When mould remediation becomes energy efficiency renovation

1. Whenmouldremediationbecomesenergyefficiency renovation Anna Küller, Josefin Thoresson, Departmentofthematic studie, technology and social change, Linköping University Linn Liu, Division ofenergy systems, Linköping University

2. Outline • Background • Introductionof the studyobject • Aim • Methodology • Results • Conclusion • Future studies

3. Background • Residential buildings and service sector represent 39% of Sweden's total primary energy use. • The national energygoalreduce 20% untill 2020, 50% untill 2050. • By renovation the energyusageofbuildingscan be lowered and this is ofgreatimportancetoachieveof the nationalgoal.

4. Introductiontothe studyobject-I

5. Introductionto the studyobject-II • All the buildingswerebuiltduring1979-1980 • Municipal house company Stångåstaden. • Building 23 wasundergone a major renovation during 2009-2010. • Building 51 wasalsorenovatedbut in a much simple level.

6. Building Aimof the study Building as an energy system • Howhave the energyissuesbeenintroduced and handled in the process? • How has energyusagebeenchangedafter the renovation? • Indoor thermalcomfortaccordingto simulation and questionnaire. • How do the tenantsthinkabout the renovation and energyissues? • Whichchallangesdoes the next renovation projecthave? Tenants Decision makers

7. Method • Case study • Qualitative interview:11 decision makers; 11 tenants from bothrenovated(23 & 51) and unenovatedbuildings. • Simulation: IDA ICE 4.0 • Questionnaire

8. Application of the two methods • Questionnaire: • An orderd questionnaire which is called “My indoorclimate”-”Min boendesmiljö” • The questionnaires were sent out to some renovated buildings and also unrenovated buildings. • The response rate was 53%. • The questionnaireincludesquestionsaboutthe indoorclimateof the house, itstemperature, noise situation and air quality. • Simulation: Two apartments are simulated • The results include: heat demand during the year • Electricity usage per month • PMV and PPD • How will the heat demand and electricity use be affected when a common laundry room built instead of individual laundry rooms? • How do the energy saving appliances affect the house holds’ heat demand and electricity use during every month?

9. Results Simulation • The average of annual heat demand is 40kWh/m2/yr. The averageof the annualelectricitydemand is 18kWh/m2/yr. • The PMV values of those two different apartments are all at around -0,5~0,5 which give a very good indication of thermal indoor climate. • Instead of having a commenlaudry room, the electricity demand will be reduced of about 510- 750 kWh/yr for the households but the heating demand will be highered for about 0.5 kWh/m2/yr. • The class A household appliances will reduce the household electricity demand but also cause a higher heating demand. Questionnaire • Comparisons of answers between different buildings. • Renovated VS Not Renovated • Exempel: • The tenants from building23 are more satisfied with the indoor climate than from other buildings. When it comes to the thermal indoor climate the questionnaire results has confirmed the simulation result which is the building 23s indoor climate has improved because of the renovation.

10. Future works • Winter period measurements will be started during January 2012. • The model will be built completely. • Comparison of the energy use parameters between the renovated building and one of the old buildings. The results will be at the building level. • LCC is also planed to be adapted on the next stage.

11. Thankyou for your attention!