Variable Frequency Drive Savings Calculator Tools

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Presentation transcript:

Variable Frequency Drive Savings Calculator Tools Chris Guzdial March 21, 2017 NP – 00E01561

Christopher J. Guzdial, CEA BSChE – Michigan Tech University 42 years Industrial Water Treatment for Cooling Towers, Boilers and Waste Water Plants Certified Energy Auditor 14 years RETAP Analyst

What is the Tool? Calculator to determine if installing a Variable Frequency Drive is economical Identifies data needed to use the calculator

What is a Variable Frequency Drive (VFD)? Type of motor controller that drives AC electric motors Varies frequency and voltage supplied to the motor Higher frequency and voltage = higher RPMs Uses solid state electronics Reduces energy use to offset increased cost of installing VFD

Where can VFDs be Applied? Centrifugal pumps Air compressors Fan motors Cooling tower fans Air-cooled condensers Air Handling Units Miscellaneous larger motors

Conditions Where VFDs May Not Be Applicable Where a smaller, more efficient motor can replace a larger less efficient motor and may be applied to a system where the duty cycle does not vary with the load. Where a technically less costly Electrically Commutated Motor (ECM) allows for efficient motors, less than 5 horsepower can be used to operate small fans and recirculating pumps. Where a plant only occasionally requires above average flow rates used to link two pumps with one used to meet the demands of the lower flow rate and the second pump kicking in to boost pump capacity as required. The VFD may lose its economic advantage when the static head increases, such as transferring a fluid.

What Data is Needed to Use Calculator? Motor HP Motor efficiency Operating hours Electric rate ($/kWh) Motor Loading Hours of operation with flow rates (100%, 75%, 50%) NP-00E01561

Example of Savings Calculator Reference: www.pacontrol.com Refer to Handout NP-00E01561

Additional References http://www.alliantenergy.com/SaveEnergyAndMoney/TipsforSavingEnergy/CalculateEnergyUse/AE_CALC_VF_DRIVE http://www.rockwellenergycalc.com/ http://www.gozuk.com/vfd-energy-savings-calculator.html http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=11&cad=rja&uact=8&ved=0CC8QFjAAOAo&url=http%3A%2F%2Fcmua.org%2Fwpcmua%2Fwp-content%2Fuploads%2F2014%2F05%2FTRM401_energy-savings-calculator_pump-and-fan-VFD_v2_18_14.xlsx&ei=89IjVb2DGsaRsAWp9YHADQ&usg=AFQjCNGjynhOKN1cv152xbc989I7ADF0kw&sig2=YfXWFQlZZj7w0iqRz3wkpg

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