Amélioration de la performance des machines frigorifiques á absorption par l'utilisation de cycles à absorption et désorption étagés

Thioye, Massamba

doi:10.1016/s0140-7007(96)00058-8

Cited by 13 publications

(4 citation statements)

References 2 publications

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“…Water cooling pumps: To evacuate the heat released on the condenser and the absorbers, defined by the expressions (6), (10) and (19), a cold water circulation must be ensured by pumps which estimate their electric consumption:…”

Section: Condensermentioning

confidence: 99%

“…To circumvent this limit, certain researchers studied systems with absorption on several floors, laid out, either cascades about it [7] , or in association absorber-generators [10][11][12] . In this study we propose the integration of a compressor insert between two-stage of absorption, which function at the same pair of temperature (T g, T a ).…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Investigation of Two-Stage Absorption Refrigeration System Connected by a Compressor

Kairouani¹,

Nehdi²,

Iffa³

2005

American J. of Applied Sciences

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Abstract:The present work is to analyze a two-stage cycle based on the ammonia-water absorption system, with intermediate compression. The two generators of the system are heated by geothermal energy at low temperature. The study shows that this system makes it possible at lower generator temperature, under the limits permitted by the systems suggested up to now. For T g = 335 K, T c = T a = 308 K and T e = 263 K, based on the electric consumption, the system efficiency is 8.2. The comparative study of the hybrid system and vapor compression systems shows the superiority of the proposed system. Supplied by the geothermal sources of the Tunisian south, the system makes it possible to obtain for a pilot geothermal station, a production of 75 tons of ice per day. The greenhouse gas emissions should thus be reduced by about 2.38 tons of CO 2 per day. Therefore, based on the typical geothermal energy sources in Tunisia which present a global refrigeration potential of 4.4 MW, the daily quantity of ice that could be produced is about 865 tons. The greenhouse gas emissions should thus be reduced by about 10,000 tons of CO 2 per year.

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Section: Condensermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic Investigation of Two-Stage Absorption Refrigeration System Connected by a Compressor

Kairouani¹,

Nehdi²,

Iffa³

2005

American J. of Applied Sciences

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“…These studies showed that a greater improvement in COP related to the system with a compressor installed between the absorber and the evaporator. Massamba Thioye [12] exhibited an improvement in the performance of absorption refrigeration machines by the use of staged absorption and desorption cycles consuming energy in the form of heat with low exergetic value. J.Dardouch, M.Charia et al [13] studied energetically, the single absorption refrigeration machine with a distillation column.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Benefits by Rectification in the Absorption Refrigeration Systems

SALEK¹,

ABABSSİ

Charia³

et al. 2022

International Journal of Thermodynamics

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The main objective of this article aims to enhance a single stage absorption refrigeration machine, using the ammoniawater pair as working fluid, and this from the improvement of its exergetic performances by means of a vapor rectification system. The rectifier makes it possible to emit a vapor enriched in pure fluid (ammonia) with a high flow rate; this one is thus transformed into condensate after condensation; as it also allows evacuating a liquid (water) in the form of reflux. Moreover, in order to show the role of the rectifier and to highlight its impact on the operation of the proposed installation, the methodology adopted in this work aims to develop a thermodynamic model of numerical simulation using the FORTRAN language according to two approaches. An energetic analysis approach which aims to assess, in a first time, the performance of the studied refrigeration installation. However, the exergetic approach tries to calculate the exergy efficiency, and thus to evaluate the losses of exergies of the refrigeration installation in a second time. Therefore, the obtained results showed a clear improvement in the exergetic efficiency, accompanied against by an optimization of the losses of exergies which are due to the irreversibility of the studied thermodynamic system. The novelty brought by the present study encourages the engineers and manufacturers to realize the future absorption refrigeration machines integrating rectifier systems.

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“…L'industrie du froid a des répercussions importantes sur l'environnement [1,2]. Il importe que des mesures spécifiquesà ce secteur soient prises pour maîtriser la consommationénergétique des installations frigorifiques de manièreà limiter les rejets de gazà effet de serre.…”

Section: Introductionunclassified

Avantages d’une configuration de machine à absorption opérant à trois niveaux de pression

Bouaziz

Iffa

Kairouani

2011

Mécanique & Industries

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Cetteétude présente une machine frigorifique fonctionnant suivant un cycleà compressionabsorption. Le système proposé utilise le couple ammoniac-eau comme fluide frigorigène et opèreà trois niveaux de pression. L'absorbeur fonctionneà une pression intermédiaire Pint, prise entre la pression de l'évaporateur (PEV) et celle du condenseur (PCD). Les principauxéléments du système proposé sont modélisés. Les résultats de la simulation numérique sont comparésà ceux relatifs au système conventionnel. L'étude comparative met enévidence les avantages du système objet de cetteétude. Elle prouve le double avantage de la pression intermédiaire non seulement dans l'amélioration des performances de la machineà absorption mais aussi dans la réduction de la température du fonctionnement du générateur. Nous avons montré que pour des températures d'évaporation et de condensation prises respectivementà -10 • C et 40 • C, le cycle frigorifique fonctionneà une température du générateur TGE = 75 • C avec un COP de l'ordre de 0,56. La présenteétude révèle que pour les mêmes conditions de fonctionnement, la machine frigorifique simpleétage, présente un COP qui ne dépasse pas 0,51 avec une température du générateur de l'ordre de 135 • C. Le système hybride présente ainsi le privilège de fonctionnerà basse température et de présenter des performances relativement améliorées.

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Amélioration de la performance des machines frigorifiques á absorption par l'utilisation de cycles à absorption et désorption étagés

Cited by 13 publications

References 2 publications

Thermodynamic Investigation of Two-Stage Absorption Refrigeration System Connected by a Compressor

Thermodynamic Investigation of Two-Stage Absorption Refrigeration System Connected by a Compressor

Enhancing Benefits by Rectification in the Absorption Refrigeration Systems

Avantages d’une configuration de machine à absorption opérant à trois niveaux de pression

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