Steady-state heat loss from a building          
    U-VALUE     m2 in m2 in m2 in m2 in m2 in Heat loss rate    
  ELEMENT W/m2K   zone 1 zone 2 zone 3 zone 4 zone 5 (W/K)    
     Zone volumes (m3)        
              Total heat loss rate W/K  
            (equivalent to kWh per degree day )  
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