Transcript Slide 1

DST, Decision Support Tool for
energy-efficient and sustainable
renovation of dwellings
What is a DST?
• DST is a tool, containing simple guidelines to help
energy-efficient and sustainable renovation of dwellings.
• DEMOHOUSE project aims to develop minimum standards
for energy-efficient and sustainable renovation of dwellings.
• Main decisions in relation to ambitions in energy-efficiency,
sustainability,
economic
feasibility
and
occupants’
participation take place in the first, or the initiative phase.
For whom is the DST?
• The Decision Support Tool is focusing on decision makers
(for example housing association managers, home owners
association, etc. ).
Why energy efficient renovations ?
How energy efficient renovations ?
Barriers and Opportunities
Demohouse Renovation Projects
• The tool also contains practical and in-depth information of
relevance to: architects, energy experts, building contractors,
and building users.
What kind of decisions are supported with the DST?
• Decision making process towards facilitating energyefficient and sustainable renovation of dwellings.
Why an energy-efficient and
sustainable renovation?
Quality indicators as benefits associated with this type of
renovation.
DST home page
Property Value
Lettability
Energy Labeling
Comfort
Social Status
Living Costs
Environment
How energy efficient renovations ?
Why energy efficient renovations ?
Property Value
Lettability
Comfort
Social Status
Environment
Living Costs
Energy Labeling
Enhanced Property Value
• Energy efficiency is rapidly becoming a factor in the value
or selling price of dwellings.
• Customers are increasingly becoming prepared to pay for
improved living comfort.
• The EPBD, Energy Performance Building Directive,
energy label of the dwelling will influence its market
position.
DST home page
• A ‘good’ EPBD energy label results in a positive image for
marketing and selling purposes.
Property Value
Lettability
Energy Labeling
Comfort
Social Status
Living Costs
Environment
How energy efficient renovations ?
Why energy efficient renovations ?
Improved Lettability
• If tenants can choose between a label A and label C
dwelling, they will prefer the label A.
• In a mild rental housing market, energy efficiency (the
EPBD energy label) will influence lettability.
• Satisfied inhabitants are the best advertisements for
energy efficient house retrofit.
DST home page
Property Value
Lettability
Energy Labeling
Comfort
Social Status
Living Costs
Environment
How energy efficient renovations ?
Why energy efficient renovations ?
Improved Building Energy Labeling
After Renovation
• EPBD, Energy Performance Building Directive label
reflects the energy efficiency of a dwelling on a scale from
A to G.
• Label A reflects the best energy performance and label G
reflects the lowest energy performance.
Before Renovation
• Energy Efficient renovation will yield a higher label.
DST home page
Property Value
Lettability
Energy Labeling
Comfort
Social Status
Living Costs
Environment
How energy efficient renovations ?
Why energy efficient renovations ?
Building energy label
• It is the obligation of the building owner to hand over an
Energy Performance Certificate that shows the energy
performance of the dwelling with the corresponding EPBD
label when selling or letting a dwelling.
Recommended reading
D13 New management
Strategies. To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Comfort
• Comfortable indoor climate as a result of eliminating heat
losses and cold draughts with high level of insulation and
air-tightness of the building skin, in particular around
windows.
• Sound reduction using energy efficient and air-tight fitted
windows and doors in addition to draught reduction.
DST home page
• Prevention of condensation on indoor surfaces, thus
preventing growth of moulds and fungus.
• Prevention of moist indoor air penetrating the structure,
causing condensation resulting in possible structural
damages due to decay, corrosion and frost.
• The constant air renewal with a mechanical ventilation
system provides good indoor air quality, removing odours
and harmful indoor pollutants.
Property Value
Lettability
Energy Labeling
Comfort
Social Status
Living Costs
Environment
How energy efficient renovations ?
Why energy efficient renovations ?
• Thermal comfort for tenants.
temperatures all year round.
Comfortable
room
Social Status
• Sustainable renovation supports improvement of the
neighbourhood image, attracting tenants of good social
background.
• Sustainable renovation supports identification with the
neighbourhood.
DST home page
Property Value
Lettability
Energy Labeling
Comfort
Social Status
Living Costs
Environment
How energy efficient renovations ?
Why energy efficient renovations ?
Lower Living Costs and Affordability
•
Lower energy costs mean lower living cost for owner
occupants and tenants.
•
Lower living costs result in an increased affordability
of the housing for lower income groups.
