A Developed CRMC Design Method and Numerical Modeling for the Ejector Component in the Steam Jet Heat Pumps

Abstract

Steam jet heat pump is one kind of high energy efficiency heating supplying device. In this system, ejector is an essential component determining the system operating performance. Our work features the advanced ejector design with developed constant rate of momentum change (CRMC) method based on the real properties of working fluid, and the flow friction loss is also considered, which results in a higher thermal compression effect more accurately. With the validated mathematical models, we compare the performances of the designed ejectors using different design methods. The results show a promoted ejector entrainment ratio up to 0.59 with the CRMC method. Furthermore, the variations of the designed entrainment ratio with the change of provided ejector working conditions are analyzed. At last, for the purposed to verify the correct and advantages of the CRMC model, the numerical modeling for operating condition with the specific construction CRMC ejector is also conducted. A more stable and more efficient performance is shown in the modeling results.