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Sylvain Quoilin Chapter 5 : Models 5.5 Pump model In order to predict the pump consumption, a constant efficiency is assumed. The power transmitted to the fluid is given by : W ̇=M ̇⋅v ⋅p –p sh,pump r r,su,pump r,ex,pump r,su,pump And the electrical consumption is expressed by : Welec,pump=W ̇ sh,pump ηpump Since the pump consumption measurement is only performed for two points of the second set of tests, a validation of this model is not possible. The pump efficiency is identified from these two points and the resulting value is : pump=0.15 This value is in agreement with the constructor data : the maximum output pressure of the pump is 20 bars and the maximum engine power is 550W. If these maximum values are taken as a point of functioning, the efficiency identified on this point is equal to 0.14 The flow rate, as aforementioned, is imposed by the pump with the relation : V ̇r,pump=XpumpV ̇r,max,pump with V ̇r,max, pump=210l/h The pump shows a poor efficiency. It is indeed no designed to maximize the efficiency, but to deliver a modifiable and accurate flow rate. This is very appropriate for this test bench, since the flow rate has to be modified. However, a more efficient pump should be integrated in a commercial application of the ORC, increasing in the same process the cycle efficiency. 96PDF Image | Modeling of a Low Temperature Rankine Cycle for Small Scale Cogen
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