کلیدواژهها
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Ejector refrigeration, exergy, coefficient of performance, R141b, experimental work
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چکیده
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The performance of an ejector refrigeration cycle is investigated both theoretically and experimentally. By applying the
equations for the conservation of mass, energy, and momentum as well as that for the exergy balance, for each component in the cycle, a new two-dimensional thermodynamic model is developed. The influence of flow viscosity is taken
into account by assuming a two-dimensional flow near the ejector inner wall. Results indicate that the cycle coefficient of
performance decreases with increasing generator temperature and the second law efficiency increases with increasing
evaporator temperature and/or decreasing generator temperature. It is found that the maximum relative error occurred
in calculating the entrainment ratio is 7.52%. Exergy analysis revealed that the ejector has almost the highest contribution
in the total exergy destruction. In addition, increasing the evaporator temperature from 2 to 15.5 C results in a
decrease in ejector exergy destruction by up to 8%.
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