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**u values ...W/M2/K**

I am getting confused by the definition of the u-value .

I want to do some calculations for heat loss but I do not understand the timescale for the U- value calcs

I understand that a U value describes the energy in watts that is lost per Sq Mtr for each degree (K) diferential , but is that per hour , day ,year ?

I may have missed something obvious but any advice would be gratefully accepted

Kev