Options and outlook for chiller refrigerants

“…Among these groups of alternatives, HFCs are the most useful. According to Calm [14], possible environmentfriendly refrigerants with zero ozone depletion potential and lower global warming potential could be selected from derivatives of methane and ethane. In this work, full array of methane and ethane derivatives were considered and trade-off in flammability, toxicity, and chemical stability concerning atmospheric lifetime with changes in molecular chlorine, fluorine, and hydrogen content were carried out [6].…”

Section: Selection Of Environment-friendly Refrigerantsmentioning

confidence: 99%

Experimental analysis of reciprocating compressor performance with eco-friendly refrigerants

Bolaji

2010

Proceedings of the Institution of Mechanical Engineers, Part A:

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This article evaluates the compressor performance using five eco-friendly refrigerants in comparison to R12. Experimental apparatus of a complete refrigeration system with reciprocating compressor was developed and the performance of the system with selected refrigerants was evaluated. The results obtained showed that only R134a and R152a have their coefficients of performances close to that of R12 with 6.6 per cent and 3.1 per cent reductions, respectively. Comparison between refrigeration capacities showed the superiority of R152a with 4.9 per cent higher than that of R12. The volumetric efficiencies obtained were 75.8 per cent, 74.4 per cent, and 77.9 per cent for R12, R134a, and R152a, respectively, whereas those of R23, R32, and R143a were 56.8 per cent, 60.6 per cent, and 69.7 per cent respectively. Therefore, R134a and R152a will perform well as substitutes for R12 in vapour compression refrigeration system.

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“…For example, refrigeration based on vapor absorption has been extensively explored recently in an attempt in that direction [1][2][3][4][5][6][7]. An intense search for alternative refrigeration fluids is under way to replace the conventional hydro-chlorofluorocarbons; these are believed to cause ozone depletion and are being phased out.…”

Section: Introductionmentioning

confidence: 99%

Performance assessment of a liquid-phase separation refrigeration cycle

Darwish

Gadalla

2011

Int. J. Energy Res.

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SUMMARY Absorption refrigeration cycles are alternatives to conventional vapor‐compression cycles in which the energy required for refrigeration is provided by heat instead of mechanical work. In this paper, a novel refrigeration cycle utilizing the immiscible liquid‐phase separation behavior is simulated and analyzed using Aspen simulator. The two conjugate liquids adopted in this work are triethylamine (solute) and water (solvent). This binary system has a low critical solution temperature of 18 °C. The thermophysical properties of the binary mixture are generated using the universal functional activity coefficient (UNIFAC) and the nonrandom two‐liquid (NRTL) models. The phase splitting phenomenon at the generator temperature is predicted by both models. However, in comparison with the available experimental data for the same binary mixture, NRTL model gives better predictions for the flow rates and compositions of the material streams. Heat duties of the evaporator, absorber, and generator and the power consumption of the solution pump have been calculated using UNIFAC and NRTL models. The cycle COP that plays a major role in determining the cycle economical viability has been predicted for different operating conditions using the two models. Simulation results show that, for a waste heat reservoir at 60 °C and using NRTL model, the COP is about 2.0. Second law analysis conducted for all cycle components of the cycle shows that about 42% of the total exergy destructed occurs in the generator. Finally, the liquid‐phase separation refrigeration cycle is predicted to be a promising cycle in the near future because of hardware and energy savings. Copyright © 2011 John Wiley & Sons, Ltd.

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Options and outlook for chiller refrigerants

Cited by 25 publications

References 6 publications

Rheological study of TBAB hydrate slurries as secondary two-phase refrigerants

Rheological study of TBAB hydrate slurries as secondary two-phase refrigerants

Experimental analysis of reciprocating compressor performance with eco-friendly refrigerants

Performance assessment of a liquid-phase separation refrigeration cycle

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