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residential buildings. The AIIR partners are INCERC, UTCB, UPT (AIIR – INCERC - National Building Research Institute; UTCB - Technical University for Civil Engineering, UPT - “Politehnica” University from Timisoara). For residential buildings, the calculations can be performed by hand or on a spreadsheet, using defaults values, databases of materials, construction details etc.

National databases of hourly annual typical climates are to be prepared and published for every municipality in Romania.

A special theoretical and experimental validation research program of new and existing calculation methods is currently being carried out coordinated by MDLPL (2008 – 2010). Within the research program, a reference software (RS) will be performed. Based on this RS and on a special checklist of results any alternative method and software product (Romanian or foreigner) will be assessed. It is our intention to also use certified software products in the design activity. The actual regulations for new buildings are limited to conventional buildings and some new and efficient solutions are omitted (e.g. solar passive systems, active solar systems, endothermal facades, phase change storage structures, etc.). A simulation software using unsteady state thermal response of the envelope and of the HVAC systems will provide compatible solutions for increasing building energy performance.

There are requirements for new buildings, major renovations and existing buildings.

The energy certificate is compulsory for new buildings from 1 January 2007. The type and level of requirements depend on the type of building (dwellings, office buildings, schools, etc.) and cover, for the new buildings: › Minimum thermal resistance corrected with thermal bridges R’ - value › Maximum thermal transmittance corrected with thermal bridges U’- value;

› Maximum overall thermal coefficients G-values.

The proof of compliance must be made in two stages: › when requesting the building permit; › and after completion of the building.

Control of the regulation is the responsibility of both the accredited experts registered in the Building Certification System who verify the design, as well as the Municipality where the building is located.

For existing buildings, the real building is compared with a reference building having the same values for the envelope units and thermal resistance values provided in the table below (corrected thermal resistance is the actual value of thermal resistance of a finite dimensions façade affected by linear and punctual thermal bridges. Neglecting this type of correction of so called “field resistance”, produces very significant errors – more than 15% - in the final energy demand of a building). If the upgrading of an existing building is performed, a combined technical and economical assessment is made. The values of energy performance and economic assessment are the result of Romanian Methodology application. The final solution depends on the user’s decision and is based on investments cost, energy consumption reduction and pay back time value compared with the maximum accepted value of 10 years and conventional life time of the technical solution.

EPBD Buildings Platform > P079_EN_Romania-May 2008

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