Ejector-based refrigeration systems can make direct use of many forms thermal energy, such as solar thermal, waste heat, biogas, or natural gas. The present paper describes the estimation coefficient performance (COP) a binary fluid ejector ground source heat pump (BFE GSHP) cooling system. A method for selection was defined based on favorable thermo-physical properties working fluids. short li...

The performance characteristics of an ejector-expansion refrigeration cycle (EEC) using R32 have been investigated in comparison with that using R134a. The coefficient of performance (COP), the exergy destruction, the exergy efficiency and the suction nozzle pressure drop (SNPD) are discussed. The results show that the application of an ejector instead of a throttle valve in R32 cycle decreases...

The adverse effects of global warming and climate change require critical measures for marine refrigeration technology because its impact on greenhouse gas emissions. A novel transcritical CO2 two-stage compression/ejector cycle shipboard cold chamber is proposed in this research. comparative analysis was conducted between the basic compression equipped with a two-phase ejector considering coef...

the purpose of this research is to investigate thermoeconomic optimization and exergy analysis of transcritical co2 refrigeration cycle with an ejector. after modeling thermodynamic equations of elements and considering optimization parameters of emerging temperature of gas of cooler (tgc) , emerging pressure of cooler's gas (pgc) , and evaporative temperature (tevp) , optimization of targ...

Abstract The large-scale deployment of ejector refrigeration systems (i.e., solar-based systems), although representing a promising alternative compared with mechanical compressor ones, is hindered due to limitations regarding control modes. Indeed, ejectors are fluid-dynamics controlled devices and, because their fixed geometry, they operate at highest efficiency in narrow range operating cond...

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. In this paper, a thermodynamic model of the ejector-expansion transcritical CO2 refrigeration cycle is developed. The effect of the suction nozzle pressure drop ...

The energy crisis in recent years has led to the use of thermodynamic cycles that work based on renewable energies. Low-temperature cycles—such as organic cycles—are suitable strategies for the application of renewable energies. The present study proposes a novel cycle through the integration of a two-stage compression refrigeration cycle with a combined Rankine power and ejector refrigerat...