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Chot cp,hotm hot (6) The effectiveness is set for each heat exchanger (90% for the intermediate heat exchanger and 95% for the recuperator). Next, the qmax is determined using equation 4 through 6. In the case of Helium cp is constant through the heat exchanger and Cmin is not a function of temperature. However, in the case of CO2 or other real gases cp is not constant and Cmin is a function of temperature. To account for this, the assumption was made that cp through the heat exchanger would be the average, cp,avg of cp,in and cp,out. In order to fully define a heat exchanger, the inlet and outlet temperature and pressure must be known, along with the mass flow for both the hot and cold side of the heat exchanger. Therefore q of the heat exchanger can be calculated. HYSYS uses an adjust function to make the heat exchanger satisfy the effectiveness condition. Equations 3 and 4and the heat exchanger conditions are entered into HYSYS. HYSYS then calculates q, qmax and for the exchanger. A modifiable condition is then entered into HYSYS. This condition is adjusted, while the others are held constant, so that the heat exchanger satisfies the effectiveness condition. For the IHX the cold side outlet temperature is adjusted. While for the recuperator the hot side outlet pressure is adjusted. Therefore, if a condition is altered the modifiable condition can be adjusted to satisfy the effectiveness condition. Direct cycles versus indirect cycles were compared based on a 600 MW-thermal Japanese GTHTR and a 900°C reactor outlet temperature. Figure 14 shows HYSYS layout for the indirect cycle with 48% efficiency compared with a 52% for the direct cycle. Figure 14. HYSYS layout for the indirect Brayton cycle. 12PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle
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