The horsepower required to adiabatic compression of air can be calculated with the calculator below: N - number of stages. Here is a sample problem that we will use to work through the steps needed to select a compressor and accessories. Sponsored Links . From the conservation of energy, the compressor work per mass of airflow CW is equal to the change in the specific enthalpy ht of the flow from the entrance to the exit of the compressor. We know 1 cubic foot is equal to 7.48 gallons. Phone: 216/241-7333 Fax: 216/241-0105 E-mail: cagi@cagi.org ©2012 CAGI Example- An air compressor bears a sticker where they claim the air compressor has 4 Horsepower (HP), tank capacity 30 gallons, 14 CFM at 90 psi. There’s a simple relation between BAR and PSI: 1 bar equals 14.5038 psi. P is = 2.31*(k/(k-1))*(T dis-T suct)/M*Q m. A compression is said isentropic when it is carried out by an ideal compressor, without friction, without internal leakage and while being perfectly insulated. Let’s work backwards with our formula and see what we get. To calculate power, we need adiabatic efficiency (Ea). We can calculate the CFM. Formula : compressor power calculation. Simply convert between BAR and PSI using this calculator. Work must be done to turn the shaft on which the compressor is mounted. You will need to record the psig (pounds per square inch) at two separate times in the refill process: once at the moment the compressor kicks in and once at the moment the compressor kicks out. Example: 15 HP Compressor with a 132 Gallon Tank rated for 125 PSI and 54.9 CFM. Adiabatic efficiency is function of type of compressor, rpm, volumetric flow, and adiabatic head. Reciprocating compressor capacity calculation formula. Let’s see. Miami: 7292 NW 25th St Doral, FL 33122 Monday – Friday 7:30 AM - 4:30 PM So just multiply or divide by 14.5038 to convert between BAR and PSI. From the data above, adiabatic head (Had) is 74,808.54 ft.lbf/lbm. CW = ht3 - ht2 The term "specific" means per mass of airflow. We calculate 30/ 7.48 = 4.01 cubic feet. In a reciprocating compressor, the capacity depends on the volume displaced by the piston during its movement. To calculate adiabatic head and power we use equation below. page 10 COMPRESSOR … The air compressor cfm psi calculator formula is: CFM = Tank Volume in Cubic Feet x Standard Pressure (ATM) during a cycle x Cranks per Minute. At first, we convert the tank capacity gallons to cubic feet. Adiabatic head and centrifugal compressor power calculation. 1. Online air compressor horsepower calculator . For 1 compressor stage, the isentropic compression is the following :. Record the amount of time that it takes to refill the tank while paying close attention to the compressor's tank gauge. Compressed Air & Gas Institute 1300 Sumner Avenue Cleveland, OH 44115 . ... 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