Experimental investigation on the performance and global environmental impact of a refrigeration system retrofitted with alternative refrigerants

Antunes, Augusto Celso; Filho, Ênio Pedone Bandarra

doi:10.1016/j.ijrefrig.2016.06.027

Cited by 42 publications

(18 citation statements)

References 9 publications

(3 reference statements)

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“…Theoretical different evaporator temperatures. In this investigation, refrigerants tested were R22, R32, R438A, R404A, R410A, R290 and R1270 [13]. Test results shown that COP of R290 and R1270 was better than R22 and other investigated refrigerants.…”

Section: Introductionmentioning

confidence: 92%

Thermodynamic Analysis of Window Air Conditioner Using Sustainable Refrigerant R290/RE170 and R1270/RE170 Blends as Substitutes to Refrigerant R22

Shaik¹,

Setty²

2019

IJHT

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The present work emphasis on theoretical computation of thermodynamic performance of window air conditioner using various sustainable R290/RE170 and R1270/RE170 refrigerant mixtures as substitutes to R22. In this work, apart from R407C, twelve new binary mixtures comprising of R290, R1270 and RE170 at various compositions were developed. And also in this investigation, a MATLAB code was developed to compute the thermodynamic performance characteristics of various considered R22 alternatives at Tk=54.4 0 C and Te=7.2 0 C. The various performance characteristics computed are mass flow rate, refrigeration effect, compressor work, coefficient of performance (COP), pressure ratio, compressor discharge temperature, power consumed per ton of refrigeration, condenser heat rejection and volumetric cooling capacity. Results showed that the COP of refrigerant mixture RM7 (R1270/RE170 95/5 by mass %) was the highest among twelve refrigerants studied and it was 0.23 % higher than R22. Pressure ratio of RM7 (3.174) was 7.49 % lower than that of R22 (3.431). Compressor discharge temperature of all the twelve investigated refrigerants was lower in the range of 9.35 0 C to 17.15 0 C when compared with R22. Power consumed per ton of refrigeration of RM7 was 0.27 % lower than that of R22. Volumetric cooling capacity of RM7 (3833 kJ/m 3) was very close to that of R22 volumetric capacity (3863 kJ/m 3). Heat transfer through condenser of RM7 (6.372 kW) was similar to that of R22 (6.377 kW). Overall, thermodynamic performance of RM7 matches well with the performance of base line refrigerant R22 and hence, refrigerant RM7 can be considered as sustainable alternative to R22 used in air conditioners.

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Section: Introductionmentioning

confidence: 92%

Thermodynamic Analysis of Window Air Conditioner Using Sustainable Refrigerant R290/RE170 and R1270/RE170 Blends as Substitutes to Refrigerant R22

Shaik¹,

Setty²

2019

IJHT

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“…11 Meng et al reported that the coefficient of performance (COP) of mixture refrigerant R1234ze(E)/R152a (50/50 mass %) was 3% higher when compared to base line candidate R134a. 12 Antunes and Bandarra Filho 13 carried out an experimental study on vapour compression system with various alternative refrigerants. 13 Results revealed that the performance of R290 and R1270 was better than that of R22.…”

Section: Introductionmentioning

confidence: 99%

Theoretical energy performance assessment and environmental impact of various new ozone-friendly refrigerants used in residential air conditioners

Shaik

Babu

2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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This study focuses on energy performance investigation and environmental impact analysis of various new ecofriendly refrigerant blends as alternatives to high global warming potential refrigerant R22 theoretically. In this study, 23 refrigerants were considered at various composition. The present work considered the practical vapour compression refrigeration cycle for the performance assessment of various R22 alternatives. Essential studies such as toxicity, flammability, and total equivalent warming index of various novel refrigerants were also conducted in this study. Results obtained from practical vapour compression refrigeration cycle revealed that the energy efficiency ratio of refrigerants such as R1270 (2.860) and RB03 (R290/R152a of 60/40 in mass %) (2.854) was closer to the energy efficiency ratio of R22 (2.940). Volumetric refrigeration capacity (VRC) of R1270 (3293 kJ/m3) was similar to that of R22 (3297 kJ/m3) whereas VRC of RB03 (2908 kJ/m3) was almost similar to that of R407C (2925 kJ/m3) which was an alternative to R22. Compressor discharge temperature of RB03 was 15.78 ℃ lower when compared to R22. Flammability study revealed that all the new refrigerant blends (RB01 to RB04) were classified into weakly flammable (A2) and flammable (A3) category refrigerants whereas toxicity study revealed that all the investigated refrigerants were classified into non-toxic group (A). Refrigerant blend RB03 was less flammable compared to R1270. Total equivalent warming index analysis revealed that the environmental impact of R422A was 27.88% higher than R22 whereas RB03 has 4.97% lower environmental impact compared to R22. Overall, performance of refrigerant blend RB03 was better compared to 23 investigated refrigerants and it was very nearer to the performance of R22 and hence, it could be considered as an ecofriendly alternative to replace high global warming potential refrigerant R22 used in air conditioners.

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“…3. Some researchers have done worked on vapour compression refrigeration system to improve the performance of the system [3][4][5][6][7][8][9] and also investigated alternative refrigerants [10][11][12][13] which should be environmental friendly in terms of ozone depletion potential and global warming potential [14][15][16][17][18]. Thermodynamic analyses on vapour compression refrigeration system by designed computer software have been done with consideration of internal irreversibility, and the performance analyses on the refrigeration system have also been done with alternative refrigerants and found COPs, work inputs, second law efficiencies at different operating conditions [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Entropy generation and exergy destruction analyses for vapour compression refrigeration system with various refrigerants

2019

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In this experimental work, entropy generation minimization and exergy destruction minimization concepts have been applied on vapour compression refrigeration system. For that, entropy generations and exergy destructions have been found for each component of vapour compression refrigeration system; compressor, condenser, expansion device and evaporator, and also for whole system at different time intervals with various refrigerants. Refrigerants R134a, R600a, 95%R134a + 5%R290, 90%R134a + 10%R290, 85%R134a + 15%R290 and 85%R134a + 15%R152a blend refrigerants have been chosen for this experimental research work. Percentages increments/decrements for the entropy generations and exergy destructions have also been calculated to find best conditions and refrigerant, with developed computer software which eliminate hectic calculations and human mistakes. Minimum entropy generation (i.e. 533.64 J/kgK) and exergy destruction (i.e. 160090.8 J/kg) for the system have been found for R134a, and componentwise least entropy generations and exergy destructions have also been obtained with R134a but it affects environment. After this experimental work, 85%R134a + 15%R290 blend or R600a refrigerants have been recommended for refrigeration systems because of least percentage increments for entropy generation and exergy destruction. R134a as refrigerant is generally used in the refrigerating systems but it has high global warming potential (1430 GWP), so it should be replaced by alternative ecofriendly refrigerant and R600a is favourable which has zero ozone depletion potential and least global worming potential.

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Experimental investigation on the performance and global environmental impact of a refrigeration system retrofitted with alternative refrigerants

Cited by 42 publications

References 9 publications

Thermodynamic Analysis of Window Air Conditioner Using Sustainable Refrigerant R290/RE170 and R1270/RE170 Blends as Substitutes to Refrigerant R22

Thermodynamic Analysis of Window Air Conditioner Using Sustainable Refrigerant R290/RE170 and R1270/RE170 Blends as Substitutes to Refrigerant R22

Theoretical energy performance assessment and environmental impact of various new ozone-friendly refrigerants used in residential air conditioners

Entropy generation and exergy destruction analyses for vapour compression refrigeration system with various refrigerants

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