Thermodynamic optimization of two-stage ejector-vapor compression refrigeration cycles

یاری, مرتضی (2009) Thermodynamic optimization of two-stage ejector-vapor compression refrigeration cycles. University of Mohaghegh Ardabili.

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Abstract

This work presents the first and second laws of thermodynamics analysis for organic Rankine cycles (ORCs), using dry organic fluids as the working fluids. The dry organic fluids for this study were R227ea, RC318, R236fa, Isobutane, R600a, R245fa, HFE7000, R123 and R113. Effects of the operating parameters such as turbine inlet temperature and pressure on the thermal efficiency, exergy destruction rate and second-law efficiency were evaluated. The ORCs studied in this paper were regenerative ORC with IHE, regenerative ORC, ORC with IHE and basic ORC. Organic Rankine cycles were analyzed and compared with basic ORC in order to determine the best configuration that presents the best thermal efficiency with the lowest exergy destruction rate. It was found that, the thermal efficiency values of the regenerative ORC with IHE is on average 30 % higher than that of the basic ORC. It was also concluded that, the exergy destruction rate values of the regenerative ORC with IHE is on average 50 % lower than that of the basic ORC. Thus regenerative ORC produces higher efficiency compared with the basic ORC while also reducing the amount of waste heat required to produce the power with a lower exergy destruction rate. It was also shown that, the R113 has the best performance between the organic fluids, while R227ea shows the worst performance and the fluids with higher boiling point temperatures have the best thermal efficiency and vice versa. Results from these analysis show that regenerative ORC produces higher efficiency compared with the basic ORC while also reducing

Item Type: Other
Persian Title: بهینه سازی ترمودینامیکی سیکل های تیرید دو مرحله ای اجکتور-تراکی
Persian Abstract: -
Subjects: Research Projects
Divisions: Subjects > Faculty of Engineering > Department of Mechanical Engineering
Faculty of Engineering > Department of Mechanical Engineering
Date Deposited: 12 Jun 2019 09:51
Last Modified: 12 Jun 2019 09:51
URI: http://repository.uma.ac.ir/id/eprint/8188

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