How do you calculate u-values? please help i really need to get the d i am aiming for

Geoff Hurst

dont aim for D aim for a C. :-).
plus here is a link to a website that could help you with working out u-values:
http://www.ccfltd.co.uk/Trade-Support/Calculating_U_Values

Patrick Scott

the u value equal to the rate of heat transfer divided by the area and difference in temperature, hope this is useful.

sebastian jiang