Experimental investigation on enhancement of ammonia absorption process with TiO2 nanoparticles in newly designed absorber

Jiang, Weixue; Li, Shuhong; Yang, Linjun; Du, Kai

doi:10.1016/j.ijrefrig.2018.11.019

Cited by 16 publications

(7 citation statements)

References 34 publications

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“…The atomization absorption and falling film absorption are coupled by the heat and mass transfer at the phase interface in the model. The model is validated by the reported data in the reference [8,27,28]. The improvement of two installation strategies on absorption effect is calculated by the verified model.…”

Section: Introductionmentioning

confidence: 84%

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Enhancement Of The Parallel And Series Mode Of The Ultrasonic Atomizer On The Ammonia-Water Falling Film Absorber

Zhou¹,

Wang²,

Li³

2022

International Conference on Fluid Flow, Heat and Mass Transfer

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Falling film absorber is widely used in the ammonia-water absorption refrigeration system, and the mass transfer area can be enlarged by the atomization device to overcome the shortages of low system energy efficiency and large system size. Ultrasonic atomizer can produced micron size droplets, so the liquid-vapor contact area can be further enlarged. Considering the large flight resistance of the small size droplets, the ultrasonic atomizer devices are located at the top of the absorber, and two installation strategies (i.e., parallel and series) are proposed. To analyze the improvement of the novel absorber with the installation of the atomizer, a mathematical model to describe the mass and heat transfer of the novel absorber is established. The model is verified by the reported data of literature, and the enhancement effects of the parallel and series installation strategies of the atomizer are discussed by the validated model. In the condition of this paper, compared with traditional falling film absorber, the ammonia absorbed rate is increased by 22.5% for the parallel installation strategy and 17% for the series installation strategy. Compared with the improvement of the cooling capacity, the energy consumption of the atomizer is worth.

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Section: Introductionmentioning

confidence: 84%

“…3. Jiang et al [28] did not report the ammonia absorbed rate, and the outlet mass fraction of the solution is calculated as saturated, so the comparison is not listed in Fig. 3.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Enhancement Of The Parallel And Series Mode Of The Ultrasonic Atomizer On The Ammonia-Water Falling Film Absorber

Zhou¹,

Wang²,

Li³

2022

International Conference on Fluid Flow, Heat and Mass Transfer

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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%

“…Therefore, the thermal performance of absorption systems and the appropriate heat exchanger for the absorption chiller could lead to a better COP performance, as seen in Altamirano et al [40]. Another fact seen around the heat and mass transfer process literature is the positive effect of using ionic nanoparticles on the absorption system, increasing the COP of the chiller [105,106].…”

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

confidence: 99%

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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“…Nanofluid application in the ARS improves heat transfer and mass transfer efficiencies of the devices in the experimental system, so the ammonia absorbed by the weak solution in the absorber is increased, and the system COP is enhanced. In existing studies, the heat transfer of the heat exchanger was improved by 22.0% [13], 29.8% [14], or 18.5-27.2% [15] [16,17] and 19% [18], respectively.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Tio2 Nanoparticles and Libr on the Exergy Efficiency of Ammonia Absorption Refrigeration System under Different Working Temperatures

Jin¹,

Li²,

Du³

2022

International Conference on Fluid Flow, Heat and Mass Transfer

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The addition of TiO 2 nanoparticles and LiBr can increase the coefficient of performance(COP) of the ammonia water absorption, but the exergy efficiency has not been investigated. Therefore, this paper studied the influence of TiO 2 nanoparticles and LiBr on the exergy efficiency under different working temperatures. The results show that the addition of TiO 2 nanoparticles or LiBr can improve the ECOP of the ammonia-water absorption refrigeration system. There is optimal T gen , T eva for the NH 3 -H 2 O-LiBr-TiO 2 working fluid, which is 110℃, -13℃. In comparison, the ECOP decreases with the T cw increases. The maximum value of ECOP in this paper is 0.266 when the T eva , T gen , and T cw are -13℃, 110℃, and 28℃. Generally, applying NH 3 -H 2 O -LiBr -TiO 2 nanofluid working fluid can efficiently improve the ECOP of the absorption refrigeration system.

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Experimental investigation on enhancement of ammonia absorption process with TiO2 nanoparticles in newly designed absorber

Cited by 16 publications

References 34 publications

Enhancement Of The Parallel And Series Mode Of The Ultrasonic Atomizer On The Ammonia-Water Falling Film Absorber

Enhancement Of The Parallel And Series Mode Of The Ultrasonic Atomizer On The Ammonia-Water Falling Film Absorber

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

The Influence of Tio2 Nanoparticles and Libr on the Exergy Efficiency of Ammonia Absorption Refrigeration System under Different Working Temperatures

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