Why energy efficient renovations

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. ).
• 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
  energy-efficient and sustainable renovation of
  dwellings.

Why energy efficient renovations ?
How energy efficient renovations ?
Barriers and Opportunities
Demohouse Renovation Projects
2
Why an energy-efficient and sustainable
renovation? Quality indicators as benefits
associated with this type of renovation.
DST home page
Lettability
Property Value
Social Status
Comfort
Property Value Lettability Energy
Labeling Comfort Social Status Living
Costs Environment
Living Costs
Environment
Energy Labeling
How energy efficient renovations ?
Why energy efficient renovations ?
3
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.
• A good EPBD energy label results in a positive
  image for marketing and selling purposes.

DST home page
Property Value Lettability Energy
Labeling Comfort Social Status Living
Costs Environment
How energy efficient renovations ?
Why energy efficient renovations ?
4

• 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 ?
5
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.
• Energy Efficient renovation will yield a higher
  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.

Before Renovation
Building energy label
DST home page
Property Value Lettability Energy
Labeling Comfort Social Status Living
Costs Environment
Recommended reading D13 New management
Strategies. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
How energy efficient renovations ?
Why energy efficient renovations ?
6

• 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.
• 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.
• Thermal comfort for tenants. Comfortable room
  temperatures all year round.

DST home page
Property Value Lettability Energy
Labeling Comfort Social Status Living
Costs Environment
How energy efficient renovations ?
Why energy efficient renovations ?
7
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 ?
8

• 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 ?
9

• 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.
• It was demonstrated in all Demohouse renovation
  projects percentages of energy savings compared
  to pre-retrofitting situation from 50 to 85.

DST home page
Image source http//energypicturesonline.com
D9 Life Cycle Optimisation and CO2 Reduction. To
see the report select http//www.demohouse.net/r
eports/monitoring/reports/
Property Value Lettability Energy
Labeling Comfort Social Status Living
Costs Environment
D16.1Demohouse renovation projects assessment of
environmental, economical and social
impacts. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
How energy efficient renovations ?
Why energy efficient renovations ?
10
Barriers and opportunities for an
energy-efficient and sustainable renovation
DST home page
Financial
Architectural
Legal
Architectural Financial Legal Social Technical
D1C Barriers to sustainable renovations. To see
the report select http//www.demohouse.net/repor
ts/monitoring/reports/
Social
Technical
How energy efficient renovations ?
Why energy efficient renovations ?
11
Barriers and opportunities for an
energy-efficient and sustainable renovation
Architectural

• Preserving the façade of a monumental building
  may prevent application of external insulation.
• 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.

Danish Demohouse before renovation
DST home page
Architectural Financial Legal Social Technical
Danish Demohouse after renovation
How energy efficient renovations ?
Why energy efficient renovations ?
12
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.
• 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.

DST home page
Architectural Financial Legal Social Technical
How energy efficient renovations ?
Why energy efficient renovations ?
13
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.
• Several options exist to (help) overcome the
  financial barrier, e.g novel financial models

DST home page
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 ?
14
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.
• Governmental institutions encouraging
  sustainability in buildings can be an
  opportunity.

DST home page
Architectural Financial Legal Social Technical
How energy efficient renovations ?
Why energy efficient renovations ?
15
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.
• 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.
• 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.

DST home page
Architectural Financial Legal Social Technical
How energy efficient renovations ?
Why energy efficient renovations ?
16
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.
• 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
• 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.

DST home page
Architectural Financial Legal Social Technical
How energy efficient renovations ?
Why energy efficient renovations ?
17
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
18

• 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).
• 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.

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
19

• Technical aspect
• The first step in energy efficient renovation is
  minimising the demand, by the following 3 steps
• Insulating of the building skin (walls, high
  efficiency glazing).
• 2. Minimising the air leakage to avoid
  infiltration (unwanted cold air entering the
  building).
• 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.

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
20

• 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
• Construction Quality Control Tools
• Thermographic Camera Test
• Blower Door Test
• Awareness Tools
• The Green Questionnaire
• Evaluation Tools
• Energy Signature
• Common Evaluation Protocol

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
21

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. 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
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
D1 State of the Art. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
D6 Catalogue of Best Available Technologies. To
see the report select http//www.demohouse.net/r
eports/monitoring/reports/
Demohouse Renovations Lessons learned
22

• 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.
• It can be integrated along the walls or loft in
  a simple way and with simple maintenance (e.g.
  change of filter).
• The improved HRV unit design makes an installed
  price per appartment of less than 3000 EURO
  possible.

