You are an operating engineer in a steam power plant which is working on a regenerative Rankine cycle and you are requested to find the thermal efficiency of this cycle. You read the following data from the measuring devices used in the power plant: The pressure and temperature of the steam at the inlet of the turbine are 7000kPa and 550°C, respectively. The pressure at the inlet of the condenser is 22 kPa. The extracted steam from the turbine is at 500 kPa and it is used to heat the feed water in an open feed water heater. The pumps and turbine efficiencies are 80% and 85%, respectively. Don't forget to show the cvcle on a T-s diagram.

You are an operating engineer in a steam power plant which is working on a regenerative Rankine cycle and you are requested to find the thermal efficiency of this cycle. You read the following data from the measuring devices used in the power plant: The pressure and temperature of the steam at the inlet of the turbine are 7000kPa and 550°C, respectively. The pressure at the inlet of the condenser is 22 kPa. The extracted steam from the turbine is at 500 kPa and it is used to heat the feed water in an open feed water heater. The pumps and turbine efficiencies are 80% and 85%, respectively. Don't forget to show the cvcle on a T-s diagram.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Consider a power plant operating on a Rankine cycle using steam as the working fluid. The boiler pressure is 2500 kPa and the steam leaving the boiler is superheated to a temperature 126 ◦ C above its saturation temperature. The condenser temperature is 50 ◦ C and it discharges saturated liquid. The eﬃciency of the turbine is 0.90 and of the pump 0.80 as compared to reversible and adiabatic equipment operating at the same pressure ranges. a) Sketch the cycle on a T -S diagram. b) Calculate the thermal eﬃciency of the cycle. c) Compare the thermal eﬃciency of this Rankine cycle with the thermal eﬃciency of a Carnot cycle receiving heat at the saturation temperature of steam at 2500 kPa and discarding it at 50 ◦
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Consider a steam power plant which operates on the simple ideal Baokios cycle (shown in the next page), with the following conditions: • The boiler pressure is 3 MPa • The condenser saturation temperature is 50°C • The steam temperature at the exit of the boiler is 500°C • Water leaves the condenser as a saturated liquid • The mass flow rate through each component is 15 kg/s • The isentropic efficiency of the pump and the turbine are 100s and 80%, respectively • Energy is supplied to the boiler by combustion gases that come from a furnace. The gases enter the boiler at 1027'C and leave at 427C. The combustion gases can be treated like "air". • The condenser rejects heat to a river. The river water enters the condenser at 18"Cc and leaves at 40°C. The specific heat of the river water can be taken as 4.18 k/gK. Calculate the following: 1. The power output of the steam power plant 2. The thermal efficiency of the steam power plant 3. The mass flow rate of combustion gases from the furnace…