Thermodynamic analysis of a power cycle using a low-temperature source and a binary NH3–H2O mixture as working fluid

Roy, Philippe; Désilets, Martin; Galanis, Nicolas; Nesreddine, Hakim; Cayer, Emmanuel

doi:10.1016/j.ijthermalsci.2009.05.014

Cited by 53 publications

(20 citation statements)

References 15 publications

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“…A widely used method of calculating the heat transfer capacity UA and eventually sizing the heat exchanger is the logarithmic mean temperature difference LMTD method, applied between the inlet and outlet of the heat exchanger by Cayer et al [32], Roy et al [33], and Claesson [34] and given by Equation (1):…”

Section: Methodology For Designing the Heat Exchangermentioning

confidence: 99%

Performance Evaluation of a Helical Coil Heat Exchanger Working under Supercritical Conditions in a Solar Organic Rankine Cycle Installation

et al. 2016

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Worldwide interest in low grade heat valorization using organic Rankine cycle (ORC) technologies has increased significantly. A new small-scale ORC with a net capacity of 3 kW was efficiently integrated with a concentrated solar power technology for electricity generation. The excess heat source from Photovoltaic (PV) collectors with a maximum temperature of 100˝C was utilized through a supercritical heat exchanger that uses R-404A as working medium. By ensuring supercritical heat transfer leads to a better thermal match in the heat exchanger and improved overall cycle efficiency. A helical coil heat exchanger was designed by using heat transfer correlations from the literature. These heat transfer correlations were derived for different conditions than ORCs and their estimated uncertainty is~20%. In order to account for the heat transfer correlation uncertainties this component was oversized by 20%. Next, a prototype was built and installed in an integrated concentrated photovoltaic/thermal (CPV/T)/Rankine system. The results from the measurements show that for better estimation of the sizing of the heat exchanger a more accurate correlation is required in order to design an optimal configuration and thus employ cheaper components.

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Section: Methodology For Designing the Heat Exchangermentioning

confidence: 99%

Performance Evaluation of a Helical Coil Heat Exchanger Working under Supercritical Conditions in a Solar Organic Rankine Cycle Installation

et al. 2016

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“…The expression for q out in equation (2) can be simplified to read in terms of s 2 and s 1 since processes 2-3 and 4-1 are isentropic.…”

Section: Binary Cyclementioning

confidence: 99%

Analysis of binary cycle efficiency using Redlich–Kwong equation of state

Saunderson

Budiman

2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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Coal, natural gas, and nuclear power plants operate using various forms of Rankine cycle. A variant of Rankine cycle known as binary cycle has been implemented in power plants; yet, the optimization of binary cycles remains relatively unexplored. This article is concerned with efficiency maximization of binary cycle by investigating various working fluid materials for different operating conditions. We introduce a novel analysis approach by employing RedlichKwong equation of state to derive a simple, effective way to express the efficiency of binary cycles suitable for most working fluids. Five alkali metals and mercury are investigated for the topping cycle and two fluids for the bottoming cycle. The results show that for operating conditions of 1.25 MPa, 811 K, and 458 kPa, 589 K for the topping cycle and 10.6 MPa, 589 K, and 1.71 kPa, 289 K for the bottoming cycle, the mercury/ammonia combination provides the highest efficiency. For operating conditions of 1.25 MPa, 1123 K, and 458 kPa, 823 K for the topping cycle and 29 MPa, 823 K, and 4 kPa, 295 K for the bottoming cycle the mercury/ammonia combination also provides the highest efficiency. These binary cycle efficiencies are significantly higher than comparative Rankine cycle efficiencies.

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“…They reported that the source temperature and ammonia concentration in the mixture dramatically affect the cycle performance. Roy et al [5] performed a thermodynamic analysis of two ammoniaewater based rankine cycles (one with generator and the other without it) for power production from low temperature energy source considering fixed temperature of source and sink inlet. They found that the applicable range of the evaporation pressure increases with ammonia concentration and source temperature.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on the ammonia–water based bottoming power cycles: The exergoeconomic viewpoint

Mohammadkhani

Ranjbar

Yari

2015

Energy

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Thermodynamic analysis of a power cycle using a low-temperature source and a binary NH3–H2O mixture as working fluid

Cited by 53 publications

References 15 publications

Performance Evaluation of a Helical Coil Heat Exchanger Working under Supercritical Conditions in a Solar Organic Rankine Cycle Installation

Performance Evaluation of a Helical Coil Heat Exchanger Working under Supercritical Conditions in a Solar Organic Rankine Cycle Installation

Analysis of binary cycle efficiency using Redlich–Kwong equation of state

A comparative study on the ammonia–water based bottoming power cycles: The exergoeconomic viewpoint

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