CHEE 222 Lecture Notes - Power Balance
23 Nov 2012
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Power = h*m*efficiency ie: power generated in turbine 1 = (hstream 4 hstream 6)*mstream 4*efficiency. = (2947. 4 kj/kg 2548. 8 kj/kg)*(8. 9 kg/s)*0. 72 = 2554. 23 kj/s = 2. 554 mw. This method of calculating power was used for all power calculations that involved turbines, as turbine power generation is simply the product of the mass flowrate and the change in enthalpy between the inlet and outlet streams. This product is then multiplied by the efficiency of the turbine to give the actual power generated. 2. 2: power loss due to efficiency calculation ie: power lost in turbine 1 = (hstream 4 hstream 6)*mstream 4*(1 efficiency) = (2947. 4 kj/kg 2548. 8 kj/kg)*(8. 9 kg/s)*(1-0. 72) = 993. 3112 kj/s = 0. 993 mw. This calculation is very similar to that in 2. 2, the difference being that losses are being calculated, so instead of multiplying the ideal power generation by the efficiency, it is multiplied by 1 efficiency. This gives the difference between the actual and ideal power generated: the losses.
