Retro-commissioning to improving building energy efficiency for social-profit organisation.

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.


Outline

• Existing building• Objectives• Methodology• Results• Conclusions


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


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


Objectives

• Improve energy efficiency of buildings • Cost effective

– Social profit organisation– 3 Step business plan

• Improve comfort if possible


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


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


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


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


Analysis of building energy performanceU-values


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


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


Analysis of building energy performance• Ventilation

– Not controlled natural ventilation– Very important leak looses


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


Analyse huidige energieprestatie gebouwencomplex• Other electric consumption

– Distinction• Leak looses• Use consumption

– Calculations• Watt-hour meter• Using time


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%


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


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


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


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


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


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


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


Step plan• Summary cost-benefits



– Category 1: free measures



– Category 2: Investments with payback 1 year



– Category 3: Investments with payback > 1 year


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


Step plan• Global financial consideration

Yearly investment cost + energy cost

Yearly energy cost without measures

Finance term < 8 year- Own capital .

- Grants ‘Eandis’

=>


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

Retro-commissioning to improving building energy efficiency for social-profit organisation.

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