•
Lowering living costs is a key task for social housing
organisations.
•
An energy efficient dwelling is ‘future proof’ against
rising energy prices.
DST home page
Property Value
Lettability
Energy Labeling
Comfort
Social Status
Living Costs
Environment
How energy efficient renovations ?
Why energy efficient renovations ?
Environment
• Low energy consumption after renovation results in lower
CO2 emissions and therefore a lower impact on the
environment.
• Use of sustainable building materials, water treatment and
reuse also results in a lower impact on the environment.
DST home page
• It was demonstrated in all Demohouse renovation projects
percentages of energy savings compared to pre-retrofitting
situation from 50 to 85%.
Image source:
http://energypicturesonline.com
Property Value
Lettability
Energy Labeling
Comfort
Social Status
Living Costs
Environment
How energy efficient renovations ?
Why energy efficient renovations ?
D9 Life Cycle Optimisation
and CO2 Reduction.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
D16.1Demohouse renovation
projects assessment of
environmental, economical
and social impacts.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Barriers and opportunities for an
energy-efficient and sustainable renovation
DST home page
Architectural
Architectural
Financial
Legal
Social
Technical
How energy efficient renovations ?
Why energy efficient renovations ?
Social
Financial
Technical
Legal
D1C Barriers to
sustainable renovations.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Barriers and opportunities for an
energy-efficient and sustainable renovation
Architectural
• Preserving the façade of a monumental building may
prevent application of external insulation.
DST home page
Danish Demohouse
before renovation
• Internal insulation is often possible but requires careful
design to prevent condensation within the facade.
• Preserving the look of the façade opens opportunities for
innovative designs.
Architectural
Financial
Legal
Social
Technical
How energy efficient renovations ?
Why energy efficient renovations ?
Danish Demohouse
after renovation
Barriers and opportunities for an
energy-efficient and sustainable renovation
Financial
• Profitability: increased height of investment is regarded as
a barrier, while increased market value at the same time
can be an opportunity.
DST home page
• Financial consequences for the tenants: rent increase
(barrier) versus lower living costs (opportunity).
• Marketability: need for extra promotional effort (barrier)
versus higher appeal to potential buyers and enter new
markets (opportunities).
• High payback times and higher economical risks can be a
barrier, while banks are considering energy efficiency as a
new field of interest.
Architectural
Financial
Legal
Social
Technical
How energy efficient renovations ?
Why energy efficient renovations ?
Barriers and opportunities for an
energy-efficient and sustainable renovation
Financial
• One of the main barriers of energy efficient renovation is
the extra investment required, compared to a ‘standard’ or
‘business as usual’ renovation.
DST home page
• Several options exist to (help) overcome the financial
barrier, e.g novel financial models:
ESCO, Energy Service Company
Low Cost components e.g. HRV-unit
Roof top apartment
Architectural
Financial
Legal
Social
Technical
How energy efficient renovations ?
Why energy efficient renovations ?
Barriers and opportunities for an
energy-efficient and sustainable renovation
Legal and administrative issues
• Legal and administrative constraints (permits, procedures)
can be a barrier.
• Lack of existing legislation can be a barrier.
DST home page
Architectural
Financial
Legal
Social
Technical
How energy efficient renovations ?
Why energy efficient renovations ?
• Governmental institutions encouraging sustainability in
buildings can be an opportunity.
Barriers and opportunities for an
energy-efficient and sustainable renovation
Social
• Usually there is a high percentage of support needed
amongst the present tenants for collective measures.
DST home page
• Even when tenant consensus is not formally required,
the tenants will be more willing to cooperate and be
happier with the result if they can have a say in the
process.
• If tenants can participate in finding solutions, they will
be more readily accepted.
• Lack of knowledge can be a motivational problem. Visit
to efficient-renovation examples and monitored results
can be used to inform and educate tenants.
Architectural
Financial
Legal
Social
Technical
How energy efficient renovations ?
Why energy efficient renovations ?
• Temporary re-housing during construction works is an
additional barrier for support of the present occupants.
• Keeping the renovation period as short as possible to
avoid length of temporary re-housing. Offering bonus
tickets to visit local attractions, parks, etc. can greatly
please the tenants.
Barriers and opportunities for an
energy-efficient and sustainable renovation
Technical
• Some solutions require complex installations that people
may not understand how to use. As a result, energy savings
will be lower than expected. Try to use user friendly
technologies/interfaces.
