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091203 Replacing Old Energy Guzzlers Makes Perfect Business Sense Presentation

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2009 Canada National Green Building Conference: Improved technology in water pumps reduces energy consumption, water wastage, water contamination and the energy bill. Now that fewer new building …

2009 Canada National Green Building Conference: Improved technology in water pumps reduces energy consumption, water wastage, water contamination and the energy bill. Now that fewer new building projects are being launched, it makes perfect sense for installers to shift their focus to replacing old pumps.

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  • 1. Metro Toronto Convention Centre Toronto, Ontario National GreenBuilding Conference Replacing Old Energy Guzzlers Makes Perfect Business Sense: Greening Strategies for Older Buildings Simon Feddema Greg Towsley, LEED AP 03 December 2009
  • 2. Preview • Energy consumption in commercial buildings • Opportunities for energy reduction – The pumping system – The right pump – Proper operation – Maintaining the pump – Continuous monitoring • Case story • Questions
  • 3. Commercial Building Energy Consumption by End Use 4% Refrigeration 7% Lighting 51% Other Non-Substitutables 8% 72% Other Substitutables Space Heating 14% 9% Water Heating 7% Air Conditioning Pumps ICF International (2008). “Policy Options for Energy Efficiency in Canada’s Commercial Pumps Buildings: Final Report”. Prepared for the NRTEE, August 15, p.8 involved in involved in 72%! 72%!
  • 4. Opportunities for energy reduction in new and existing commercial buildings
  • 5. The Pumping System • Space heating System knowledge • Air conditioning • Water heating means getting the right • Domestic pressure boosting • Waste water removal system design Cooling tower Heat recovery Fan coils M Cooling ceiling M M M M Pressure holding Cooling surface Primary M Chiller pump Secondary Buffer pumps tank
  • 6. System characteristics
  • 7. System Performance Curve System Performance Curve Friction Loss Pressure Required Head Net Elevation Change Pump Flow Rate
  • 8. Load profile of circulation systems
  • 9. The Right Pump Initial Costs Installation and Energy Commissioning Costs Costs Operating Costs Downtime Maintenance Costs Costs Environmental Costs Decommissioning / Disposal Costs
  • 10. Proper operation System flow/pump speed Constant / constant Variable / constant Variable / variable Variable / variable
  • 11. Maintaining the pump (or 10 ways to kill your pump) • Over work it • Stab it • Starve it • Break its limbs • Choke it • Shake it to pieces • Fry it • Drown it • Poison it • Neglect regular check-ups
  • 12. Maintaining the pump (or 10 ways to kill your pump) • Over work it • Stab it • Starve it • Break its limbs • Choke it • Shake it to pieces • Fry it • Drown it • Poison it • Neglect regular check-ups
  • 13. Continuous monitoring
  • 14. Case Story
  • 15. Toronto East General Hospital • Responsible environmental management program – Improve energy efficiency – Improve water efficiency • Pressure boosting for domestic water main part of hospital • Domestic water booster pump system – Three pumps: one (1) 20 hp, two (2) 40 hp – All constant speed – 20 hp continuous operation – “brake” to control – “High” maintenance costs – No flow – by-pass to drain – Unknown flow profile – Unknown water waste – Exact energy consumption unknown
  • 16. Consumption Profile • Assume 84,500,000 gallons per year • Assume maximum flow in any day – 515 gpm • Pump TDH – 135 ft. (58 psi) • Following have been estimated for simplicity……
