NUMERICAL MODELING OF LIGHTING HVAC INTERACTION IN ENCLOSURES - PART I - LIGHT AND HEAT-TRANSFER IN A ROOM/

A numerical model based on heat transfer equations was developed for t he dynamic simulation of a room with lamps in luminaires as the only p ower source. The model was used to consider heat transfer by conductio n, convection and radiation between surfaces in the luminaire, the ple num space and the room space. Also, it was used to calculate temperatu res, cooling loads, and lighting levels at each time step. It was desi gned to be flexible so that different room configurations could be sim ulated. The main differences between this model and previous models in the literature are that, firstly, this model does not assume that som e nodes are massless; secondly, it calculates illuminance on room surf aces; and thirdly, a fluorescent lamp positive column model can be inc orporated at a later stage for improved simulation of lighting levels for a room; these differences represent an improvement on similar exis ting models. The present model was validated, using the experimental r esults reported by Treado and Bean (1988, 1992), and using further exp erimental measurements obtained from a laboratory-constructed test cel l. Further validation was conducted using the numerical test cell deve loped by Sowell (1990). Results predicted by the model agreed well wit h experimental results from both the NIST test cell and the laboratory test cell. The incorporation of a fluorescent lamp positive column mo del is presented in Part II.