Project Description
The National Institute of Standards and Technology (NIST) will execute experimental and modeling work on the thermodynamics of the CO_{2}/H_{2}O system, modeling work on the viscosity of pure CO_{2}, and experimental and modeling work on the thermal conductivity of pure CO_{2}. Specific activities include:
- Perform measurements of dew point for H_{2}O in CO_{2} 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 CO_{2}/H_{2}O 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 CO_{2} thermal conductivity up to 750 K and 70 MPa.
- Develop new standard thermal conductivity correlation valid to at least 1273 K and 100 MPa.
Project Benefits
This project will contribute to program goals by expanding supercritical carbon dioxide (CO_{2}) data to aid modeling efforts. This effort will improve the quality of the thermodynamic data on CO_{2} over the range of conditions of interest in the design and development of supercritical CO_{2} power cycles. Specifically, this project will execute experimental and modeling work on the thermodynamics of CO_{2}/water mixture systems, modeling work on the viscosity of pure CO_{2}, and experimental and modeling work on the thermal conductivity of pure CO_{2}.
Contact Information
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