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Why energy efficient renovations ?

Why energy efficient renovations ?

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Why energy efficient renovations ?

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  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 Environment Living Costs 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 Cdwelling, 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/reports/ 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 projectspercentages 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/reports/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/reports/ How energy efficient renovations ? Why energy efficient renovations ?

  10. Barriers and opportunities for an energy-efficient and sustainable renovation DST home page Architectural Financial Legal ArchitecturalFinancial Legal Social Technical D1C Barriers to sustainable renovations. To see the report select: http://www.demohouse.net/reports/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 ArchitecturalFinancial 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 ArchitecturalFinancial 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 ArchitecturalFinancial 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 ArchitecturalFinancial 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 ArchitecturalFinancial 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 competitiveadvantage. DST home page ArchitecturalFinancial 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 • Demohouse Renovation Projects • Lessons learned 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/reports/ D6 Catalogue of Best Available Technologies. To see the report select: http://www.demohouse.net/reports/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/reports/ D6 Catalogue of Best Available Technologies. To see the report select: http://www.demohouse.net/reports/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/reports/monitoring/other/ Demohouse Renovations Lessons learned

  26. Construction Quality Control Techniques Thermographic 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 DST home page Before 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 After renovation D8.1 Monitoring Programme in Demohouse renovation buildings. To see the report select: http://www.demohouse.net/reports/monitoring/reports/ Demohouse Renovations Lessons learned

  27. 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. • 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/reports/ 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/reports/monitoring/reports/ D8.1Monitoring Programme in Demohouse renovation buildings. To see the report select: http://www.demohouse.net/reports/monitoring/reports/ 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/reports/monitoring/reports/ D8.1Monitoring Programme in Demohouse renovation buildings. To see the report select: http://www.demohouse.net/reports/monitoring/reports/ 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 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. 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/reports/ 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 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/ D1CBarriers for sustainable and energy conscious renovation. To see the report select: http://www.demohouse.net/reports/monitoring/reports/ 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 Technical aspect Financial aspect Social aspect Before renovation After renovation 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 Technical aspect Financial aspect Social aspect • Results of the renovation project: • Lessons learned_Greek (newbuilt) 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

  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 Technical aspect Financial aspect Social aspect Before After renovation • 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.net/reports/monitoring/reports/ D13 New management strategies. To see the report select: http://www.demohouse.net/reports/monitoring/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.net/reports/monitoring/reports/ D13 New management strategies. To see the report select: http://www.demohouse.net/reports/monitoring/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.net/reports/monitoring/reports/ D13 New management strategies. To see the report select: http://www.demohouse.net/reports/monitoring/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.net/reports/monitoring/reports/ D13 New management strategies. To see the report select: http://www.demohouse.net/reports/monitoring/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.net/reports/monitoring/reports/ D13 New management strategies. To see the report select: http://www.demohouse.net/reports/monitoring/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.net/reports/monitoring/reports/ Demohouse Renovations Lessons learned