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The optimum lengths of the cycle heat exchangers are shown in Figure 6.22. As the pre-cooler temperature difference increases with the increased main compressor inlet temperature the optimum pre-cooler length becomes smaller, because the required heat exchanger effectiveness is smaller. This reflects the reduction of the pre-cooler volume. The optimum length of the recuperators decreases with the increase of the main compressor inlet temperature. The reduction of the optimum length of all cycle heat exchangers indicates the increased importance of pressure drops to the cycle efficiency, since further away from the critical point the fluid density decreases. In general the fractional pressure drops decrease as the main compressor inlet temperature increases (Figure 6.23). The only exceptions are the high pressure sides of the recuperators. Their slight increase is caused by the increase of the mass flow rate (Figure 6.25), which is a result of the efficiency reduction. The decrease of the fractional pressure drop of the pre-cooler and the low pressure side of the recuperators is caused by the fact that the optimum pressure ratio decreases with the increase of the main compressor inlet temperature and therefore the absolute pressure drops are divided by a larger pressure, which leads to the reduction of their values. This behavior is confirmed by the fact that as the pressure ratio saturates the fractional pressure drop reduction saturates as well. Figure 6.24 indicates that the pumping power of the pre-cooler is reduced as the main compressor inlet temperature increases. This is caused mainly by the reduction of the pre-cooler optimum length. The pre-cooler mass flow rate, which varies with the pre- cooler outlet temperature is not significantly affected by the main compressor inlet temperature and has a minor effect on the pumping power. Figure 6.25 shows that the CO2 flow rate increases with the main compressor inlet temperature. This is caused by the reduction of the cycle efficiency. 6.5 Effect of Maximum Operating Pressure and Temperature Since the recompression cycle was selected as the best supercritical CO2 cycle layout the effect of the major operating conditions that are used to improve cycle efficiency 136PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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