Window Positions & Luminaire Data

 

 

Details for each window position should be entered on a separate line. You must enter all values for the first window, but subsequent windows will default to the last value entered.

 

Warning Limits:           1 to 4

Error Limits:                 1 to 4

 

The wall number specifies in which wall the window is located. Walls 1 and 3 refer to LENGTH and Walls 2 and 4 refer to WIDTH.

 

Units:                           m

Default:                        as last window

Warning Limits:           0.10 to 2.00

Error Limits:                 0.01 to L or W

 

The window width and height refer to the size of the glass, excluding the frame. The default values are those of the previously defined window.

 

Units:                           m

Default:                        as last window

Warning Limits:           0.10 to 2.00

Error Limits:                 0.01 to HT

 

The window height refers to the height of the glass excluding the frame. If more than one window is entered with the same height, the second and subsequent values for window height may be left blank and the program will use the value for the first window as a default.

 

Units:                           m

Warning Limits:           0.00 to L or W

Error Limits:                 0.00 to L or W

 

The window position is measured from either the wall-1 datum or the wall-2 datum, whichever is appropriate, to the centre of the window.

 

Units:                           m

Default:                        as last window

Warning Limits:           WSH to HT-WHT

Error Limits:                 WSH to HT-WHT

 

The window-sill height is measured from the floor to the bottom of the window. This value should be greater than the working-surface height. The default value is that of the previously defined window.

 

Default:                        0.9

Warning Limits:           0.4 to 0.9

Error Limits:                 0.0 to 1.7

 

The light-transmission factor is the proportion of the total luminous flux transmitted by the window to the total flux incident upon it. For energy savings calculations, these factors can be multiplied by the diffuse orientation factor to take into account building-facade orientation.

 

 

A list of light-transmission factors for typical types of windows is shown in Appendix A, Table 7.

 

 

 

The luminaire reference should be a unique reference up to 8 characters in length. If this reference is a repeat of one already existing in the system database then the user-defined one will be picked up in preference.

 

 

The luminaire category is a form of classification, so that particular types of luminaire can be reviewed more easily; you may enter up to two categories. The following use categories exist:

 

 

The manufacturers category is the second form of luminaire classification so that the review procedure can be used more easily. The manufacturer is represented by a two-character code. The following codes exist, but any two-character code can be used:

 

 

Default : Linear

 

The luminaire type defines the type of lighting source and determines the calculation methods to be used by the program. Luminaire types are as follows:

 

·       P = point source

·       U = uplighter

·       L = linear

 

 

Units:                           m

Default:                        0.0

Warning Limits:           0.0 to 0.3

Error Limits:                 0.0 to 1.0

 

The luminaire height is used to calculate the default luminaire side and end areas which are used in the detailed glare calculations.

 

This switch is used to indicate whether the luminaire in question is still being manufactured. You should enter Y if it is, N if it is not.

 

The luminaire title can be up to 60 characters long. It should adequately describe the luminaire in terms of manufacturer's name and reference and also type of fitting and light control.

 

Warning Limits:           0.0 to 0.95

Error Limits:                 0.0 to 1.00

The ratio of the total light output of a luminaire above the horizontal under stated practical conditions to that of the lamp or lamps under reference conditions.

 

Warning Limits:           0.0 to 0.95

Error Limits:                 0.0 to 1.00

 

The ratio of the total light output of a luminaire below the horizontal under stated practical conditions to that of the lamp or lamps under reference conditions.

 

Warning Limits:           0.1 to 2.0

Error Limits:                 0.0 to 4.0

 

This ratio describes the distance between luminaire centres in relation to their height above the working plane. The maximum spacing-to-height value should not be exceeded if the uniformity of illuminance is to be acceptable for general lighting.

 

Warning Limits:           0.1 to 2.0

Error Limits:                 0.0 to 4.0

 

The transverse spacing-to-height ratio ensures that spacing in the transverse direction provides the illuminance uniformity.

 

Warning Limits:           0.10 to 0.95

Error Limits:                 0.00 to 1.00

 

The utilisation factor is the proportion of luminous flux emitted by the lamps which reach the working plane.

 

The utilisation factors should be for zero reflectances for the nominal space-to-height ratio at the standard room indices, as described in CIBSE TM5. Nine values should be entered in ascending order, to correspond to room indices of 0.75, 1.0, 1.25, 1.5, 2.0, 2.5, 3.0, 4.0, and 5.0.

 

Warning Limits:           2.0 to 30.0

Error Limits:                 -10.0 to 50.0

 

The uncorrected crosswise glare indices should be entered for each of the nineteen standard-room dimensions, as described in CIBSE TM10. The indices entered should be for ceiling, wall and floor reflectances of 70%, 50% and 20% respectively.

 

Warning Limits:           2.0 to 30.0

Error Limits:                 -10.0 to 50.0

 

The uncorrected endwise glare indices should be entered for each of the nineteen standard-room dimensions, as described in CIBSE TM10. The indices entered should be for ceiling, wall and floor reflectances of 70%, 50% and 20% respectively. The endwise value should follow the corresponding crosswise value for each room dimension; if the endwise glare index is not entered its value will default to that of the crosswise glare index.