Evaluation of irreversibility in an ammonia-water absorption refrigeration system using three different mathematical models to calculate the thermodynamic properties
Second Law or Exergy Analyses of Absorption Refrigeration Systems (ARS) are very important for optimisations based on available work; these analyses are derived from the operating conditions and property calculations. There are several methods available for calculating the thermodynamic properties u...
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| Format: | Online |
| Language: | eng |
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Universidad Pedagógica y Tecnológica de Colombia
2018
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| Online Access: | https://revistas.uptc.edu.co/index.php/ingenieria/article/view/7746 |
| _version_ | 1801706081184907264 |
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| author | Vera-Romero, Iván Heard-Wade, Christopher Lionel |
| author_facet | Vera-Romero, Iván Heard-Wade, Christopher Lionel |
| author_sort | Vera-Romero, Iván |
| collection | OJS |
| description | Second Law or Exergy Analyses of Absorption Refrigeration Systems (ARS) are very important for optimisations based on available work; these analyses are derived from the operating conditions and property calculations. There are several methods available for calculating the thermodynamic properties used in modelling these systems. A thermodynamic study on an ARS with the ammonia-water mixture (base case) was carried out with the objective of analysing the sensitivity of the overall and individual component irreversibility to the thermodynamic property. To this end, three existing methods were used: (M1), a model proposed by Ibrahim and Klein (1993) and used in the Engineering Equation Solver (EES) commercial software; (M2), a model proposed by Tillner-Roth and Friend (1998) and embodied in REFPROP v.8.0 developed by the National Institute of Standards and Technology (NIST); and (M3), a method proposed by Xu and Goswami (1999) that was programmed for this analysis. The obtained differences in the properties and the first law performance of the ARS are insignificant in the determination of the coefficient of performance (COP) (base case: 0.595, M1: 0.596, M2: 0.594, M3: 0.599). For the second law analysis, the overall irreversibility was the same (123.339kW) despite the irreversibilities per component had important differences: the solution heat exchanger (M1: 5.783kW, M2: 6.122kW, M3: 8.701kW), the desorber (generator) (M1: 51.302kW, M2: 45.713kW, M3: 49.098kW) and the rectifier (M1: 0.766kW, M2: 3.565kW, M3: 0.427kW). The components that destroy exergy the most are the desorber, the absorber and the condenser. |
| format | Online |
| id | oai:oai.revistas.uptc.edu.co:article-7746 |
| institution | Revista Facultad de Ingeniería |
| language | eng |
| publishDate | 2018 |
| publisher | Universidad Pedagógica y Tecnológica de Colombia |
| record_format | ojs |
| spelling | oai:oai.revistas.uptc.edu.co:article-77462022-06-15T16:08:36Z Evaluation of irreversibility in an ammonia-water absorption refrigeration system using three different mathematical models to calculate the thermodynamic properties Evaluación de irreversibilidades en un sistema de refrigeración por absorción amoniaco-agua empleando tres modelos matemáticos diferentes para calcular las propiedades termodinámicas Vera-Romero, Iván Heard-Wade, Christopher Lionel ammonia-water properties absorption refrigeration coefficient of performance irreversibility coeficiente de desempeño irreversibilidad propiedades amoniaco-agua sistema de refrigeración por absorción Second Law or Exergy Analyses of Absorption Refrigeration Systems (ARS) are very important for optimisations based on available work; these analyses are derived from the operating conditions and property calculations. There are several methods available for calculating the thermodynamic properties used in modelling these systems. A thermodynamic study on an ARS with the ammonia-water mixture (base case) was carried out with the objective of analysing the sensitivity of the overall and individual component irreversibility to the thermodynamic property. To this end, three existing methods were used: (M1), a model proposed by Ibrahim and Klein (1993) and used in the Engineering Equation Solver (EES) commercial software; (M2), a model proposed by Tillner-Roth and Friend (1998) and embodied in REFPROP v.8.0 developed by the National Institute of Standards and Technology (NIST); and (M3), a method proposed by Xu and Goswami (1999) that was programmed for this analysis. The obtained differences in the properties and the first law performance of the ARS are insignificant in the determination of the coefficient of performance (COP) (base case: 0.595, M1: 0.596, M2: 0.594, M3: 0.599). For the second law analysis, the overall irreversibility was the same (123.339kW) despite the irreversibilities per component had important differences: the