An experimental investigation of refrigerant mixture R32/R290 as drop-in replacement for HFC410A in household air conditioners

Tian, Qiqi; Cai, Dehua; Ren, Lijun; Tang, Wenjun; Xie, Yuanfei; He, Guogeng; Liu, Feng

doi:10.1016/j.ijrefrig.2015.05.005

Cited by 73 publications

(39 citation statements)

References 24 publications

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“…In this work, a MATLAB program was developed to evaluate the thermodynamic performance characteristics of various considered R22 alternatives. The results obtained from the MATLAB program were compared with the Qiqi Tian et al results available in the literature [30]. Qiqi Tian et al computed the performance characteristics of binary blend R290/R32 (32/68 by wt %) at condenser and evaporator temperatures of 54.4 o C (Tk) and 7.2 o C (Te) respectively, by taking subcooling and superheating as 5 o C. For validation, same fluid and operating conditions were used in the program as that of Qiqi Tian et al The deviation of program results when compared with Qiqi Tian et al is below 2% and it is shown in Table 15.…”

Section: Validation Of Resultsmentioning

confidence: 99%

Thermodynamic performance analysis and flammability study of various new ozone friendly non azeotropic refrigerant mixtures as alternatives to replace R22 used in residential air conditioners

Shaik¹,

Babu²

2018

IJHT

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The present study investigates the theoretical thermodynamic performance analysis and flammability study of various new ozone friendly refrigerants as replacements to R22. In this work, five non azeotropic refrigerant blends comprising of R152a, R134a, R32, R290 and R1270, at various compositions were developed. Flammability study of all the five refrigerant mixtures considered were carried out by using Refrigerant Flammability (RF) number. The cycle followed during the performance investigation of refrigerants was the actual vapour compression refrigeration cycle. Thermodynamic performance characteristics of all the five investigated refrigerants were compared with the baseline refrigerant R22. Theoretical results showed that COP of refrigerant M40 was 0.51% higher, compared to R22 and the five refrigerants studied. Compressor discharge temperature of M40 was lowered by 11.6 0 C compared to R22. Power consumed to produce per ton of refrigeration of M40 was 0.52% lower, compared to R22 and the five refrigerants considered. Heat transfer rate through the condenser for M40 was 3.66% higher than R22. Volumetric refrigeration capacity of M40 was the highest among the five studied refrigerants and it was very close to the volumetric capacity of R22. Flammability analysis revealed that all the five investigated refrigerant mixtures were classified into the weakly flammable category. Overall, the thermodynamic performance of new ternary blend M40 (R32/R134a/R1270 5/60/35 by mass percentage) was higher than R22 with reasonable saving in power consumption and hence, M40 is a viable candidate to replace R22.

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Section: Validation Of Resultsmentioning

confidence: 99%

Thermodynamic performance analysis and flammability study of various new ozone friendly non azeotropic refrigerant mixtures as alternatives to replace R22 used in residential air conditioners

Shaik¹,

Babu²

2018

IJHT

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“…In a transcritical cycle, the mixture operates with a high COPh and volumetric heating capacity superior to those of R125 and R744. Tian et al [69] also proposed an R32/R290 (68/32%) mixture to replace R410A in RACs. The amount of refrigerant charge is [30,35]% lower than that of R410A, and the use of microchannel heat exchangers reaches a 34.1% lower charge and 6.8% higher COPc compared to typical heat exchangers.…”

Section: R32 Pure and Mixtures As Alternatives To R410amentioning

confidence: 99%

Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA

Mota-Babiloni

Navarro-Esbrí

Makhnatch

et al. 2017

Renewable and Sustainable Energy Reviews

110

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Because air conditioning and heat pump systems contribute greatly to greenhouse gas emissions, equipment with both lower global warming potential (GWP) working fluids and a higher level of performance should be used. R32 (difluoromethane) has been proposed to substitute R410A, particularly in residential air conditioning (RAC) systems. This study collected the most relevant and recent researches into R32 as a refrigerant so as to assess its viability in RAC systems in both Europe and the USA, as compared to R410A and other lower GWP RAC alternatives.The R32 value of GWP is 677, which is below the F-gas regulation limit in RAC equipment (750). According to ASHRAE standard 34, R32 is less flammable than hydrocarbons, and the amount of charge permitted for R32 is above the necessary level in RAC equipment. It can be concluded that R32 has significantly good heat transfer characteristics and a level of performance that make it acceptable at low condensing temperatures, thereby avoiding overly high compressor discharge temperatures. Its performance is very similar to that of R410A across the entire operating range, and it is therefore believed that R32 will be utilized in RAC systems in the remaining countries that prioritize lower GWP fluids but are less strict in their security regulations.To replace R410A under extreme conditions, some system modifications can be conducted, or R32 mixtures with hydrofluoroolefins (HFOs) can be used. Such mixtures achieve a lower performance than R32, but are acceptable replacements when considering their lower GWP compared to that of R32, and similar level of flammability. Finally, other (R32-based) alternative mixtures have also been developed and their behaviours studied under a wide range of operating conditions.

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“…Tian et al conducted an experimental study with flammable refrigerant mixture R32/R290 (68/32 by wt %) as a drop-in substitute to R410A used in household air conditioners. 16 Results revealed that, the COP of the mixture (R32/R290 68/32 by wt %) was closer to that of R410A. Padalkar et al performed experiments with R290 (Propane) as a substitute to R22 used in split air conditioner.…”

Section: Introductionmentioning

confidence: 97%

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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An experimental investigation of refrigerant mixture R32/R290 as drop-in replacement for HFC410A in household air conditioners

Cited by 73 publications

References 24 publications

Thermodynamic performance analysis and flammability study of various new ozone friendly non azeotropic refrigerant mixtures as alternatives to replace R22 used in residential air conditioners

Thermodynamic performance analysis and flammability study of various new ozone friendly non azeotropic refrigerant mixtures as alternatives to replace R22 used in residential air conditioners

Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA

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

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