Session

Energy Efficiency Engineering

Description

The indiscriminate exploitation of the planet's energy sources has nowadays led to an uncontrolled form of climate change, with negative consequences for both humankind and the environment. In an effort to curb this situation, energy savings in both the building sector and other sectors of activity (industry, transport, etc.) is a primary objective and an indispensable component of any energy policy been planned today all around the world. As the building sector consumes 40% of the energy required at European level, the European Union (EU) has made considerable efforts to significantly reduce these consumption levels. In recent years, the European Union’s efforts have been made to improve the situation in energy policy and planning issues, focusing on energy saving as well as the use of renewable energy sources that have proven to have significant benefits for the environment, society and the economy. The European Council adopted a package and the European Parliament voted it and the 27 Heads of State and governments finally agreed to implement the 20-20-20 EU Energy targets: by 2020, reduce by 20% the emissions of greenhouse gases, increase by 20% the energy efficiency in the EU and to reach 20% of renewable energy sources (RES) in total energy consumption in the EU.It is characteristic that in the context of saving efforts in the building sector, provisions have been incorporated into the requirements of net Zero Energy Buildings (nZEB)both in the corresponding Community Directives. These provisions provide for the construction of all new buildings by 2021 at the latest with net zero consumption standards. In particular for public new buildings, the time horizon is even shorter. These targets difficult will be met.In this paper a review of definitions and methodologies of nZEB will be presented. It also examines the possibility of integrating two different systems of solar energy utilization into a residential building in the Patras area in order to achieve its energy self-sufficiency and hence its classification in the category of Zero Energy Consumption Buildings. More specifically, the integration of both photovoltaic and hybrid photovoltaic - thermal collectors was examined. The mathematical model for this proposed hybrid energy system is presented and analyzed. Examining these systems against other RES technologies was preferred because of their easier integration in building infrastructure but also the greater familiarity that users of the buildings usually have with both photovoltaic and solar thermal systems. The modeling of the operation of the two systems was done using the Matlab programming environment, taking into account the relevant literature and data available from manufacturers of related equipment. Different formats were developed to model the two technologies due to the different mathematical equations governing the operation of each of the proposed systems. Modeling took place for four representative months of the year (January, April, July and October) in the Western part of Greece. Obtained simulation results which have been very promising will be presented at the conference.

Session Chair

Peter P. Groumpos

Session Co-Chair

Ines Bula

Proceedings Editor

Edmond Hajrizi

ISBN

978-9951-437-61-5

First Page

55

Last Page

59

Location

Durres, Albania

Start Date

27-10-2017 3:00 PM

End Date

27-10-2017 4:30 PM

DOI

10.33107/ubt-ic.2017.136

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Oct 27th, 3:00 PM Oct 27th, 4:30 PM

An Overview of Zero Energy Buildings with an Emphasis on Energy Savings

Durres, Albania

The indiscriminate exploitation of the planet's energy sources has nowadays led to an uncontrolled form of climate change, with negative consequences for both humankind and the environment. In an effort to curb this situation, energy savings in both the building sector and other sectors of activity (industry, transport, etc.) is a primary objective and an indispensable component of any energy policy been planned today all around the world. As the building sector consumes 40% of the energy required at European level, the European Union (EU) has made considerable efforts to significantly reduce these consumption levels. In recent years, the European Union’s efforts have been made to improve the situation in energy policy and planning issues, focusing on energy saving as well as the use of renewable energy sources that have proven to have significant benefits for the environment, society and the economy. The European Council adopted a package and the European Parliament voted it and the 27 Heads of State and governments finally agreed to implement the 20-20-20 EU Energy targets: by 2020, reduce by 20% the emissions of greenhouse gases, increase by 20% the energy efficiency in the EU and to reach 20% of renewable energy sources (RES) in total energy consumption in the EU.It is characteristic that in the context of saving efforts in the building sector, provisions have been incorporated into the requirements of net Zero Energy Buildings (nZEB)both in the corresponding Community Directives. These provisions provide for the construction of all new buildings by 2021 at the latest with net zero consumption standards. In particular for public new buildings, the time horizon is even shorter. These targets difficult will be met.In this paper a review of definitions and methodologies of nZEB will be presented. It also examines the possibility of integrating two different systems of solar energy utilization into a residential building in the Patras area in order to achieve its energy self-sufficiency and hence its classification in the category of Zero Energy Consumption Buildings. More specifically, the integration of both photovoltaic and hybrid photovoltaic - thermal collectors was examined. The mathematical model for this proposed hybrid energy system is presented and analyzed. Examining these systems against other RES technologies was preferred because of their easier integration in building infrastructure but also the greater familiarity that users of the buildings usually have with both photovoltaic and solar thermal systems. The modeling of the operation of the two systems was done using the Matlab programming environment, taking into account the relevant literature and data available from manufacturers of related equipment. Different formats were developed to model the two technologies due to the different mathematical equations governing the operation of each of the proposed systems. Modeling took place for four representative months of the year (January, April, July and October) in the Western part of Greece. Obtained simulation results which have been very promising will be presented at the conference.