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Two independent variables are chosen to be used in the optimization, these are amount of superheat () and pressure ratio (). The amount of superheat is the temperature in degrees Celsius above the saturation temperature and the pressure ratio is expander is inlet pressure over outlet pressure. Since total inlet temperature is constant, when the amount of superheat changes the saturation temperature and pressure change appropriately. These particular variables are chosen because they have the largest effect on expander performance and efficiency as shown in (Tarique, 2011). Bounds for certain variables are important in any optimization dealing with engineering problems since “optimal” values may be found in areas which are not possible. Bounds are needed for the two independent variables due to the fact that there are limits for the pressure ratio and the amount of superheat possible before physical and practical limits are reached. Table 5.4 shows various variables and their bounds that are of importance in the optimization. Table 5.4: Upper and lower bounds for the important variables involved in the optimization Variable Independent Variables Critical Variables which Require Physical Limits Lower Bound PR 1.5 Tsh 5 T4 25 RPM 0 Upper Bound 10 45 100 4000 Here, T4 is the condenser outlet temperature and is set so that it is not possible to go below 25 ̊C since this is the environment temperature which it operates in. RPM is set so that it cannot go below 0 or over 4000 which is a practical limit for this particular 57PDF Image | Exergoeconomic Analysis and Optimization of ORC
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