Thermodynamic Properties of Aqueous Lithium Bromide Using a Multiproperty Free Energy Correlation

Yuan, Z.; Herold, Keith E.

doi:10.1080/10789669.2005.10391144

Cited by 94 publications

(34 citation statements)

References 10 publications

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“…For this study, the correlations developed by Yuan and Herold from the Gibbs free energy and presented in Yuan and Herold (2005) are considered. The advantage of such correlations is that the different properties (enthalpy, entropy, etc.)…”

Section: Model Description and Performance Criteriamentioning

confidence: 99%

“…-Lithium bromide salt has a very low vapor pressure and is assumed to be nonvolatile (Yuan and Herold 2005). The vapor in the system is thus assumed to always be pure water vapor.…”

Section: Model Description and Performance Criteriamentioning

confidence: 99%

“…are necessarily consistent, which can avoid inaccurate calculations in detailed thermodynamic analyses such as this exergetic analysis. For the same reason, to model the liquid water properties, the lithium bromide/water solution correlations (Yuan and Herold 2005) at infinite dilution (x sol = 0) are used. To describe the solid-liquid phase equilibrium (used to describe the solution state at the end of the charging phase), the correlations obtained from experimental results compiled from the literature by Pátek and Klomfar (2006b) are used.…”

Section: Model Description and Performance Criteriamentioning

confidence: 99%

“…The equilibrium conditions can thus be calculated thanks to the water chemical potentials that are equal in the vapor and the solution phase (μ w v =μ w sol ) (Yuan and Herold 2005). -Lithium bromide salt has a very low vapor pressure and is assumed to be nonvolatile (Yuan and Herold 2005).…”

Section: Model Description and Performance Criteriamentioning

confidence: 99%

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Modeling and analysis of energetic and exergetic efficiencies of a LiBr/H20 absorption heat storage system for solar space heating in buildings

Périer-Muzet

Pierrès

2015

Energy Efficiency

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The development of efficient long-term heat storage systems could significantly increase the use of solar thermal energy for building heating. Among the different heat storage technologies, the absorption heat storage system seems promising for this application. To analyze the potential of this technology, a numerical model based on mass, species, energy, and exergy balances has been developed. The evolution over time of the storage imposes a transient approach. Simulations were performed considering temperature conditions close to those of a storage system used for space heating coupled to solar thermal collectors (as the heat source), with ground source heat exchangers (as the cold source). The transient behavior of the system was analyzed in both the charging and discharging phases. This analysis highlights the lowering of energetic and exergetic performance during both phases, and these phenomena are discussed. The thermal efficiency and the energy storage density of the system were determined, equal to 48.4 % and 263 MJ/ m 3 , respectively. The exergetic efficiency is equal to 15.0 %, and the exergy destruction rate is 85.8 %. The key elements in terms of exergy destruction are the solution storage tank, the generator, and the absorber. The impact of using a solution heat exchanger (SHX) was studied. The risk of the solution crystallizing in the SHX was taken into account. With a SHX, the thermal efficiency of the system can reach 75 %, its storage density was 331 MJ/m 3 , and its exergetic efficiency and exergy destruction rate was 23.2 and 77.3 %, respectively. Nomenclature General Ex exergy (J) Ėx exergy flux (W) ex specific exergy (J/kg) h specific enthalpy (J/kg) m mass (kg) ṁ mass flow rate (kg/s) P pressure (Pa) Q heat (J) Q thermal power (W) s specific entropy (J/(kg.K)) t time (s) T temperature (K) U internal energy (J) u specific internal energy (J/kg) V volume (m 3 ) v specific volume (m 3 /kg)Energy Efficiency W mechanical work (J) Ẇ mechanical power (W) x mass fraction of lithium bromide (x=m LiBr /m sol ) (kg LiBr /kg sol )Greek letters ε heat exchanger effectiveness μ chemical potential (J/kg) η efficiency (−) ρ volumetric energy storage density (J/m 3 ) τ exergy destruction ratio (−)

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Section: Model Description and Performance Criteriamentioning

confidence: 99%

“…-Lithium bromide salt has a very low vapor pressure and is assumed to be nonvolatile (Yuan and Herold 2005). The vapor in the system is thus assumed to always be pure water vapor.…”

Section: Model Description and Performance Criteriamentioning

confidence: 99%

Section: Model Description and Performance Criteriamentioning

confidence: 99%

Section: Model Description and Performance Criteriamentioning

confidence: 99%

See 2 more Smart Citations

Modeling and analysis of energetic and exergetic efficiencies of a LiBr/H20 absorption heat storage system for solar space heating in buildings

Périer-Muzet

Pierrès

2015

Energy Efficiency

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“…State points were calculated using thermodynamic properties provided with the EES software package using measurements of temperatures, pressures and flow rates entering and leaving the absorption chiller. Aqueous lithium bromide property routines in EES are used to calculate properties internally [29][30][31]. From these values, specific enthalpy and specific entropy was evaluated.…”

Section: Methodsmentioning

confidence: 99%

Use of Exergy Analysis to Quantify the Effect of Lithium Bromide Concentration in an Absorption Chiller

Lake

Rezaie

Beyerlein

2017

Entropy

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Absorption chillers present opportunities to utilize sustainable fuels in the production of chilled water. An assessment of the steam driven absorption chiller at the University of Idaho, was performed to quantify the current exergy destruction rates. Measurements of external processes and flows were used to create a mathematical model. Using engineering equation solver to analyze and identify the major sources of exergy destruction within the chiller. It was determined that the absorber, generator and condenser are the largest contribution to the exergy destruction at 30%, 31% and 28% of the respectively. The exergetic efficiency is found to be 16% with a Coefficient of performance (COP) of 0.65. Impacts of weak solution concentration of lithium bromide on the exergy destruction rates were evaluated using parametric studies. The studies reveled an optimum concentration that could be obtained by increasing the weak solution concentration from 56% to 58.8% a net decrease in 0.4% of the exergy destruction caused by the absorption chiller can be obtained. The 2.8% increase in lithium-bromide concentration decreases the exergy destruction primarily within the absorber with a decrease of 5.1%. This increase in concentration is shown to also decrease the maximum cooling capacity by 3% and increase the exergy destruction of the generator by 4.9%. The study also shows that the increase in concentration will change the internal temperatures by 3 to 7 • C. Conversely, reducing the weak solution concentration results is also shown to increase the exergetic destruction rates while also potentially increasing the cooling capacity.

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Appendix A: Basic Equations for Properties of Common Liquid Desiccants

Yao

Liu

2014

Ultrasonic Technology for Desiccant Regeneration

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Thermodynamic Properties of Aqueous Lithium Bromide Using a Multiproperty Free Energy Correlation

Cited by 94 publications

References 10 publications

Modeling and analysis of energetic and exergetic efficiencies of a LiBr/H20 absorption heat storage system for solar space heating in buildings

Modeling and analysis of energetic and exergetic efficiencies of a LiBr/H20 absorption heat storage system for solar space heating in buildings

Use of Exergy Analysis to Quantify the Effect of Lithium Bromide Concentration in an Absorption Chiller

Appendix A: Basic Equations for Properties of Common Liquid Desiccants

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