Abstract
The goal of decarbonizing the building stock in the EU requires a multi-fold increase of the current renovation rates. In Estonia, the non-residential building sector has had little or no public support to improve the energy efficiency. Therefore, it is essential to study the energy efficient and cost-optimal measures for non-residential building renovation to give guidance to real estate companies and other stakeholders about the renovation alternatives. Furthermore, crucial is to provide input to the government to develop the renovation grant and incentives for renovation. In this study, energy renovation measures and savings to improve the energy performance to NZEB level were identified in a large (16 990 m2heated area) office building. For that purpose, energy use was measured, simulation model developed and calibrated, feasible and more comprehensive energy improvements and costs analysed. The improvement of lighting, AHU, heating, installation of a 69 kW PV system, and window replacement was needed to achieve the goal with a primary energy use of 163 kWh/m2. However, some of the applied measures had long payback times of 40-70 years and are not realistic to be implemented without renovation incentives.
Highlights
European Union (EU) has a goal to develop a sustainable, competitive, secure, and decarbonised energy system in EU Member States by 2050
Energy use of a building is evaluated with the energy performance certificate (EPC) that indicates the EP of a building calculated by a methodology adopted in accordance with Directive 2010/31/EU [3]
The idea is to give an overview of the measured energy consumption and analyse the energy renovation measures to improve the energy performance of NZEB major renovation in office buildings
Summary
European Union (EU) has a goal to develop a sustainable, competitive, secure, and decarbonised energy system in EU Member States by 2050. The electricity for other uses than energy performance of buildings (non-EPB) (e.g., small power plug loads, commercial activities, elevators, industrial kitchen) should be excluded from calculation. As shown in [4] and [11], today major electricity uses in the office are not. Estonian long-term renovation strategy states that today the annual PE use is 225-270 kWh/m2 (delivered heating 130 kWh/m2 and electricity 70 kWh/m2) in office buildings constructed before 2000. To achieve the major renovation NZEB level (class C in Table 1), the PE for an office building should be 136160 kWh/m2 (delivered heating 70 kWh/m2, electricity 45 kWh/m2). Today building stock has several barriers that prevent to achieve the NZEB level renovation. The idea is to give an overview of the measured energy consumption and analyse the energy renovation measures to improve the energy performance of NZEB major renovation in office buildings
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