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Energy efficiency of the built environment greatly depends on the performance of the insulating materials used in the building envelope construction. Vacuum insulation panels (VIPs) offer excellent thermal resistance properties that can enhance the energy efficiency of the insulating systems and provide savings in energy consumption. However, VIP systems are virtually unknown and rarely used for building construction. There is a need to investigate the use of VIPs in various components of building envelopes (walls – roofs) and their long-term function and performance. 1. ENERGY EFFICIENCY Energy Efficiency is the capacity to produce results with a minimum overall expenditure of energy, human effort, materials and capital. Because the cost and availability of these resources differ, efficiency is relative to time and place. This means that countries have different perspective and limitations on efficiency, but share the same aim of minimizing expenditure of resources for the tasks at hand [1]. Energy efficiency is the capacity to produce results with a minimum expenditure of energy inputs. Waste energy is any energy in a system which is not directly serving the systems function. A system is thought of energy-efficient if its requirements are low in relation to the results produced, and if energy is not wasted [2].  1 Architecture and Urban Planning Department, Faculty of Engineering, Port Said University, Port Said, Egypt, E-mail: whitehouse.egy51@yahoo.com 2 Architecture and Urban Planning Department, Faculty of Engineering, Port Said University, Port Said, Egypt, E-mail: elmokadem1@gmail.com 3 Architecture and Urban Planning Department, Faculty of Engineering, Port Said University, Port Said, Egypt, E-mail: abosamranoha@yahoo.com 2. VACUUM INSULATION PANELS (VIP) And thus, we can define energy efficiency as "the ability to provide the best results at the lowest possible energy sparingly, without prejudice to the job" Minimum Inputs Energy + Minimum Waste Energy = Energy Efficiency VIP are regarded as one of the most promising high performance thermal insulation solutions on the market today, Thermal performances five to ten times better than conventional insulation of the same thickness. 2.1. Definition of VIPs A vacuum insulation panel is composed of two components: a microto nanoporous material called the "core" that is evacuated, and sealed using a thin membrane called the "foil" [3]. Vacuum insulation panels are defined as: "An evacuated foil-encapsulated open porous material as a high performance thermal insulating material" [4]. 2.2. Components of VIPs VIP has three major components [5]:  Core Material: imparts mechanical strength and thermal insulating capacity by preventing the free flow PORT SAID ENGINEERING RESEARCH JOURNAL Faculty of Engineering Port Said University Volume 18 No. 1 March 2014 pp: 171 179 Figure (1): Energy efficiency cheaper than new energy (Cost for various GHG measures in 2030) Source: Anne Grete Hestnes and Marit Thyholt, Zero Emission Buildings (ZEB), The Research Centre on Zero Emission Buildings, February 2009, www.zeb.no Figure (2): schematic representation of a vacuum insulation panel Source: Mukhopadhyaya, P., High-performance insulation materials , National Research, Council Canada, September 2004.

Improve Energy Efficiency through Nano Pore Vacuum Insulation Panels "Vips"