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A number of important parameters were investigated for this study. The parameters investigated are: various temperature differences across the reactor, reactor inlet temperatures, inlet cooling temperatures to compressors, effectiveness factor of the IHX and recuperator, efficiencies of the compressors, turbines, and other components. Results corresponding to various temperature differences across the reactor for a three-shaft 250 MW thermal helium Brayton cycle using a 92 % effectiveness factor for the intermediate heat exchange and 90 % polytropic efficiency for the turbines and compressors, indicate that at a relatively low reactor outlet temperature (850 C), the maximum cycle efficiency peaks at 45%, which corresponds to a reactor inlet temperature of 520 C. As the reactor outlet temperature is allowed to increase, the maximum efficiency increases to 51.5% at an outlet temperature of 1000 C. For intermediate outlet temperature between 850 C and 1000 C, the cycle efficiency increases from 45% to 51.5% with the corresponding reactor inlet temperature increasing from 520 C to 640 C. The effect of compressor efficiency on the overall Brayton cycle efficiency was determined by varying the compressor efficiency from 90 to 94 % using a constant reactor inlet and outlet temperature of 5000C and 900 C, respectively. The results showed that the cycle efficiency increases from 48.2% for a compressor polytropic efficiency of 90% to 50.2% for a polytropic efficiency of 94%. A practical way of reducing the compressor work is to keep the specific volume of the gas as small as possible during the polytropic compression. This can be achieved by maintaining the gas temperature as low as possible because specific volume is proportional to temperature. By dividing the compression process into stages and cooling the gas between stages, the total work done during the compression process is reduced. By reducing the compressor inlet temperature by 5 C, the overall cycle efficiency increases by 0.65 %. We also investigated the sensitivity of the effectiveness of the intermediate heat exchanger (IHX) on the overall cycle efficiency. If the effectiveness of the IHX is improved from 90% to 92% at a core outlet temperature of 9500C and a core inlet temperature of 400°C, for example, there is an initial improvement of the overall Brayton efficiency by 0.65%. The IHX effectiveness has less impact on the efficiency compared to the compressor efficiency. In order to validate the HYSYS and V-B models, a simple one-shaft Brayton cycle layout and reference design of the GTHTR300 was used. GTHTR300 is a direct cycle plant that consists of three subsystem modules including a reactor with a prismatic core, a gas turbine generator module with one turbine, one compressor, and a generator on a single shaft in a horizontal arrangement, and a heat exchanger module with one recuperator and one precooler as shown in Figure ES-2. Figure ES-2. GTHTR300 Layout. viPDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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