building wall insulation calc

huangyhg

building wall insulation calc
does anyone know of a calc (even approximate) in which i can calculate the heat flow and/or insulation value across a composite wall if i have the following parameters?
ambient air temperature inside
inside wall temperature
outside wall temperature
ambient wall temperature outside
any help would be appreciated.
ron frend
tel: 011 44 1253 400541
american society of heating, refrigerating and air-conditioning engineers (ashrae) manuals and books cover this subject very well. i also would recommend mark's handbook.