Energy Efficiency in Hospitals

Rob van Heur ([email protected])

Marcel Didden ([email protected])

LABORELEC

Energy efficiency in hospitals

From innovation to operational assistance

www.leonardo-energy.org www.laborelec.com

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Content

1.1. IntroductionIntroduction

2.2. HVACHVAC

3.3. Compressed airCompressed air

4.4. SteamSteam

5.5. LightingLighting

6.6. CogenerationCogeneration

7.7. SummarySummary


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IntroductionIntroduction


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Who is Laborelec ?

Technical competence center and laboratory within GdFSuez• Métier = Electrical Power

– Power generation / T&D / energy end-use

• 230 researchers and technical specialists– Growing +15%/year

Applied research and technical assistance• Turnover 38 MEUR

– Strong growth International

• For shareholders and third party customers– 20% of turnover outside GdFSUEZ

• Innovation for Value Creation• Focused on Sustainable Energy Technology


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HospitalHospital EnergyEnergy balancebalance

Heating43%

Hot water5%

Lighting21%

Cooling5%

Kitchen4%

Other22%


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BenchmarkingBenchmarking hospitalshospitalsBased on m2, beds or overnight staysCannot be compared without interpretation

Level of outsourcing : kitchen / laundryHospital type : academic, regionalConstruction yearDefinition of m2 : parking deckDefinition of beds

Heat ElectricityEnergy consumption per m² 262 MWh/m2/year 113 MWh/m2/year Energy consumption per bed 25 235 MWh/m2/year 10 944 MWh/m2/year


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Heating, VentilationHeating, VentilationAir conditioningAir conditioning


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HVAC GeneralHVAC General

50% of the energy consumptionMost applied energy saving measures

Fitting frequency controllers on the fansRecovering heat from the extraction airOptimising the running hoursOptimising the temperature and humidity


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Case Study : Ventilation in polyclinicCase Study : Ventilation in polyclinic

Current situationCurrent situationVentilation 24/7, operation only at office hours

ProposalProposalReduce to 50% outside office hours

SavingsSavings1200 euro annually

Investment / Payback timeInvestment / Payback timeNo investment


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• Period of reduced setting : 9 h/day

• Electricity consumption saving (ventilator fans) : 10 MWhe

• Degree hours on basis of 17°C : 21 577 hK/a

• Gas consumption saving (heating) : 7.6 MWhth

• Number of humidification gram-hours : 1 437 h/a*g/kg

• Assumed efficiently of steam generation + transport : 90 %

• Gas consumption saving (steam) : 5.1 MWhth/year

Case Study : Ventilation in polyclinicCase Study : Ventilation in polyclinic


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Compressed airCompressed air


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CompressedCompressed air Generalair GeneralTwo functions

MedicalLegal requirements from EN-12021E.g. redundancy of equipment

TechnicalComparable to industry


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Case Study : Splitting up networksCase Study : Splitting up networks

Current situationCurrent situationTechnical and medical combined

ProposalProposalSeparate both functions, install VSD

SavingsSavings7 200 euro annually

Investment / Payback timeInvestment / Payback time44 000 euro (payback time : 5.5 years)


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Case Case StudyStudy : Split : Split compressedcompressed air networksair networks

• Annual consumption of technical compressed air : 820 000 Nm3/year• Specific energy consumption at 11 bar : 0.158 kWh/Nm3

• Specific energy consumption at 6 bar : 0.107 kWh/Nm3

• Energy saving achieved by lowering the pressure : 42 MWh/year

• Zero-load energy consumption with respect to total consumption : 25 %• Consumption savings for 11 bar network at zero load : 5.5 MWh/year• Consumption savings for 6 bar network at zero load : 21.5 MWh/year• Total energy saving achieved by frequency regulation : 27 MWh/year

• Total energy consumption for compressed air : 152 MWh/year• Energy consumption of absorption air drying, as a percentage of

the total compressed air energy consumption: 25 %

• Energy consumption of standard air drying, as a percentage of the total compressed air energy consumption

: 5 %

• Present energy consumption for drying : 30.5 MWh/year• New energy consumption for drying of the 11 bar network : 5.6 MWh/year• New energy consumption for drying of the 6 bar network : 4.4 MWh/year• Energy saving : 20.5 MWh/year

Lowering the pressure of the technical compressed air:

Installing compressors with frequency regulation:

Savings on compressed air treatment:


