Contribution study of the thermodynamics properties of the ammonia-water mixtures

Kherris, Sahraoui; Makhlouf, Mohammed; Zebbar, Djallel; Sebbane, Omar

doi:10.2298/tsci110206083k

Cited by 17 publications

(7 citation statements)

References 29 publications

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“…It includes in its lower part, isobar and isotherm networks, as well as liquid vapor equilibrium curves in equal concentrations. In the upper part, the reference curves allow to establish the characteristics of the vapor phase, starting from a certain equilibrium point in the lower part (Kherris, S., 2013). To determine the enthalpy, we enter with the concentrations obtained from the mass balance on the "x" axis, we enter with a vertical line up to the pressure at which it is being evaluated and finally with a horizontal line up to the "y" axis where the enthalpy can be read, this can be seen in Figure 3.…”

Section: Journal Of Technological Developmentmentioning

confidence: 99%

Design of a single-acting ammonia-water solar absorption cooling system for food preservation

Gómez

Olvera-García

Rosa-Flores

et al. 2020

JTD

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The increase in the use of non-renewable energy sources and the strong dependence of the energy sector on these sources, encourage the study of applications that use renewable energy sources. In this scenario, there has been an increase in the number of jobs related to refrigeration systems that use other sources of energy in addition to electricity, such as absorption cooling systems, which can produce a cooling effect using mainly heat. residual or other sources such as solar thermal energy. This article presents the design of a cooling system that will operate with solar energy, using the principle of absorption with the ammonia-water working torque in continuous function, to contribute to a cold production alternative in food preservation.

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Section: Journal Of Technological Developmentmentioning

confidence: 99%

Design of a single-acting ammonia-water solar absorption cooling system for food preservation

Gómez

Olvera-García

Rosa-Flores

et al. 2020

JTD

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“…V (with composition y i ) is the vapour product and L (with composition x i ) is the liquid product. The Equations for the enthalpy and the Gibbs free energy equation [28][29][30] are as follows:…”

Section: Governing Equationsmentioning

confidence: 99%

Computational Model of a Biomass Driven Absorption Refrigeration System

Mbikan

Al‐Shemmeri

2017

Energies

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Abstract:The impact of vapour compression refrigeration is the main push for scientists to find an alternative sustainable technology. Vapour absorption is an ideal technology which makes use of waste heat or renewable heat, such as biomass, to drive absorption chillers from medium to large applications. In this paper, the aim was to investigate the feasibility of a biomass driven aqua-ammonia absorption system. An estimation of the solid biomass fuel quantity required to provide heat for the operation of a vapour absorption refrigeration cycle (VARC) is presented; the quantity of biomass required depends on the fuel density and the efficiency of the combustion and heat transfer systems. A single-stage aqua-ammonia refrigeration system analysis routine was developed to evaluate the system performance and ascertain the rate of energy transfer required to operate the system, and hence, the biomass quantity needed. In conclusion, this study demonstrated the results of the performance of a computational model of an aqua-ammonia system under a range of parameters. The model showed good agreement with published experimental data.

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“…The main problem with LiBr-H2O fluids mixture is the crystallization of the system [3], while the NH3-H2O couple can cause corrosion of the installation. Since, the ammonia has been used as refrigerant in absorption cooling systems for a long time [4]; the choice of the binary ammonia-water solution (H2O-NH3) as the working fluid of the refrigeration machine [5][6] refer to this mixture presents very interesting characteristics and advantages [7], in particular when attempting to produce cold at temperatures below zero degree Celsius [8][9]. In other words, improving a machine reverts to improving its performances.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Benefits by Rectification in the Absorption Refrigeration Systems

SALEK¹,

ABABSSİ

Charia³

et al. 2022

International Journal of Thermodynamics

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The main objective of this article aims to enhance a single stage absorption refrigeration machine, using the ammoniawater pair as working fluid, and this from the improvement of its exergetic performances by means of a vapor rectification system. The rectifier makes it possible to emit a vapor enriched in pure fluid (ammonia) with a high flow rate; this one is thus transformed into condensate after condensation; as it also allows evacuating a liquid (water) in the form of reflux. Moreover, in order to show the role of the rectifier and to highlight its impact on the operation of the proposed installation, the methodology adopted in this work aims to develop a thermodynamic model of numerical simulation using the FORTRAN language according to two approaches. An energetic analysis approach which aims to assess, in a first time, the performance of the studied refrigeration installation. However, the exergetic approach tries to calculate the exergy efficiency, and thus to evaluate the losses of exergies of the refrigeration installation in a second time. Therefore, the obtained results showed a clear improvement in the exergetic efficiency, accompanied against by an optimization of the losses of exergies which are due to the irreversibility of the studied thermodynamic system. The novelty brought by the present study encourages the engineers and manufacturers to realize the future absorption refrigeration machines integrating rectifier systems.

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Contribution study of the thermodynamics properties of the ammonia-water mixtures

Cited by 17 publications

References 29 publications

Design of a single-acting ammonia-water solar absorption cooling system for food preservation

Design of a single-acting ammonia-water solar absorption cooling system for food preservation

Computational Model of a Biomass Driven Absorption Refrigeration System

Enhancing Benefits by Rectification in the Absorption Refrigeration Systems

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