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In this research paper, an overview of energy reduction methods around the world in commercial buildings was investigated, to find out the best solution for minimizing electricity demand of Al-Ahliyya Amman University (AAU). Those methods are renewable energy technologies mainly wind and photovoltaics (PV) system using either conventional or Carbon Nanotubes panels, building envelope system mainly dynamic Insulation materials and cool roof coating and National country system mainly demand response program and energy consumption ration. According to the overview, the best-promised method solution to achieve the target of saving, reducing investment cost and carbon emissions in AAU is the Standalone Hybrid Carbon Nanotubes PV system. This method was compared with the existing on-grid PV system project applied in AAU. The comparison was based on investment cost, payback period and solar cell efficiency. The comparison analysis results revealed that Standalone Carbon Nanotube PV system was able to save 21.12% of the investment cost when compared to the existing AAU project with a reduced payback period from 10 to 8 years and Internal Rate of Return (IRR) of 16%.

Comparing Between Best Energy Efficient Techniques Worldwide with Existing Solution Implemented in Al-Ahliyya Amman University