Compressed Air Best Practices - January 2008 - (Page 24)

| 01/08 Focus Industry ENERGY MANAGEMENT | THE LOW-HANGING FR UIT IN PNEUMATIC SYSTEMS Let’s take a look at a specific example: Consider the case of a machine with a 4 inch bore cylinder and a 6 inch stroke, with a 1" diameter rod, performing work as the rod extends. Initially, system operating pressure extends and retracts the cylinder at 100 psig. The cylinder cycles 10 times per minute, operating 6 days/week, 24 hours/day. The cost of electricity to generate compressed air is $0.07 per kWh (Kilowatt hour). COST SAVINGS DUE TO USING PARKER’S REVERSE FLOW REGULATORS (ASSUMING POWER STROKE ON EXTEND) In case two, the first improvement we make will be to install a regulator in the inlet supply line and reduce the operating pressure to the application to 80 psig, both extend and retract. In case three, we install reverse flow regulators in the lines between the directional valve and the cylinder, and we reduce the retract pressure from 80 psig to 60 psig. In case four, we further reduce the retract pressure from 60 to 40 psig. In case five, using simple trial and error, we determine that Insert your values in the yellow boxes to get the annual cost Cylinder Bore Cylinder Stroke Cylinder Rod Diameter Cycles per minute (extend and retract) Number of Actuators in the Plant Extend Pressure Retract Pressure Number of Shifts in a Day (assuming 8 hour shifts) Number of Operating Days in a Week Full Cost of Electricity Annual Cost of Electricity with Normal Regulators Annual Cost of Electricity with Reverse Flow Regulators Annual Savings 4 6 1 10 1 80 40 3 6 $0.07 $/kWh (Approximately $0.05 per U.S. Department of Energy 2004, please note that this is only the cost of providing electricity to the plant and it does not take maintenance into account, in order to compensate for maintenance you can estimate around 0.09 kWh) $743.12 $487.39 $255.73 PSI PSI (for spring retract cylinders use 0) 6.44 3.72 = = Compression Factor Compression Factor Inches Inches Inches 11.78 = Eff. Area In.2 12.57 = Cylinder Area In.2 COST SAVINGS DUE TO USING PARKER'S REVERSE FLOW REGULATORS (ASSUMING POWER STROKE ON EXTEND) Insert your values in the yellow boxes to get the annual cost Cylinder Bore Cylinder Stroke Cylinder Rod Diameter Cycles per minute (extend and retract) Number of Actuators in the Plant Extend Pressure Retract Pressure Number of Shifts in a Day (assuming 8 hour shifts) Number of Operating Days in a Week Full Cost of Electricity Annual Cost of Electricity with Normal Regulators Annual Cost of Electricity with Reverse Flow Regulators Annual Savings 4 6 1 10 1 60 40 3 6 $0.07 $/kWh (Approximately $0.05 per U.S. Department of Energy 2004, please note that this is only the cost of providing electricity to the plant and it does not take maintenance into account, in order to compensate for maintenance you can estimate around 0.09 kWh) $439.63 $330.75 $108.88 PSI PSI (for spring retract cylinders use 0) 5.08 3.72 = = Compression Factor Compression Factor Inches Inches Inches 11.78 = Eff. Area In.2 12.57 = Cylinder Area In.2 24 www.airbestpractices.com http://www.airbestpractices.com

Table of Contents Feed for the Digital Edition of Compressed Air Best Practices - January 2008

Compressed Air Best Practices - January 2008 Contents Focus Industry Features Compressed Air Industry Articles From the Editor Real World Best Practices: Selecting A VSD Rotary Compressor Audit of the Month: Energy Savings in Peru The Low-Hanging Fruit in Pneumatic Systems Mikropor America, Inc. Wireless Sensor Networks: Improve Efficiency in Compressed Air Systems Special Report: The Chicago Pneumatic Compressor Launch in North America The Importance of Measuring Vacuum The Comp-Air Service Co. Special Report: The 2007 NAACD Wall Street Watch Advertiser Index Job Market

Compressed Air Best Practices - January 2008

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