Domestic refrigerators with absorption-diffusion units and heat-transfer panels

Smirnov, G. F.; Bukraba, M.A; Fattuh, T; Nabulsi, B

doi:10.1016/s0140-7007(96)00039-4

Cited by 8 publications

(3 citation statements)

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“…The gas, kerosene or electrically driven diffusioneabsorption refrigerators (DAR) were theoretically and experimentally investigated in numerous research projects concerning refrigeration applications (Alme ´n; Chen et al, 1996;Jakob et al, 2008;Kouremenos et al, 1994;Kim et al, 1995;Smirnov et al, 1996;Srikhirin and Aphornratana, 2002;Vicatos, 2000).…”

Section: Absorption Refrigerationmentioning

confidence: 99%

Attempt of integration of a small commercial ammonia-water absorption refrigerator with a solar concentrator: Experience and results

Busso¹,

Franco

Sogari³

et al. 2011

International Journal of Refrigeration

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Section: Absorption Refrigerationmentioning

confidence: 99%

Attempt of integration of a small commercial ammonia-water absorption refrigerator with a solar concentrator: Experience and results

Busso¹,

Franco

Sogari³

et al. 2011

International Journal of Refrigeration

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“…The evaporator and absorber in the ARU make up the so-called "natural circulation loop" [12], in which VGM moves at a speed of 0.10...0.50 m/s as a natural convection [13], which also reduces the intensity of internal heat and mass transfer processes.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Operation Modes of the Evaporator of the Absorption Refrigerating Unit

Тітлов

Adambayev

Vasyliv

2020

EUREKA: Physics and Engineering

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Absorption refrigeration units (ARU), which are part of absorption refrigeration devices (ARD) with a natural working fluid (water, ammonia and hydrogen) have a number of unique qualities. These qualities include: noiselessness, high reliability and long life; the possibility of using several energy sources in one device. At the same time, ARDs have increased energy consumption compared to similar compression models, and this does not allow them to expand their presence in the market of household refrigeration equipment. The ARU evaporator provides a predetermined temperature level in the chambers of the refrigeration appliance and the required cooling capacity. In this regard, it is relevant to search for the operating modes of the evaporator that provide the ARU maximum energy efficiency, which is the aim of this work. The thermal conditions of the direct-flow three-pipe design of the evaporator are simulated. The calculated ratio for a once-through evaporator is obtained taking into account the assumption of the adiabaticity of the evaporation process, when all the heat of the phase transition is used to cool the incoming flows of the purified vapor-gas mixture (VGM) and liquid ammonia to a minimum temperature. The analysis of the results of calculating the operating modes of the evaporator made it possible to determine the directions of ways to increase the energy efficiency of both the evaporator itself and the ARU in general: a) preliminary cooling of the purified VGM flow at the inlet of the adiabatic section of the evaporator with an under-recovery of up to 5 °C and up to 10 °C; b) preliminary cooling of the liquid ammonia flow at the inlet of the adiabatic section of the evaporator with an under-recovery of up to 5 °C for all ARU types; c) increasing the purification degree of the VGM flow in the absorber allows increasing the temperature of the purified VGM flow at the inlet of the adiabatic section of the evaporator by 4...6 °C, i. e. to reduce the costs of useful cooling capacity for pre-cooling by 10...15 %

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“…Su eficiencia es baja, normalmente un refrigerador basado en esta tecnología provee una capacidad frigorífica de entre 200 a 400 W, con un coeficiente de desempeño, COP, entre 0.2 a 0.25. Es así, que por varios años se han realizado investigaciones tanto de manera teórica como experimental buscando incrementos significativos en el rendimiento energético para aplicaciones domésticas (Smirnov et al, 1996;Gutiérrez, 1998), pero el mejor COP que ha sido encontrado es de alrededor de 0.3 (Chen et al, 1996).…”

Section: Introductionunclassified

Modelado del evaporador de un sistema difusión-absorción: análisis energético y efecto sobre el diseño de un frigobar

Belman-Flores

Rodríguez-Muñoz

2015

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En este artículo se presenta como aportación, el desarrollo del modelado de un evaporador que forma parte de un sistema de refrigeración difusión-absorción de pequeña capacidad volumétrica (frigobar). El modelo es basado en fundamentos físicos y correlaciones empíricas, además, se involucran parámetros geométricos de interés como la longitud y el diámetro del evaporador. Se realiza un análisis experimental para obtener los comportamientos térmicos del evaporador bajo tres posiciones del termostato; a través de estos resultados se lleva a cabo la validación del modelo, arrojando errores marginales por debajo del 10%. En base a la buena confiabilidad mostrada por el modelo, este se aplica para la simulación energética del sistema global. Entre los resultados relevantes se pueden conseguir reducciones en la longitud del evaporador sin alterar la capacidad frigorífica y el desempeño energético del sistema experimental, representando esto una oportunidad para los fabricantes en extender su análisis a los diferentes equipos que forman un sistema de difusión-absorción en la búsqueda de mejoras energéticas y condiciones de diseño óptimas.

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Domestic refrigerators with absorption-diffusion units and heat-transfer panels

Cited by 8 publications

References 0 publications

Attempt of integration of a small commercial ammonia-water absorption refrigerator with a solar concentrator: Experience and results

Attempt of integration of a small commercial ammonia-water absorption refrigerator with a solar concentrator: Experience and results

Improvement of Operation Modes of the Evaporator of the Absorption Refrigerating Unit

Modelado del evaporador de un sistema difusión-absorción: análisis energético y efecto sobre el diseño de un frigobar

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