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Walter Furst - One of the best experts on this subject based on the ideXlab platform.

  • effect of thf on Equilibrium Pressure and dissociation enthalpy of co2 hydrates applied to secondary refrigeration
    Industrial & Engineering Chemistry Research, 2006
    Co-Authors: Anthony Delahaye, Laurence Fournaison, And Sandrine Marinhas, Imen Chatti, Jeanpierre Petitet, Walter Furst
    Abstract:

    The present work investigates the formation conditions and the latent heat of dissociation of hydrates formed from tetrahydrofuran (THF)−CO2−water mixtures. The conditions investigated are 3.8−15 wt % for THF concentration and 0.2−3.5 MPa for the CO2 partial Pressure range, conditions that are adapted to the use of the corresponding hydrate slurries as secondary refrigerants. Both differential thermal analysis (DTA) and differential scanning calorimetry (DSC) methods were used for the experimental determinations. Experimental values were compared with modeling, combining the van der Waals and Platteeuw approach with the Redlich−Kwong equation of state associated to a modified Huron−Vidal (MHV2) mixing rule. At fixed temperature, adding THF to the systems results in a drastic reduction of CO2 Equilibrium Pressure. For instance, at 280 K, a 78.9% decrease of CO2 Pressure is experimentally observed if the solution contains 3.8 wt % of THF. Furthermore, a dissociation enthalpy of (CO2 + THF) hydrates roughly ...

  • Effect of THF on Equilibrium Pressure and Dissociation Enthalpy of CO2 Hydrates Applied to Secondary Refrigeration
    Industrial and engineering chemistry research, 2006
    Co-Authors: Anthony Delahaye, Laurence Fournaison, Imen Chatti, Jeanpierre Petitet, S. Marinhas, D. Dalmazzone, Walter Furst
    Abstract:

    The present work investigates the formation conditions and the latent heat of dissociation of hydrates formed from tetrahydrofuran (THF)-CO2-water mixtures. The conditions investigated are 3.8-15 wt % for THF concentration and 0.2-3.5 MPa for the CO2 partial Pressure range, conditions that are adapted to the use of the corresponding hydrate slurries as secondary refrigerants. Both differential thermal analysis (DTA) and differential scanning calorimetry (DSC) methods were used for the experimental determinations. Experimental values were compared with modeling, combining the van der Waals and Platteeuw approach with the Redlich-Kwong equation of state associated to a modified Huron-Vidal (MHV2) mixing rule. At fixed temperature, adding THF to the systems results in a drastic reduction of CO2 Equilibrium Pressure. For instance, at 280 K, a 78.9% decrease of CO2 Pressure is experimentally observed if the solution contains 3.8 wt % of THF. Furthermore, a dissociation enthalpy of (CO2 + THF) hydrates roughly two times higher that that of CO2 hydrates was calculated from measured and predicted data of hydrate formation.

Alfredo Di Nola - One of the best experts on this subject based on the ideXlab platform.

  • Prediction of the liquid–vapor Equilibrium Pressure using the quasi‐Gaussian entropy theory
    Journal of Chemical Physics, 1996
    Co-Authors: Andrea Amadei, Danilo Roccatano, M. E. F. Apol, Herman J. C. Berendsen, Alfredo Di Nola
    Abstract:

    We derived a method to evaluate the liquid–vapor Equilibrium Pressure, with high accuracy over a large range of temperature, using the quasi‐Gaussian entropy theory. The final expression that we obtain for the Equilibrium Pressure as a function of the temperature can be considered as a very accurate approximate solution of the Clausius–Clapeyron equation. The method was applied to water, methanol and mercury, and was compared to two usual approximations of the Clausius–Clapeyron equation.

  • Prediction of the liquid-vapor Equilibrium Pressure using the quasi-Gaussian entropy theory
    The Journal of Chemical Physics, 1996
    Co-Authors: Andrea Amadei, Danilo Roccatano, M. E. F. Apol, Herman J. C. Berendsen, Alfredo Di Nola
    Abstract:

    We derived a method to evaluate the liquid–vapor Equilibrium Pressure, with high accuracy over a large range of temperature, using the quasi‐Gaussian entropy theory. The final expression that we obtain for the Equilibrium Pressure as a function of the temperature can be considered as a very accurate approximate solution of the Clausius–Clapeyron equation. The method was applied to water, methanol and mercury, and was compared to two usual approximations of the Clausius–Clapeyron equation.

