Post on 25-Feb-2016
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KaHo Sint-Lieven - Retro-commissioning for social-profit organisation 1
Alexis Versele - Dries HubrechtsKaHo Sint-Lieven – 18 jan. 2008
Retro-commissioning to improving building energy efficiency for social-profit organisation.
KaHo Sint-Lieven - Retro-commissioning for social-profit organisation 2
Outline
• Existing building• Objectives• Methodology• Results• Conclusions
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Existing buildings
• Social-profit organisation: integration of young immigrants • Urban environment district of Antwerp: Oud Borgerhout • Brick buildings built around 1930:
– surface 650m² split up over four floors
KaHo Sint-Lieven - Retro-commissioning for social-profit organisation 4
Existing buildings
• Functioning organisation– secretary rooms, – educational and – sports rooms– housekeeper
Sports secretary
Sports rooms
General secretary
Rooms to let
Party room
Youth club Youth parties
Party loft
Office
Office
Office Office
Office
Workingroom
Sta
ircas
e
Sta
ircas
e
Section AA
Sports secretarySection PP
Kameleon+ apartments
Backyard building
Housekeeper
KaHo Sint-Lieven - Retro-commissioning for social-profit organisation 5
Objectives
• Improve energy efficiency of buildings • Cost effective
– Social profit organisation– 3 Step business plan
• Improve comfort if possible
KaHo Sint-Lieven - Retro-commissioning for social-profit organisation 6
Methodology – Cx teamListing of problems
- Investigation staff and building users- recent energy bills
Analysis of building energy performance- watt-hour meter for appliances- EPB.
- Dialux Professional for lighting
Recalculation of energy consumption- Natural Gas consumption for heating- The energy usage lighting and electric appliances
Measures to improve energy performance and comfort - EPB as benchmark- Return on investment .
Business plan- 3 Step plan - Grants
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Problems
• Energy consumption– Financial
• Natural gas: 21-03-06 to 20-03-07: 9554 euro = 325 kWh/m²a• Electricity: 21-03-06 to 20-03-07: 2447 euro = 35 kWh/m²a
– Ecological and social impact– Comfort
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Energy bills
0%10%20%30%40%50%60%70%80%90%
100%
aardgasverbruik2005
volume gebruiksoppervlakte
Achterbouw verdiepen
Achterbouw gelijkvloers enportierswoning
Kameleon
2002 2003 2004 2005 2006verdiepen achterbouw 45492 46865 41809 52067gelijkvloers achterbouwen portierswoningkameleon 19271 7588 9179 9420 5680totaal kWh 250687 246485 249162 274071 257537
192032185924 198174 251857212584
• Natural Gas consumption
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Analysis of building energy performance
• Project– Part of the buildings
• Back yard building• Housekeeper• Different heating- and ventilation zones
Sports rooms
Rooms to let
Party room
Youth club Youth parties
Party loft
Sta
ircas
e
Sports secretary General secretary OfficeWorking
room
Office
Office Office
Office
Sta
ircas
e
KaHo Sint-Lieven - Retro-commissioning for social-profit organisation 10
Analysis of building energy performanceU-values
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Analysis of building energy performance• Heating and cooling
– Central heating• Condensing gas heater • Control system
– thermostatic control valves – room thermostats– exterior sensor
– Additional heating systems• Electrical heating housekeeper• Electrical heating in basement
– Cooling• Active cooling in basement• Ventilator in roof storey
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Analysis of building energy performance• Domestic hot water
– Sports secretary: Comb heater HR-Top 20 l– Youth parties: Boiler natural gas– Sports rooms: Electrical boiler 300 l– Rooms to let : Electrical boiler 10 l
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Analysis of building energy performance• Ventilation
– Not controlled natural ventilation– Very important leak looses
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Analysis of building energy performance• Lighting
– Artificial lighting• Installed power and light stream• Performance of systems• Under illuminated rooms• Easiness of usage
– Natural lighting– Light reflexion on inner walls– Dialux Professional
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Analyse huidige energieprestatie gebouwencomplex• Other electric consumption
– Distinction• Leak looses• Use consumption
– Calculations• Watt-hour meter• Using time
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Analysis of building energy performance
