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John Kramer  . Duke University Medical Center Staff Engineer MPE design and troubleshooting Web site info : http:/eo.mc.duke.edu. Who is Green ?. Is your toilet or faucet in your room leaking? How long of a shower did you take this morning?. Baseline consumption data.

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john kramer

John Kramer  

Duke University Medical Center

Staff Engineer

MPE design and troubleshooting

Web site info : http:/eo.mc.duke.edu

who is green
Who is Green?
  • Is your toilet or faucet in your room leaking?
  • How long of a shower did you take this morning?
baseline consumption data
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
baseline consumption data1
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

baseline consumption data2
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
water conservation projects
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
water conservation projects1
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!
water recovery projects
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
disaster planning
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?
strength in numbers
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.
water conservation at home
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
water conservation at home1
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
war stories
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

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