Possibilities for energy rehabilitation of typical single family house in Belgrade—Case study

• Three retrofit scenarios for a typical model building and respective sample building analyzed.
• Sample building energy performance and characteristics correspond to the model building.
• All three analyzed retrofit scenarios lead to significant energy savings, up to 80%.
• Surface to volume ratio and ratio of thermal envelope to external and unheated area investigated.
• Third retrofit scenario could result in an immediate payback, providing impetus for refurbishment.

This paper presents a case study of refurbishment and energy efficiency upgrade of a family house in Belgrade, which can be considered, based on the National typology of residential buildings, to be one of the most common Serbian family housing types. Having in mind real life conditions regarding budget, occupant behavior, spatial comfort, functional and structural characteristics, this study discusses the envisioned levels of energy efficiency improvements as defined in the National typology and their correlation to the executed retrofit case. Focus of the work is primarily energy performance of the building and it has been evaluated based on the comparison of energy needed for heating between various scenario models calculated according to methodology in current Serbian regulations on energy efficiency of buildings. Functional, volumetric, site specific and structural characteristics relevant for building's energy performance are analyzed, summed up and discussed. Following the completion of the refurbishment, a post construction evaluation has been performed taking into account real energy performance (utility bills) and economic aspects of the intervention. Significance of the case study has been discussed in terms of impact of conducted retrofit case on the respective family housing building type as well as overall impact on whole building stock.