Analysis and Design of a Steam Ejector Structure
By adjusting structures of the nozzle and mixing-chamber , effects of the structure on the steam ejector performance were analyzed. An improved CFD program which was proved suitable for simulating flow profile in a steam ejector formerly was used here. The results of this study would be useful for designing a steam ejector with high performance when working condition was given.
Analysis of ejector performance using dimensionless parameters
From the ample computational results,the relationships among maximum entrainment ratio,expansion ratio and critical compression ratio were concluded.A power correlation between expansion ratio and Mach number at the nozzle outlet was found.Using two dimensionless parameters,namely expansion ratio and critical compression ratio to replace actual motive fluid pressure — suction pressure and critical discharging pressure to analyze the effect of the operation parameters on the ejector performance,can make the results more universal and useful in ejector designing and ejector efficiency.
Exergy Analysis for the Performance of Solar Collectors
The optimum control and performance evaluation of solar collectors are analyzed from the standpoint of exergy. The pressure drop inside the collector is introduced to the analysis using the Hottel-Whillier model. By treating the friction process as exergy loss, the optimum operating conditions are presented in a simple statement. The maximum capability of collectors is determined and expressed by a relationship among the collector parameters and the environment in which they operate.