solution heat exchanger (M1: 5.783kW, M2: 6.122kW, M3: 8.701kW), the desorber (generator) (M1: 51.302kW, M2: 45.713kW, M3: 49.098kW) and the rectifier (M1: 0.766kW, M2: 3.565kW, M3: 0.427kW). The components that destroy exergy the most are the desorber, the absorber and the condenser. Los análisis por Segunda Ley, o de Exergia, en los Sistemas de Refrigeración por Absorción (SRA) son muy importantes, ya que permiten realizar análisis de optimización de acuerdo con el trabajo disponible, los cuales se establecen a partir de las condiciones de operación y del cálculo de sus propiedades. Para el modelado de estos sistemas existen diversas metodologías de cálculo para las propiedades termodinámicas. En este trabajo se realiza un estudio termodinámico sobre un SRA con mezcla amoniaco-agua propuesto (Caso Base), con la finalidad de evaluar la sensibilidad en las irreversibilidades globales y por equipo. Para tal efecto se emplearon tres metodologías existentes: (M1) el modelo de Ibrahim y Klein (1993), a través del software comercial Engineering Equation Solver (EES); (M2) el modelo propuesto por Tillner-Roth y Friend (1998), a través del software REFPROP v.8.0, desarrollado por el National Institute of Standars and Technology (NIST), y (M3) la metodología propuesta por Xu y Goswami (1999), programada para este análisis. Las diferencias entre las propiedades obtenidas y el funcionamiento del SRA por Primera Ley no son significativas en la evaluación del COP, obteniendo variaciones mínimas (Caso Base: 0.595, M1: 0.596, M2: 0.594, M3: 0.599). Para el análisis por Segunda Ley, la irreversibilidad total del sistema para los tres modelos resultó ser la misma (Irr Global: 123.339 kW), a pesar de que en la irreversibilidad por equipo sobresalen las diferencias entre el Intercambiador de la Solución (M1: 5.783kW, M2: 6.122kW, M3: 8.701kW), el Desorbedor (M1: 51.302kW, M2: 45.713kW, M3: 49.098kW) y el Rectificador (M1: 0.766kW, M2: 3.565kW, M3: 0.427kW). Los equipos que más destruyen exergia son el Desorbedor, el Absorbedor y el Condensador, respectivamente. Universidad Pedagógica y Tecnológica de Colombia 2018-01-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion research investigación application/pdf application/xml https://revistas.uptc.edu.co/index.php/ingenieria/article/view/7746 10.19053/01211129.v27.n47.2018.7746 Revista Facultad de Ingeniería; Vol. 27 No. 47 (2018); 9-19 Revista Facultad de Ingeniería; Vol. 27 Núm. 47 (2018); 9-19 2357-5328 0121-1129 eng https://revistas.uptc.edu.co/index.php/ingenieria/article/view/7746/6136 https://revistas.uptc.edu.co/index.php/ingenieria/article/view/7746/7178 Copyright (c) 2018 Iván Vera-Romero, Christopher Lionel Heard-Wade |
| spellingShingle | ammonia-water properties absorption refrigeration coefficient of performance irreversibility coeficiente de desempeño irreversibilidad propiedades amoniaco-agua sistema de refrigeración por absorción Vera-Romero, Iván Heard-Wade, Christopher Lionel Evaluation of irreversibility in an ammonia-water absorption refrigeration system using three different mathematical models to calculate the thermodynamic properties |
| title | Evaluation of irreversibility in an ammonia-water absorption refrigeration system using three different mathematical models to calculate the thermodynamic properties |
| title_alt | Evaluación de irreversibilidades en un sistema de refrigeración por absorción amoniaco-agua empleando tres modelos matemáticos diferentes para calcular las propiedades termodinámicas |
| title_full | Evaluation of irreversibility in an ammonia-water absorption refrigeration system using three different mathematical models to calculate the thermodynamic properties |
| title_fullStr | Evaluation of irreversibility in an ammonia-water absorption refrigeration system using three different mathematical models to calculate the thermodynamic properties |
| title_full_unstemmed | Evaluation of irreversibility in an ammonia-water absorption refrigeration system using three different mathematical models to calculate the thermodynamic properties |
| title_short | Evaluation of irreversibility in an ammonia-water absorption refrigeration system using three different mathematical models to calculate the thermodynamic properties |
| title_sort | evaluation of irreversibility in an ammonia water absorption refrigeration system using three different mathematical models to calculate the thermodynamic properties |
| topic | ammonia-water properties absorption refrigeration coefficient of performance irreversibility coeficiente de desempeño irreversibilidad propiedades amoniaco-agua sistema de refrigeración por absorción |
| topic_facet | ammonia-water properties absorption refrigeration coefficient of performance irreversibility coeficiente de desempeño irreversibilidad propiedades amoniaco-agua sistema de refrigeración por absorción |
| url | https://revistas.uptc.edu.co/index.php/ingenieria/article/view/7746 |
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