Modelling and experimental validation of an in-tube vertical falling film absorber with counter flow arrangement of solution and gas

Aminyavari, Mehdi; Aprile, Marcello; Pistocchini, Lorenzo; Motta, Mario

doi:10.1016/j.ijrefrig.2018.12.012

Cited by 12 publications

(3 citation statements)

References 13 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%

“…Absorber is the fundamental equipment of the ARS, and its mass transfer area occupies more than 50% of the total system [8,9]. Meanwhile, the mass fraction difference of the inlet and outlet determines the mass flow rate of absorbent in the system, which influences the heat load of the generator and absorber.…”

Section: Introductionmentioning

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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show abstract

“…Aminyavari et al validated a counter-current in-tube falling-film absorber model by experimental data, and the difference ranges between the calculated results and experimental data are 5.9%. Through the profile study among the length and solution mass fraction, temperature, and heat/mass transfer coefficient, the author mainly proposed that the control process was heat and mass transfer between the falling film and the interface.…”

Section: Introductionmentioning

confidence: 99%

In Silico Modeling of a Novel Refrigeration Process of the Ammonia–Water Falling-Film Absorption

Wei

Zhang

et al. 2019

Ind. Eng. Chem. Res.

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Nowadays, the ammonia–water absorption refrigeration system (AARS) has attracted much attention due to its merits such as energy conservation and environment-friendliness. Meanwhile, growing studies have focused on the key equipment of ammonia–water absorber of AARS. Based on the thermodynamic and transfer property models that are specially determined in this study for the ammonia–water system, a calculational model of the ammonia–water falling-film absorber outside vertical tubes (AW-FFA-OVT) is established. The simulation of the ammonia absorption process is then carried out by the Fortran program in silico. The reliability of the physical models and the absorber model is verified by comparing with the experimental data from the literature. The mechanism of the proposed ammonia absorber is investigated by observing various key factors. The proposed model has already been successfully applied in the design and simulation of the key equipment in an actual AARS process.

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Theoretical analysis of the enhancement effect of ultrasonic oscillation on NH3H2O falling film absorption process

Zhou

Wang

2022

Applied Thermal Engineering

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Modelling and experimental validation of an in-tube vertical falling film absorber with counter flow arrangement of solution and gas

Cited by 12 publications

References 13 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

In Silico Modeling of a Novel Refrigeration Process of the Ammonia–Water Falling-Film Absorption

Theoretical analysis of the enhancement effect of ultrasonic oscillation on NH3H2O falling film absorption process

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