Short Fundamental Equations of State for 20 Industrial Fluids

Lemmon, Eric W.; Span, Roland

doi:10.1021/je050186n

Cited by 646 publications

(606 citation statements)

References 665 publications

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“…The approach requires knowledge of the vibrational contributions to the ideal gas heat capacities of the pure gases. They were obtained from the most accurate equations of state available for the three fluids [44][45][46].…”

Section: Transport Propertiesmentioning

confidence: 99%

Cross second virial coefficients and dilute gas transport properties of the (CH 4 + CO 2 ), (CH 4 + H 2 S), and (H 2 S + CO 2 ) systems from accurate intermolecular potential energy surfaces

Hellmann

Bich

Vesovic

2016

The Journal of Chemical Thermodynamics

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The cross second virial coefficient and the dilute gas shear viscosity, thermal conductivity, and binary diffusion coefficient have been calculated for (CH 4 + CO 2 ), (CH 4 + H 2 S), and (H 2 S + CO 2 ) mixtures in the temperature range from (150 to 1200) K. The cross second virial coefficient was obtained using the Mayer-sampling Monte Carlo approach, while the transport properties were evaluated by means of the classical trajectory method. State-of-the-art intermolecular potential energy surfaces for the like and unlike species interactions were employed in the calculations. All potential energy surfaces are based on highly accurate quantum-chemical ab initio calculations, with the potentials for the unlike interactions reported in this work and those for the like interactions taken from our previous studies of the pure gases. The computed transport property values are in good agreement with the few available experimental data, which are limited to (CH 4 + CO 2 ) mixtures close to room temperature. The lack of reliable data makes the values of the thermophysical properties calculated in this work currently the most accurate estimates for lowdensity (CH 4 + CO 2 ), (CH 4 + H 2 S), and (H 2 S + CO 2 ) mixtures. Tables of recommended values for all investigated thermophysical properties as a function of temperature and composition are provided.

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Section: Transport Propertiesmentioning

confidence: 99%

Cross second virial coefficients and dilute gas transport properties of the (CH 4 + CO 2 ), (CH 4 + H 2 S), and (H 2 S + CO 2 ) systems from accurate intermolecular potential energy surfaces

Hellmann

Bich

Vesovic

2016

The Journal of Chemical Thermodynamics

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“…REFPROP R includes implementations of the equations of state which are necessary to obtain property data for the selected working fluids [21][22][23][24][25]. The optimizations were carried out using a genetic algorithm optimizer, with the same settings as those used in ref.…”

Section: Methodsmentioning

confidence: 99%

Design and optimization of a novel organic Rankine cycle with improved boiling process

Andreasen¹,

Larsen

Knudsen³

et al. 2015

Energy

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In this paper we present a novel organic Rankine cycle layout, named the organic splitcycle, designed for utilization of low grade heat. The cycle is developed by implementing a simplified version of the split evaporation concept from the Kalina split-cycle in the organic Rankine cycle in order to improve the boiling process. Optimizations are carried out for eight hydrocarbon mixtures for hot fluid inlet temperatures at 120 • C and 90 • C, using a genetic algorithm to determine the cycle conditions for which the net power output is maximized. The most promising mixture is an isobutane/pentane mixture which, for the 90 • C hot fluid inlet temperature case, achieves a 14.5 % higher net power output than an optimized organic Rankine cycle using the same mixture. Two parameter studies suggest that optimum conditions for the organic split-cycle are when the temperature profile allows the minimum pinch point temperature difference to be reached at two locations in the boiler. Compared to the transcritical organic Rankine cycle, the organic split-cycle improves the boiling process without an entailing increase in the boiler pressure, thus enabling an efficient low grade heat to power conversion at low boiler pressures.

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“…The thermodynamic properties required for the calculations in this study were evaluated using equations of state [15,16,17,18,19] implemented in REFPROP® software [20].…”

Section: Cycle Calculationmentioning

confidence: 99%

Thermodynamic performance of new thermofluidic feed pumps for Organic Rankine Cycle applications

Richardson

2016

Applied Energy

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This study develops thermofluidic pump technology that is powered by heat, rather than by electrical or mechanical power. The objective is to improve the performance of heat-recovery by Organic Rankine Cycles, by using a recently-proposed thermofluidic pump. The thermofluidic pump promises low-cost, high-reliability, and, since it does not consume any of the power produced by the expander, improved return on investment. No performance data for the new thermofluidic pump have been reported previously, therefore a thermodynamic model is derived and used to evaluate performance metrics that characterise pump operation and its impact on the overall cycle efficiency. Improved pump configurations are then developed and analysed. A two-stage pump configuration is presented that enhances the thermal efficiency of the cycle. An economiser is also proposed in order to obtain boiler efficiencies similar to those for mechanical feed pumps. It has been shown that the cycle efficiency with the two-stage pump is maximum when there is no net heat input in the intermediate evaporator. The resulting thermal efficiency exceeds the best-possible efficiency that is obtainable with an ideal mechanical pump. The relative improvement in cycle efficiency achieved with the two-stage thermofluidic pump is greatest for low-temperature cycles operating below 100°C, for which the back work ratio is usually higher and the efficiencies of electro-mechanical feed pumps are poorer -yielding a relative increase of the cycle efficiency by up to 30%.

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Short Fundamental Equations of State for 20 Industrial Fluids

Cited by 646 publications

References 665 publications

Cross second virial coefficients and dilute gas transport properties of the (CH 4 + CO 2 ), (CH 4 + H 2 S), and (H 2 S + CO 2 ) systems from accurate intermolecular potential energy surfaces

Cross second virial coefficients and dilute gas transport properties of the (CH 4 + CO 2 ), (CH 4 + H 2 S), and (H 2 S + CO 2 ) systems from accurate intermolecular potential energy surfaces

Design and optimization of a novel organic Rankine cycle with improved boiling process

Thermodynamic performance of new thermofluidic feed pumps for Organic Rankine Cycle applications

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