ISHS Acta Horticulturae 711: V International Symposium on Artificial Lighting in Horticulture
LIGHT INTERCEPTION OF LIGHTING SYSTEMS, VENLO AND WIDE SPAN TYPE GREENHOUSES |
| Authors: | E. Janssen, H. Hart |
| Keywords: | Light interception, Venlo type greenhouses, artificial lighting |
| Abstract:
TNO has developed a computer program to calculate the light interception of the greenhouse structure using an improved half-perimeter method, taking into account reflections and shadowing. This program is used to compare the light interception of Venlo and Wide span type greenhouse. Furthermore the influence of artificial lighting on the total light interception is considered. The objective is to minimize the light interception of the greenhouse structure (with and without lighting equipment). The computer program is widely used by greenhouse construction companies and suppliers to improve the light interception of their greenhouses. The theory is also implemented in the Dutch Greenlabel programme, to stimulate energy efficient greenhouses. The program is used to compare several common types of the Venlo greenhouse type. The following parameters are varied: bay width, glass panel width, vent size, gutter type and light intensity level of the lighting system. The total range of light interception is about 7 % (difference between maximum and minimum light interception of the greenhouse including lighting system). The range of the lighting system is 3% Concluded is that a 4 meter bay width together with 1,67 meter glass panels is the most favorable Venlo greenhouse type. Integration of the lighting system with the structure can improve the light interception with 0,7% | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
