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property changes near the critical point the change of the compressor inlet temperature results in a significant change of the CO2 properties and the compression process may not be performed at optimum conditions. 45 44 43 42 41 40 39 2.8 2.6 2.4 2.2 Efficiency Pressure Ratio 2 30 35 40 45 50 Compressor Inlet Temperature (oC) Figure 13.6 Effect of compressor inlet temperature on cycle efficiency for different compressor inlet temperatures Figure 13.6 shows that the cycle efficiency decreases linearly with an increasing compressor inlet temperature. Up to about 45oC inlet temperature the optimum pressure ratio is significantly affected. This indicates that if the cycle is designed for a certain compressor inlet temperature below 45oC, operation at a different compressor inlet temperature will result in a significant decrease of the cycle efficiency since the cycle will be operating away from its optimum pressure ratio. From the steady state point of view the compressor inlet temperature does not have a significant effect on the cycle optimization. Therefore, cycles operating with compressor inlet temperatures farther from the critical temperature can still achieve significantly better efficiency than ideal gas cycles operating at the same conditions. Nevertheless, increasing the compressor inlet temperature to 50oC causes the efficiency to drop by about 5%. This motivates careful 276 Efficiency (%) Pressure RatioPDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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