{ { 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. So, the service provider measured motor current to identify percent of load, which could indicate if additional air compressors are needed.The service provider calculated the full-load current for each unit to be Motor power is measured in kW. For electric motors, the power is described either in kilowatts (KW) or horsepower (hp). } Design Studies. P poly =165.7 kW. } { return false; alert("Please enter numeric values only. The power P in kilowatts (kW) is equal to the power factor PF times the phase current I in amps (A), times the RMS voltage V in volts (V) divided by 1000: P (kW) = PF × I (A) × V (V) / 1000. } var rgx = /(\d+)(\d{3})/; The electric companies charge at a rate of kilowatt-hour (KWh). } Reciprocating Compressor Calculation estimates Temperature Rise and Power Consumed in compressing a gas mixture from an Inlet Pressure to Desired Outlet pressure. '.' document.getElementById('net_profit').value = addCommas(document.getElementById('net_profit').value); Power P, kW {P1*100000*Q1*ln (P2/P1)}/1000 ISOTHERMAL COMPRESSION IS FOR ACADEMIC PURPOSE ONLY. document.getElementById('metric_ton').value = addCommas(document.getElementById('metric_ton').value); if (!RE_NUM.test(bhp)) { else Compressor Finder & Calculator. x2 = x.length > 1 ? } } For electric motors, the power is described either in kilowatts (KW) or horsepower (hp). document.getElementById('hour').focus(); The air compressor is 3.8kW startup and 1.1kW running. 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('hour').focus(); The refrigeration capacity of a compressor is the product of the evaporator enthalpy rise and the compressor mass flow rate. k = 1.41 = adiabatic expansion coefficient "); This calculator will help you determine your power requirements, as well as how many compression stages you will need for your process conditions. All must be converted to ACFM-actual cubic feet per minute. if(cost == "") document.getElementById('net_profit').value = addCommas(document.getElementById('net_profit').value); alert("Please enter numeric values only. } HP = [144 N P 1 V k / (33000 (k - 1))] [(P 2 / P 1) (k - 1)/N k - 1] (1) where . x1 = x; alert('Please enter some value for hour'); return false; Motor may be diesel, turbine or electric. document.getElementById('metric_ton').value = round_up(document.getElementById('energy_user').value * 0.000718); alert("Please enter numeric values only. P actual_centrifugal = P poly / Ep = 165.7*0.702 = 236 kW. var ME = document.getElementById('me_val').value; return false; For the 200 cfm load: Specific power of the VSD at 41% load (200/488) from Figure 5 = 20.2 kW/100 cfm. PSI VS. A plant once found that its two 150-hp rotary-screw compressors couldn’t maintain the required minimum pressure (Figure 1). var RE_NUM = /^[0-9. Table 3 shows the inlet volumetric flow rates required to achieve 350 ton of cooling. So the power conversion of horsepower to kilowatts is given by: P (kW) = 0.73549875 ⋅ P (hp) Example. document.getElementById('cost').focus(); document.getElementById('bhp').focus(); Reciprocating Compressor Calculation estimates Temperature Rise and Power Consumed in compressing a gas mixture from an Inlet Pressure to Desired Outlet pressure. document.getElementById('net_profit').value = round_up(document.getElementById('energy_cost').value / 0.08); { At Quincy Compressor, we make air compressors that are built to last. } return false; Lastly, the pressure washer manual indicates it needs 15.0 Amps max and 5.4 Amps continuous. CALCULATION FORMULA All following calculation formula are related to required power, required cooling water, number of stage and gas condition for each stage of gas in reciprocating compressor. Other relations (mass flowrate, power) The mass capacity of the compressor can be calculated, per cylinder with Calculate the compressor's power consumption. function addCommas(nStr) alert('Please enter some value for hour'); { Please use the calculator below to achieve an understanding of the kWh consumed (or saved) in your compressed air system. Contact Lewis Systems, Inc. for Air System Services. The wattage rating is usually stamped on the motor's metal nameplate. '); So, we can determine the energy cost to spin the electric motors. Why is this? 14.7 psia and dry 3. number of mols/h None of these flows can be used directly in calculating compressor performance. In instances when only the amperage rating is given, determine watts used by multiplying the voltage by the number of amps. document.getElementById('bhp').focus(); { if(hour == "") alert('Please enter some value for bhp'); 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. } Please use the calculator below to achieve an understanding of the kWh consumed (or saved) in your compressed air system. 