Compressed Air Best Practices - February 2009 - (Page 31) Focus Industry POWER PLANTS | 02/09 | Step #1: Gather Data To begin an effective Demand Control project, some data needs to be gathered. First, you will need to know the Tariff Rate Schedule. This can be achieved from your utility bill, local utility representative or it is often posted on the utility websites. From this table, we can see that though the cost of electricity is $0.102/kWh, the energy cost portion is between $0.082 and $0.066 depending on the time of day the energy is used. Also, the demand portion of the energy cost is $12.00/kW. This is the part we will focus on for this project. Figure 1: Tariff Table Step #2: Understand the Demand Charge A demand charge of $12.00/kW means that the utility company measures the electricity usage every 15 minutes for the whole month. The peak energy use of the month is called the demand and is multiplied by the $12.00 to determine the demand charge. A demand profile, as shown in figure 2, shows the 15 minute electric readings in the form of a graph. From this graph, we can see the peak demand was 1,720 kW. This data is usually available directly from the utility company. Some utilities will give you access to see this type of detailed data from your computer at no charge and others with a small charge per month. 1,720 kW x $12.00 per kW = $20,640. The total electric bill was $76,512. The demand cost was 27% of the total cost! Every kW that we can reduce from this peak is worth $12.00 for each month or $144.00 per year. Looking closely at the graph we can see that the peak occurs mid day and lasts approximately 1.5 hours. If we could reduce this peak to a maximum of 1,600 kW, we could reduce our demand by 120 kW. 120 kW x $12.00/kW x 12 months per year = $17,280 per year. This is almost 2% of our total electric spend. Figure 2: Interval Data www.airbestpractices.com 31 http://www.airbestpractices.com
Table of Contents Feed for the Digital Edition of Compressed Air Best Practices - February 2009 Compressed Air Best Practices - February 2009 Contents From the Editor Utility-Air News Compressed Air Audit of the Month Air Standards Instrument Air in Nuclear Power Plants Seven Sustainability Projects for Industrial Energy Savings The Pneumatic Advantage Personal Productivity Resources for Energy Engineers Wall Street Watch Advertiser Index Classifieds Compressed Air Best Practices - February 2009 Compressed Air Best Practices - February 2009 - (Page Intro) Compressed Air Best Practices - February 2009 - Compressed Air Best Practices - February 2009 (Page Cover1) Compressed Air Best Practices - February 2009 - Compressed Air Best Practices - February 2009 (Page Cover2) Compressed Air Best Practices - February 2009 - Compressed Air Best Practices - February 2009 (Page 3) Compressed Air Best Practices - February 2009 - Contents (Page 4) Compressed Air Best Practices - February 2009 - From the Editor (Page 5) Compressed Air Best Practices - February 2009 - Utility-Air News (Page 6) Compressed Air Best Practices - February 2009 - Utility-Air News (Page 7) Compressed Air Best Practices - February 2009 - Utility-Air News (Page 8) Compressed Air Best Practices - February 2009 - Utility-Air News (Page 9) Compressed Air Best Practices - February 2009 - Compressed Air Audit of the Month (Page 10) Compressed Air Best Practices - February 2009 - Compressed Air Audit of the Month (Page 11) Compressed Air Best Practices - February 2009 - Compressed Air Audit of the Month (Page 12) Compressed Air Best Practices - February 2009 - Compressed Air Audit of the Month (Page 13) Compressed Air Best Practices - February 2009 - Compressed Air Audit of the Month (Page 14) Compressed Air Best Practices - February 2009 - Compressed Air Audit of the Month (Page 15) Compressed Air Best Practices - February 2009 - Compressed Air Audit of the Month (Page 16) Compressed Air Best Practices - February 2009 - Compressed Air Audit of the Month (Page 17) Compressed Air Best Practices - February 2009 - Air Standards (Page 18) Compressed Air Best Practices - February 2009 - Air Standards (Page 19) Compressed Air Best Practices - February 2009 - Air Standards (Page 20) Compressed Air Best Practices - February 2009 - Air Standards (Page 21) Compressed Air Best Practices - February 2009 - Instrument Air in Nuclear Power Plants (Page 22) Compressed Air Best Practices - February 2009 - Instrument Air in Nuclear Power Plants (Page 23) Compressed Air Best Practices - February 2009 - Instrument Air in Nuclear Power Plants (Page 24) Compressed Air Best Practices - February 2009 - Instrument Air in Nuclear Power Plants (Page 25) Compressed Air Best Practices - February 2009 - Instrument Air in Nuclear Power Plants (Page 26) Compressed Air Best Practices - February 2009 - Instrument Air in Nuclear Power Plants (Page 27) Compressed Air Best Practices - February 2009 - Instrument Air in Nuclear Power Plants (Page 28) Compressed Air Best Practices - February 2009 - Instrument Air in Nuclear Power Plants (Page 29) Compressed Air Best Practices - February 2009 - Seven Sustainability Projects for Industrial Energy Savings (Page 30) Compressed Air Best Practices - February 2009 - Seven Sustainability Projects for Industrial Energy Savings (Page 31) Compressed Air Best Practices - February 2009 - Seven Sustainability Projects for Industrial Energy Savings (Page 32) Compressed Air Best Practices - February 2009 - Seven Sustainability Projects for Industrial Energy Savings (Page 33) Compressed Air Best Practices - February 2009 - The Pneumatic Advantage (Page 34) Compressed Air Best Practices - February 2009 - The Pneumatic Advantage (Page 35) Compressed Air Best Practices - February 2009 - The Pneumatic Advantage (Page 36) Compressed Air Best Practices - February 2009 - The Pneumatic Advantage (Page 37) Compressed Air Best Practices - February 2009 - The Pneumatic Advantage (Page 38) Compressed Air Best Practices - February 2009 - Personal Productivity (Page 39) Compressed Air Best Practices - February 2009 - Personal Productivity (Page 40) Compressed Air Best Practices - February 2009 - Personal Productivity (Page 41) Compressed Air Best Practices - February 2009 - Resources for Energy Engineers (Page 42) Compressed Air Best Practices - February 2009 - Resources for Energy Engineers (Page 43) Compressed Air Best Practices - February 2009 - Resources for Energy Engineers (Page 44) Compressed Air Best Practices - February 2009 - Resources for Energy Engineers (Page 45) Compressed Air Best Practices - February 2009 - Wall Street Watch (Page 46) Compressed Air Best Practices - February 2009 - Wall Street Watch (Page 47) Compressed Air Best Practices - February 2009 - Wall Street Watch (Page 48) Compressed Air Best Practices - February 2009 - Advertiser Index (Page 49) Compressed Air Best Practices - February 2009 - Classifieds (Page 50) Compressed Air Best Practices - February 2009 - Classifieds (Page Cover3) Compressed Air Best Practices - February 2009 - Classifieds (Page Cover4)
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