DST home page
• Experience shows that in any renovation process, errors or
failures occur. With Quality Control during the renovation,
these can be corrected.
More information Thermohraphic Camera test
More information Blower Door test
Architectural
Financial
Legal
Social
Technical
How energy efficient renovations ?
Why energy efficient renovations ?
• Lack of knowledge/technical know-how can be a barrier in
the steps of the building process. However, once the
knowledge/experience is gained, it will be a competitive
advantage.
How to do an energy-efficient, affordable
and sustainable renovation?
Is addressed through three main aspects categorised as:
DST home page
Technical aspect
Financial aspect
Social aspect
Financial aspect
Technical aspect
Social aspect
Technical aspect
• The first step in a renovation is to set the target for the
energy consumption. A good indicator is the energy need
for heating per m2 of floor area per annum (kWh/m2a).
• One m3 of natural gas or 1 liter of oil equals about 10 kWh
of heat. So the indicator for a dwelling of 100 m2 consuming
1500 m3 of natural gas per year is 1500 x 10 kWh/a/ 100
m2 or 150 kWh/m2a, (where the a stands for annual or
yearly).
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
• Typically a household use 300-500 m3 of gas for DHW
(Domestic Hot Water) so if you only know the total gas
consumption, this number has to be deducted from the total
to arrive at the number for space heating.
• Some low energy values for space heating:
- 15 kWh/m2a to reach the German
Passive House Standard for new built.
- 25-30 kWh/m2a for a ‘Passive House’
renovation.
- 50 kWh/m2a for a low energy building.
- 100 kwh/m2a for a typically built.
Technical aspect
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
•
The first step in energy efficient renovation is
minimising the demand, by the following 3 steps:
1.
Insulating of the building skin (walls, high efficiency
glazing).
2.
Minimising the air leakage to avoid ‘infiltration
(unwanted cold air entering the building).
3.
Heat recovery in the ventilation system.
•
The second step is introduction of renewable energy
(solar collectors, PhotoVoltaic or PV cells)
•
The final step is introduction of efficient equipment,
such as a condensing gas fired boiler or heat pump.
When the target level for energy in the renovation is
set and a general idea is formed on which measures
to invest, the design team can work on design and
technical specification of the renovation.
Technical aspect
Further information and guidance
• ‘Rules of thumb’ on energy efficiency, application
of renewable energy and different improvement
techniques and target values applied on:
• The building envelope
• Building services
Best Available Technologies, BAT
Low-cost Technical Solutions
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
• Construction Quality Control Tools
Thermographic Camera Test
Blower Door Test
• Awareness Tools
The Green Questionnaire
• Evaluation Tools
Energy Signature
Common Evaluation Protocol
• Demohouse Renovation Projects
Lessons learned
BAT, Best Available Technologies for energy efficient renovation
Information on the present state of each Best Practice
Technology in Europe for energy-efficient renovations is
shown below. It includes the expected target/goal
values for 2011, when stricter requirements are expected
based on the EPBD, Energy Performance Building
Directive.
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
Europe is divided into three zones based on climatic regions:
Zone I: Northern Europe
Zone II: Central Europe
Zone III: Southern Europe
Best Available Technologies:
To view any of items below go to:
http://www.demohouse.net/reports/monitoring/best-available-technologies/
- Insulation
- Low energy windows
- Air tight constructions
- Heat recovery ventilation
- Condensing gas boilers
- District heating systems
- Combined heat and power production
- Heat pumps
- Natural, hybrid and PV-assisted ventilation
- Solar domestic hot water heating systems
- PV installations
D1 State of the Art.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
D6 Catalogue of Best Available
Technologies. To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Low-cost Technical Solutions
• As part of the Danish Demohouse renovation project, a
cost-effective heat recovery ventilation unit was developed
with good thermal efficiency, low electricity consumption and
low noise level and easy installation to existing exhaust
system.
Filterbox in kitchen with two filters.
• It can be integrated along the walls or loft in a simple way
and with simple maintenance (e.g. change of filter).
DST home page
Technical aspect
Financial aspect
Social aspect
• The improved HRV unit design makes an installed price per
appartment of less than 3000 EURO possible.
Three parts for low-cost HRV unit.
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
HRV duct work in kitchen (to be
painted white).
