Page 128 - DJJ20063- Thermodynamics 1
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DJJ20063- Thermodynamics 1
Q = heat energy flow into system = -2100 kJ/min
W = work energy flow from system kJ/min
m = fluid flow rate = 45 kg/min
h2 - h1 = -580 kJ/kg
C1& C2 = neglected
Z1& Z2 = neglected
Therefore the steady flow energy equation becomes
-2100 kJ/min – W = 45 kg/min (-580 kJ/kg)
W = (26100 – 2100) kJ/min
= 24000 kJ/min
= 400 kJ/s
= 400 Kw
b) Boilers
In a boiler operating under steady conditions, water is pumped into the boiler along the
feed line at the same rate as which steam leaves the boiler along the steam main, and
heat energy is supplied from the furnace at a steady rate.
Figure 3.2.7-2 Steam Boiler
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