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Problem #5: A non-adiabatic turbine accepts superheated water (steam) at 1 MPa and 540 °C at a mass flow rate of 10 kg/s and with negligible velocity. The water exits the turbine at a pressure of 35 kPa. Heat is lost from the turbine at a rate of 500 kW to surroundings at 20 °C. The turbine power is 8 MW. Determine: a) the rate of entropy generation (W/K), b) the ideal turbine power if there were no heat loss (adiabatic) or irreversibilities in the turbine (MW). Inlet: H2O, 10 kg/s 540 °C, 1 MPa $Q_{out}$ Turbine Outlet: 35 kPa

          Problem #5: A non-adiabatic turbine accepts superheated water (steam) at 1 MPa and 540 °C at a mass
flow rate of 10 kg/s and with negligible velocity. The water exits the turbine at a pressure of 35 kPa.
Heat is lost from the turbine at a rate of 500 kW to surroundings at 20 °C. The turbine power is 8 MW.
Determine: a) the rate of entropy generation (W/K), b) the ideal turbine power if there were no heat loss
(adiabatic) or irreversibilities in the turbine (MW).
Inlet:
H2O, 10 kg/s
540 °C, 1 MPa
$Q_{out}$
Turbine
Outlet:
35 kPa

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Problem #5: A non-adiabatic turbine accepts superheated water (steam) at 1 MPa and 540 °C at a mass
flow rate of 10 kg/s and with negligible velocity. The water exits the turbine at a pressure of 35 kPa.
Heat is lost from the turbine at a rate of 500 kW to surroundings at 20 °C. The turbine power is 8 MW.
Determine: a) the rate of entropy generation (W/K), b) the ideal turbine power if there were no heat loss
(adiabatic) or irreversibilities in the turbine (MW).
Inlet:
H2O, 10 kg/s
540 °C, 1 MPa
Qout
Turbine
Outlet:
35 kPa

Added by Esperanza J.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Khoobchandra Agrawal

11/11/2021

Step 1

At the inlet: h1 = h(1 MPa, 540°C) = 3478.1 kJ/kg At the outlet: h2 = h(35 kPa, x) = h(35 kPa, sf) + x * (hfg) where x = quality of the steam at the outlet h(35 kPa, sf) = 191.8 kJ/kg (from steam tables) hfg = h(35 kPa, g) - h(35 kPa, f) = 2392.8 kJ/kg - 191.8 Show more…

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Problem #5: A non-adiabatic turbine accepts superheated water (steam) at 1MPa and 540deg C at a mass flow rate of 10k(g)/(s) and with negligible velocity. The water exits the turbine at a pressure of 35kPa. Heat is lost from the turbine at a rate of 500kW to surroundings at 20deg C. The turbine power is 8MW. Determine: a) the rate of entropy generation ((W)/(K)), b) the ideal turbine power if there were no heat loss (adiabatic) or irreversibilities in the turbine (MW). Problem #5: A non-adiabatic turbine accepts superheated water (steam) at 1 MPa and 540 C at a mass flow rate of 10 kg/s and with negligible velocity. The water exits the turbine at a pressure of 35 kPa. Heat is lost from the turbine at a rate of 500 kW to surroundings at 20 C. The turbine power is 8 MW. Determine: a) the rate of entropy generation (W/K), b) the ideal turbine power if there were no heat loss (adiabatic) or irreversibilities in the turbine(MW Inlet: H2O,10 kg/s 540 C,1 MPa Turbine Outlet: 35 kPa

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