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
D1 State of the Art.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Demohouse Renovations
Lessons learned
D6 Catalogue of Best
Available Technologies.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Low-cost Technical Solutions
Lightweight CO2 Neutral Pre-fabricated low energy roof
top apartment
• Prototype developed as part of the Danish Demohouse
renovation project.
DST home page
• Sale of such apartments at a good price (good views) can
(partly) cover extra investments for energy efficient
renovation.
Roof top apartment more information
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Roof top apartment demonstration
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
Roof top apartment
Technical information:
• Prefabricated components produced with high quality and
reduced cost.
• Advantages: well insulated, air-tight prefabrication. Low
overall weight (placed on existing roof of a concrete
housing block).
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
It includes:
-Heat recovery ventilation unit placed in a partition
wall (EcoVent)
-Ventilation air preheat in the metal roof, air solar
collector (Rannilla)
-13 m² PV modules covering ventilation and lighting
demand from solar energy
-An air tight timber-frame construction with paper
granulate-insulation and minimised thermal bridges
( U-value: 0.15 – 0.18 W/m²K)
-Highly energy efficient windows.
Roof top apartment demonstration.
Danish Demohouse.
The Green Build Questionnaire
• The Green Build Questionnaire is based on the Danish
developed Green Build Tool, which works as an energy and
environmental point system.
• It was developed by Cenergia, Denmark.
• When used the questionnaire assess all sustainable
renovation building measures included in the renovation
project.
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
• This includes measures concerning sustainability related to:
- Water, rainwater and sewage
- Indoor air climate
- Materials and constructions
- Waste
- Energy
- Building and urban development area
• The user should use the questionnaire in two phases:
- 1. Provides guidance through intentions in the
renovation.
- 2. Provides advise on optimum renovation measures
at the kick-off of the building process when all renovation
details are known.
• As a result, the energy and environmental points get one of
the A to M rating categories.
The Green Build Questionnaire
To see the Questionnnaire select:
http://www.demohouse.net/reports/monitoring/other/
Construction Quality Control Techniques
Thermographic Camera Test
• Used to identify existence of thermal bridges in buildings
• Picture are taken with an infra red camera
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
• On the infrared photograph different colours show different
temperature of each object
Before renovation
• In this way hot and cold parts of a building are visualised
and identified
• It can be used to show the heat radiation and any parts of
missing insulation in walls
• It is also an effective method to show moisture damage,
especially in old buildings
After renovation
D8.1 Monitoring Programme in
Demohouse renovation buildings.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Construction Quality Control Techniques
Thermographic Camera Test
• Construction Quality Control in the course of the
renovation appears to be very important in order to reveal
potential faults within construction work.
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
• In the Austrian Demohouse project project, thermographic
photographs taken after the renovation revealed missing
parts of insulation of the building envelope. As a result the
contractor was responsible for repair.
• The price of the thermographic quality control
investigation by a specialist company is a fraction of the
overall building cost (typically around 1000 €).
• The long term benefits of giving finding out and correcting
incorrect placement of insulation, cold bridges, air leakages
outweight the costs of cost of investigation.
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
D8.1 Monitoring Programme in
Demohouse renovation buildings.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Missing insulation around the entrance detected with thermography and
had to be rectified by the building contractor.
• In the Danish Demohouse project, repeated
blower door tests in the course of the renovation
proved very useful to correct failures in achieving
the air-tightness required.
Construction Quality Control Techniques
Blower Door Test
• In an energy-efficient renovation heat losses
through unintentional air changes must be minimised
by ensuring an air tight building envelope
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
• In a blower door test, the dwelling is pressurised to
50 Pa (0.0005 of normal atmospheric pressure) and
corresponding air flow is measured. The leakier the
building, the higher the air flow.
Blower door used in air
tightness testing of a
renovated buidling.
•The air flow is related to the size of the building and
expressed as infiltration rate n50 (the subscript 50
denotes at 50 Pa). So an n50 of 1 per hour means
that each hour an amount of air is moving through
the dwelling equal to the volume of the dwelling (at
50 Pa overpressure).
• Under normal circumstances the pressure
difference between indoor and outdoor is less than
50Pa. As a guideline, the air exchange rate (from
wind pressure etc.) equals n50/20.
• The German Passive House standard requires an
n50 of 0.6 per hour or less.
• Good practice in renovation is an n50 of 2.0 per hour
or less.
Continuous air tight layer (in red)
Throughout building structure.
