Isobaric heat capacities of carbon dioxide and argon between 323 and 423 K and at pressures up to 25 MPa

Dordain, L.; Coxam, Jean Yves; Quint, Jacques R.; Grolier, J.-P.E.; Lemmon, Eric W.; Penoncello, Steven G.

doi:10.1016/0896-8446(95)90035-7

Cited by 20 publications

(8 citation statements)

References 6 publications

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“…Heat capacity is a fundamental property for deriving other thermodynamic properties and testing the existing EoS, and it is also widely required in the study of heat transfer processes. , So it is of great interest to investigate the performances of the CPA and c-CPA EoSs upon calculation of heat capacity for carbon dioxide.…”

Section: Resultsmentioning

confidence: 99%

“…The results of two EoSs for isobaric heat capacity C p and isochoric heat capacity C v are given in Table and Figure , in which the C p data are obtained from refs – and the C v data are calculated by the SW equation at the same conditions for comparison. It can be seen that there is no obvious difference between the two EoSs on both C p and C v in the gaseous phase (low pressure).…”

Section: Resultsmentioning

confidence: 99%

“…Temperature dependence of heat capacities for carbon dioxide: (a) C p , (b) C v . Symbols: , (■) 7.3 MPa, (◆) 11.0 MPa, (▲) 18.7 MPa, (●) 25.8 MPa; (---) CPA (blue), () c-CPA (red).…”

Section: Resultsmentioning

confidence: 99%

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A Comprehensive Study on Thermophysical Properties of Carbon Dioxide through the Cubic-Plus-Association and Crossover Cubic-Plus-Association Equations of State

et al. 2020

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The applications of carbon dioxide in heat pump and refrigeration systems are based on a good understanding of its thermophysical properties. Equations of state (EoSs) are largely used to describe the thermophysical behaviors of fluids and can usually give satisfactory results at conditions far from the critical region. However, in the vicinity of the critical point, the long-wavelength of density fluctuations induce an asymptotic singular behavior of fluids, which cannot be described properly by the classical mean-field based EoS. The use of the renormalization group (RG) method with EoSs can correct this nonanalytical behavior near the critical point and not affect the classical behavior far away from the critical region. In this work, an RG method is applied to the Cubic-Plus-Association (CPA) EoS to build a crossover equation. A comprehensive study on thermophysical properties of carbon dioxide, containing vapor−liquid phase equilibrium (VLE) of pure carbon dioxide and its binary mixtures with n-decane and water, compressed density, derivative properties, and transport properties, is performed using this crossover CPA (c-CPA) and the original CPA EoSs to analyze the effects of the RG method on these properties. Our results show that the RG approach can improve the EoS's performances on VLE, compressed density, and some derivative properties such as isobaric heat capacity, while there is no remarkable influence observed on the calculation of transport properties.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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A Comprehensive Study on Thermophysical Properties of Carbon Dioxide through the Cubic-Plus-Association and Crossover Cubic-Plus-Association Equations of State

et al. 2020

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“…81 The vdW model also shows some increase of heat capacity with pressure at low pressures, then decreasing, consistent with experiments on carbon dioxide and argon between 323 and 423 K and at pressures up to 25 MPa. 82 Figure 12 shows temperature and pressure dependences of the second moment ͗ 2 ͘ of the hydrogen-bond angles in water. Increasing the temperature or pressure bends the water-water hydrogen bonds, broadening the distribution of angles as the system varies at low temperatures and pressures from being highly water-cage-like to being more vdW-like.…”

Section: Resultsmentioning

confidence: 99%

A statistical mechanical theory for a two-dimensional model of water

Urbič

Dill²

2010

The Journal of Chemical Physics

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We develop a statistical mechanical model for the thermal and volumetric properties of waterlike fluids. Each water molecule is a two-dimensional disk with three hydrogen-bonding arms. Each water interacts with neighboring waters through a van der Waals interaction and an orientation-dependent hydrogen-bonding interaction. This model, which is largely analytical, is a variant of the Truskett and Dill ͑TD͒ treatment of the "Mercedes-Benz" ͑MB͒ model. The present model gives better predictions than TD for hydrogen-bond populations in liquid water by distinguishing strong cooperative hydrogen bonds from weaker ones. We explore properties versus temperature T and pressure p. We find that the volumetric and thermal properties follow the same trends with T as real water and are in good general agreement with Monte Carlo simulations of MB water, including the density anomaly, the minimum in the isothermal compressibility, and the decreased number of hydrogen bonds for increasing temperature. The model reproduces that pressure squeezes out water's heat capacity and leads to a negative thermal expansion coefficient at low temperatures. In terms of water structuring, the variance in hydrogen-bonding angles increases with both T and p, while the variance in water density increases with T but decreases with p. Hydrogen bonding is an energy storage mechanism that leads to water's large heat capacity ͑for its size͒ and to the fragility in its cagelike structures, which are easily melted by temperature and pressure to a more van der Waals-like liquid state.

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“…In the supercritical region, C P increases threefold or fourfold, with respect to the corresponding values under the ideal gas conditions [34]. It is therefore reasonable to expect an appreciable reduction in the pumping power per unit of exchanged thermal power.…”

Section: The Thermodynamics Performances Of the Mixturesmentioning

confidence: 98%

Prospects of Mixtures as Working Fluids in Real-Gas Brayton Cycles

Invernizzi

2017

Energies

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This paper discusses the thermodynamic characteristics of the closed Brayton cycles in which the compression is placed near the critical point of the working fluid. Under these conditions, the specific volumes of the fluid during the compression are a fraction of the corresponding values under ideal gas conditions, and the cycle performances improve significantly, mainly at moderate top temperatures. As the heat is discharged at about the critical temperature, the choice of the correct working fluid is strictly correlated with the environmental temperature or with the temperature of potential heat users. To resort to mixtures greatly extend the choice of the right working fluid, allowing a continuous variation of the critical temperature. These cycles have a high power density, and the use of ordinary turbomachinery is accompanied by high capacities (tens of megawatts). In the low power range, microturbines or reciprocating engines are required. One important constraint on the choice of the right working fluid is its thermochemical stability that restricts the operative temperatures. Among the organic compounds, the maximum safe temperatures are limited to about 400 • C and, forecasting high temperature applications, it could be interesting to explore the potentiality of the inorganic compounds as secondary fluids in binary mixtures.

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Isobaric heat capacities of carbon dioxide and argon between 323 and 423 K and at pressures up to 25 MPa

Cited by 20 publications

References 6 publications

A Comprehensive Study on Thermophysical Properties of Carbon Dioxide through the Cubic-Plus-Association and Crossover Cubic-Plus-Association Equations of State

A Comprehensive Study on Thermophysical Properties of Carbon Dioxide through the Cubic-Plus-Association and Crossover Cubic-Plus-Association Equations of State

A statistical mechanical theory for a two-dimensional model of water

Prospects of Mixtures as Working Fluids in Real-Gas Brayton Cycles

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