37º IAHS World Congress on Housing: - Universidad de Cantabria

XXXVII <strong>IAHS</strong><strong>World</strong> <strong>Congress</strong> on HousingOctober 26 – 29, 2010, Santander, SpainCODE: 253ENERGY SURVEYS FOR SUSTAINABLE RETROFIT OFEXISTING RESIDENTIAL BUILDINGSGiuseppe Desogusi, Luciano Mareddui, Salvatore Muraii, Roberto Ricciuii, Valeria Saiui,Antonello SannaiiDepartment of ArchitectureiiDepartment of Mechanical EngineeringUniversity of Cagliarie-mail: gdesogus@unica.itKey words: existing residential buildings, survey of energy performance, thermal and environmentalmeasurements, sustainable retrofit.AbstractDirective 2002/91/EC made energy certification for buildings compulsory in every EUmember state.To provide valid certification it is fundamental to assess the energy performance of new andexisting buildings. In the latter case, the assessment is necessary also to foresee all possibleretrofit strategies.To carry out a correct survey it is indispensable to measure the performances of opaque andtransparent components of the envelope, consumptions of HVAC services and the evaluationof thermal comfort inside the buildings.For these reasons, the authors have developed a methodology for energy surveys of existingbuildings and experimented it in several test cases for over a year. The methodology includesthe use of instruments such as heat flux meters, IR cameras and microclimatic data loggers.To reach this goal, it was first necessary to adapt international measurement standards toMediterranean climatic conditions (especially for the measures of thermal transmittance).Then a survey method was set up and tested on several existing residential buildings. Thestudy cases were chosen basically from among traditional Sardinian houses made of earthbricks and more recent lowcost housing.The outcome of the research is firstly the proposal of an integrated assessment method forenergy performances of residential buildings, one that includes the use of differentmeasurement instruments, and which is the basis for correct certification. The research is alsothe starting point from which to propose different examples of possible retrofitting strategieson existing buildings, both traditional and modern, and their economic advantages.37º <strong>IAHS</strong> <strong>World</strong> <strong>Congress</strong> On Housing Science 144