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 ...

This paper aims at studying a trigeneration system, based on an internal combustion engine and a steam ejector refrigeration system. The designed cycle is to generate cooling and heating energies, and supply power simultaneously. The cycle is studied from thermodynamics point of view and for this purpose, the first law of thermodynamics is applied to all components of the cycle. The efficiency ...

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...

Abstract: Naval surface ships should use thermally driven heating and cooling technologies to continue the Navy’s leadership role in protecting the marine environment. Steam ejector refrigeration (SER) or steam ejector heat pump (SEHP) systems are thermally driven heating and cooling technologies and seem to be a promising technology to reduce emissions for heating and cooling on board naval su...

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...

In the case of R744 refrigeration technology, system equipped with a two-phase ejector is one most efficient systems, allowing utilisation an R744-based unit in hot and tropical climates. However, experimental analyses ejector-based have only been performed for performance evaluation, mapping ejectors or validation numerical simulation. Therefore, main goal/scope this paper to enhance knowledge...

Low temperature cold chain is the top priority of logistics development at this stage. CO2 (carbon dioxide) refrigeration system widely used. However, low efficiency biggest obstacle to its development. In research work, EES (Engineering equation solver) used simulate system, which in thermodynamic modeling and calculation, a novel trans-critical cycle with ejector for low-temperature storage p...