[EXTERNAL] Abstract: Review of Ejector Design- Refrigeration and Air Conditioning

In this paper, a thermodynamic model of the ejector-expansion transcritical CO2 refrigeration cycle is developed.The basic transcritical CO2 systems exhibit low energy efficiency due to their large throttling loss. Replacing the throttle valve with an ejector is an effective measure for recovering some of the energy lost in the expansion process.  The effect of the suction nozzle pressure drop (SNPD) on the cycle performance is discussed. The results indicate that the SNPD has little impact on entrainment ratio. There exists an optimum SNPD which gives a maximum recovered pressure and COP under a specified condition. The value of the optimum SNPD mainly depends on the efficiencies of the motive nozzle and the suction nozzle, but it is essentially independent of evaporating temperature and gas cooler outlet temperature.

Courtesy of B.ELHUB,MOHAMED AZLY ABDUL AZIZ, MOHD KHAIRUL ANUAR BIN SHRIF SOHIF MAT, Solar energy research institute (SERI) UniversitiKebangsaan Malaysia UKM 43600 UKM, Bangi Selangor, MALAYSIA

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