A simple but non-ideal Rankine cycle operates with water as the working fluid and operating between pressure limits of 75 kPa and 10 MPa. Water enters the pump subcooled by 4°C and 3200 kJ/kg of heat is added in the boiler. The pump has an efficiency of 92% while the isentropic efficiency of the turbine is 94%. Assume there are no pressure losses in the condenser and boiler, and that both the pump and turbine are adiabatic. QUESTION 1 What is the temperature of the pump inlet? QUESTION 2 What is the enthalpy of the water entering the pump, in kJ/kg? Report your answer to two decimal place using rounding. QUESTION 3 What is the enthalpy, in kJ/kg, of the water at the pump outlet? Remember that this is a reversible, open system, with an incompressible substance! Report your answer to one decimal point using rounding.

A simple but non-ideal Rankine cycle operates with water as the working fluid and operating between pressure limits of 75 kPa and 10 MPa. Water enters the pump subcooled by 4°C and 3200 kJ/kg of heat is added in the boiler. The pump has an efficiency of 92% while the isentropic efficiency of the turbine is 94%. Assume there are no pressure losses in the condenser and boiler, and that both the pump and turbine are adiabatic. QUESTION 1 What is the temperature of the pump inlet? QUESTION 2 What is the enthalpy of the water entering the pump, in kJ/kg? Report your answer to two decimal place using rounding. QUESTION 3 What is the enthalpy, in kJ/kg, of the water at the pump outlet? Remember that this is a reversible, open system, with an incompressible substance! Report your answer to one decimal point using rounding.

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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Question

A simple but non-ideal Rankine cycle operates with
water as the working fluid and operating between
pressure limits of 75 kPa and 10 MPa. Water enters the
pump subcooled by 4°C and 3200 kJ/kg of heat is added
in the boiler. The pump has an efficiency of 92% while
the isentropic efficiency of the turbine is 94%. Assume
there are no pressure losses in the condenser and
boiler, and that both the pump and turbine are adiabatic.
QUESTION 1
What is the temperature of the pump inlet?
QUESTION 2
What is the enthalpy of the water entering the
pump, in kJ/kg? Report your answer to two decimal
place using rounding.
QUESTION 3
What is the enthalpy, in kJ/kg, of the water at the
pump outlet? Remember that this is a reversible,
open system, with an incompressible substance!
Report your answer to one decimal point using
rounding.

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Step 1: Determining the given data

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Step 2: Drawing T-s diagram for the given rankine cycle

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Step 3: Finding temperature of water pump inlet

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Step 4: Finding enthalpy of water entering the pump inlet

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Step 5: Finding actual pump input work

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Step 6: Finding enthalpy of water at pump outlet

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