Energy Optimization of an Existing Residential Villa in UAE Towards Net Zero Energy Building (NZEB) Concept

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The British University in Dubai (BUiD)
Buildings energy contributes in one third of the world’s consumed energy. The use of fossil fuels to provide buildings energy contributes in the Global Warming phenomenon. To reduce the buildings impact on world’s energy, concepts like net zero energy buildings were introduced. This study was conducted to test the possibility of achieving such concept in the UAE. A two-story existing residential building was selected to apply energy saving measures and introduce renewable energy solutions to it with the aim of achieving a NZEB villa. Simulating the implementation of passive energy saving measures, efficient lighting and efficient HVAC systems reduced the energy massively, the remaining required electricity was provided by using PV panels. The study concluded that using external U-value of 0.29 W/m2K, Roof U-value of 0.14 W/m2K and Windows U-value of 1.61 W/m2K together with Dubai Lamp bulbs reduced the energy by 59.04% in the case of using VRV HVAC system. The same measures used with connecting the villa to a district cooling plant and the energy reduction was simulated as 84.06% of the total energy without considering chillers energy at source, 57.72% of the total energy when considering the chillers energy. The introduction of 49 PV panels with nominal efficiency of 20.6% was able to cover the remaining energy required by the villa for the VRV HVAC case. The district cooling connected case required using 19 PV panels when the chillers energy was not considered, and 51 panels considering the chillers energy. The net zero energy building concept was achieved for both options and was able to upgrade the existing villa in UAE to become a NZEB.
energy optimization, residential villa, Net Zero Energy Building (NZEB), United Arab Emirates (UAE)