Vapour condensation of R22 retrofit substitutes R417A, R422A and R422D on CuNi turbo C tubes

Fernández-Seara, José; Uhía, Francisco J.; Diz, Rubén; Dopazo, Joaquín

doi:10.1016/j.ijrefrig.2009.09.006

Cited by 35 publications

(13 citation statements)

References 24 publications

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“…However, these values changed to be 32.3% and 15.3% at cooling water inlet temperature of 15 °C. Similar results have been observed by Fernández-Seara et al [16] for condensation on CuNi turbo C tubes. They reported that overall condensation HTC for R-417A is lowered by 65-76% than HTCs for R-22.…”

Section: Comparison Between R-22 and R-417asupporting

confidence: 91%

Experimental Evaluation of Condensation Heat Transfer Coefficient of R-417a in Horizontal Tubes

Gendy¹,

Elgendy²,

Mahmoud³

et al. 2016

The International Conference on Applied Mechanics and Mechanica

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In this paper, condensation heat transfer coefficients (HTCs) of R-417A in horizontal smooth and micro-fin tubes under different parameters such as refrigerant saturated vapor temperatures (dew point) (40-60°C), cooling water inlet temperature (15 -30°C), cooling water velocity (0.65 -0.85ms -1 ) have been investigated. Predicted HTCs in smooth tube are within ± 20% as compared with literature correlations for R-22 and R-417A respectively. Condensation HTCs decreased by 58% as the condensation temperature increased from 40 to 60°C at constant water temperature of 25°C. Cooling water inlet temperature has the most significant impact on condensation HTCs where condensation HTCs increased from 1.6 to 5.6 (kWm -2 K -1 ) as the cooling water inlet temperature changed from 15 to 30°C at refrigerant saturated vapor temperature of 40°C. It should be pointed out, condensation HTCs decreased by 32.3% and 15.3% using R-417A as compared with R-22 at saturation temperatures of 40°C and 60°C at cooling water inlet temperature of 15°C.

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Section: Comparison Between R-22 and R-417asupporting

confidence: 91%

Experimental Evaluation of Condensation Heat Transfer Coefficient of R-417a in Horizontal Tubes

Gendy¹,

Elgendy²,

Mahmoud³

et al. 2016

The International Conference on Applied Mechanics and Mechanica

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“…The continuous depletion of the ozone layer, which shields the earth's surface from the biologically damaging ultraviolet sunlight called UV-B radiation, has resulted in a series of international treaties demanding a gradual phase out of CFC and HCFC refrigerants. The CFCs have been phased out in developed countries since 1996, and 2010 in developing countries [6]. Initial alternative to CFCs included some hydro-chlorofluorocarbons (HCFCs), but they will also be phased out internationally by year 2020 and 2030 in developed and developing nations, respectively [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The most promising alternative refrigerants that emerged were R410A, R407C, R134a, and R290. This list has since been revised to include R419A, R404A and R507 [6,15].…”

Section: Introductionmentioning

confidence: 99%

Computational analysis of the performance of ozone-friendly R22 alternative refrigerants in vapour compression air-conditioning systems

Bolaji¹,

Huan²

2012

Environ. Protect. Eng.

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Performance of two ozone-friendly refrigerants (R410A and R419A) was investigated theoretically using computational thermodynamic analysis. The results obtained showed that the performance of R410A was very close to that of R22 in all the operating conditions. Both R22 and R410A performed better than R419A in terms of their COP and refrigerating effect. Compared with R22, the average COP and refrigerating effect of R419A are lower by 13.78 and 33.96%, respectively. Generally, R410A refrigerant has approximately the same performance with R22, therefore, it is considered as a good drop-in substitute for R22 in vapour compression airconditioning system.

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“…Fourth-generation refrigerants are mainly hydrofluoroolefins (HFOs) with low GWP and low capacity [25][26][27]. Therefore, they are refrigerants that are mixed with HFCs [28][29][30], HFOs [31][32][33], and HCs [34][35][36]. Natural refrigerants are low-GWP, zero-ODP, high-capacity, low-pressure, and nontoxic [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Investigation and Analysis of R463A as an Alternative Refrigerant to R404A with Lower Global Warming Potential

et al. 2020

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This research presents the development of R463A refrigerant, a nonflammable refrigerant that was retrofitted to replace R404A. R463A is primarily composed of hydrofluorocarbons/hydrocarbons/carbon dioxide (HFCs/HCs/CO2), and has global-warming potential (GWP) of 1494. It is a nonazeotropic mixture of R32 (36%), R125 (30%), R134a (14%), R1234yf (14%), and R744 (6%). R463A is composed of polyol ester oil (POE), and it is classified as a Class A1 incombustible and nontoxic refrigerant. R463A has a higher cooling capacity (Qe) than that of R404A, as it is composed of hydrofluorocarbons (HFCs) R32 and carbon dioxide (CO2) R744, and has lower GWP than that of R404A due to the use of hydrofluoroolefins (HFOs) from R1234yf. The results of this research showed that R463A can be retrofitted to replace R404A due to its composition of POE, Class A1 incombustibility, and lower toxicity. The properties of R463A and R404A, as analyzed using national institute of standards and technology (NIST) reference fluid thermodynamic and transport properties database (REFPROP) software and NIST vapor compression cycle model accounting for refrigerant thermodynamic and transport properties (CYCLE_D-HX) software, are in accordance with the CAN/ANSI/AHRI540 standards of the Air-Conditioning, Heating, and Refrigeration Institute (AHRI). The normal boiling point of R463A was found to be higher than that of R404A by 23%, with a higher cooling capacity and a 63% lower GWP value than that of R404A. The critical pressure and temperature of R463A were found to be higher than those of R404A; it can be used in a high-ambient-temperature environment, has higher refrigerant and heat-rejection effects, and has lower GWP than that of R404A by 52% due to the HFOs from the R1234yf component. The cooling coefficient of performance (COPc) of R463A was found to be higher than that of R404A by 10% under low-temperature applications. R463A is another refrigerant option that is composed of 7% carbon dioxide (CO2), and is consistent with the evolution of fourth-generation refrigerants that contain a mixture of HFCs, HFOs, HCs, and natural refrigerants, which are required to produce a low-GWP, zero-ozone-depletion-potential (ODP), high-capacity, low-operating-pressure, and nontoxic refrigerant.

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Vapour condensation of R22 retrofit substitutes R417A, R422A and R422D on CuNi turbo C tubes

Cited by 35 publications

References 24 publications

Experimental Evaluation of Condensation Heat Transfer Coefficient of R-417a in Horizontal Tubes

Experimental Evaluation of Condensation Heat Transfer Coefficient of R-417a in Horizontal Tubes

Computational analysis of the performance of ozone-friendly R22 alternative refrigerants in vapour compression air-conditioning systems

Investigation and Analysis of R463A as an Alternative Refrigerant to R404A with Lower Global Warming Potential

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