energy efficiency in hospitals
DESCRIPTION
Hospitals represent 6% of the total energy consumption in the utility buildings sector. The webinar analyses the use of energy, benchmark methodologies and the potential energy savings in the hospital sector, on the basis of theory and practical case studies.TRANSCRIPT
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Rob van Heur ([email protected])
Marcel Didden ([email protected])
LABORELEC
Energy efficiency in hospitals
From innovation to operational assistance
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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
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Rob van Heur ([email protected])
Marcel Didden ([email protected])
LABORELEC
From innovation to operational assistance