PDF Publication Title:
Text from PDF Page: 094
For a P-IHX, with sodium on the tube side, the heat transfer coefficient is given by ððĒðð,ðĄðĒðð = 6.3 + 0.0167ð ð0.85ðð0.93 Eqn. 4-28 for upward flow of sodium in tubes [Mills, 1995]. For S-CO2 flow on the tube side, Kim et al. [2008] have modified the Jackson and Fewster correlation for supercritical pressures in smooth tubes. Given that the operating pressure of S-IHXs will be much higher than the critical pressure of 7.377 MPa, the correlation can be used to produce a Nusselt number that applies to the entire heat exchanger once the Reynolds and Prandtl numbers are obtained from average properties at the inlet and outlet. Kim et al. [2008] determine the S-CO2 Nusselt number to be ððĒ = 0.0182ð ð0.824 ðð0.515 ððĪððð 0.299 Eqn. 4-29 ðððĒðð For enhanced tubes, the Ravigurarajan and Bergles correlation is used to determine the heat transfer coefficient [Ravigurarajan and Bergles, 1996]. The enhancements consist of spiral ribs on the interior of the tubes. Pressure drops are increased, but the heat transfer can be vastly improved, saving a great deal in terms of the size of the heat exchanger. The Ravigurarajan and Bergles correlations for heat transfer and pressure drop are excluded here due to their length, but they can be found in Appendix D. In all designs discussed hence, enhanced tubes are assumed to be used for CO2 only. The experiments used to develop enhanced tube correlations were conducted with air and single-phase water, so other fluids are assumed to be outside the range of validity of their correlations. With the average heat transfer coefficients determined for the two fluids, the overall heat transfer coefficient can be calculated. For sodium-sodium heat exchangers, single-wall tubes are appropriate, but to ensure a leak detection capability and increase the robustness of S-IHXs, double-walled tubes are assumed to be required in a sodium-CO2 or a sodium-water heat exchanger. The work of Kubo et al. [1997] produced results for the effective thermal conductivity of a 9Cr-1Mo double-walled steam generator tube. Using this data, and a thermal conductivity of 9Cr-1Mo steel of 27.9 W/mK [Williams et al., 1984] the value of the effective gap conductivity was determined to be 293.0 mW/mK. This value for effective helium gap conductivity has been used in SoSaT so that the user may define a double-walled tube of any wall thickness and any material. It should be noted that the experiments of Kubo et al. were conducted for a beginning of life (BOL) gap thicknesses of 3 Ξm and the end of life (EOL) gap thickness was measured to be ~7 Ξm. Comparison of the calculated value of gap conductivity with the conductivity of helium at 400 oC and 0.90 MPa, the 94PDF Image | Supercritical Carbon Dioxide Cycle Analysis
PDF Search Title:
Supercritical Carbon Dioxide Cycle AnalysisOriginal File Name Searched:
547500498.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |