An exergy based comparative study between LiBr/water absorption refrigeration systems from half effect to triple effect

Maryami, Reza; Dehghan, Ali Akbar

doi:10.1016/j.applthermaleng.2017.05.174

Cited by 83 publications

(44 citation statements)

References 29 publications

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“…Several studies on absorption systems that use NH 3 /LiNO 3 have been conducted, some of which seek to take experimental approaches (Moreno-Quintanar et al, 2011 and2012;Jimenez and Rivera, 2014;Cai et al, 2016;Jiang et al, 2017) while others take theoretical approaches (Acuña et al, 2013;Farshi et al, 2014;Alvarez et al, 2016;Azhar and Siddiqui, 2017;Maryami and Dehghan, 2017;Sabbagh and Gómez, 2018), especially in the direction of creating prototypes. This is seen in the literature (Hernández-Magallanes et al, 2014;Zamora et al, 2014 and.…”

Section: Introductionmentioning

confidence: 99%

ENERGETIC ANALYSIS OF AN ABSORPTION CHILLER USING NH3/LiNO3 AS AN ALTERNATIVE WORKING FLUID

Lima

Ochoa

Costa

et al. 2019

Braz. J. Chem. Eng.

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This paper presents a thermodynamic model developed for a prototype absorption chiller using NH 3 / LiNO 3 with 10 kW of nominal capacity. The study was undertaken using thermodynamic modeling based on the mass and energy balance, takes the overall heat transfer coefficients into consideration and uses the characteristic equation method. First, the results obtained from the thermodynamic modeling developed were compared with those obtained from the characteristic equations of thermal power activation and the cooling capacity. These showed good agreement with the experimental data, there being maximum relative errors of around 5% for most of the operational conditions of the system. Secondly, a parametric analysis was made by altering the variables, such as temperature, mass flow rate, and configuring the heat dissipation that influences the overall performance of the prototype chiller.

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Section: Introductionmentioning

confidence: 99%

ENERGETIC ANALYSIS OF AN ABSORPTION CHILLER USING NH3/LiNO3 AS AN ALTERNATIVE WORKING FLUID

Lima

Ochoa

Costa

et al. 2019

Braz. J. Chem. Eng.

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“…The new strong solution is pumped to GL, starting the cycle again. The half-effect cycle, despite having relatively low values of the coefficient of performance (COP) compared to the simple effect cycle [12,13], has the peculiarity that it can operate at extreme operating conditions, such as high condensing temperatures and low generation temperatures. Compared to the single-effect cycle, the half-effect cycle has two solution circuits, one of them at high pressure and the other one at low pressure, as can be seen in Figure 2 [12].…”

Section: Introductionmentioning

confidence: 99%

“…The new strong solution is pumped to G L , starting the cycle again. The half-effect cycle, despite having relatively low values of the coefficient of performance (COP) compared to the simple effect cycle [12,13], has the peculiarity that it can operate at extreme operating conditions, such as high condensing temperatures and low generation temperatures. In the literature, there have been many reports about theoretical and experimental works on single-and double-effect absorption systems: However, the literature about absorption half-effect systems is scarce.…”

Section: Introductionmentioning

confidence: 99%

“…According to the author's results, the highest exergy utilization factor (ExUF) value was obtained for the minimum evaporator temperature (4 • C), minimum condenser temperature (27 • C), and 67 • C in both generators (high-and low-temperature) of the absorption chiller. Maryami and Dehghan [13] carried out a comparative theoretical analysis of five configurations of LiBr/water absorption refrigeration systems, included the half-effect configuration. Based on the authors' results, when the evaporator temperature was 4 • C with condenser temperatures of 33 • C and 39 • C, the half-effect system could be operated at lower generator temperatures, around 57 • C and 67 • C, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Analysis of a Half-Effect Absorption Cooling System Powered by a Low-Enthalpy Geothermal Source

et al. 2019

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A thermodynamic analysis of a half-effect absorption cooling system powered by a low-enthalpy geothermal source was carried out. This paper presents modeling of the half-effect absorption cooling system operating with an ammonia/lithium nitrate mixture and based on the first and second laws of thermodynamics, using as energy inputs real data from two geothermal wells located at Las Tres Vírgenes volcanic complex, Baja California Sur, México. Plots of coefficients of performance and exergy efficiency against condenser, evaporator, and generator temperatures are presented for the half-effect cooling system. The results showed that the system was able to operate at generation temperatures between 56 and 70 °C, which were supplied by the geothermal wells in order to produce cooling at temperatures as low as −16 °C, achieving coefficients of performance between 0.10 and 0.36, while the exergy efficiency varied from 0.15 to 0.40 depending on the system operating temperatures.

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“…Omer Kaynakli et al [13] investigated the equation temperature of the overall system and its components by conducting a parametric study on heat capacity and exergy destruction of the HPG, coefficient of performance (COP) of the system and mass flow rate of heat sources. R. Maryami et al [14] done a comparative study between the five classes of LiBr/water absorption refrigeration systems to investigate the influence of various operating parameters on the coefficient of performance. Zeyu Li et al [15] give the yearly performance analysis of a solar air cooled double effect LiBr/H 2 O absorption cooling system in subtropical city, including total efficiency, cooling capacity per area of collector and solar fraction.…”

mentioning

confidence: 99%

Exergy Analysis of a Double-Effect Solar Absorption Refrigeration System in Ngaoundere

Tenkeng¹,

Wouagfack²,

Tchinda³

2019

WJET

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Solar energy is replacing more and more traditional sources of energy because of the fact that it's also fighting about global warming. This study is based on exergy analysis of a double-effect series flow absorption refrigeration system powered by solar energy in Ngaoundere. The simulation is done on the basis of a half hourly analysis for the first time, from 6.30 AM to 6.30 PM, using water-lithium bromide as working pair. The main parameters for the performance of an absorption cycle, which are the COP and the ECOP, have been analyzed and the results show that this two parameters increase while increasing the temperature of the main generator. The exergy loss of each component of the system and the total exergy loss of the system have been analyzed and their effectiveness calculated, using the first and second law of thermodynamics. The highest exergy loss occurs in the main generator GI and in the absorber, making these components more important in an absorption cycle. This analysis is based on a mathematical model using FORTRAN language. The results obtained may be useful for the optimization of solar absorption refrigeration systems.

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An exergy based comparative study between LiBr/water absorption refrigeration systems from half effect to triple effect

Cited by 83 publications

References 29 publications

ENERGETIC ANALYSIS OF AN ABSORPTION CHILLER USING NH3/LiNO3 AS AN ALTERNATIVE WORKING FLUID

ENERGETIC ANALYSIS OF AN ABSORPTION CHILLER USING NH3/LiNO3 AS AN ALTERNATIVE WORKING FLUID

Thermodynamic Analysis of a Half-Effect Absorption Cooling System Powered by a Low-Enthalpy Geothermal Source

Exergy Analysis of a Double-Effect Solar Absorption Refrigeration System in Ngaoundere

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