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...

We report the construction of an optically accessible flow test section made of quartz to simulate carbon dioxide flow through throttling devices in refrigeration systems. The existence of traces of lubricant oil (specifically Polyolester (POE)) in the working medium makes the flow amenable to Laser Induced Fluorescence (LIF) diagnostics. The molecular structure of these lubricants is rich in c...

This study presents a thermodynamic model for determining the entrainment ratio and double choke limiting pressure of supersonic ejectors within the context of heat driven refrigeration cycles, with and without droplet injection, at the constant area section of the device. Input data include the inlet operating conditions and key geometry parameters (primary throat, mixing section and diffuser ...

A novel multigeneration system using dual renewable energy sources (i.e., geothermal and solar) is introduced, analyzed, optimized. The integration of a line, solar tower, steam Rankine cycle, two organic cycles, an ejector refrigeration thermoelectric generator unit, reverse osmosis subsystem forms the entire system. outputs this energy-conversion are heating load, cooling electricity, freshwa...

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 eva...

Background. Currently, in the cycles of steam-ejector refrigeration machines (SERM) are used monoagent jet compressors, working body which is water. Despite their low efficiency, SERM have a number advantages over that usemechanical compressors: cost, ease manufacture and reliability. The use largely limited by inability these installations to reach temperatures below 0 °C. This limitation can ...

This study presents a thermodynamic analysis of new combined power/refrigeration cycle. The cycle is comprised two innovative cycles: Kalina (KNC) and ejector refrigeration (ERC) for power production, respectively. Recovery heat process involved in the design to rise energetic exergetic efficiencies: emitted by KNC absorbed ERC order generate cooling. Effects variation operational conditions wh...