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Building renovation measures to improve the thermal performance of dwellings with the aim to arrive at a net-zero energy building are most commonly based on consumption figures for gas (or oil) and electricity. However, whilst the use of energy labels for buildings solely target the thermal performance of a dwelling, the consumption figures are distorted by the building occupants and the efficiency of the installed HVAC equipment. In the worst case, the selected renovation measures reduce the energy consumption for the current user but do not improve the (thermal) performance of the building in the long term. This means that consumption figures are not always the most suitable data-source to formulate a renovation strategy.
Renovation strategies can best be derived based on the comparison of costs and impact of different design alternatives. There is a great number of software tools available, see for example the IBPSA tool directory, for supporting the comparison of different designs. However, those tools require input with respect to the thermal characteristics of the building fabric, for example the thermal resistance of the external walls or the airtightness of the building. With the existing building stock that information is hard to come by.
For that reason the authors of the paper propose and document the application of an blower-door test in combination of a co-heating test a typical residential dwelling in Enschede (NL). As a result of those tests the infiltration rate and total heat-loss coefficient for the dwelling are determined and used to provide a realistic reference for the comparison of different design alternatives. The resulting renovation strategy thereby targets the improvement of the thermal performance and realistically contributes to achieving a future proof net-zero energy building.
Topic Area: [1.9] Energy (renewable – non-renewable) Abstract Type: Oral Presentation and paper in IJSDIR
Academic: No Data Provider: No Data User: No INSPIRE Implementer (IT): No INSPIRE newbies: No Policy Officers: No Public Administration (MS/Regional/Local): No Thematic specialists: Yes Other_theme: energy & location Comments: energy labels, existing residential building stock, model validation, model parametrization, co-heating test
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