – we will need more HP to compressed to 125 psi with the same output. So we must create a higher pressure at the compressor, to account for the pressure drop. } document.getElementById('bhp').focus(); x1 = x1.replace(rgx, '$1' + ',' + '$2'); "); document.getElementById('cost').focus(); document.getElementById('net_profit').value = addCommas(document.getElementById('net_profit').value); else } How much water is generated in a compressed air system depends mainly on the relative humidity and temperature of the ambient air. } else x1 = x1.replace(rgx, '$1' + ',' + '$2'); V = Ventilating Air (m3/min), (cfm) H = Heat Radiation i. KW = CFM x Temp. In other words, per HP, the compressor output will be smaller at 125 psi. alert('Please enter some value for hour'); else var ME = document.getElementById('me_val').value; 42 Industrial Dr, Keyport, NJ 07735. document.getElementById('hour').focus(); document.getElementById('cost').focus(); nStr += ''; Divide the Volume by 7.48 and you will get the volume (V) in cubic foot (1 cubic foot = 7.48 gallons). alert('Please enter some value for hour'); document.getElementById('energy_cost').value = addCommas(document.getElementById('energy_cost').value); Ft. = 7.48 gallons. A bigger air receiver is ALWAYS better than a smaller one. 5 kilowatts to atmosphere cubic feet … Pressure drop, every compressed air system worst enemy! document.getElementById('bhp').focus(); return false; if (!RE_NUM.test(bhp)) { Combined brake horsepower rating of operating air compressors, ME: 0.96 0.95 0.94 0.93 0.92 0.91 0.90 0.85, www.epa.gov/cleanenergy/energy-resources/refs.html, Lontra Signs Agreement with IAC to Begin U.S. Distribution, Schulz Opens New Office in the United States, Atlas Copco Specialty Rental's Compressors Comply with EPA and Save on Stack Testing, Emerson Introduces AVENTICS Series AF2 Flow Sensor Monitor. alert('Please enter some value for cost'); In both equations, you can substitute your information to see what you actually pay to make compressed air each year at your facility. } { while (rgx.test(x1)) { If we convert this rule of thumb to SI units, we get something like: For every 1 kW power, a compressor delivers 2.5 to 3.2l/s. return false; document.getElementById('net_profit').value = round_up(document.getElementById('energy_cost').value / 0.08); But if you forget the CFM level and lose the manual for some reason, here is a practical way to calculate CFM. document.getElementById('bhp').focus(); return false; } . CFM refers to Cubic Feet per Minute, which measures the volume of air that is coming out of an air compressor each minute.