M.Sc Student | Levy Esther |
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Subject | Development of Simulation and Calculation Method for the |

Department | Department of Architecture and Town Planning |

Supervisor | Mr. Eliyahu Ne'eman (Deceased) |

Computer software has been written in order to facilitate and expedite design in various fields of building, including lighting. A number of computer programs exist for calculating lighting level in interior spaces, each with its limitations and advantages.

The following work presents a computer program for a quick and flexible design of electric lighting. The proposed calculation method makes use of the information provided in most manufacturers’ catalogs, and thus is independent of the software provided by the manufacturer. This advantage is achieved at the cost of possible accuracy. However, it has been found that the approximation method which was incorporated, assures an acceptable low degree of error.

- The software deals with three types of
luminaires:
- Symmetric luminaire with a variable beam axis.
- Symmetric luminaire with fixed beam axis.
- Luminaire with two planes of symmetry perpendicular to cads other, passing through the beam axis.

- The software deals with two types of
planes:
- Planes parallel to the planes of the coordinates.
- Planes perpendicular to the planes of the coordinates.

For the above mentioned planes, it is
possible to calculate illuminances for a given space using a single or a
combination of several luminaires listed above.

In order to incorporate a luminaire into
the computer program, its polar light intensity diagram should be known. These
diagrams are published by the manufacturers in their luminaire catalogs. Thus,
the necessary photometric data is readily available, and it does not required
to obtain manufacturers’ classified data or request these data from a testing
laboratory.

Results obtained by the suggested program
were compared with calculated data applying programs of various manufacturers
for the same luminaires. The results obtained were very close, justifying the
method of calculation and form of data entry to the program.