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Ben Gurion University of the Negev (2014)

Assessment of potential energy savings in Israel through climate-aware residential building design

Weisthal, Morel

Titre : Assessment of potential energy savings in Israel through climate-aware residential building design

Auteur : Weisthal, Morel

Université de soutenance : Ben Gurion University of the Negev

Grade : Master of Science (MS) 2014

Résumé
Energy usage is growing in most regions of the world, alongside population growth and development processes that are intended to improve standards of living. However, given basic resources limitations and negative impacts on the environment, present energy consumption trends are unsustainable. Buildings consume a significant proportion of primary energy. Worldwide about 30% of energy is channeled into the residential sector (IEA, 2006 ; Griffith, 2007). Many studies indicate that increasing efficiency through building design can feasibly yield significant energy savings, and realizing this potential through bio-climatic design has been widely scrutinized at the scale of the individual building. At the same time, there is a lack of quantitative research assessing the potential for energy savings through climateconscious building design at a national scale, and this is considered to be one of the obstacles preventing a wider implementation of bio-climatic design in many countries. This study focuses on Israel, which has not realized its potential for energy conservation through efficient, climate-conscious residential buildings. This is despite the existence of relatively high technological capabilities with regard to solar energy, high awareness which has even been translated into design guidelines and voluntary standards for climate-conscious green building that is adapted to the local conditions in Israel and studies and reports that highlight the potential for energy savings in green buildings. In light of these concerns, this study sets as its main objective to quantitatively assess and predict the potential for energy savings in residential buildings in Israel, hypothetically assuming that newly designed and constructed buildings would be designed according to commonly known and publicized best practices. The objective of this is pursued through a synthesis of multi-scale quantitative assessments and analyses that were carried out in four separate stages : in the first stage, the potential for operational energy savings was estimated on a per-unit basis in buildings, using thermal simulation techniques. This energy savings assessment takes into account four different climate zones in Israel and different residential building typologies common in Israel. The second stage includes an innovative assessment, by using advanced GIS techniques, of the mutual climatic influence among buildings in an urban environment and its influence on the energy consumption in those buildings. The results of this stage are used for refinement of the results obtained in the first stage. In the third stage, spatial analysis techniques and data on current building construction patterns are used to estimate and forecast future rates of residential construction in the different climate zones in Israel. These stages are all used as building blocks for constructing, in the fourth and final stage, a predictive model for estimating the overall potential for energy savings through climate-conscious building design in Israel, as projected for the near future according to three different population growth scenarios. According to this prediction model, in 2035 the energy savings potential in Israel is projected to reach between 1,700 and 3,500 million kWh, and the annual average of savings range between 920 million kWh (low growth scenario) and 1700 million kWh (high growth scenario). These savings are on the order of magnitude of the output generated by a large power plant in Israel, whose construction could theoretically be avoided by realizing these savings. Further, it is shown through the basic thermal simulation analyses that the savings allowed by improved building design approaches 50% when compared with a business-as-usual scenario based on the existing mandatory standard and common practice.

Mots clés : Sustainable buildings — Israel — Energy conservation ; Energy conservation — Economic aspects

Présentation (BGU)

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Page publiée le 4 avril 2015, mise à jour le 26 novembre 2018