A Thermal Modelling Comparison of Typical （热造型比较典型的）.pdf

Dow Corning PROPRIETARY Dow Corning® Dow Corning® A Thermal Modelling Comparison A Thermal Modelling Comparison of Typical Curtain Wall Systems of Typical Curtain Wall Systems Dow Corning PROPRIETARY Introduction Today’s Aim • To understand the meaning of a ‘U’ value and window energy ratings • Discuss the drivers for energy efficiency in Europe Today’s Objective • Outline the study details of generic curtain wall systems • Review the study results and discuss how this affects energy efficiency Today’s Outcome • Provide a greater insight into how system choice can affect energy consumption Dow Corning PROPRIETARY Agenda • What is a ‘U’ value? • What are window energy ratings and how are they communicated? • Drivers for energy efficiency in Europe • Compare the U façade value of typical curtain wall systems used in commercial construction • Compare energy usage of typical curtain wall systems • Summary and conclusion • Question answer session Dow Corning PROPRIETARY What is a ‘U’ Value? • A ‘U’ value is a measurement that represents the ability of a window assembly to resist heat transfer • The ‘U’ value is the overall heat transfer coefficient – a measure of how thermally efficient an installation is • The lower the ‘U’ value, the more efficient the installation Dow Corning PROPRIETARY What is Window Energy Rating? • U value: heat losses and gains from