<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=big5"> <META content="MSHTML 6.00.2900.3157" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Dear all,</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I have a look at the types of glass and optical properties of the double-glazing (6-12-6mm) in ESP-r database and have a few questions.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>The absorptions at the external and internal clear float glass layers are taken from DCF7671_06nb, which appear to be:</FONT></DIV> <DIV><FONT face=Arial size=2>0.157 0.172 0.185 0.201 0.202</FONT></DIV> <DIV><FONT face=Arial size=2>0.117 0.124 0.127 0.112 0.077</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>1) Why are these values be so different, given the internal and external have the same thickness (both are 6mm thick)?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>2) What are the type of glass used for double glazing? In construction database, plate glass has been used for the double-glazed windows; however, the optical properties are for clear float glass with vis transmittance of 0.76.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Regards,</FONT></DIV> <DIV><FONT face=Arial size=2>Wong</FONT></DIV></BODY></HTML>