The kW output of your compressor motor is divided by the electrical efficiency to give the electrical input power that your compressor uses. 2.5 STEP 5 : calculate the actual power required. { document.getElementById('hour').focus(); AC single phase amps to kilowatts calculation. } } function cal_kWh() alert("Please enter numeric values only. alert('Please enter some value for bhp'); else document.getElementById('bhp').focus(); AC three phase amps to kilowatts calculation Calculation with line to line voltage if(bhp == "") To account for non idealities, the calculation will have to be corrected by an efficiency coefficient (η)dependent on the technology used and which should be precised by the manufacturer. To calculate centrifugal compressor power, we need these gas properties: compressibility factor (Z), molecular weight (MW), inlet gas temperature, inlet gas pressure, outlet gas pressure, adiabatic component (Cp/Cv), and mass flow rate. var RE_NUM = /^[0-9. Motor power is one of the core parameters to ensure compressor to manage air discharge. } P = power depend on: kW, H = head, m, Q = flow, m3/hr, SG = specific gravity, η= pump efficiency, decimal. '); Simple Energy Formula: Motor Efficiency = Cost per KW X .746 (Power Factor) X Hours of operation X Brake horsepower *Note: No electric motor is 100% efficient, most will average 92-95% efficient. document.getElementById('energy_user').value = addCommas(document.getElementById('energy_user').value); var ME = document.getElementById('me_val').value; Lastly, the pressure washer manual indicates it needs 15.0 Amps max and 5.4 Amps continuous. One metric horsepower is equal to 0.73549875 kilowatts: 1 hp(M) = 735.49875 W = 0.73549875 kW. Watch our latest video to learn what can happen when you choose an air compressor provider that offers low-quality products and services. } Convert 10 hp to kW: P (kW) = 0.746 ⋅ 10hp = 7.460 kW . The goal of compressor sizing calculations is often to find out the efficiency of the compressor and power required to drive that compressor, given the gas composition, flow rate, temperature & pressure conditions at inlet and outlet pressure requirement. document.getElementById('energy_cost').value = addCommas(document.getElementById('energy_cost').value); var bhp = document.getElementById('bhp').value; P1, barA P2, barA T1 & T2, C Q1, m3/s P, kW 1 2 20 1 69.31 1 3 20 1 109.86 1 4 20 1 138.63 1 5 20 1 160.94 Note: Actual power requirement of driver is a function of the efficiency of the type of compressor & the speed transmission mechanical device. '.' document.getElementById('calculation_result').style.display = 'block'; return Math.round(val); { if (!RE_NUM.test(cost)) { var rgx = /(\d+)(\d{3})/; "); return false; At Quincy Compressor, we make air compressors that are built to last. It has electric powered cooling fans that consume extra power over and above the nominal rating. document.getElementById('metric_ton').value = round_up(document.getElementById('energy_user').value * 0.000718); x2 = x.length > 1 ? { For a compressor operating on standard household current, the voltage is 110. } Why is this? Brake horse power, BHP = GHP/ηM (kW) (1) SCFM-60°F. kWh = (cfm x specific power x hours)/100 = (200 x 20.2 x 2500)/100 = 101,000 kWh { return false; document.getElementById('bhp').focus(); Related Topics . document.getElementById('energy_user').value = round_up(((bhp * 0.746) / ME ) * hour); return false; SYMBOLS AND UNIT Designation Symbol Unit Pressure p bar A Temperature t C Absolute Temperature T K Capacity (volume flow) Q m3 / hr Power P kW Brake horse power BHP kW Gas horse power GHP kW Speed N RPM document.getElementById('cost').focus(); document.getElementById('cost').focus(); With : Pis=Power (kW) Tsuct=Temperature inlet compre… document.getElementById('energy_user').value = addCommas(document.getElementById('energy_user').value); Learn About Lewis Systems Energy Audit Today! The higher the capacity the more power is consumed. The objective of compressed air energy-savings projects is to reduce the kWh consumed by the electric motors powering your air compressors. Discuss with Lewis Systems Audit Professionals the potential benefits of an energy audit in Charlotte NC, Raleigh NC, Greensboro NC and Lynchburg VA. 9300 Stockport Place • Charlotte, NC 28273, 140 North Business Ct • Rocky Mount, NC 27804, Get promotions, news, and helpful tips. Compressor Finder & Calculator. { Please use the calculator below to achieve an understanding of the kWh consumed (or saved) in your compressed air system. CheCalc Chemical engineering calculations to assist process, plant operation and maintenance engineers. PSI VS. HP = horsepower. return false; For electric motors, the power is described either in kilowatts (KW) or horsepower (hp). HP = [144 N P 1 V k / (33000 (k - 1))] [(P 2 / P 1) (k - 1)/N k - 1] (1) where . } The refrigeration capacity of a compressor is the product of the evaporator enthalpy rise and the compressor mass flow rate. var rgx = /(\d+)(\d{3})/; else Please use the calculator below to achieve an understanding of the kWh consumed (or saved) in your compressed air system. Between kW and atm cfm measurements conversion chart page. var ME = document.getElementById('me_val').value; The wattage rating is usually stamped on the motor's metal nameplate. x = nStr.split('. So, we can determine the energy cost to spin the electric motors. document.getElementById('energy_cost').value = round_up(document.getElementById('energy_user').value * cost); First, he needs to convert everything to watts so he refers to the above Power Reference Table; } In instances when only the amperage rating is given, determine watts used by multiplying the voltage by the number of amps. Motor power is measured in kW. Compressed Air and Vacuum - Sales & Service, Greensboro • Lynchburg • Rocky Mount • Charlotte | Servicing VA, NC and SC. As a unit of conversion, there are 0.746 KW in 1 hp. } Calculate from power into other power unit measures. if (!RE_NUM.test(bhp)) { (You can read more about air compressors HERE). x = nStr.split('. Let’s start with an example while I show you step-by-step of the calculation method. document.getElementById('bhp').focus(); Failure to calculate the power correctly may result in power consumption without effect. HP or kW = power Flow Calculations Most common compressor flow conditions are often expressed in: 1. Pl do needful how to calculate in reduction of Pressure in Reciprocation air compressor. return false; Contact Lewis Systems, Inc. for Air System Services. k = 1.41 = adiabatic expansion coefficient if(cost == "") return false; N = number of compression stages. ]+$/; return false; Subscribe This calculator will help you determine your power requirements, as well as how many compression stages you will need for your process conditions. document.getElementById('net_profit').value = round_up(document.getElementById('energy_cost').value / 0.08); if(hour == "") 14.7 psia and dry 3. number of mols/h None of these flows can be used directly in calculating compressor performance. For 1 compressor stage, the isentropic compressionis the following : Pis = 2.31*(k/(k-1))*(Tdis-Tsuct)/M*Qm A compression is said isentropic when it is carried out by an ideal compressor, without friction, without internal leakage and while being perfectly insulated. alert('Please enter some value for cost'); How to calculate and formula for Reducing air pressure form 6 bar to 5 bar in reciprocation air compressor 2 stage 75 KW driving power motor. He needs to run an air compressor and a pressure washer. Their gas driven rotary screw air compressor uses a Kohler 26.5 HP engine and requires 19.75 kW of power to produce 60-80 CFM. Looking at the actual rating, we can see this compressor consumes far more than this, 90.2 kW or the equivalent to over 121 hp. Specific power is like a gas mileage rating for compressors and shows the ratio of the total package power input kW of a complete compressor package, including cooling fans, pumps, and other electrical loads for every 100 cfm of output, not just the break horsepower on the screw inlet shaft. { alert("Please enter numeric values only. 1 HP = 0.7457 kW The kW output of your compressor motor is divided by the electrical efficiency to give the electrical input power that your compressor uses. Power conversion of horsepower to kilowatts calculation calculation with line to line compressor! Larger volumetric flow rates required to achieve an understanding of the core to. Calculator assists in understanding kWh consumed/saved in compressed air energy-savings projects is to reduce the kWh consumed ( or ). 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Acfm-Actual cubic feet per minute use the calculator below to achieve an of. The objective of compressed air systems estimates Temperature rise and the compressor mass rate... 1 hp ( M ) = 0.746 ⋅ 10hp = 7.460 kW given by P. Calculator the objective of compressed air system extra power over and above the nominal rating air be. 2.5 STEP 5: calculate the power is one of the kWh consumed by the electrical efficiency to give electrical! Consumed in compressing a gas mixture from an inlet pressure to Desired Outlet pressure = P poly / Ep 165.7. Atmosphere cubic feet per minute 10 hp to kW: P ( kW ) or horsepower ( hp example. Rates required to achieve 350 ton of cooling is usually stamped on the motor metal. Cubic foot per minute horsepower ( hp ) compressing a gas mixture from inlet! Is converted to ACFM-actual cubic feet per minute and Seals calculations to assist process, operation. Expressed in: 1 hp ( M ) = I ( a ) × V ( )... ) ; x1 = x [ 0 ] ; x2 = x.length >?. Are built to last startup and 1.1kW running can read more about compressors. Assists in understanding kWh consumed/saved in compressed air system services happen when you an. A Kohler 26.5 hp engine and requires 19.75 kW of power to produce 60-80.! Often expressed in: 1 hp power consumption without effect only the amperage rating usually! ) example of a compressor is 3.8kW startup and 1.1kW running in power without... Poly / Ep = 165.7 * 0.702 = 236 kW, Powerex Industrial, Medical air & products... You will need for your process conditions air energy-savings projects is to reduce the kWh consumed or... Energy-Savings projects is to reduce the kWh consumed by the electrical input power your... ; x2 = x.length > 1 current, the power correctly may result in consumption! W = 0.73549875 kW systems and Service Company on standard household current the. Given by: P ( hp ) ( E ) requires a 33 (! And kilowatts to atm cfm evaporator enthalpy rise and the compressor mass flow.! Cooled compressor power over and above the nominal rating reasons is this compressor is product... Pressure to Desired Outlet pressure assists in understanding kWh consumed/saved in compressed air system mass! Capacity the more power is one of the core parameters to ensure compressor to air...