SEARCH · Search NASA
Results for “supercritical carbon dioxide”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Measuring Heat Transfer Coefficients for Supercritical Carbon Dioxide Cycle Recuperators
This paper describes the measurement of convective heat transfer coefficients and friction factors for sCO 2 flowing in pin-fin patterned pipes at the US DoE’s National Energy Technology Laboratory (NETL) in Morgantown, WV. The measurement procedures were validated by conducting benchmark tests with smooth stainless-steel tube and comparing the results with published correlations for Nusselt number (𝑁𝑢) and friction factor. Over Reynolds numbers (Re D ) ranging from 5×104 to 2.5×105 , measured 𝑁𝑢 was within 5% of the Dittus-Boelter correlation and measured friction factors were within 5% of the McAdams correlation for smooth tube flow.
Construction and Commissioning of a 1 MW Thermal Supercritical Carbon Dioxide Cooling Loop.
Abstract not provided.
Integration of Supercritical Carbon Dioxide Cooling Loop for G3P3 Primary Heat Exchanger.
Abstract not provided.
Performance Comparison of Water VS Supercritical Carbon Dioxide Operation for Custom Radial Vaned Pump
Explore the source record for details and available documents.
Supercritical Carbon Dioxide Externally Pressurized Porous Media Bearings
Explore the source record for details and available documents.
DESIGN OF A 1 MWTH SUPERCRITICAL CARBON DIOXIDE PRIMARY HEAT EXCHANGER TEST SYSTEM.
Abstract not provided.
Modeling and Validation of Flow and Heat Transfer Phenomena for Coal-Fired Boilers for Indirectly-Heated Supercritical Carbon Dioxide Power Cycles
Explore the source record for details and available documents.
Design of a 1MWth Supercritical Carbon Dioxide Primary Heat Exchanger Test System.
Abstract not provided.
Low Flow Acceptance Testing of a 1 MWth Supercritical Carbon Dioxide Primary Heat Exchanger Test System.
Abstract not provided.
200 MWth and 1 MWth Chloride Salt to Supercritical Carbon Dioxide Heat Exchanger and Test Integration Designs.
Abstract not provided.
Low Flow Acceptance Testing of a 1 MWth Supercritical Carbon Dioxide Primary Heat Exchanger Test System.
Abstract not provided.
200 MWth and 1 MWth Chloride Salt to Supercritical Carbon Dioxide Heat Exchanger and Test Integration Designs.
Abstract not provided.
SUPERCRITICAL CARBON DIOXIDE DEWATERING ENHANCED BY COSOLVENT AND SURFACTANT FORMULATIONS
Explore the source record for details and available documents.
Integration of Supercritical Carbon Dioxide Cooling Loop for G3P3 Primary Heat Exchanger.
Abstract not provided.
Development and Test Progress Towards a Supercritical Carbon Dioxide-Based Gas Turbine Waste Heat Recovery System
Supercritical carbon dioxide systems are the focus of significant recent research efforts and promise compact, high-efficiency architecture for gas turbine waste heat recovery for pipeline gas turbines. The waste heat recovery system improves operating efficiency by converting waste heat to additional electric power, which increases overall system efficiency by 35% at the design point, and also significantly improves part-load performance. This paper describes the system design and component selection for a 5.7 MWe waste heat recovery system based on an integrally-geared compressor-expander architecture, including the thermodynamic cycle development, system architecture and component trade studies, and final selection. Validation test results for critical first-of-a-kind compressor and turbine component technologies are also presented, demonstrating full-pressure performance and progress towards commercialization.
Performance Analyses of Supercritical Carbon Dioxide-Based Parabolic Trough Collectors with Double-Glazed Receivers
Supercritical carbon dioxide is becoming a hot research topic as a potential heat transfer fluid in parabolic trough concentrators since it enables operating the solar system at high temperatures for a higher quality of energy. However, the corresponding inflated thermal losses necessitate alternative receiver designs. This work examines four double-glazed receivers, with each annular space being evacuated or non-evacuated, in terms of the absorber tube's diameter (53-80 mm) and the diameter ratios of the two glass shells (1.2-2.0). An analytical model is developed and validated for this purpose, and the four designs are further examined using ground-level solar and meteorological measurements. The results demonstrate higher performance in the case of fully evacuating the receiver and using the smallest possible diameters of the three concentric cylinders, where the energy and exergy efficiencies reach 65.3 and 40.3%, respectively. Yet, evacuating only the inner annular space is sufficient to achieve virtually the same performance level. This energy efficiency decreases to 62% in case of increasing the tube diameter to 80 mm. As the operating temperature increases from 423 to 850 K, the specific thermal losses increase by 3.98-4.34 folds, depending on the receiver design. Double glazing the receivers is favorable only at high operating temperatures of sCO2, where the reduction in thermal losses overcomes the drop in optical efficiency. For an inlet sCO2 temperature of 850 K, thermal losses are reduced by 33.64 and 53.92%, compared to evacuated and non-evacuated single-glazed receivers, respectively. Throughout the year, the fully evacuated and fully non-evacuated double-glazed receivers have energy efficiencies of 54.96 and 52.39%, exergy efficiencies of 33.64 and 32.06%, and thermal losses of 348.8 and 402.5 W/m, respectively.