Discuss the below:
Q: A supply of geothermal hot water is to be used as the energy source in an ideal Rankine cycle, with R-134a as the cycle working fluid. (See the diagrams below) Saturated vapor R-134a leaves the boiler at a temperature of 85°C, and the condenser temperature is 40°C.
Please fill in this table
|
State
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P (kPa)
|
T (°C)
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v (m3/kg)
|
x
|
h (kJ/kg)
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s (kJ/kg-K)
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1
|
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40
|
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0.00
|
|
|
|
2
|
|
|
|
|
|
|
|
3
|
|
85
|
|
1.00
|
|
|
|
4
|
|
40
|
|
|
|
|
(1) Calculate the heat transfers in kJ/kg at the boiler and condenser.
(2) Calculate the work in kJ/kg at the pump and turbine
(3) Calculate the thermal efficiency of this cycle
