} Main components of centrifugal compressor are Casing, Shaft, Impellers, Bearings, Diaphragms and Seals. Weight flow-lb/min, lb/h (kg/min. document.getElementById('bhp').focus(); { The power required for adiabatic (process without transfer of heat) compression of air can be expressed as. x1 = x1.replace(rgx, '$1' + ',' + '$2'); } Power P, kW {P1*100000*Q1*ln (P2/P1)}/1000 ISOTHERMAL COMPRESSION IS FOR ACADEMIC PURPOSE ONLY. Let’s start with an example while I show you step-by-step of the calculation method. } document.getElementById('hour').focus(); if(cost == "") RECIPROCATING COMPRESSOR IX. II. 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. Pump Power Calculator in imperial Units/SI Units. The kW output of your compressor motor is divided by the electrical efficiency to give the electrical input power that your compressor uses. } if(hour == "") Learn About Lewis Systems Energy Audit Today! alert("Please enter numeric values only. if (!RE_NUM.test(cost)) { document.getElementById('metric_ton').value = round_up(document.getElementById('energy_user').value * 0.000718); { Motor power is measured in kW. document.getElementById('energy_cost').value = addCommas(document.getElementById('energy_cost').value); The refrigeration capacity of a compressor is the product of the evaporator enthalpy rise and the compressor mass flow rate. For the 200 cfm load: Specific power of the VSD at 41% load (200/488) from Figure 5 = 20.2 kW/100 cfm. Table 3 shows the inlet volumetric flow rates required to achieve 350 ton of cooling. return x1 + x2; return x1 + x2; In instances when only the amperage rating is given, determine watts used by multiplying the voltage by the number of amps. { Find Your Compressor. Lastly, the pressure washer manual indicates it needs 15.0 Amps max and 5.4 Amps continuous. document.getElementById('metric_ton').value = round_up(document.getElementById('energy_user').value * 0.000718); One metric horsepower is equal to 0.73549875 kilowatts: 1 hp(M) = 735.49875 W = 0.73549875 kW. This calculator will help you determine your power requirements, as well as how many compression stages you will need for your process conditions. AC three phase amps to kilowatts calculation Calculation with line to line voltage var RE_NUM = /^[0-9. Brake horse power, BHP = GHP/ηM (kW) (1) } Horsepower Calculator The following calculation method uses the Gas Processors Suppliers Association Engineering Data Book Eleventh Edition, FPS Version, 1998, eq 13-4 developed for large slow speed (300-450 RPM) compressors with SG = 0.65 and having CR > 2.50. document.getElementById('hour').focus(); SCFM-60°F. } x1 = x1.replace(rgx, '$1' + ',' + '$2'); alert("Please enter numeric values only. 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 14.7 psia and dry 3. number of mols/h None of these flows can be used directly in calculating compressor performance. alert('Please enter some value for cost'); PSI VS. return false; document.getElementById('net_profit').value = round_up(document.getElementById('energy_cost').value / 0.08); x2 = x.length > 1 ? A plant once found that its two 150-hp rotary-screw compressors couldn’t maintain the required minimum pressure (Figure 1). CheCalc Chemical engineering calculations to assist process, plant operation and maintenance engineers. // -->. // -->