D5 Securing air tightness
in buildings. To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
D8.1Monitoring Programme in
Demohouse renovation buildings.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
• In the Danish Demohouse project, repeated
blower door tests in the course of the renovation
proved very useful to correct failures in achieving
the air-tightness required.
Construction Quality Control Techniques
Blower Door Test
DST home page
• D5 Securing air tightness in buildings (Executive
Summary) report provides instructions for carrying out an
air tightness tests and recommendations on milestones
for undertaking tests in renovation projects. Results are
also presented of all Demohouse renovation projects air
tightness measures implemented and Blower Door
Tests.
Blower door used in air
tightness testing of a
renovated buidling.
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
Continuous air tight layer (in red)
Throughout building structure.
D5 Securing air tightness
in buildings. To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
D8.1Monitoring Programme in
Demohouse renovation buildings.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Energy Signature
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
•
Is a procedure to document the overall energy use for
space and water heating.
•
The procedure entails plotting the weekly (or monthly
energy consumption per m2 of floor area versus the
average ambient temperature in that period (week or
month).
•
The lower the ambient temperature, the higher the
energy consumption for space heating. The slope of
the line is an indication of the thermal quality of the
building (the lower the slope, the better)
•
In summertime (average ambient temperature 15°C
or more), there should be no energy demand for
space heating. Remaining energy demand is for
DHW and should be around 10 kWh/m2. Higher
values indicate there could be something not working
well in the heating system.
Example of Energy Signature use.
To see the example select:
http://www.demohouse.net/reports/monitoring/other/
Common Evaluation Protocol
Is to be used as basis for evaluation of housing projects in
terms of improvement of sustainability, energy and
socio-economic aspects.
The format of the evaluation protocol includes 3 parts:
1. The documentation part.
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
2. The evaluation part.
The evaluation is split into:
Pre-renovation evaluation carried out before the start
of the renovation works.
Evaluation during the renovation process.
Post-renovation evaluation, in short post-renovation
carried out after the end of the renovation works.
3. The comparison part of the results of the pre and post
evaluation
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
D23 Applicability of the Common Evaluation Protocol.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
DEMOHOUSE Renovation Projects
Buildings renovated under sustainable criteria and ‘Lessons
learned’ from renovations.
DST home page
Austrian Demohouse
Danish Demohouse
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
DEMOHOUSE brochure.
To see the brochure select:
http://www.demohouse.net/reports/monitoring/other/
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
Greek Demohouse
Hungarian Demohouse
Spanish Demohouse
D1C Barriers for sustainable and energy conscious
renovation.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Paper: ”Energy efficient renovation of dwellings:
lessons learned”.
To see the paper select:
http://www.demohouse.net/reports/monitoring/other/
Austrian Demohouse Building
DST home page
Technical aspect
Financial aspect
Social aspect
Country,
City
Year of
construct.
Characteristics
Main energy
saving
measures
Austria,
Graz
1975-76
Two blocks of
flats,
Social housing
District heating
Insulation of
building envelope
Biomass-CHPplant
Quality control
(e.g. IRphotography)
Results of the renovation project:
Lessons learned_Austrian renovation project
•What went well
•What did not go well
•Lessons learned
•Monitoring
net floor
area
[m2]
simple
PBT [yrs]
renovatio
n cost
[€/m2]
Austria
9860
14
130
102
52%
Austria,
no CHP
8
118
102
22%
9860
Green Questionnaire
Demohouse Renovations
Lessons learned
After renovation
Austrian Demohouse building:
- Selection of the building material
has strong influence on the ecological
performance of the building.
- Innovative financing models (ESCO)
could have solved the split-incentive
problem
Best Available Technologies
Low-cost Technical Solutions
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Before renovation
Space
heating +
DHW
[kWh/m2a]
CO2savings
[%]
DEMOHOUSE brochure.
To see the brochure select:
http://www.demohouse.net/reports/monitoring/other/
Danish Demohouse
Country,
City
Year of
construct.
Characteristics
Main energy
saving
measures
Denmark,
Copenhag
en
1965-1969
3 (of 12)
building blocks,
Prefab concrete
District heating
Insulation of
building
envelope
Air tightness
Heat recovery
unit each
apartment
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Results of the renovation project:
Lessons learned_Danish renovation project
•What went well
•What did not go well
•Lessons learned
•Monitoring
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
Denmark
Ecovent heat
recovery unit
Rooftop Apartment
Before renovation
After renovation
Danish Demohouse building:
- Low-cost version of the Heat
Recovery Ventilation system
necessary, ease of implementation.
net floor
area
[m2]
simple
PBT [yrs]
renovation
cost [€/m2]
Space heating +
DHW [kWh/m2a]
CO2savings
[%]
2880
21
218
40
50%
DEMOHOUSE brochure.