• EPB-results– E-level = 177 EPB = 100
– K-level = 153 EPB = 45– Ventilation loses limited in
proportion to transmission looses
Primary energyHeating 87,80%Cooling 0,73%Pumps, ventilators,… 1,16%Lighting 10,34%
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Recalculation of energy consumption
• Natural Gas consumptionVergelijking te verwachten aardgasverbruik (%)
0%
20%
40%
60%
80%
100%
aardg
asve
rbruik
verlie
sopp
ervla
kte
volum
e
algemeen secretariaatsport secretariaatportierswoningverdiepen achterbouw
Natural Gas consumption = 207.674 kWh/y
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Recalculation of energy consumption
• Electric consumption for lighting and appliances
Electric consumption back yard building and housekeepers' building(kWh/year)
10716
2618
490
1511
341
1428
4328
lighting
leak loses
no us looses boilers'Daalderop'use consumption officeappliancesuse consumption HiFi
refrigirators
others
Electric consumption = 21.432 kWh/y
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Business plan• Economic analysis
– Investment– Yearly savings
• Philosophy company
– No credit loans– Return investments > Return low-risk investment– Interest low risk investment <=> inflation energy price– Social profit organisation
} => Playback period
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Cost-effective energy and saving measures• Building
– Isolation building envelope• Vertical External walls
– From the inside» cheaper» Most rooms short time heating» Thermal capacity in floors
– XPS-platen, type ‘Wallmate’» Thickness ifo U-max and grants ‘Eandis’» Check inner condensation withe Glaser» Cost calculation
• Replace doors and windows • Isolation some roofs• Isolation floors above basements from underside
KaHo Sint-Lieven - Retro-commissioning for social-profit organisation 21
Cost-effective energy and saving measures
– Create isolated compartments• secretaries
– Use of rooms not at the same time– Great transmission looses to exterior– Gas consumption secretaries 64 % of total gas consumption.– Attention for cold bridges with inside insulation.– Lowering ceilings
• Isolate entrance hall from back yard building– entrance hall outside protected volume
• Ventilation plan– More important after insulation
» health» condensation
– Integration during refurbishing
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Cost-effective energy and saving measures• HVAC
– Extend central heating to housekeepers house– Eliminate active cooling in basement– Replace electric boiler: natural gas boiler
• Lighting and electric appliances– Lighting
• Replacement of light bulbs by fluorescent lamps• Linear fluorescent lamps
Software ‘Dialux Professional’
– Replacement of electric appliances• refrigerators door A++-model• Electrical boiler 300 l with gas boiler
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Cost-effective energy and saving measures• Small measures
– Unplug seldom-used appliances – Use power strips to switch off appliances – Set Computers to Sleep and Hibernate– Radiator foil– Insulation of heating tubes and boilers– Maintenance of heating system– Draught excluder and draught brushes
• REUS : Rational Energy Use – energy-saving tips for users– Ongoing monitoring of energy use
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Step plan• Summary cost-benefits
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Step plan• Summary cost-benefits
– Category 1: free measures
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Step plan• Summary cost-benefits
– Category 2: Investments with payback 1 year
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Step plan• Summary cost-benefits
– Category 3: Investments with payback > 1 year
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Daling energiekosten t.g.v. voorgestelde maatregelen
0%10%20%30%40%50%60%70%80%90%
100% energiebesparingen zonderinvesteringskostenergiebesparingen waarbijterugverdientijd < 1 jaarenergiebesparingen waarbijterugverdientijd > 1 jaarresterende energiekosten
Step plan• Global financial consideration
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Step plan• Global financial consideration
Yearly investment cost + energy cost
Yearly energy cost without measures
Finance term < 8 year- Own capital .
- Grants ‘Eandis’
=>
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Conclusion• Retro Cx:
– Important energy savings are possible• Small measures first• Rational energy use and ongoing Cx
– Cost-effective step-by-step approach instead of credit loans• After small measures large measures can be taken
– Comfort improvement