Heat capacities of supercritical fluid mixtures: Comparing experimental measurements with Monte Carlo molecular simulations for carbon dioxide-methanol mixtures

Ishmael, Mitchell P.E.; Stutzman, Lauren B.; Lukawski, Maciej Z.; Escobedo, Fernando A.; Tester, Jefferson W.

doi:10.1016/j.supflu.2016.11.013

Cited by 7 publications

(2 citation statements)

References 23 publications

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“…The design of the apparatus and its operating principles are described in detail in our earlier publication and are only briefly summarized here. The accuracy of the calorimeter has been validated using carbon dioxide, methanol, and CO 2 –methanol mixtures at temperatures up to 423 K and pressures up to 30 MPa. , …”

Section: Experimental Measurementmentioning

confidence: 99%

“…The accuracy of the calorimeter has been validated using carbon dioxide, methanol, and CO 2 −methanol mixtures at temperatures up to 423 K and pressures up to 30 MPa. 12,13 The flow calorimeter approximates the definition of the isobaric heat capacity of a pure fluid by performing a c P measurement over a small but measurable temperature difference:…”

Section: Experimental Apparatusmentioning

confidence: 99%

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Isobaric Heat Capacity Measurements of Supercritical R1234yf

2018

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R1234yf (2,3,3,3-tetrafluoropropene) is a low global warming potential (GWP) replacement for R134a, a fluid commonly used as a refrigerant in domestic and automotive air conditioning systems and as a working fluid in organic Rankine cycles. The use of R1234yf in energy conversion cycles requires an accurate determination of its thermophysical properties, including the isobaric heat capacity (c P). Using a custom-made flow calorimeter, experimental c P measurements of supercritical R1234yf were made at temperatures T = 373.15 to 413.5 K and absolute pressures P = 3.5 to 10 MPa. The experimental apparatus was calibrated using R134a to increase the measurement accuracy. The heat capacity measurements of R1234yf were compared to available published experimental data and to values obtained from a multiparameter equation of state (EOS). The measured c P values agreed well with the EOS, providing an average absolute deviation (AAD) of 1.6%.

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Section: Experimental Measurementmentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%