10 nd Applied Lectures

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Fundamentals of Thermal and Hydraulic Machines and Fluid Power 
 
10
nd
 Applied Lectures 
1) A Rankine-Hirn power plant shows the following features:
a. Steam generator: 150 t/h, 450°C, 120bar and h
b
=0.95;
b. turbines: h
q
=0.83;
c. Heat Customer: 35 t/h, 2 bar;
d. Regenerative bleed: 15 t/h, 80 bar;
e. Condenser: 0.07 bar.
Evaluate the Power (h
o
=0.95) and the Efficiency of the plant.
2) A Joule-Bryton power plant shows the following features:
a. Two stages of uniform intercooled compression: b=13, h
y
’=h
y
’’ =0.92;
b. Two combustors: T
MAX
=1400K, h
b
’=h
b
’’ =0.96;
c. Gas Generator Turbine: h
mc
=0.98, h
mt
=0.98, h
y
=0.9;
d. Power Turbine: h
y
=0.9, h
o
=9.95;
e. A regenerative Heat Exchanger: Rs=0.8;
The mass flow air at the inlet of the compressor is 200 t/h.
By considering the ratio (1+a)/a approximately equal to 1 and negligible the pressure
drops across heat exchangers and combustors, evaluate the Power and the Efficiency of
the plant.