Filterbox in kitchen with two filters.
DST home page
Technical aspect Financial aspect Social aspect
Three parts for low-cost HRV unit.
Best Available Technologies Low-cost Technical
Solutions Green Questionnaire IR Camera
Test Blower Door Test Energy Signature Common
Evaluation Protocol
HRV duct work in kitchen (to be painted white).
D1 State of the Art. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
D6 Catalogue of Best Available Technologies. To
see the report select http//www.demohouse.net/r
eports/monitoring/reports/
Demohouse Renovations Lessons learned
23

• Low-cost Technical Solutions
• Lightweight CO2 Neutral Pre-fabricated low energy
  roof top apartment
• Prototype developed as part of the Danish
  Demohouse renovation project.
• Sale of such apartments at a good price (good
  views) can (partly) cover extra investments for
  energy efficient renovation.

DST home page
Roof top apartment more information
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
Roof top apartment demonstration
Demohouse Renovations Lessons learned
24

• 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).
• 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.

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
Roof top apartment demonstration. Danish
Demohouse.
Demohouse Renovations Lessons learned
25
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.
• 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.

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
The Green Build Questionnaire To see the
Questionnnaire select http//www.demohouse.net/r
eports/monitoring/other/
Demohouse Renovations Lessons learned
26
Construction Quality Control Techniques Thermogra
phic Camera Test

• Used to identify existence of thermal bridges in
  buildings
• Picture are taken with an infra red camera
• On the infrared photograph different colours
  show different temperature of each object
• 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

Before renovation
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
After renovation
D8.1 Monitoring Programme in Demohouse renovation
buildings. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
Demohouse Renovations Lessons learned
27
Construction Quality Control Techniques Thermogra
phic 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.
• 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.

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
D8.1 Monitoring Programme in Demohouse renovation
buildings. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
Demohouse Renovations Lessons learned
Missing insulation around the entrance detected
with thermography and had to be rectified by the
building contractor.
28

• 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
• 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.
• 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.

Blower door used in air tightness testing of a
renovated buidling.
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
Continuous air tight layer (in red) Throughout
building structure.
D5 Securing air tightness in buildings. To see
the report select http//www.demohouse.net/repor
ts/monitoring/reports/
D8.1Monitoring Programme in Demohouse renovation
buildings. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
Demohouse Renovations Lessons learned
29

• 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
• 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.
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
Continuous air tight layer (in red) Throughout
building structure.
D5 Securing air tightness in buildings. To see
the report select http//www.demohouse.net/repor
ts/monitoring/reports/
D8.1Monitoring Programme in Demohouse renovation
buildings. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
Demohouse Renovations Lessons learned
30
Energy Signature

• 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 15C
  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.

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
Example of Energy Signature use. To see the
example select http//www.demohouse.net/reports/
monitoring/other/
Demohouse Renovations Lessons learned
31
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.
• 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

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
D23 Applicability of the Common Evaluation
Protocol. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
Demohouse Renovations Lessons learned
32
DEMOHOUSE Renovation Projects Buildings
renovated under sustainable criteria and Lessons
learned from renovations.

DST home page
Danish Demohouse
Austrian Demohouse
Technical aspect Financial aspect Social aspect
DEMOHOUSE brochure. To see the brochure select
http//www.demohouse.net/reports/monitoring/other
/
Best Available Technologies Low-cost Technical
Solutions Green Questionnaire IR Camera
Test Blower Door Test Energy Signature Common
Evaluation Protocol
D1C Barriers for sustainable and energy conscious
renovation. To see the report select
http//www.demohouse.net/reports/monitoring/repor
ts/
Greek Demohouse
Spanish Demohouse
Paper Energy efficient renovation of dwellings
lessons learned. To see the paper select
http//www.demohouse.net/reports/monitoring/other
/
Demohouse Renovations Lessons learned
Hungarian Demohouse
33

