The National Institute of Standards and Technology (NIST) will execute experimental and modeling work on the thermodynamics of the CO2/H2O system, modeling work on the viscosity of pure CO2, and experimental and modeling work on the thermal conductivity of pure CO2. Specific activities include:
- Perform measurements of dew point for H2O in CO2 at temperatures from approximately 10 degrees Celsius (°C) to approximately 85 °C, at pressures up to about 7 mega-pascals (MPa). Analyze data to extract thermodynamic parameters such as mixture virial coefficients.
- Develop algorithm for reliable vapor-liquid equilibria (VLE) calculation in CO2/H2O and similar mixtures. Fit mixture model to available experimental data. Incorporate model and algorithm into NIST REFPROP software.
- Develop new standard viscosity correlation valid to at least 1273 Kelvin (K) and 1000 MPa.
- Using existing apparatus at NIST, measure pure CO2 thermal conductivity up to 750 K and 70 MPa.
- Develop new standard thermal conductivity correlation valid to at least 1273 K and 100 MPa.
This project will contribute to program goals by expanding supercritical carbon dioxide (CO2) data to aid modeling efforts. This effort will improve the quality of the thermodynamic data on CO2 over the range of conditions of interest in the design and development of supercritical CO2 power cycles. Specifically, this project will execute experimental and modeling work on the thermodynamics of CO2/water mixture systems, modeling work on the viscosity of pure CO2, and experimental and modeling work on the thermal conductivity of pure CO2.
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