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SteamSteam


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SteamSteam GeneralGeneral

Economiser Air Preheater Condensor

Steam to degasser

Feed WaterMake-up water

Preheated air

Bleed

Losses

Air

Steam from boiler Net steam

Condensate return

Economiser Air Preheater Condensor

Steam to degasser

Feed WaterMake-up water

Preheated air

Bleed

Losses

Air

Steam from boiler Net steam

Condensate return


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Case Study : Directly fired hot tap waterCase Study : Directly fired hot tap water

Current situationCurrent situationHot tap water by steam

ProposalProposalHeat it directly

SavingsSavings2340 euro annually

Investment / Payback timeInvestment / Payback time10 500 euro, payback time 4.5 years


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The savings are determined as follows:

•Hot water consumption : 100 m3/week

•Hot water temperature : 70 °C

•Water supply temperature : 10 °C

•Estimated efficiency of steam circuit (boiler + transport) : 81%

•Present energy consumption per year for hot water : 450 MWh/year

•Efficiency of directly fired condensing boiler : 98 %

•Energy savings per year : 78 MWh/year

Case Study : Directly fired hot tap waterCase Study : Directly fired hot tap water


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LightingLighting


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0 20 40 60 80 100

electr.

11W conv.

electr.

18W conv.

electr.

36W conv.

electr.

58W conv.

Lamp consumption

Ballast consumption

LightingLighting GeneralGeneral


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Case Study : Replacing conventional Case Study : Replacing conventional balastsbalasts

Current situationCurrent situationConventional ballast

ProposalProposalReplace by electronic ballasts

SavingsSavings37 000 euro

Investment / Payback timeInvestment / Payback timePayback time : 6-9 years


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Case Case StudyStudy LightingLighting

• Total energy consumption of the lighting : 2 400 MWh/year• Power consumed by fluorescent tube lighting (90%) : 2 160 MWh/year• Losses in conventional ballasts : 20 %• Percentage of light sources with conventional ballasts : 70 %• Estimated number of fluorescent light sources with

conventional ballasts, on the basis of 58 W per tube: 4 000

• Total energy consumption of conventional fluorescent lights

: 1 780 MWh/year

• Potential savings by fitting electronic ballasts and efficient optics

: 26 %

• Total savings potential : 462 MWh/year


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CogenerationCogeneration


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Cogeneration GeneralCogeneration GeneralContinuous demand of heat

SterilisationHumidificationHot tap water

Integrated in Backup power systemApplication in Hospitals

Try to avoid cogeneration for electrical peakshavingCogen/absorption cooling is not always interesting

Annual profile

13,5

0%

12,4

0%

11,2

0%

9,00

%

6,10

%

4,50

%

3,60

%

3,60

%

4,90

% 7,50

% 10,8

0%

12,9

0%

0,00%2,00%4,00%6,00%8,00%

10,00%12,00%14,00%16,00%18,00%20,00%

Janu

ary

Febr

uary

Mar

ch

Apr

il

May

June

July

Aug

ust

Sep

tem

ber

Oct

ober

Nov

embe

r

Dec

embe

r


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-- Other saving measuresOther saving measures-- SummarySummary


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Other efficiency gainsOther efficiency gains

Small operational measuresSmall operational measuresVariable Speed DrivesVariable Speed DrivesIsolationIsolation

Use of surgery tools : electrical or with compressed Use of surgery tools : electrical or with compressed airairSterilisation : electrical or with steamSterilisation : electrical or with steamHumidification : electrical or notHumidification : electrical or notLooking within the value chainLooking within the value chain

Suppliers of electric materialSuppliers of electric materialEfficiency of emergency systemEfficiency of emergency system


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SummarySummaryEnergy efficiency in existing hospitalsEnergy efficiency in existing hospitals

Good housekeepingGood housekeepingOperational and low cost modificationsOperational and low cost modifications

22--5% reduction5% reductionReplacement (lamps, heat recovery) : payback time > 5 yearsReplacement (lamps, heat recovery) : payback time > 5 yearsFurther within the value chainFurther within the value chain

New hospitalsNew hospitalsUse best practicesUse best practices

Heat recoveryHeat recoveryEnergy efficient lightingEnergy efficient lighting

Rob van Heur ([email protected])

Marcel Didden ([email protected])

LABORELEC

From innovation to operational assistance

Energy Efficiency in Hospitals

Technology

Transcript of Energy Efficiency in Hospitals