Ben Guehza, M. L.Kaabi, A.2020-10-082020-10-082010-01-01Articale in Journal of fundamental and Applied Sciences Vol. 02 N. 011112-9867http://dspace.univ-eloued.dz/handle/123456789/7100Articale in Journal of fundamental and Applied Sciences Vol. 02 N. 01The work presented in this paper is a contribution to the theoretical study of the impact of space between the protective glass and the glass through the performance of a solar plan double glazing. Under the climatic conditions in the region of Ouargla Algeria. The study was carried out using a mathematical model obtained by writing the laws of conservation of energy in the system. Type of day June 15, 2008 at Ouargla. To simplify the system of equations of energy, we use the finite difference method with an implicit scheme. The algebraic system obtained and solved by the iterative Gauss Seidel, the program is inscribe FORTRAN. We also took into account the variation of the angle of incidence and refraction of solar radiation in terms of time and its influence on the coefficients of transmission, reflection and absorption.frcollector solar, doubles glazing, space, performanceArticle