Part-load characteristics of a new ammonia/lithium nitrate absorption chiller

Zamora, Miguel Ángel Baltazar; Bourouis, Mahmoud; Coronas, Alberto; Vallès, Manel

doi:10.1016/j.ijrefrig.2014.11.005

Cited by 30 publications

(21 citation statements)

References 10 publications

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“…The driving heat (point 13,14) is supplied to the generator, desorbing the refrigerant vapor (point 1) from the solution. Then, the vapor becomes liquid (point 2) in the condenser, and the condensation heat is transferred to the cooling water (point 18,19).…”

Section: Principlementioning

confidence: 99%

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Dynamic Performance Analysis for an Absorption Chiller under Different Working Conditions

Wang

Shang

et al. 2017

Applied Sciences

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Featured Application: The dynamic performance of the absorption chiller (AC) under different working conditions in this work is significant for the operation of the whole system, of which the stabilization can be affected by the AC transient process.Abstract: Due to the merits of energy saving and environmental protection, the absorption chiller (AC) has attracted a lot of attention, and previous studies only concentrated on the dynamic response of the AC under a single working condition. However, the working conditions are usually variable, and the dynamic performance under different working conditions is beneficial for the adjustment of AC and the control of the whole system, of which the stabilization can be affected by the AC transient process. Therefore, the steady and dynamic models of a single-effect H 2 O-LiBr absorption chiller are built up, the thermal inertia and fluid storage are also taken into consideration. And the dynamic performance analyses of the AC are completed under different external parameters. Furthermore, a whole system using AC in a process plant is analyzed. As a conclusion, the time required to reach a new steady-state (relaxation time) increases when the step change of the generator inlet temperature becomes large, the cooling water inlet temperature rises, or the evaporator inlet temperature decreases. In addition, the control strategy considering the AC dynamic performance is favorable to the operation of the whole system.

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Section: Principlementioning

confidence: 99%

“…In the generator, outside heat source (point 13,14) transfers the driving heat to the inside working fluids, as shown in Figure 2. Since there are thermal storages like the heat exchanger, the container and the solution storage, the machine needs some relaxation time to achieve a new steady-state.…”

Section: Generatormentioning

confidence: 99%

Dynamic Performance Analysis for an Absorption Chiller under Different Working Conditions

Wang

Shang

et al. 2017

Applied Sciences

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“…They found that the advantages offered by the ternary mixture were greater than those presented by the binary mixture (NH 3 /LiNO 3 ). Studies by Zamora et al (2014Zamora et al ( , 2015 developed two pre-industrial absorption chillers, one with a watercooled system and the other with an air-cooled system, which were built with brazed plate heat exchangers. The goals of these papers were to optimize the chiller, the focus being on the circulation pump, and also to characterize these pre-industrial chillers at part-load.…”

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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“…Comparison of the performances of H 2 O‐NH 3 and LiNO 3 ‐NH 3 absorption cycles suggests that the last one can achieve higher cooling capacities and better coefficients of performance . Experimental prototypes have already attained reasonable good coefficients of performance in air‐conditioning applications . The use of a rectification column after the desorber is avoided as the salt is a non‐volatile absorbent.…”

Section: Introductionmentioning

confidence: 99%

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃

2018

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Summary In order to develop compact absorption refrigeration cycles driven by low heat sources, the simulated performance of a microchannel absorber of 5‐cm length and 9.5 cm3 in volume provided with a porous membrane is presented for 3 different solution‐refrigerant pairs: LiBr‐H2O, LiCl‐H2O, and LiNO3‐NH3. The high absorption rates calculated for the 3 solutions lead to large cooling effect to absorber volume ratios: 625 kW/m3 for the LiNO3‐NH3, 552 kW/m3 for the LiBr‐H2O, and 318 kW/m3 for the LiCl‐H2O solutions given the studied geometry. The performance of a complete absorption system is also analyzed varying the solution concentration, condensation temperature, and desorption temperature. The LiNO3‐NH3 and the LiBr‐H2O solutions provide the largest cooling effects. The LiNO3‐NH3 can work at a lower temperature of the heating source, in comparison with the one needed in a LiBr‐H2O system. The lowest cooling effect and coefficient of performance are found for the LiCl‐H2O solution, but this mixture allows the use of lower temperature heating sources (below 70°C). These results can be used for the selection of the most suitable solution for a given cooling duty, depending on the available heat source and condensation temperature.

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Part-load characteristics of a new ammonia/lithium nitrate absorption chiller

Cited by 30 publications

References 10 publications

Dynamic Performance Analysis for an Absorption Chiller under Different Working Conditions

Dynamic Performance Analysis for an Absorption Chiller under Different Working Conditions

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

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃

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Part-load characteristics of a new ammonia/lithium nitrate absorption chiller

Cited by 30 publications

References 10 publications

Dynamic Performance Analysis for an Absorption Chiller under Different Working Conditions

Dynamic Performance Analysis for an Absorption Chiller under Different Working Conditions

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

Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H2 O, LiCl-H2 O, and LiNO3 -NH3

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Modeling and performance analysis of an absorption chiller with a microchannel membrane-based absorber using LiBr-H₂ O, LiCl-H₂ O, and LiNO₃ -NH₃