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Open AccessArticle

Enhancement of a R-410A Reclamation Process Using Various Heat-Pump-Assisted Distillation Configurations

1
School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Korea
2
OunR2tech Co., Ltd, Pohang 37553, Korea
*
Author to whom correspondence should be addressed.
These two authors contributed equally to this work.
Energies 2019, 12(19), 3776; https://doi.org/10.3390/en12193776
Received: 15 September 2019 / Revised: 25 September 2019 / Accepted: 2 October 2019 / Published: 4 October 2019
(This article belongs to the Special Issue Refrigeration Systems and Applications)
Distillation for R-410A reclamation from a waste refrigerant is an energy-intensive process. Thus, various heat pump configurations were proposed to enhance the energy efficiency of existing conventional distillation columns for separating R-410A and R-22. One new heat pump configuration combining a vapor compression (VC) heat pump with cold water and hot water cycles was suggested for easy operation and control. Both advantages and disadvantages of each heat pump configuration were also evaluated. The results showed that the mechanical vapor recompression heat pump with top vapor superheating saved up to 29.5%, 100.0%, and 10.5% of the energy required in the condenser duty, reboiler duty, and operating cost, respectively, compared to a classical heat pump system, and 85.2%, 100.0%, and 60.8%, respectively, compared to the existing conventional column. In addition, this work demonstrated that the operating pressure of a VC heat pump could be lower than that of the existing distillation column, allowing for an increase in capacity of up to 20%. In addition, replacing the throttle valve with a hydraulic turbine showed isentropic expansion can decrease the operating cost by up to 20.9% as compared to the new heat pump configuration without a hydraulic turbine. Furthermore, the reduction in carbon dioxide emission was investigated to assess the environmental impact of all proposed sequences. View Full-Text
Keywords: distillation; heat pump; hydraulic turbine; refrigerant reclamation; R-410A; superheating distillation; heat pump; hydraulic turbine; refrigerant reclamation; R-410A; superheating
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MDPI and ACS Style

Long, N.V.D.; Han, T.H.; Lee, D.Y.; Park, S.Y.; Hwang, B.B.; Lee, M. Enhancement of a R-410A Reclamation Process Using Various Heat-Pump-Assisted Distillation Configurations. Energies 2019, 12, 3776.

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