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eml 3100 rankine cycle problems 2011

# eml 3100 rankine cycle problems 2011 - Thermodynamics...

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1 Thermodynamics Assume that the steam leaving the boiler is at 3MPa and 400 deg C. The condenser operates at a pressure of 75kPa. The Turbine is required to provide an output to operate a 300 MW electric generator set with an efficiency of 95%. The boiler burner has an efficiency of 85% and burns natural gas with a heating value of 100,000 btu/therm. Assuming that the change in enthalpy across the pump is negligible and that the expansion across the turbine is isentropic along with other ideal Rankine cycle assumptions, estimate the consumption of gas to run this Rankine cycle in therms per hour. If cooling water is provided to the condenser at 85 deg F and leaves at 95 deg F, estimate the cooling water flow rate required in gallons/ minute.

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2 Thermodynamics The equations we need are as follows: Q in = mass flow rate motive fluid * (h 3 – h 2 ) Q in (btu/h)/(0.85* 100,000 btu/therm) = therms of gas consumed per hour. But to solve this we need the mass flow rate of motive fluid…we need some
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eml 3100 rankine cycle problems 2011 - Thermodynamics...

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