GEOMETRICALLY AND THERMALLY NON-OPTIMUM EJECTOR HEAT-PUMP ANALYSIS

A determinate mathematical compressible flow model, which removes two improper assumptions in Elrod's optimum ejector theory and was based o n the control volume approach for a constant area ejector, was formula ted. Through suitable manipulation, the set of governing equations was reduced to a single implicit equation for the primary variable p0. Th e flow parameters of the primary, secondary, mixed and diffused flow c an be calculated directly by using the solved p0. Some empirical data of a heat pump with various ejectors were compared with the predicted values of the present and Elrod's theories. The comparisons show that the present theory gives better agreement than Elrod's predictions. Th e geometrical offset effects in the heat pump analysis were analyzed b y varying the primary, secondary inlets and diffuser exit areas. The o ptimum ejector and the optimum refrigeration system are found numerica lly in this parametric study. The factors which influence the ejector suction capability to the secondary flow can be observed. The thermal offset effects of the boiler, evaporator and condenser are also presen ted in this study.