Thermophysical Properties of CO2 and CO2-Rich Mixtures

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.

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Data obtained in this project for thermal conductivity of pure CO2 compared with current state-of-the-art correlation

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Thermophysical Properties of Carbon Dioxide and CO2-Rich Mixtures (2014)
Presented by Allan H Harvey, National Institute of Standards and Technology at the 2014 University Turbine Systems Research Workshop.
Project Fact Sheet

Principal Investigator

Allan Harvey

allan.harvey@nist.gov

Project Benefits

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.

Project ID

FE0003931

Website

National Institute of Standards & Technology

http://www.nist.gov/