Maurizio Cecconi - One of the best experts on this subject based on the ideXlab platform.

  • Transient stop-flow arm arterial–venous Equilibrium Pressure measurement: determination of precision of the technique
    Journal of Clinical Monitoring and Computing, 2016
    Co-Authors: Andrew Rhodes, Nick Fletcher, R. Michael Grounds, Maurizio Cecconi
    Abstract:

    Transient stop-flow arm arterial–venous Equilibrium Pressure (Pmsf-arm) is a validated technique for measuring the mean systemic filling Pressure (Pmsf). Pmsf is a functional measure of the effective intravascular volume status. This study aims to assess the precision of the Pmsf-arm measurement. Pmsf-arm was measured by inflating a pneumatic tourniquet around the upper arm 50 mmHg above systolic Pressure for 60 s, four times consecutively, with an interval of 5 min. Arterial (Pa) and venous Pressure (Pv) were recorded every 10 s. Pa–Pv difference was calculated to determine the stop-flow time. The coefficient error (CE) was determined and used to derive the least significant change (LSC) in Pmsf-arm that this technique could reliably detect. The rANOVA test was used to compare repeated measurements of the four determinations of Pmsf-arm. 80 measurements of Pmsf-arm were studied in 20 patients. Pa and Pv equalised after 60 s of inflation (Pa–Pv difference 0 ± 0.01 mmHg). There were no significant differences of Pmsf-arm values among determinations. For a single measurement, the CE was 5 % (±2 %) and the LSC was 14 % (±5 %). Averaging two, three and four measurements the CE improves to 4 % (±1 %), 3 % (±1 %) and 3 % (±1 %) respectively, and the LSC was reduced to 10 % (±4 %), 8 % (±3 %) and 7 % (±3 %) respectively. One measurement of Pmsf-arm can reliably detect changes on Pmsf-arm of 14 %. The precision of Pmsf-arm technique improves when averaging two or three measurements.

  • transient stop flow arm arterial venous Equilibrium Pressure measurement determination of precision of the technique
    Journal of Clinical Monitoring and Computing, 2016
    Co-Authors: Andrew Rhodes, Nick Fletcher, Michael R Grounds, Maurizio Cecconi
    Abstract:

    Transient stop-flow arm arterial–venous Equilibrium Pressure (Pmsf-arm) is a validated technique for measuring the mean systemic filling Pressure (Pmsf). Pmsf is a functional measure of the effective intravascular volume status. This study aims to assess the precision of the Pmsf-arm measurement. Pmsf-arm was measured by inflating a pneumatic tourniquet around the upper arm 50 mmHg above systolic Pressure for 60 s, four times consecutively, with an interval of 5 min. Arterial (Pa) and venous Pressure (Pv) were recorded every 10 s. Pa–Pv difference was calculated to determine the stop-flow time. The coefficient error (CE) was determined and used to derive the least significant change (LSC) in Pmsf-arm that this technique could reliably detect. The rANOVA test was used to compare repeated measurements of the four determinations of Pmsf-arm. 80 measurements of Pmsf-arm were studied in 20 patients. Pa and Pv equalised after 60 s of inflation (Pa–Pv difference 0 ± 0.01 mmHg). There were no significant differences of Pmsf-arm values among determinations. For a single measurement, the CE was 5 % (±2 %) and the LSC was 14 % (±5 %). Averaging two, three and four measurements the CE improves to 4 % (±1 %), 3 % (±1 %) and 3 % (±1 %) respectively, and the LSC was reduced to 10 % (±4 %), 8 % (±3 %) and 7 % (±3 %) respectively. One measurement of Pmsf-arm can reliably detect changes on Pmsf-arm of 14 %. The precision of Pmsf-arm technique improves when averaging two or three measurements.

Anthony Delahaye - One of the best experts on this subject based on the ideXlab platform.

