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Appl. Sci. 2018, 8(9), 1605;

NZEB Renovation Definition in a Heating Dominated Climate: Case Study of Poland

The Faculty of Civil Engineering, Warsaw University of Technology, Lecha Kaczyńskiego 16, Warsaw 00-637, Poland
The Building Research Institute, Ksawerów 21, Warsaw 02-656, Poland
Author to whom correspondence should be addressed.
Received: 7 August 2018 / Revised: 28 August 2018 / Accepted: 3 September 2018 / Published: 10 September 2018
(This article belongs to the Special Issue Zero-Energy Buildings)
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The main objective of this article is to propose possible requirements for NZEB (nearly zero-energy buildings) renovation definition in heating dominated climate. A survey was carried out on potential approaches and indicators that could be used for the NZEB definition of existing single-family houses in Poland. The process of determining requirements for the NZEB renovation definition was divided into two stages. The cost-optimal U-values of the building’s envelope were initially calculated and, based on them, the energy demand for heating (QH) and the reduction of non-renewable primary energy demand (QP) were estimated. The calculations were made for different energy prices, locations, and two building models. Based on them the requirements for cost-optimal renovation (QH ≤ 60 kWh/(m² year), QP reduction ≥ 75%) and NZEB renovation (QH ≤ 40 kWh/(m² year), QP reduction ≥ 80%) were proposed. In contrast to definitions using only a maximum level of QP, two indicators were used. Such a solution is appropriate for existing buildings because it prevents the situation in which only renewable energy sources (RES) (with a low primary energy factor) will be applied in order to decrease the primary, non-renewable energy demand. View Full-Text
Keywords: NZEB renovation; cost-optimal; single family house NZEB renovation; cost-optimal; single family house

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Firląg, S.; Piasecki, M. NZEB Renovation Definition in a Heating Dominated Climate: Case Study of Poland. Appl. Sci. 2018, 8, 1605.

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