PartL NI: Misc Tab

Contains controls used to define or choose default PSI values for all thermal bridges in the model.

Setting

Description

PSI data

Contains controls to use either use default PSI values or enter your own for junctions in all rooms involving metal cladding and non metal cladding. PSI values are a measure of heat loss along a junction between two thermal elements, such as the line between a ground floor and an outer wall. Collectively these junctions are known as "thermal bridging".

Setting	Description
Room	Used to select the rooms for which to assign PSI values.
Use default	When enabled, the default PSI values globally for the selected room.
Junctions involving metal cladding	Lists the junction types involving metal cladding. There is a Use default or a PSI value field for each junction type.
Junctions NOT involving metal cladding	Lists the junction types not involving metal cladding. There is a Use default or a PSI value field for each junction type.

Additional Surface Data

Contains controls used to apply detailed thermal bridge information to individual room surfaces.

Setting

Description

Select surface

Used to select the room surfaces to work with. Clicking the rooms expands the tree to reveal surfaces. When a surface is selected, the options in the rest of the tab are activated.

Thermal bridges

Contains controls used to add or delete thermal bridges to selected room surfaces.

Setting	Description
Add	Adds a new thermal bridge.
Delete	Deletes the selected thermal bridge.
Bridge length	Specifies the length of the thermal bridge.
Psi	Assigns a PSI value to the selected thermal bridge.

Glazing data

The PartL ROI calculation utilises a number of methods for considering shading factors. Contains controls used to manipulate the glazing data on the selected window surfaces.

Setting	Description
Projection ratio	Specifies the ratio between the developed area and the projected area of the window or rooflight.
Frame factor	Specifies the ratio of the window or rooflight area which is occupied by the frame.
Rooflight cover	Specifies the ratio between the area of the floor covered by an array of rooflights to the total area of rooflight glazing.
Aspect ratio	Specifies the ratio of the window's (or rooflight's) height to its width.
Shading position	Specifies the position of the shading device in relation to the window glazing.
Transmission factor	Specifies the shading correction (reduction) factor due to overhangs or fins. In BS EN ISO 13790:2008, it is determined according to section G.5.4.3

Solar collectors

As non-transpired solar collector are structural elements, rather than "add on" elements like the transpired solar collectors, they also need to be defined as a wall construction to the relevant walls.