HFC 134a as a substitute refrigerant for CFC 12

Spauschus, H. O.

doi:10.1016/0140-7007(88)90063-1

Cited by 36 publications

(18 citation statements)

References 10 publications

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“…Sub cooled liquid refrigerant leaving condenser at 43°C (7). High pressure sub cooled liquid entering capillary tube at 32 ℃ (8). Wet mixture leaving Capillary tube at -25 ℃ (9).…”

Section: Theoretical Thermodynamic Analysismentioning

confidence: 99%

“…Interaction coefficients for binary mixtures R12/R152a, R134a/R134 and R22/F152a have been calculated by J.R Sand et al [5] Propane is [6] an attractive alternative regarding its COP, its compatibility with mineral oil, its low cost, availability and its negligible GWP. Concerning the research of new fluids, the majority of previous results [1,[7][8][9][10][11][12] show that R134a is the best possible substitute of R12.It has zero ODP but it is global warming gas, not miscible with mineral oil, its energy efficiency is slightly lower and poor heat transfer at low temperatures. Jung et al [13] performed a computer simulation of domestic refrigerator charged with many pure and mixture as possible alternatives of R12 and studied experimentally R290/ R600a (60/40) and obtained 2.45 % increase in energy efficiency compared to R12.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrocarbons as Alternate Refrigerants to Replace R134a in Domestic Refrigerators

Siddegowda¹,

Sannappagowda²,

Jain³

et al. 2019

RCMA

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The thermodynamic properties of hydrocarbons namely Propane, Cyclopropane, Propene, Methyl acetylene, Propadiene and Dimethyether as alternatives to replace R134a have been predicted using SRK EOS. The values of vapour pressure, liquid specific volume, vapour specific volume, liquid enthalpy, vapour enthalpy, liquid entropy, vapour entropy have been estimated over the temperature range from -250 ℃ to +550 ℃. Simulation of 89W domestic refrigerator is carried out using ten state point vapour compression cycle. The theoretical performances of the hydrocarbons have been comparatively assessed using standard refrigeration parameters. According to our results, Propane, Propene are appropriate and recommended as alternatives of R134a with lower displacement compressor and Cyclopropane as direct substitute. Also implications with respect to material and lubricant oil compatibility, heat transfer characteristics are discussed.

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“…Sub cooled liquid refrigerant leaving condenser at 43°C (7). High pressure sub cooled liquid entering capillary tube at 32 ℃ (8). Wet mixture leaving Capillary tube at -25 ℃ (9).…”

Section: Theoretical Thermodynamic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrocarbons as Alternate Refrigerants to Replace R134a in Domestic Refrigerators

Siddegowda¹,

Sannappagowda²,

Jain³

et al. 2019

RCMA

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“…Lots of research work has been done for replacing \old" refrigerants with \new" refrigerants. [3][4][5][6][7][8] Reddy et al 9 performed numerical analysis of vapor compression refrigeration system using R134a, R143a, R152a, R404A, R410A, R502 and R507A and discussed the e®ect of evaporator temperature, degree of subcooling at condenser outlet, superheating of evaporator outlet, vapor liquid heat exchanger e®ectiveness and degree of condenser temperature on COP and exergetic e±ciency. They reported that evaporator and condenser temperature have signi¯cant e®ect on both COP and exergetic e±ciency and also found that R134a has the better performance while R407C has poor performance in all respect.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analyses of Multiple Evaporators Vapor Compression Refrigeration Systems With R410a, R290, R1234yf, R502, R404a, R152a and R134a

Chopra

Sahni

Mishra

2014

Int. J. Air-Cond. Ref.

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In this paper, comparative thermodynamic analysis of system-1 (multiple evaporators and compressors with individual expansion valves) and system-2 (multiple evaporators and compressors with multiple expansion valves) has been presented which is based on energy and exergy principles. The comparison of systems-1 and -2 using ecofriendly R410A, R290, R1234YF, R502, R404A, R152A and R134A refrigerants was done in terms of COP (energetic e±ciency), exergetic e±ciency and system defect. Numerical model has been developed for systems-1 and -2 for¯nding out irreversibility and it was observed that system-2 is better system in comparison with system-1 for selected refrigerants. It was also found that R152a shows better performances than other considered refrigerants for both systems.

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“…[1][2][3][4][5] It is very important to obtain accurate and reliable measurements of the solubilities, densities, and viscosities of these mixtures because they are extremely important for the design of refrigeration compressors. Information on these thermophysical properties for refrigerant + lubricant systems is, however, very scarce.…”

Section: Introductionmentioning

confidence: 99%

High-Pressure Volumetric Behavior of x 1,1,1,2-Tetrafluoroethane + (1 − x) 2,5,8,11,14-Pentaoxapentadecane (TEGDME) Mixtures

et al. 2002

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This paper reports 1017 new pVT measurements of the x 1,1,1,2-tetrafluoroethane (HFC-134a) + (1 -x) 2,5,8,11,14-pentaoxapentadecane (TEGDME) system for x ) 0. 0, 0.1114, 0.2896, 0.3648, 0.5702, 0.6931, 0.7288, 0.8727, 0.9290, and 1 between 10 and 60 MPa in the temperature range 293.15 K to 373.15 K at 5 MPa and 10 K intervals, respectively. In almost all the measurement range, the density of the pure compressed refrigerant is greater than that of the pure polyether. For temperatures higher than 343.15 K, the isocomposition curves for the mixtures show an intersection point. Similar behavior has been previously found for HFC-134a + triethylene glycol dimethyl ether, carbon dioxide + alkane or toluene systems, and mixtures of R-410A with polyolester lubricants. The excess molar volume is negative over the whole composition range at all temperatures and pressures.

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HFC 134a as a substitute refrigerant for CFC 12

Cited by 36 publications

References 10 publications

Hydrocarbons as Alternate Refrigerants to Replace R134a in Domestic Refrigerators

Hydrocarbons as Alternate Refrigerants to Replace R134a in Domestic Refrigerators

Thermodynamic Analyses of Multiple Evaporators Vapor Compression Refrigeration Systems With R410a, R290, R1234yf, R502, R404a, R152a and R134a

High-Pressure Volumetric Behavior of x 1,1,1,2-Tetrafluoroethane + (1 − x) 2,5,8,11,14-Pentaoxapentadecane (TEGDME) Mixtures

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