Boiling heat transfer and pressure drop of NH3/LiNO3 and NH3/(LiNO3 + H2O) in a plate heat exchanger

Táboas, Francisco; Bourouis, Mahmoud; Vallès, Manel

doi:10.1016/j.ijthermalsci.2016.02.003

Cited by 16 publications

(8 citation statements)

References 24 publications

(51 reference statements)

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“…Figure 16 shows the COP as a function of the driving temperature for the three different NH3 pairs, H2O, LiNO3, LiNO3 + H2O, and the four technologies single/double/triple, and advanced technology. For the NH3/H2O single-effect absorption chiller [11,[57][58][59]63,100,105,114,122,140], Figure 16, shows that the COP values of the single-effect absorption chiller vary up to 0.7, which represents the common values, considering driving temperature among 50-200 °C. For some references, the values between 50 and 100 °C showed a good fit for using solar energy as an input source of the ARS.…”

Section: Profiles Of the Cop Values Of The Nh 3 /Absorbents Absorptio...mentioning

confidence: 99%

“…Using the same working fluids, Taboas et al [100] presented an experimental study to estimate the heat transfer coefficient by flow boiling and the pressure drop by friction for a plate heat exchanger considering 20% weight of water in the absorbent. The results showed that the solution's mass flow was the parameter that had the most significant influence on the flow boiling coefficient in the operating conditions applied, representing a characteristic of boiling by convection.…”

Section: Heat and Mass Transfer Processes In Absorption Cooling Syste...mentioning

confidence: 99%

“…Due to the lower driving temperature, absorption chillers that make use of the absorbent fluid ammonia/absorbents have the possibility of activation by thermal energy obtained through solar It is evident from these studies that the addition of water as an absorbent in the mixture with NH 3 allowed a better performance in the absorption and desorption process [18,93,100]. Better results were obtained when this process was performed in plate heat exchangers due to the size, ease of installation, cheaper cost, and ease of testing.…”

Section: Chiller Activation By Absorption Through Solar Energymentioning

confidence: 99%

“…The addition of nanoparticles can lead to an increase of 27% of the heat and mass transfer, as shown in Figure 11, where the increase of the TiO 2 nanoparticles increases the COP and the generation and evaporation temperatures. The COP improvement is strongly related to the number of nanoparticles dispersed in the fluid [106] Energies 2020, 13, x FOR PEER REVIEW 20 of 42 It is evident from these studies that the addition of water as an absorbent in the mixture with NH3 allowed a better performance in the absorption and desorption process [18,93,100]. Better results were obtained when this process was performed in plate heat exchangers due to the size, ease of installation, cheaper cost, and ease of testing.…”

Section: Heat and Mass Transfer Processes In Absorption Cooling Syste...mentioning

confidence: 99%

“…This led to the addition of water in the LiNO 3 absorber as a way to minimize these limitations. Thus, several studies [100,130] were carried out to determine the concentration needed to reduce the pressure drop, that is, to reduce the solution's viscosity. Taboas et al [100,122] found that a 20% concentration in water would improve the heat transfer coefficient by boiling the flow and reducing the pressure drop in plate heat exchangers and the best energy gains (COP) in most of the ARS was using NH 3 /(LiNO 3 + H 2 O) working fluids.…”

Section: Final Considerations On the Absorption Refrigeration Systems...mentioning

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 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: Profiles Of the Cop Values Of The Nh 3 /Absorbents Absorptio...mentioning

confidence: 99%

Section: Heat and Mass Transfer Processes In Absorption Cooling Syste...mentioning

confidence: 99%

Section: Chiller Activation By Absorption Through Solar Energymentioning

confidence: 99%

Section: Heat and Mass Transfer Processes In Absorption Cooling Syste...mentioning

confidence: 99%

Section: Final Considerations On the Absorption Refrigeration Systems...mentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2020

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Theoretical and Experimental Study of the Effective Operation Mode of Absorption Refrigeration Chiller for Ice Production

Nguyen

Hoang

2022

The AUN/SEED-Net Joint Regional Conference in Transportation, Energy, and Mechanical Manufacturing Engineering

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Ammonia lithium nitrate and ammonia sodium thiocyanate double effect absorption refrigeration systems: Thermodynamic analysis

Farshi

Asadi

2018

Applied Thermal Engineering

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Boiling heat transfer and pressure drop of NH3/LiNO3 and NH3/(LiNO3 + H2O) in a plate heat exchanger

Cited by 16 publications

References 24 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

Theoretical and Experimental Study of the Effective Operation Mode of Absorption Refrigeration Chiller for Ice Production

Ammonia lithium nitrate and ammonia sodium thiocyanate double effect absorption refrigeration systems: Thermodynamic analysis

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