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T = 879.4 C P=7.83MPa T = 900 C HP Intercooler HPC 26.1 MW P = 7.73 MPa Turbine 52.8 MW LP Turbine 52.8 MW Power Turbine 136.9 MW MPC2 26.1 MW Intercooler T = 69.7 C P=3.57MPa LPC 26.1 MW Intercooler MPC1 26.1 MW T = 30. C P=2.71MPa T = 69.7 C P=8.0MPa T = 522.5 C P=7.89MPa Circulator T = 511.0 C P = 2.75 MPa Generator T = 488.9 C P=7.99MPa Recuperator Figure ES-1. Three-shaft reference design. We also investigated and compared Aspen Plus and HYSYS for BOP process optimization. Both codes agree well with conditions defined in a simple reference design. The deviation in results was less than 0.5%. However, Aspen Plus is limited to isentropic expansion processes without multiple turbine performance curve capabilities. Therefore we decided to use the HYSYS code for our BOP calculations. We also used a numerical model that was originally developed at Massachusetts Institute of Technology (MIT) using the Visual Basic computer language. This numerical model was revised by INL by implementing the NIST CO2 database and adding a reactor core pressure drop equation to the numerical model. The results from HYSYS were compared with those from the Visual-Basic (V-B) model. The results produced by both models agreed very well for the 3-shaft baseline case. The HYSYS CO2 Brayton cycle model gives a 51% plant efficiency, which is an improvement over the 47% for the helium Brayton cycle using the same BOP layout. The improvement in efficiency is attributed to the reduced volumetric flow of CO2 over that of helium, which results in less compression work. Improvement of VHTR Net efficiency: The objective of this task is to determine the overall plant cycle efficiency by the integration and optimization of each of the components used in the power conversion side. In order to perform this task in an efficient manner, our original reference design with a three-shaft turbo-machinery arrangement was used in a parametric study and optimization with helium as working fluid using HYSYS. In parallel to the use of HYSYS, the V-B model was used with an implementation of an appropriate friction pressure drop equation for a pebble bed reactor. This term is importance in determining the net power plant efficiency and is not directly calculated by the HYSYS model. A similar pressure drop equation can be input for a prismatic core of NGNP. After the helium Brayton Cycle loop was optimized a number of HYSYS simulations with S-CO2 were completed. v Precooler Reactor Intermediate Heat ExchangePDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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