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SFR Component Design and Balance of Plant Compressors Buffer tanks Coolers Heater Recuperators Figure 3: ANL PCHETM Performance Tests for Prototypical Low Temperature Recuperator Conditions. Figure 5: JAEA 10 MPa Small-Scale S-CO2 Loop. KAERI has developed a new compact diffusion-bonded heat exchanger design incorporating airfoil-shaped fins separating interconnected channels as opposed to non- connected independent zigzagged channels. Calculations with the FLUENT computational fluid dynamics code showed that the heat exchanger design with airfoil shapes achieves the same heat exchange rate while significantly reducing the pressure drops. Small-scale heat exchangers incorporating the new airfoil-shaped design and zigzagged semicircular channels were fabricated through diffusion bonding. The heat exchangers shall be tested in a new S-CO2 HEX testing facility at KAERI. SNL has been coordinating the design, construction, and testing of a small-scale (~ 1 MWt) S-CO2 Brayton cycle power conversion system to confirm the performance of S-CO2 cycles and demonstrate key technical issues for the cycle. SNL provided information on the fabrication and initial results from operation and testing of a single 50.2KW centrifugal compressor in a small-scale S-CO2 compression loop operating near the CO2 critical point. The compressor is driven by a motor/alternator; heat generated during compres- sion is removed in a waste heat chiller. The compressed CO2 is expanded after flowing through an orifice simulating the expansion in a turbine. Tests were conducted covering compressor inlet conditions at the critical point, on the liquid side of the two-phase dome, on the vapor side of the dome, and inside the dome. The results confirm that the compressor can be operated and that the S-CO2 cycle should be controllable near the critical point. Information 1 0.1 0.01 0.001 HEAT TRANSFER CORRELATIONS High Fit (High) Medium Fit (Medium) Low Fit (Low) Plain Fit (Plain) PCHE (ANL) 1 10 100 1000 Re 10000 100000 1000000 Figure 4: Comparison of ANL PCHETM Performance Data with Correlations for Heat Transfer in Zigzagged Semicircular Channels.2 JAEA provided results on the heat exchange and pressure drop performance of small-scale compact diffusion-bonded heat exchangers (high and low temperature recuperators), compressor efficiency near the critical point, and flow stability near the critical point from tests carried out in a closed 10 MPa S-CO2 loop at JAEA incorporating an electrical heater, piston CO2 compressors, heat exchangers with cores simulating portions of the cores of high and low temperature recuperators, and CO2 expansion through a valve in place of a turbine. Heat exchangers incorporating either zigzagged semicircular channels or a new configuration with S-shaped fins and interconnected channels were tested. Data showed that the S-fin recuperator has lower pressure drops than a zigzagged fin recuperator while both provide the same heat transfer performance. The tests also confirmed that compressor efficiency increases near critical point and that the loop was not subject to CO2 flow instability. 250 GIF Symposium – Paris (France) – 9-10 September, 2009 Colburn Factor (j)PDF Image | SFR COMPONENT DESIGN AND BALANCE OF PLANT PROJECT
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