To see the brochure select:
http://www.demohouse.net/reports/monitoring/other/
Greek Demohouse
Country,
City
Year of
constru
ct.
Characteristics
Main energy
saving
measures
Greece,
Athens
20052007
Newly Built,
Concrete
structure,
Brick walls
Insulation of
building envelope
Ground heat
exchangers for
cooling
Demand
controlled
ventilation (CO2)
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Results of the renovation project:
Lessons learned_Greek (newbuilt) project
•What went well
•What did not go well
•Lessons learned
•Monitoring
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
Greece
During construction
Greek Demohouse building
- Inform future occupants in an early
stage about energy efficient measures
and their effect.
- In south European countries
insulation of building envelope pays off.
net floor area
[m2]
simple
PBT [yrs]
renovation
cost [€/m2]
Space heating
+ DHW
[kWh/m2a]
CO2savings
[%]
2787
17
115
46
48%
DEMOHOUSE brochure.
To see the brochure select:
http://www.demohouse.net/reports/monitoring/other/
Hungarian Demohouse
Country,
City
Year of
construct.
Characteristics
Hungary,
Budapest
1955-1960
Former military
building
3 (of 11) blocks
of 3 storey
building
bricks/concrete
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Demohouse Renovations
Lessons learned
Insulation of
building
envelope
Solar collectors
+ PV
Rooftop
apartment
Before renovation
Proposed
Hungarian Demohouse building:
- Long term federal or local subsidies
are necessary to implement energy
efficient renovation.
- Dissemination of information to
decision makers is crucial.
Results of the renovation project:
Lessons learned_Hungarian renovation project
•What went well
•What did not go well
•Lessons learned
•Monitoring
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Main energy
saving
measures
Hungary
net floor
area
[m2]
simple
PBT
[yrs]
renovation
cost [€/m2]
Space
heating +
DHW
[kWh/m2a]
CO2saving
s [%]
6300
30
117
22
73%
DEMOHOUSE brochure.
To see the brochure select:
http://www.demohouse.net/reports/monitoring/other/
PV roof system
Spanish Demohouse
Country,
City
Year of
construct.
Characteristics
Main energy
saving
measures
Spain,
Bilbao
1910,
partly renov
1960
Old Town,
historical area, 4storey, brick
walls, tiled roof
Insulation of
building
envelope
Solar
collectors +
PV
Building
Management
System
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Before
Results of the renovation project:
Lessons learned_Spanish renovation project
•What went well
•What did not go well
•Lessons learned
•Monitoring
Spanish Demohouse building:
- Historical buildings require particular
studies to adapt sustainable measures
to additional criteria (e.g. aesthetics).
- Financial support of local government
is key element for renovation,
particularly in degraded areas.
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Spain
Demohouse Renovations
Lessons learned
After renovation
net floor
area
[m2]
simple PBT
[yrs]
renovation
cost [€/m2]
Space heating +
DHW [kWh/m2a]
CO2-savings
[%]
496
26
1463
80
64%
DEMOHOUSE brochure.
To see the brochure select:
http://www.demohouse.net/reports/monitoring/other/
Monitoring of Demohouse Renovation Projects
Information will be available in late 2008.
DST home page
Technical aspect
Financial aspect
Social aspect
Best Available Technologies
Low-cost Technical Solutions
Green Questionnaire
IR Camera Test
Blower Door Test
Energy Signature
Common Evaluation Protocol
Demohouse Renovations
Lessons learned
Financial aspect
One of the main barriers of energy efficient renovation is
the extra investment required, compared to a ‘standard’ or
‘business as usual’ renovation.
Several options exist to (help) overcome the financial
barrier.
Novel financial models: ESCO Energy Service
Company
DST home page
Technical aspect
Financial aspect
Social aspect
The savings payback
periods
in
all
Demohouse renovation
projects payback times
ranges from 15 to 35
years, although most
common figures are
around 25 years.
• ESCO can be initiated to do engineering, finance and
even do the maintenance and financial administration of
renovated buildings.
