John Kramer

1. John Kramer   Duke University Medical Center Staff Engineer MPE design and troubleshooting Web site info : http:/eo.mc.duke.edu

3. Who is Green? • Is your toilet or faucet in your room leaking? • How long of a shower did you take this morning?

4. Baseline consumption data Duke Hospital and Medical Center • Total of 250 million gallons per year • About 100 sterilizers • About 125 cold rooms with water cooled condensers • About 2500 toilets • About 200 urinals • About 900 patient beds

5. Baseline consumption data Duke Hospital and Medical Center • Almost all laundry done off campus • 15,000 to 20,000 ton of HVAC cooling load • 7 million sf 100 gal per bed per day is typical for Hospitals - Includes laundry

6. Baseline consumption data Duke Hospital and Medical Center Hospital base load: • Read meters every couple of hours for 24 hours • Mid week: • 60 GPM at night • 225 GPM during the day! • MSRB- Lab- 39 flushes/fixture/day

7. Water CONSERVATION projects • Toilet and urinal retrofits- 1.6 GPF and green handles • .125 GPF urinals vs waterless and “special” inserts • 4 to 8 times more expensive to maintain • Toilet cleaning and EVS • Shower heads- caution must be used. • Getting hot water recirculating systems working • Recirulating water cooled condensers- 3 GPM per ton

8. Water CONSERVATION projects • Cycles of concentration on cooling towers • alarms for overflow; metering- consumption greater than 0.6 gpm per ton=waste • “Camel” system for water seal vacuum pumps • saves 7 gpm costs about $20k • Economizers for sterilizers- saves ½ GPM, $2000 • RO filters - tempering valve -77F-reduces waste • Post a sign in each bathroom with your number!

9. Water RECOVERY projects  • AHU condensate- a big one- espec. 100% OA units- • Rain water recovery- maybe • RO discharge • do not use brine from pretreatment softeners but carbon and sand are okay • 1 gal is wasted per gal consumed • Connect backup city water cooling systems to your condensate recovery systems- MRI, Linac, Refrigeration • Must periodically test water quality

10. Disaster planning • Disaster can strike without a drought • Develop relation with local supplier • Bottle size vs 6,000 gal tanker • Planned orderly shutdowns • Cooling Towers, etc. • Split processes from potable. • How many days before you move out? • Where will you send the patients?

11. Strength in numbers • Small changes can make a big difference • GM switches to 20W oil • takes 300k cars off the road. • Bottled water uses a lot of resources, get reusable ones. Potable water is a small number overall.

12. Water conservation at HOME • Water use at home about equal to commercial • Family of four =4,000 gallons is really good. • Shut off main valve to house when you leave and listen for inrush when you come back

13. Water conservation at HOME • Close off toilet valve overnight to check for leaks • TOTO brand very good. • Front loader washer- 25 gal vs. 40 • My family of 5 uses 3 to 5000 gal per month

14. War stories • Waterless cleaners- flammable • Turning off flush valves-sleepers • Single vs dual lever faucets • 42M gallons saved thus far, target is in the 70M range

15. Questions?