(a) A simple Rankine cycle uses water as the working fluid (Figure Q3). IN gin 4s 4 gout Figure Q3. Rankine Cycle The boiler operates at 7,000 kPa and the condenser at 100 kPa. At the entrance to the turbine, the temperature is 450 °C. The isentropic efficiency of the turbine is 90%, pressure and pump losses are negligible, and the water leaving the condenser is subcooled by 9.6°C. The boiler is sized for a mass flow rate of 20 kg/s. Determine, (i) The rate at which heat is added in the boiler, The power required to operate the pumps, The net power produced by the cycle, (ii) (iii)

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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(a) A simple Rankine cycle uses water as the working fluid (Figure Q3).
IA
9 in
4s 4
gout
Figure Q3. Rankine Cycle
The boiler operates at 7,000 kPa and the condenser at 100 kPa. At the entrance to the
turbine, the temperature is 450 °C. The isentropic efficiency of the turbine is 90%,
pressure and pump losses are negligible, and the water leaving the condenser is
subcooled by 9.6 °C. The boiler is sized for a mass flow rate of 20 kg/s. Determine,
(i)
The rate at which heat is added in the boiler,
(ii)
The power required to operate the pumps,
(iii)
The net power produced by the cycle,
(iv)
The thermal efficiency.
(b) After a long walk in the 14 °C outdoors, a person wearing glasses enters a room at 25°C
and 60% relative humidity.
(i)
What is the difference between specific and relative humidity?
(ii)
Please explain whether the glasses will become fogged or not and why.
An
Transcribed Image Text:3 (a) A simple Rankine cycle uses water as the working fluid (Figure Q3). IA 9 in 4s 4 gout Figure Q3. Rankine Cycle The boiler operates at 7,000 kPa and the condenser at 100 kPa. At the entrance to the turbine, the temperature is 450 °C. The isentropic efficiency of the turbine is 90%, pressure and pump losses are negligible, and the water leaving the condenser is subcooled by 9.6 °C. The boiler is sized for a mass flow rate of 20 kg/s. Determine, (i) The rate at which heat is added in the boiler, (ii) The power required to operate the pumps, (iii) The net power produced by the cycle, (iv) The thermal efficiency. (b) After a long walk in the 14 °C outdoors, a person wearing glasses enters a room at 25°C and 60% relative humidity. (i) What is the difference between specific and relative humidity? (ii) Please explain whether the glasses will become fogged or not and why. An
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