Absorption system based on the refrigerant R134a

Borde, I.; Jelínek, M.; Daltrophe, N.

doi:10.1016/0140-7007(95)98161-d

Cited by 70 publications

(47 citation statements)

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“…Similar with those of R124 and DMAC mixture Fig2a'-h' show the excess enthalpy variations with the refrigerant (R134a) molar fraction at different temperatures in terms of molar fraction for the R134a-DMETEG pair considered in [2], the values of which are compared with the results obtained in the present work.…”

Section: Resultssupporting

confidence: 71%

“…The present work can be regarded as a continuation of a previous one [2] where the binary system R124-DMAC was considered in an absorption refrigeration machine and the modeling of the performance and the recirculation ratio was carried out by means of the UNIFAC, which is based on the contributions of groups of atoms on a structural basis ,and considers the liquide solution to be made up of groups rather than pure components as introduced by Fredenslund et al [3]. Interaction parameters between the functional groups may be evaluated using table I [7,8] The results obtained in [2] were not always in a reasonable agreement with experimental data and this may certainly be due to errors induced by the approximations upon which is based the group contribution concept, particularly the property additivity.…”

Section: Introductionmentioning

confidence: 83%

“…For the UNIQUAC model the required interaction parameters are obtained using the experimental data available in the literature [1,2], by minimizing the objective function F defined as follows:…”

Section: Optimization Of Interaction Parametersmentioning

confidence: 99%

“…Interaction parameters between the functional groups may be evaluated using table I [7,8] The results obtained in [2] were not always in a reasonable agreement with experimental data and this may certainly be due to errors induced by the approximations upon which is based the group contribution concept, particularly the property additivity.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of UNIQUAC interaction parameters for absorption refrigeration machine working fluids

Ilhem

Nardjess

Procedes

2018

2018 9th International Renewable Energy Congress (IREC)

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To be able to pre-select new working fluids for absorption refrigeration systems, it is necessary to have a good understanding in the calculation or correlation of thermophysical properties of working fluids. The choice of the most appropriate thermodynamic model for the prediction or calculation of thermodysical properties is a crucial task. Consequently the present study deals with the determination of excess properties for refrigerant mixtures which are required for the calculation of the various involved enthalpies and hence the used refrigeration machine.The present study considered the pairs (2-chloro-1,1,1,2-tétrafluoroethane) (R124) as a refrigerant in combination with an organic absorbent (N, N'-Dimethylacetamide) DMAC and (1,1,1,2-tetrafluoroethane) (R134a) as a refrigerant in combination with an organic absorbent dimethylether tetraethyleneglycol (DMETEG) by calculating the molecular interaction parameters for the UNIQUAC model using the excess enthalpy of mixing at eight different temperatures varying from 0°C to 140°C by a step of 20°C for the first pair and varying from 20°C to 140°C for the second pair.The obtained interaction parameters values led to mixing excess enthalpy results very close to experimental values, contrary to the UNIFAC model which showed huge deviations. Therefore the optimization technique based on the Simplex method proved to be very reliable in the determination of interaction parameters for the UNIQUAC model. Keywords: UNIQUAC; UNIFAC; Excess enthalpy; Refrigerant; Absorbent. RésuméPour pouvoir présélectionner de nouveaux fluides de travail pour les systèmes de réfrigération à absorption, il est nécessaire de bien comprendre le calcul ou la corrélation des propriétés thermophysiques des fluides de travail. Le choix du modèle thermodynamique le plus approprié pour la prédiction ou le calcul des propriétés thermodynamiques est une tâche cruciale. En conséquence, la présente étude traite de la détermination des propriétés excédentaires des mélanges de réfrigérants nécessaires au calcul des différentes enthalpies impliquées et donc de la machine frigorifique utilisée.La présente étude a examiné les paires (2-chloro-1,1,1,2-tétrafluoroéthane) (R124) en tant que frigorigène en combinaison avec un absorbant organique (N, N'-diméthylacétamide) DMAC et (1,1,1, 2-tétrafluoroéthane) (R134a) en tant que réfrigérant en association avec un diméthyléther éther tétraéthylèneglycol (DMETEG) absorbant organique en calculant les paramètres d'interaction moléculaire pour le modèle UNIQUAC en utilisant l'enthalpie de mélange en excès à huit températures différentes variant de 0 ° C à 140 ° C par un pas de 20 ° C pour la première paire et variant de 20 ° C à 140 ° C pour la deuxième paire.Les valeurs des paramètres d'interaction obtenues ont conduit à mélanger les résultats d'excès d'enthalpie très proches des valeurs expérimentales, contrairement au modèle UNIFAC qui présentait des écarts importants. Par conséquent, la technique d'optimisation basée sur la méthode Simplex s'est révélée très fia...

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Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 83%

Section: Optimization Of Interaction Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of UNIQUAC interaction parameters for absorption refrigeration machine working fluids

Ilhem

Nardjess

Procedes

2018

2018 9th International Renewable Energy Congress (IREC)

View full text Add to dashboard Cite

show abstract

“…The performance parameters, namely, HP generator cut-off temperature (t * ), optimum LP generator temperature (t ), circulation ratio (CR) and coefficient of performance (COP) are computed. The equilibrium property correlations are taken from Borde et al (1995aBorde et al ( ,b, 1997 to compute pressures, enthalpies and concentrations at various state points.…”

Section: Double-effect Series Flow Vapour Absorption Refrigeration Symentioning

confidence: 99%

Optimal performance of double-effect series flow vapour absorption refrigeration systems with new working fluids

Arun

Maiya

Murthy

1998

Int. J. Energy Res.

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Comparative performance of HFC134a- and HCFC22-based vapour absorption refrigeration systems

Songara

Fatouh

Murthy

1998

Int. J. Energy Res.

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Absorption system based on the refrigerant R134a

Cited by 70 publications

References 1 publication

Optimization of UNIQUAC interaction parameters for absorption refrigeration machine working fluids

Optimization of UNIQUAC interaction parameters for absorption refrigeration machine working fluids

Optimal performance of double-effect series flow vapour absorption refrigeration systems with new working fluids

Comparative performance of HFC134a- and HCFC22-based vapour absorption refrigeration systems

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