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 dataDuke Hospital and Medical CenterTotal of 250 million gallons per

yearAbout 100 sterilizersAbout 125 cold rooms with

water cooled condensersAbout 2500 toiletsAbout 200 urinalsAbout 900 patient beds

Baseline consumption dataDuke Hospital and Medical CenterAlmost all laundry done off campus15,000 to 20,000 ton of HVAC

cooling load7 million sf

100 gal per bed per day is typical for Hospitals - Includes laundry

Baseline consumption dataDuke Hospital and Medical

CenterHospital base load: Read meters every couple

of hours for 24 hoursMid week:

60 GPM at night225 GPM during the day!MSRB- Lab- 39

flushes/fixture/day

Water CONSERVATION projectsToilet and urinal retrofits- 1.6 GPF and green

handles.125 GPF urinals vs waterless and “special”

inserts4 to 8 times more expensive to maintain

Toilet cleaning and EVSShower heads- caution must be used.Getting hot water recirculating systems workingRecirulating water cooled condensers- 3 GPM

per ton

Water CONSERVATION projectsCycles of concentration on cooling towers

alarms for overflow; metering- consumption greater than 0.6 gpm per ton=waste

“Camel” system for water seal vacuum pumpssaves 7 gpm costs about $20k

Economizers for sterilizers- saves ½ GPM, $2000RO filters - tempering valve -77F-reduces wastePost a sign in each bathroom with your number!

Water RECOVERY projects AHU condensate- a big one- espec. 100% OA units-

Rain water recovery- maybeRO discharge

do not use brine from pretreatment softeners but carbon and sand are okay

1 gal is wasted per gal consumedConnect backup city water cooling systems to your

condensate recovery systems- MRI, Linac, Refrigeration

Must periodically test water quality

Disaster planning Disaster can strike without a

droughtDevelop relation with local supplierBottle size vs 6,000 gal tankerPlanned orderly shutdowns

Cooling Towers, etc. Split processes from potable.

How many days before you move out?

Where will you send the patients?

Strength in numbersSmall changes can make a big differenceGM 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 HOMEWater use at home about

equal to commercialFamily 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 HOMEClose off toilet valve

overnight to check for leaksTOTO brand very good.

Front loader washer- 25 gal vs. 40

My family of 5 uses 3 to 5000 gal per month

War storiesWaterless cleaners- flammableTurning off flush valves-sleepersSingle vs dual lever faucets42M gallons saved thus far, targetis in the 70M range