Assessing the Actual Performance of Green Buildings in Palestine: A Case Study
الحضيري, حاتم غالب حسن
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There is evidence indicates that buildings often do not perform as expected in terms of energy and water consumption. Nowadays, this issue is becoming one of the main topics that is being discussed and studied with increasing attention. The main aim of this research is to assess the actual economic performance of the first green school in Palestine, which is Aqqaba Green School, in terms of energy and water consumption, then, to quantify the actual energy and water saving compared to other schools in Palestine. This research also aims to investigate whether the actual performance of the green school meets the anticipated performance in the design simulation or not. A performance measurement baseline was established using data collected from actual energy and water consumption reports, as well as actual energy and water costs for a sample consists of 205 governmental schools in West Bank for the year 2016. The data of annual energy and water consumption were ordered in an ascending order, then, five number summary analysis was applied to calculate interquartile ranges and interquartile intervals which allows excluding the outliers and hence reduce the variation between the data, then, the mean value of the remained data was calculated and considered as the baseline. It is statistically found that the baseline of the annual energy consumption of schools in the sample is 10,639 kWh/year which corresponds to a building energy index (BEI) of 9.56 kWh/m²/year, while the annual energy consumption of the green school is 10,124 kWh/year, which corresponds to a building energy index (BEI) of 7.19 kWh/m²/year. It is found that, in its first year of operation, the green school has generated more energy than its consumption by 4,426 kWh/year which yields an annual income of 2,297 ILS/year. In term of water consumption, it is found that the baseline of annual water consumption of schools in West Bank in Palestine is around 450 m³/year which corresponds to 1.25 m³/student/year, while the annual water consumption of the green school is 460 m³/year, which corresponds 2.95 m³/Student/year. It is also found that the actual energy performance of Aqqaba Green School is 7.19 kWh/m²/year in its first year of operation, which corresponds to 11.79 % of the anticipated performance in the design simulation which is around 61 kWh/m²/year. As a conclusion, the actual energy performance of the green school in its first year of operation is much lower than the predicted consumption in the design stage, while the actual energy performance of the Green School was close to the developed baselines.