Product(s):	OpenBuildings Energy Simulator
	Version(s):	CONNECT Edition
	Environment:	N/A
	Area:	Part L
	Subarea:	N/A

Overview 

Typically rooms are entered using the internal edge of room surfaces. However the NCM Modelling Guide requires the floor area to be calculated to the centreline of internal partitions.

Method

The Centre line option (under the General > Other tab) caters for tracing rooms using either:

• • Partition Centre lines

Or

• • Internal partition edges

Care should be taken in selecting the correct method as this will have implications on room areas.

• If partitions have been drawn using Centre lines, selecting this option will prevent adjustment to floor areas
  
  
• If partitions have been drawn to the inside edge of partitions, then this option should remain unticked so that floor areas are adjusted to allow for the half-width of the partition.