Simulated thermal energy demand and actual energy consumption in refurbished and non-refurbished buildings

7th International Conference on Advanced Concepts in Mechanical Engineering

Ilie, C.A.^1 ; Visa, I.^1 ; Duta, A.^1

RandD Centre: Renewable Energy Systems and Recycling Centre, Transilvania University of Brasov, Brasov, Romania^1

关键词: Building performance;    Construction solutions;    Domestic hot water;    Low energy buildings;    Renewable energy systems;    Single-family house;    Solar thermal systems;    Worst case scenario;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/147/1/012136/pdf
DOI  :  10.1088/1757-899X/147/1/012136

来源: IOP

【 摘 要 】

The EU legal frame imposes the Nearly Zero Energy Buildings (nZEB) status to any new public building starting with January 1st, 2019 and for any other new building starting with 2021. Basically, nZEB represents a Low Energy Building (LEB) that covers more than half of the energy demand by using renewable energy systems installed on or close to it. Thus, two steps have to be followed in developing nZEB: (1) reaching the LEB status through state- of-the art architectural and construction solutions (for the new buildings) or through refurbishing for the already existent buildings, followed by (2) implementing renewables; in Romania, over 65% of the energy demand in a building is directly linked to heating, domestic hot water (DHW), and - in certain areas - for cooling. Thus, effort should be directed to reduce the thermal energy demand to be further covered by using clean and affordable systems: solar- thermal systems, heat pumps, biomass, etc. or their hybrid combinations. Obviously this demand is influenced by the onsite climatic profile and by the building performance. An almost worst case scenario is approached in the paper, considering a community implemented in a mountain area, with cold and long winters and mild summers (Odorheiul Secuiesc city, Harghita county, Romania). Three representative types of buildings are analysed: multi-family households (in blocks of flats), single-family houses and administrative buildings. For the first two types, old and refurbished buildings were comparatively discussed.