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 use of a binary cycle coupled to the complete reinjection non-condensable gases could provide valid answer improvement sustainability geothermal plants. In recent years, interest in CO2 as working fluid transcritical cycles has increased. However, low critical temperature carbon dioxide (?30 °C) requires cooling cycle, temperatures below 15 °C, which are not always available. this work, ove...

Ever since the renaissance of transcritical R744 systems in the late 1980s, ejectors have been considered to improve energy efficiencies. However, the invention of the ejector dates back far longer. This review paper gives an overview of historical and recent developments regarding air-conditioning and refrigeration systems that use ejectors. More than 150 ejector papers available in the open l...

Abstract CO2 systems used in refrigeration are becoming more complex with the aim of improving their energy performance. Parallel compression is one implemented solutions to enhance performance plants. However, an optimization process required operate this system at high and its operation subjected physical limitations real This work presents experimental a transcritical plant working parallel ...

The objective of the present work is investigation a novel polygeneration system for power, refrigeration and heating production at two temperature levels. uses CO2 as working fluid, which an environmentally friendly fluid. total configuration combination transcritical cycle coupled to Brayton with recompression, fed by biomass boiler. examined system, nominal operating conditions, produces 5 °...

The stable operation of a system is restricted by the intrinsic characteristics, namely harmonious matching among and between structure parameters and operation parameters. In this paper, we put forward an analysis method of the dynamic stability of the refrigeration system based on the First Approximation Theory of Lyapunov Stability Theorem and the evaluation of stability margin. It is carrie...