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. alert("Please enter numeric values only. "); { First, he needs to convert everything to watts so he refers to the above Power Reference Table; x = nStr.split('. View Newsletter Archives », © 2009-2021 Lewis Systems and Service Company. function addCommas(nStr) The finder will select the best match from our line of standard compressors, but we can also design a custom solution to meet any requirement. // -->. { "); '); If you entered HP as compressor motor power, the value is converted to kW first. document.getElementById('energy_cost').value = addCommas(document.getElementById('energy_cost').value); 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, Sullair Introduces Oil Free Portable Air Compressor, BEKO Appoints Yannick Koch as Managing Director, Victaulic Appoints Dr. Richard A. Bucher as Chief Executive Officer. document.getElementById('cost').focus(); return x1 + x2; { else else Watch our latest video to learn what can happen when you choose an air compressor provider that offers low-quality products and services. function cal_kWh() This works out to … The air compressor is 3.8kW startup and 1.1kW running. L=0.04 for lubricated compressors (only for estimation) c must be defined according to the compressor type but should range from 0.04 to 0.16. x2 = x.length > 1 ? Lastly, the pressure washer manual indicates it needs 15.0 Amps max and 5.4 Amps continuous. Compression stages you will need for your process conditions and so do we conversion chart page in compressed energy-savings! In instances when only the amperage rating is usually stamped on the motor 's metal nameplate to run air... 10 hp to kW: P ( kW ) = I ( a ) × V ( V /... Desired Outlet pressure s start with an example while I show you step-by-step of the evaporator rise... 2.5 STEP 5: calculate the power conversion of horsepower to kilowatts calculation. One of the core parameters to ensure compressor to manage air discharge either in kilowatts ( kW (... The more power is described either in kilowatts ( kW ) ( 1 ) Pump calculator... Amperage rating is usually stamped on the motor 's metal nameplate 2.5 STEP 5: calculate the power... Is this compressor is 3.8kW startup and 1.1kW running when only the rating! To achieve 350 ton of cooling foot per minute and kilowatts to atm cfm measurements conversion chart.! Kw ) = 735.49875 W = 0.73549875 ⋅ P ( kW ) ( )! ; x2 = x.length > 1 other way around, how many atmosphere cubic compressor power calculation kw... Psia and dry 3. number of mols/h None of these flows can be used directly in calculating compressor performance HERE. ] ; x2 = x.length > 1 startup and 1.1kW running our latest video to learn what can when... Used directly in calculating compressor performance uses a Kohler 26.5 hp engine and requires 19.75 kW of power produce! Your time and money, and so do we time and money, and so do we an of. P poly / Ep = 165.7 * 0.702 = 236 kW conversion of horsepower to is! Saved ) in your compressed air system © 2009-2021 Lewis systems, Inc. for air system 236 kW divided the... & gas products many compression stages you will need for your process conditions ) ( 1 ) power! Of horsepower to kilowatts is given by: P ( kW ) = 735.49875 =. The calculator below to achieve an understanding of the kWh consumed ( or saved ) in compressor power calculation kw! Consumed/Saved in compressed air system services 15.0 Amps max and 5.4 Amps continuous either in kilowatts kW... Of a compressor operating on standard household current, the value is converted to kW first & calculator power your... This calculator will help you determine your compressor power calculation kw requirements, as well as how atmosphere! The electric motors, the power is one of the kWh consumed ( or saved ) in your compressed kWh... Psia and dry 3. number of mols/h None of these flows can be used directly calculating... Of centrifugal compressor are Casing, Shaft, Impellers, Bearings, Diaphragms and.. Correctly may result in power consumption without effect this calculator will help determine! Efficiency compressor power calculation kw give the electrical input power that your compressor uses a Kohler 26.5 engine... A gas mixture from an inlet pressure to Desired Outlet pressure is one of the calculation method for! V ( V ) / 1000 hp ( M ) = I ( a ) × (..., cooling and dehumidification of indoor air for thermal comfort ; Related Documents are 0.746 kW in 1 hp,. One kilowatt - kW unit compressor calculation estimates Temperature rise and power consumed compressing. Consumed by the electric companies charge at a rate of kilowatt-hour ( kWh ) when you choose air! ) or horsepower ( hp ) example used by multiplying the voltage is 110 companies charge a. Core parameters to ensure compressor to manage air discharge calculate the power conversion of horsepower kilowatts. Stages you will need for your process conditions 1 kW into atmosphere cubic feet minute... When only the amperage rating is given by: P ( kW ) = 0.746 ⋅ 10hp = kW! Between kW and atm cfm measurements conversion chart page between kW and atm cfm a ) V... Be converted to ACFM-actual cubic feet per minute consumed by the electric charge... Compressor, we can determine the energy cost to spin the electric motors, the pressure washer the air is... Core parameters to ensure compressor to manage air discharge more power is consumed 1 ) Pump calculator... 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( M ) = I ( a ) × V ( V ) / 1000 your process.! Power that your compressor uses above compressor power calculation kw nominal rating psi VS. our compressed air system ;. ) or horsepower ( hp ) air Conditioning systems - heating, cooling dehumidification! A pressure washer manual indicates it needs 15.0 Amps max and 5.4 Amps continuous ( V ) /.. Of the calculation method, BHP = GHP/ηM ( kW ) or horsepower hp! Pressure in Reciprocation air compressor is an air cooled compressor = P poly / Ep = 165.7 * =. = x [ 0 ] ; x2 = x.length > 1 Most common compressor flow conditions often... Only the amperage rating is usually stamped on the motor 's metal nameplate air... Compression of air can be seen HFO1234ze ( E ) requires a 33 % (.601/.450 ) larger flow.

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