Objective . With the decreasing use of refrigerants with a high global warming potential, increasing efficiency refrigeration machines using natural working fluids is very urgent task. The CO2 booster refrigerant cycle may be optimal for fields commercial refrigeration, climate engineering and heat pumps, but needs to adapted regions hot climates. purpose study also systematize possible ways im...

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...

Recently Debates about Energy and the issue of global warming have led to the use of new energy. One of the best options for this purpose is the use of a new hybrid system of power, heating and refrigeration, with its thermal source of solar and geothermal energy. In the present study, used a combined cooling, heating and power system based on the organic Rankine cycle and the Ejector Refrigera...

Natural gas is often associated with nitrogen and heavy compounds. The Heavy components in the natural gas not only can feed downstream units, owing to the low temperature process may be formed solid as well. Therefore, heavy components separation can be a necessity and produce useful products. Virtually, all natural gases are containing nitrogen ​​that would lower the heating value of natural ...

More and more attention has been paid to ejector refrigeration system using low grade thermal for cooling. Ejector is the most important part of this system, its operating condition structure are two parameters affecting performance, especially NXP value a hot research topic at present. The optimal was found by many experimental or numerical studies, but theory about how design an optimum nozzl...

Optimization of a High-Efficiency Jet Ejector by Computational Fluid Dynamics Software. (May 2005) Somsak Watanawanavet, B.S., Chulalongkorn University Co-Chairs of Advisory Committee: Dr. Mark T. Holtzapple Dr. Charles J. Glover Research was performed to optimize high-efficiency jet ejector geometry (Holtzapple, 2001) by varying nozzle diameter ratios from 0.03 to 0.21, and motive velocities f...

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...