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TITLE : GREEN BUILDING ENVELOPE DESIGN BY TRADE-OFF METHOD-AN OVERVIEW AND A CASE STUDY  
ABSTRACT :

Building consumes considerable amount of energy and leaves 'carbon foot prints'. In ancient days, zero energy materials like stone, soil, thatch / leaves and unprocessed timbers were used in construction, whereas, considerable amount of energy is being utilized for the production of modern materials. The envelope of a building transmit solar infrared rays inside buildings and cause discomfort to the occupants which inturn requires considerable energy for enhancing the comforts of occupants to the desired level. Use of low thermal resistance materials (ie less U-factor) in construction industry will provide not only comfortability but also save energy. In this contexts, various design approaches in green buildings is helpful to the Engineers, Architects in the planning and construction of energy- efficient buildings. This paper highlights the use of various thermal resistance materials, and the various approaches in the design of green buildings. A simple case study is presented to show the steps used in the design of green buildings by the trade-off method and to highlight the usefulness and flexibility of the method.

Keywords: Green Building, Thermal resistance, Thermal conductivity, Trade-off method, Building envelope. 
 
 
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