Question

In steam power plants, open feedwater heaters are frequently used to heat the feedwater bylon mixing it with steam bled off the turbine at an intermediate stage. Consider an feedwater heater that operates at a pressure of 1000 kPa. Feedwater at 50°C and 1000 kPa is to be heated by mixing it with superheated steam at 200°C and 1000 kPa. In an ideal feedwater heater, the mixture leaves the heater as saturated liquid at the feedwater pressure. Determine the ratio of the mass flow rates of the feedwater and the superheated vapor for this case. Answer: 3.73

Answer 1

Solution 2 mię zmonflow rate of feelwater , ke=762.79 KI (Enthalbex l) Ky feed walls my 7 mass flow rate of superheated Vapour ffom steam table hy=host h = 2827.9 Kufry stoom steaga Table 7 af P= 1000 kPa ng + Sußerheated steam aken by saturated liquid = Rate of heat given by superheated Vapour mi ha = maka See water) 2827 762

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