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Figure 6.14 allows understanding how the superheating can be fixed. Two parameters can be used: the mass flow rate and the evaporator pressure (shaft rotational speed). As it is proved by both sets of tests, an increase in pressure reduces the mass flow rate but in contrast increases the fluid overheating at the expander inlet and vice versa. In the search for high efficiency, the evaporating pressure is usually increased, what could negatively affect the output of the system if the superheating is kept constant. However, a degree of superheating (∆Tsup) in the range 5-15 K seems reasonable. 6.5.1.5 The torque Expander and asynchronous machine are coupled through a torque meter. Figure 6.15 shows the linear evolution of the torque with the rotation speed. The increase of the quantity of the heat available for the cycle has as effect an increase of the torque and subsequently of the shaft power. 9 8 7 6 5 4 3 2 1 1250 1500 1750 2000 2250 2500 Nrot [rpm] 2750 3000 3250 2 1 Figure 6.15 - Torque as a function of the rotation speed 6.5.1.6 Expander shaft power The shaft power is evaluated knowing the value of the torque and the rotational speed given by the inverter screen with the following relation: . Wsh =Ctrq(2πNrot/60) (6.6) The graph expander shaft power vs rotational speed (Figure 6.16) can be fitted as a parabola with a maximum, what could be predicted from equation 6.6 as the torque is a linear function of the rotational speed (See Figure 6.15). A maximum power of 733.5 W is obtained at 2250 rpm for the first set of points, while for the second set of tests 1369 Page | 149 Ctrq[Nm]PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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