Prediction of the thermodynamic properties of {ammonia+water} using cubic equations of state with the SOF cohesion function

Figueira, Freddy L.; Derjani-Bayeh, Sylvana; Olivera-Fuentes, Claudio

doi:10.1016/j.fluid.2011.01.010

Cited by 11 publications

(5 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where i f is the fugacity of component NH 3 x and i y , then i x and i y at a given T and P can be calculated from the following steps:…”

Section: Parameterization and Calculation Methodsmentioning

confidence: 99%

“…They can be classified into six groups: cubic EOSs [3][4][5][6][7][8][9][10][11], virial EOSs [12,13], Gibbs excess energy models [14][15][16], Helmoltz free energy models [17][18][19][20][21], Leung-Griffiths model [22], and polynomial functions [23,24]. Tillner-Roth and Friend [17] reviewed some EOSs and models before 1998, and Kherris et al [14] reviewed in detail most of the EOSs and models up to 2013, where strength and weakness of each model was pointed out.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Helmholtz free energy equation of state for the NH3–H2O fluid mixture: Correlation of the PVTx and vapor–liquid phase equilibrium properties

Mao

Jun

Lü

2015

Fluid Phase Equilibria

View full text Add to dashboard Cite

“…where i f is the fugacity of component NH 3 x and i y , then i x and i y at a given T and P can be calculated from the following steps:…”

Section: Parameterization and Calculation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Helmholtz free energy equation of state for the NH3–H2O fluid mixture: Correlation of the PVTx and vapor–liquid phase equilibrium properties

Mao

Jun

Lü

2015

Fluid Phase Equilibria

View full text Add to dashboard Cite

“…where ∆H evap takes into account the enthalpy of the ideal gas state and the residual enthalpy while ∆H des is calculated through the differential isosteric heats of desorption of the components in the mixture [26]. [28] and Tillner-Roth and Friend [29]. The enthalpy of desorption (∆H des ) is calculated by integrating the differential isosteric heat of desorption for ideal adsorbed mixtures [26].…”

Section: Case Study A: Complete Cycle Modelling With Prsv + Iastmentioning

confidence: 99%

Ammonia/Ethanol Mixture for Adsorption Refrigeration

2020

View full text Add to dashboard Cite

Adsorption refrigeration has become an attractive technology due to the capability to exploit low-grade thermal energy for cooling power generation and the use of environmentally friendly refrigerants. Traditionally, these systems work with pure fluids such as water, ethanol, methanol, and ammonia. Nevertheless, the operating conditions make their commercialization still unfeasible, especially owing to safety and cost issues as a consequence of the working pressures, which are higher or lower than 1 atm. The present work represents the first thermodynamic insight in the use of mixtures for adsorption refrigeration and aims to assess the performance of a binary system of ammonia and ethanol. According to the Gibbs’ phase rule, the addition of a component introduces an additional degree of freedom, which allows to adjust the pressure of the system varying the composition of the mixture. The refrigeration process was simulated with isothermal- isochoric flash calculations to solve the phase equilibria, described by the Peng-Robinson-Stryjek-Vera (PRSV) equation of state for the vapor and liquid phases and by the ideal adsorbed solution theory (IAST) and the multicomponent potential theory of adsorption (MPTA) for the adsorbed phase. In operating condenser and evaporator, pressure levels around atmospheric pressure can be achieved using an ammonia/ethanol mixture with a mole fraction of ethanol in the range of 0.70−0.75. A good agreement in the predictions of the adsorbed phase composition was also reported using the IAST and the MPTA methods.

show abstract

“…Conde proposed a mathematic model for thermal conductivity coefficient, which was calculated by employing the mass fraction, density, and thermal conductivity coefficient of pure working fluid. Thus, the thermal conductivity coefficient of ammonia‐water is:

true λ_{M} = x λ_{{NH}_{3}} ρ_{{NH}_{3}} ((), T_{{NH}_{3}}^{*}) x^{0.425} + ((), 1 + x) λ_{H_{2} normalO} ((), T_{{normalH}_{2} O}^{*}),

…”

Section: Computation Of the Thermodynamic Parametersmentioning

confidence: 99%

Thermo‐Economic Analysis and Optimization of Adiabatic Compressed Air Energy Storage (A‐CAES) System Coupled with a Kalina Cycle

Wang

2018

Energy Tech

View full text Add to dashboard Cite

An adiabatic compressed air energy storage system (A‐CAES) can improve the energy storage potential, compared with conventional CAES systems, by capturing the heat generated during the charge stage. However, a challenge remains in the utilization step of the stored thermal energy due to the energy loss from the thermal energy storage vessel, which has hindered commercialization of A‐CAES. To utilize the thermal energy produced by a compressor during the charge process efficiently, a novel system that couples A‐CAES system with the Kalina cycle (KC) is designed to recover the loss of heat. In the new system, which is characterized by a higher and more stable power output, a Kalina cycle and the expander absorb the heat released from thermal energy storage units to generate electricity. Theoretical thermodynamic analysis shows that the novel combined system can achieve more efficient operation than a single A‐CAES system. By examining the effects of key thermodynamic parameters on the exergy efficiency and overall capital cost, a Pareto frontier obtained shows the tradeoff between exergy efficiency and overall capital cost of the system, where 47.17 % and 1.455 k$ kW−1 are determined as the optimum values for the two objectives from the optimum design solutions.

show abstract

Prediction of the thermodynamic properties of {ammonia+water} using cubic equations of state with the SOF cohesion function

Cited by 11 publications

References 27 publications

A Helmholtz free energy equation of state for the NH3–H2O fluid mixture: Correlation of the PVTx and vapor–liquid phase equilibrium properties

A Helmholtz free energy equation of state for the NH3–H2O fluid mixture: Correlation of the PVTx and vapor–liquid phase equilibrium properties

Ammonia/Ethanol Mixture for Adsorption Refrigeration

Thermo‐Economic Analysis and Optimization of Adiabatic Compressed Air Energy Storage (A‐CAES) System Coupled with a Kalina Cycle

Contact Info

Product

Resources

About