  • effect of thf on Equilibrium Pressure and dissociation enthalpy of co2 hydrates applied to secondary refrigeration
    Industrial & Engineering Chemistry Research, 2006
    Co-Authors: Anthony Delahaye, Laurence Fournaison, And Sandrine Marinhas, Imen Chatti, Jeanpierre Petitet, Walter Furst
    Abstract:

    The present work investigates the formation conditions and the latent heat of dissociation of hydrates formed from tetrahydrofuran (THF)−CO2−water mixtures. The conditions investigated are 3.8−15 wt % for THF concentration and 0.2−3.5 MPa for the CO2 partial Pressure range, conditions that are adapted to the use of the corresponding hydrate slurries as secondary refrigerants. Both differential thermal analysis (DTA) and differential scanning calorimetry (DSC) methods were used for the experimental determinations. Experimental values were compared with modeling, combining the van der Waals and Platteeuw approach with the Redlich−Kwong equation of state associated to a modified Huron−Vidal (MHV2) mixing rule. At fixed temperature, adding THF to the systems results in a drastic reduction of CO2 Equilibrium Pressure. For instance, at 280 K, a 78.9% decrease of CO2 Pressure is experimentally observed if the solution contains 3.8 wt % of THF. Furthermore, a dissociation enthalpy of (CO2 + THF) hydrates roughly ...

  • Effect of THF on Equilibrium Pressure and Dissociation Enthalpy of CO2 Hydrates Applied to Secondary Refrigeration
    Industrial and engineering chemistry research, 2006
    Co-Authors: Anthony Delahaye, Laurence Fournaison, Imen Chatti, Jeanpierre Petitet, S. Marinhas, D. Dalmazzone, Walter Furst
    Abstract:

    The present work investigates the formation conditions and the latent heat of dissociation of hydrates formed from tetrahydrofuran (THF)-CO2-water mixtures. The conditions investigated are 3.8-15 wt % for THF concentration and 0.2-3.5 MPa for the CO2 partial Pressure range, conditions that are adapted to the use of the corresponding hydrate slurries as secondary refrigerants. Both differential thermal analysis (DTA) and differential scanning calorimetry (DSC) methods were used for the experimental determinations. Experimental values were compared with modeling, combining the van der Waals and Platteeuw approach with the Redlich-Kwong equation of state associated to a modified Huron-Vidal (MHV2) mixing rule. At fixed temperature, adding THF to the systems results in a drastic reduction of CO2 Equilibrium Pressure. For instance, at 280 K, a 78.9% decrease of CO2 Pressure is experimentally observed if the solution contains 3.8 wt % of THF. Furthermore, a dissociation enthalpy of (CO2 + THF) hydrates roughly two times higher that that of CO2 hydrates was calculated from measured and predicted data of hydrate formation.

Andrea Amadei - One of the best experts on this subject based on the ideXlab platform.

  • Prediction of the liquid–vapor Equilibrium Pressure using the quasi‐Gaussian entropy theory
    Journal of Chemical Physics, 1996
    Co-Authors: Andrea Amadei, Danilo Roccatano, M. E. F. Apol, Herman J. C. Berendsen, Alfredo Di Nola
    Abstract:

    We derived a method to evaluate the liquid–vapor Equilibrium Pressure, with high accuracy over a large range of temperature, using the quasi‐Gaussian entropy theory. The final expression that we obtain for the Equilibrium Pressure as a function of the temperature can be considered as a very accurate approximate solution of the Clausius–Clapeyron equation. The method was applied to water, methanol and mercury, and was compared to two usual approximations of the Clausius–Clapeyron equation.

  • Prediction of the liquid-vapor Equilibrium Pressure using the quasi-Gaussian entropy theory
    The Journal of Chemical Physics, 1996
    Co-Authors: Andrea Amadei, Danilo Roccatano, M. E. F. Apol, Herman J. C. Berendsen, Alfredo Di Nola
    Abstract:

    We derived a method to evaluate the liquid–vapor Equilibrium Pressure, with high accuracy over a large range of temperature, using the quasi‐Gaussian entropy theory. The final expression that we obtain for the Equilibrium Pressure as a function of the temperature can be considered as a very accurate approximate solution of the Clausius–Clapeyron equation. The method was applied to water, methanol and mercury, and was compared to two usual approximations of the Clausius–Clapeyron equation.