Performance degradation of a vapor compression refrigeration system under fouled conditions

Performance degradation due to fouling in a vapor compression cycle is investigated for various applications. Considering the first set of refrigerants i.e. R134a, R410A and R407C, from a first law standpoint, the COP indicates that R134a always performs better unless only the evaporator is being fo...

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Bibliographic Details
Published in:International journal of refrigeration 2011-06, Vol.34 (4), p.1016-1027
Main Authors: Qureshi, Bilal Ahmed, Zubair, Syed M.
Format: Article
Language:English
Subjects:
Applied sciences
Compression de vapeur
Degradation
Devices using thermal energy
Détérioration
Encrassement
Energy
Energy. Thermal use of fuels
Engines and turbines
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fouling
Froid
Heat exchangers (included heat transformers, condensers, cooling towers)
R134a
R290
R404A
R407C
R410A
R717
Refrigerants
Refrigerating engineering
Refrigerating engineering. Cryogenics. Food conservation
Refrigeration
Vapour compression
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Summary:Performance degradation due to fouling in a vapor compression cycle is investigated for various applications. Considering the first set of refrigerants i.e. R134a, R410A and R407C, from a first law standpoint, the COP indicates that R134a always performs better unless only the evaporator is being fouled. In contrast to this, from a second-law standpoint, the second-law efficiency indicates that R134a performs the best in all cases. Considering the second set of refrigerants i.e. R717, R404A and R290, from a first law standpoint, the COP indicates that R717 always performs better unless only the evaporator is being fouled. In contrast to this, from a second-law standpoint, the second-law efficiency indicates that R717 performs the best in all cases. Volumetric efficiency of R410A and R717 remained the highest under the respective conditions studied. Furthermore, performance degradation of the evaporator often has a larger effect on compressor power requirement while that of the condenser has an overall larger effect on the COP. A new performance degradation law is presented in light of the data generated, which can reduce the amount of experimentation and help predict relevant quantities of the refrigeration system.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2011.02.012