• Austrian Demohouse Building
• Results of the renovation project
• Lessons learned_Austrian renovation project
• What went well
• What did not go well
• Lessons learned
• Monitoring

Before renovation
After renovation
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 brochure. To see the brochure select
http//www.demohouse.net/reports/monitoring/other
/
Demohouse Renovations Lessons learned
34

Danish Demohouse
Ecovent heat recovery unit
Rooftop Apartment
DST home page

• Results of the renovation project
• Lessons learned_Danish renovation project
• What went well
• What did not go well
• Lessons learned
• Monitoring

Before renovation
After renovation
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 brochure. To see the brochure select
http//www.demohouse.net/reports/monitoring/other
/
Demohouse Renovations Lessons learned
35
Greek Demohouse

During construction
DST home page

• Results of the renovation project
• Lessons learned_Greek (newbuilt) project
• What went well
• What did not go well
• Lessons learned
• Monitoring

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 brochure. To see the brochure select
http//www.demohouse.net/reports/monitoring/other
/
Demohouse Renovations Lessons learned
36

Hungarian Demohouse
Before renovation
Proposed
DST home page
Technical aspect Financial aspect Social aspect

• Results of the renovation project
• Lessons learned_Hungarian renovation project
• What went well
• What did not go well
• Lessons learned
• Monitoring

Best Available Technologies Low-cost Technical
Solutions Green Questionnaire IR Camera
Test Blower Door Test Energy Signature Common
Evaluation Protocol
DEMOHOUSE brochure. To see the brochure select
http//www.demohouse.net/reports/monitoring/other
/
Demohouse Renovations Lessons learned
37
PV roof system
Spanish Demohouse

DST home page
Before
After renovation
Technical aspect Financial aspect Social aspect

• Results of the renovation project
• Lessons learned_Spanish renovation project
• What went well
• What did not go well
• Lessons learned
• Monitoring

Best Available Technologies Low-cost Technical
Solutions Green Questionnaire IR Camera
Test Blower Door Test Energy Signature Common
Evaluation Protocol
DEMOHOUSE brochure. To see the brochure select
http//www.demohouse.net/reports/monitoring/other
/
Demohouse Renovations Lessons learned
38

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
39

• 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
• 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.

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.
DST home page
Technical aspect Financial aspect Social aspect
D9 Life Cycle Optimisation and CO2 Reduction.
To see the report select http//www.demohouse.n
et/reports/monitoring/reports/
D13 New management strategies. To see the report
select http//www.demohouse.net/reports/monitori
ng/reports/
Demohouse Renovations Lessons learned
40

• 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
• 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.
• 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.

DST home page
Technical aspect Financial aspect Social aspect
D9 Life Cycle Optimisation and CO2 Reduction.
To see the report select http//www.demohouse.n
et/reports/monitoring/reports/
D13 New management strategies. To see the report
select http//www.demohouse.net/reports/monitori
ng/reports/
Demohouse Renovations Lessons learned
41

• 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
• 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).

DST home page
Technical aspect Financial aspect Social aspect
Roof top apartment demonstration. Danish
Demohouse.
D9 Life Cycle Optimisation and CO2 Reduction.
To see the report select http//www.demohouse.n
et/reports/monitoring/reports/
D13 New management strategies. To see the report
select http//www.demohouse.net/reports/monitori
ng/reports/
Demohouse Renovations Lessons learned
42

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.n
et/reports/monitoring/reports/
D13 New management strategies. To see the report
select http//www.demohouse.net/reports/monitori
ng/reports/
Demohouse Renovations Lessons learned
Three parts for low-cost HRV unit.
43

• 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.
• Optimal renovation measures are identified.

DST home page
Technical aspect Financial aspect Social aspect
D9 Life Cycle Optimisation and CO2 Reduction.
To see the report select http//www.demohouse.n
et/reports/monitoring/reports/
D13 New management strategies. To see the report
select http//www.demohouse.net/reports/monitori
ng/reports/
Demohouse Renovations Lessons learned
44

• 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.
• 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.

DST home page
Technical aspect Financial aspect Social aspect
D14 Assessment of environmental, economical and
social impacts involving the whole life cycle.
To see the report select http//www.demohouse.n
et/reports/monitoring/reports/
Demohouse Renovations Lessons learned