• By outsourcing energy efficient installations, the housing
association need lower investment and have lower financial
risk.
• The energy service companies have the funds to invest in
solar roofs, windmills, bio-fuel plants, heat storage in buffer
tanks etc.
D9 Life Cycle Optimisation
and CO2 Reduction.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Demohouse Renovations
Lessons learned
D13 New management strategies.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Financial aspect
One of the main barriers of energy efficient renovation is
the extra investment required, compared to a ‘standard’ or
‘business as usual’ renovation.
Several options exist to (help) overcome the financial
barrier.
DST home page
Technical aspect
Financial aspect
Social aspect
Novel financial models:
ESCO, Energy Service Company
vs
EPC, Energy Performance Contracting
• An ESCO, Energy Service Company is a firm typically
hired by a building owner wanting to improve building's
energy performance and/or decrease its running energy
costs.
• The ESCO is the organisation that realises the energy
savings in the project.
• The ESCO and the building owner sign a contract (usually
5-10 years).
• EPC, Energy Performcance Contracting is an activity, or
in general, a concept.
Demohouse Renovations
Lessons learned
• With the EPC, in the contract (energy conservation) it is
set the performance that the ESCO has to achieve each
year. Hence the name energy performance contracting.
D9 Life Cycle Optimisation
and CO2 Reduction.
To see the report select:
http://www.demohouse.net/reports/monit
oring/reports/
D13 New management strategies.
To see the report select:
http://www.demohouse.net/reports/monit
oring/reports/
Financial aspect
One of the main barriers of energy efficient renovation is
the extra investment required, compared to a ‘standard’ or
‘business as usual’ renovation.
Several options exist to (help) overcome the financial
barrier.
DST home page
Technical aspect
Financial aspect
Social aspect
Novel financial models:
Roof top apartment
• Sale of such apartments at a good price (good views) can
(partly) cover extra investments for energy efficient
renovation.
• Prefabricated components produced with high quality and
reduced cost. Advantages: well insulated, air-tight
prefabrication. Low overall weight (placed on existing roof
of a concrete housing block).
Roof top apartment demonstration.
Danish Demohouse.
D9 Life Cycle Optimisation
and CO2 Reduction.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Demohouse Renovations
Lessons learned
D13 New management strategies.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Financial aspect
One of the main barriers of energy efficient renovation is
the extra investment required, compared to a ‘standard’ or
‘business as usual’ renovation.
Several options exist to (help) overcome the financial
barrier.
Novel financial models:
Low cost components, e.g. HRV-unit
DST home page
HRV-unit more information
Technical aspect
Financial aspect
Social aspect
D9 Life Cycle Optimisation
and CO2 Reduction.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Demohouse Renovations
Lessons learned
Three parts for low-cost HRV unit.
D13 New management strategies.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Financial aspect
Life cycle optimisation and CO2 reduction
• Each Demohouse renovation project is analysed with
regards to the energy and CO2 emission saving potential
and the costs of implementing renovation measures.
• Pay back times for renovation investments are calculated
and compared to pay back times in typical renovations.
DST home page
• Optimal renovation measures are identified.
Technical aspect
Financial aspect
Social aspect
D9 Life Cycle Optimisation
and CO2 Reduction.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Demohouse Renovations
Lessons learned
D13 New management strategies.
To see the report select:
http://www.demohouse.net/reports/monitoring/reports/
Social aspect
• Advantages of occupants involvement:
- Experience shows that tenants will be more willing to
cooperate and be happier with the result if they can
participate in the renovation process. This makes decision
making harder, but the result is more rewarding to all.
• The sustainable renovation has a social impact on
neighborhood level so check if there are funds available in
your country for reviving the neighborhood.
DST home page
Technical aspect
Financial aspect
Social aspect
• Tenants participation from early stages of renovation
improves the renovation process
• Benefits of providing building users with information on
proper energy-efficient house use and maintenance
Indicators and questionnaires have been developed for
Demohouse projects to measure socio-economic qualities:
- Changes resulting from the renovation regarding the
number of dwellings and their characteristics
- The rent level and affordability
- Energy cost
- The housing situation and the financial aspects of the
renovation.
Demohouse Renovations
Lessons learned
D14
Assessment of environmental,
economical and social impacts involving
the whole life cycle.
To see the report select:
http://www.demohouse.net/reports/moni
toring/reports/