Thermophysical Properties and Heat and Mass Transfer of New Working Fluids in Plate Heat Exchangers for Absorption Refrigeration Systems

Amaris, Carlos; Bourouis, Mahmoud; Vallès, Manel; Salavera, Daniel; Coronas, Alberto

doi:10.1080/01457632.2014.923983

Cited by 20 publications

(16 citation statements)

References 9 publications

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“…The working fluids LiBr/H 2 O and NH 3 /H 2 O present some disadvantages such as corrosion problems, crystallization, low operating pressure for LiBr/H 2 O, toxicity problems, need for an extra component (rectifier) and high operating pressures for the pair NH 3 /H 2 O, need for high temperatures for the mixture separation process in the generator, and limitations to operate with solar energy as a driving source [18,19].…”

Section: Nh 3 /(Lino 3 ) and Nh 3 /(Lino 3 + H 2 O) Solutionmentioning

confidence: 99%

“…Encouraging results were found, especially for the use of solar energy as the triggering system source. Another advantage is related to the rectifier's dispensability in the exit of the cooling vapor when using the mixture NH 3 /LiNO 3 [18][19][20].…”

Section: Nh 3 /(Lino 3 ) and Nh 3 /(Lino 3 + H 2 O) Solutionmentioning

confidence: 99%

“…Several studies were conducted to evaluate the NH 3 /LiNO 3 solution as an alternative work pair for the absorption systems. Some studies assessed this fluid by employing experimental apparatus [24,25], real prototypes [26,27], heat and mass transfer studies [18], and different components and configurations [28,29]. These studies demonstrated the effective performance of these working fluids in absorption systems and showed their technology limitations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Absorption Refrigeration Systems Based on Ammonia as Refrigerant Using Different Absorbents: Review and Applications

et al. 2020

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The interest in employing absorption refrigeration systems is usually related to electricity’s precariousness since these systems generally use thermal rejects for their activation. The application of these systems is closely linked to the concept of energy polygeneration, in which the energy demand to operate them is reduced, which represents their main advantage over the conventional vapor compression system. Currently, the solution pairs used in commercial absorption chillers are lithium bromide/water and ammonia/water. The latter pair has been used in air conditioning and industrial processes due to the ammonia operation’s low temperature. Few review papers on absorption chillers have been published, discussing the use of solar energy as the input source of the systems, the evolution of the absorption refrigeration cycles over the last decades, and promising alternatives to increase the performance of absorption refrigeration systems. There is a lack of consistent studies about designing requirements for absorption chillers, so an updated review covering recent advances and suggested solutions to improve the use and operation of those absorption refrigeration systems using different working fluids is relevant. Hence, this presents a review of the state-of-the-art of ammonia/absorbent based absorption refrigeration systems, considering the most relevant studies, describing the development of this equipment over the years. The most relevant studies in the open literature were collected to describe this equipment’s development over the years, including thermodynamic properties, commercial manufacturers, experimental and numerical studies, and the prototypes designed and tested in this area. The manuscript focuses on reviewing studies in absorption refrigeration systems that use ammonia and absorbents, such as water, lithium nitrate, and lithium nitrate plus water. As a horizon to the future, the uses of absorption systems should be rising due to the increasing values of the electricity, and the environmental impact of the synthetic refrigerant fluids used in mechanical refrigeration equipment. In this context, the idea for a new configuration absorption chiller is to be more efficient, pollutant free to the environment, activated by a heat substantiable source, such as solar, with low cost and compactness structure to attend the thermal needs (comfort thermal) for residences, private and public buildings, and even the industrial and health building sector (thermal processes). To conclude, future recommendations are presented to deal with the improvement of the refrigeration absorption chiller by using solar energy, alternative fluids, multiple-effects, and advanced and hybrid configurations to reach the best absorption chiller to attend to the thermal needs of the residential and industrial sector around the world.

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Section: Nh 3 /(Lino 3 ) and Nh 3 /(Lino 3 + H 2 O) Solutionmentioning

confidence: 99%

Section: Nh 3 /(Lino 3 ) and Nh 3 /(Lino 3 + H 2 O) Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Absorption Refrigeration Systems Based on Ammonia as Refrigerant Using Different Absorbents: Review and Applications

et al. 2020

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“…The binary pair, lithium nitrate/ammonia binary, has been used as an alternative solution for these systems (Libotean et al, 2007 andCuenca et al, 2014). The mixture (NH 3 /LiNO 3 ) has shown good results when compared to the mixtures used in commercial systems (LiBr/H 2 O and also NH 3 /H 2 O), especially when solar energy is used as an activation source of the system (Amaris et al, 2014;Buonomano et al, 2018).…”

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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“…Generally, two substances are involved, one of which works as a refrigerant fluid and the other as an absorber. Several mixtures are used as working fluids, e.g., ammonia/water, water/lithium bromide, water/sulfuric acid, ammonia/sulfocyanide; ammonia lithium/nitrate (Libotean, Salavera, Valles, Esteve, & Coronas, 2007;Amaris, Bourouis, Vallès, Salavera, & Coronas, 2014).…”

Section: Introductionmentioning

confidence: 99%

<b>Energetic analysis of a commercial absorption refrigeration unit using an ammonia-water mixture

et al. 2017

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ABSTRACT. The ROBUR ® absorption refrigeration system (ARS), model ACF60, with a capacity of 17.5 kW, is tested, modeled and simulated in the steady state. To simulate the thermal load a heating system with secondary coolant was used, in which a programmable logic controller (PLC) kept the inlet temperature EVA at around 285.15 K. The mathematical model used was based on balancing the mass, energy and ammonia concentrations and completed by closing equations such as, Newton's cooling equation. The mathematical model was implemented using the Engineering Equation Solver -EES ® . The results obtained after modeling and a numerical permanent simulation are studied using the Duhring diagram. Potential points of internal heat recovery are visualized, and by using graphs of the binary mixture, it is possible to identify the thermodynamic states of all monitored points. The data obtained in the numerical simulation of the ARS was compared with data acquired in the actual tests of the ARS with the ROBUR ® apparatus.

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Thermophysical Properties and Heat and Mass Transfer of New Working Fluids in Plate Heat Exchangers for Absorption Refrigeration Systems

Cited by 20 publications

References 9 publications

Absorption Refrigeration Systems Based on Ammonia as Refrigerant Using Different Absorbents: Review and Applications

Absorption Refrigeration Systems Based on Ammonia as Refrigerant Using Different Absorbents: Review and Applications

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

<b>Energetic analysis of a commercial absorption refrigeration unit using an ammonia-water mixture

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