  • 17. 1: 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 00 AM 2: 00 AM 3: 00 AM 4: 00 AM 5: 00 AM 6: 00 AM 7: 00 AM 8: 00 AM 9: 00 AM 10 :0 0 AM 11 :0 0 12 AM :0 0 N oo n 1: 00 PM 2: 00 PM Consumpton Profile 3: 00 PM 4: 00 PM 5: 00 PM 6: 00 PM 7: 00 PM Consumption Profile 8: 00 PM 9: 00 P 10 M :0 0 P 11 M :0 0 PM 12 :0 0 AM
  • 18. Load Profile 100% 90% % of Max GPM # of hrs/day Percent of maximum flow 80% 100% 515 1 70% 75% 386 2 50% 258 3 60% 25% 129 8 50% 15% 77 10 40% 30% 20% 10% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Hours per day
  • 19. Existing Pumps • Design point: – 515 gpm at 135 feet TDH – 58 psi pump pressure boost • Pump follows 135 ft. performance curve • Anything above 135 ft. is wasted energy 515 gpm
  • 20. Existing Pumps % of # of Total # of Hp @ kW @ kWh @ Cost @ Point Max GPM hrs/day Hours Pumps Point Point Point ($0.10/kWh) 100% 515 1 365 1 23.60 17.60 6,423 $ 642.35 75% 386 2 730 1 21.20 15.81 11,540 $ 1,154.05 50% 258 3 1,095 1 16.73 12.48 13,661 $ 1,366.07 25% 129 8 2,920 1 13.48 10.05 29,352 $ 2,935.19 15% 77 10 3,650 1 11.60 8.65 31,573 $ 3,157.29 8,760 92,550 $ 9,254.95
  • 21. New Packaged Pump System • Sized for the needs of the hospital – not oversized • Three (3) 15 hp pumps • All pumps controlled with pressure sensors and variable speed drives – Slow the pump down to meet the flow and head requirements – Not braking – No waste of energy
  • 22. New Packaged Pump System @ 135 ft. TDH • Three (3) equally sized pumps 515 • Speed controlled by variable frequency drives • Able to meet system head conditions at reduced speed, thus reduce hp/kWh
  • 23. New Packaged Pump System % of # of Total # of Hp @ kW @ kWh @ Cost @ Point Max GPM hrs/day Hours Pumps Point Point Point ($0.10/kWh) 100% 515 1 365 3 23.40 17.45 6,369 $ 636.90 75% 386 2 730 3 17.55 13.09 9,554 $ 955.35 50% 258 3 1,095 2 11.58 8.64 9,456 $ 945.55 25% 129 8 2,920 1 5.79 4.32 12,607 $ 1,260.74 15% 77 10 3,650 1 4.10 3.06 11,159 $ 1,115.94 8,760 49,145 $ 4,914.49 kWh Energy Cost of Consumption Operation Old System 92,550 $ 9,254.95 New System 49,145 $ 4,914.49 SAVINGS 43,405 $ 4,340.46
  • 24. New Packaged Pump System ADDITIONAL BENEFIT • After installation of new system: 515 – Booster system ran at less than 50% speed for >1.5 hours – Flow was approximately 80 gpm at 40 feet TDH – Less water demand, lower pressure loss • Pressure monitoring in the control system turned pumps off when there was no water demand
  • 25. New Packaged Pump System ACTUAL SYSTEM CURVE % of # of Total # of Hp @ kW @ kWh @ Cost @ Point Max GPM hrs/day Hours Pumps Point Point Point ($0.10/kWh) 100% 515 1 365 3 23.40 17.45 6,369 $ 636.90 75% 386 2 730 3 12.36 9.22 6,728 $ 672.83 50% 258 3 1,095 2 5.64 4.21 4,605 $ 460.53 25% 129 8 2,920 1 1.95 1.45 4,246 $ 424.60 15% 77 10 3,650 1 1.26 0.94 3,429 $ 342.95 8,760 25,378 $ 2,537.81 kWh Energy Cost of Consumption Operation Old System 92,550 $ 9,254.95 New System Curve 25,378 $ 2,537.81 SAVINGS 67,172 $ 6,717.14
  • 26. Summary • To reduce energy consumption in existing systems: – Know your system – design, components, requirements. – How is the pump operating within the system? – If the system is changed, consider installing the right pump – impeller trim, different size or design. – Is there a better way to operate the pump – combination, variable speed, modifications? – Maintain the pumps in the best conditions possible. – Continually monitor how the pump is doing – maintenance costs, energy costs. – Consider all of the alternatives.
  • 27. Questions? GRUNDFOS Canada Inc. 2941 Brighton Road Oakville, Ontario L6H 6C9, Canada Phone: (905) 829-9533 Fax: (905) 829-9512 http://www.grundfos.ca

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