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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


Questions

Questions?


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