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This paper describes an experimental study of a steam-ejector refrigerator using an ejector with a primary nozzle that could be moved axially within the mixing chamber section. The effects on coefficient of performance and cooling capacity produced by adjusting the position of the nozzle were studied. The experimental rig and method are described and results are presented which clearly show the benefit of using such a primary nozzle.Cet article decrit l'etude experimentale d'un refrigerateur a ejection de vapeur utilisant un ejecteur a buse primaire qui peut se deplacer dans l'axe de la chambroe de melange. On a etudie les effets de la position de la buse sur le COP et la puissance frigorifique. On decrit le banc d'essai et la methode; on presente les resultats qui mettent en evidence les avantages de l'utilisation d'un tel systeme.