Hot exhaust gases of an internal combustion engine are to be used to produce saturated water vapor at 2 MPa pressure. The exhaus
t gases enter the heat exchanger at 400oC at a rate of 32 kg/min while water enters at 15oC. The heat exchanger is not well insulated, and it is estimated that 10% of heat given by the exhaust gases is lost to the surroundings. The mass flow rate of the exhaust gases is 15 times that of the water and constant specific heat properties of the exhaust gases can be approximated using the properties of air at 600K. Determine the temperature of the exhaust gases leaving the heat exchanger and the rate of heat transfer to the water.
2 answers:
Answer:
The flowrate of water is 0.03556kg/s
Explanation:
Exhaust gases inlet temperature T1=4000C
Water inlet temperature T3=150C Exit Pressure of water as saturated vapor P4=2MPa
Mass flow rate of exhaust gases Heat lost to the surroundings Qgases=32kg/min
Mass flow rate of exhaust gases is 15 times that of the water
Heat exchangers typically involve no work interactions (w = 0) and negligible...
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Cos of error of special characters
The solution has been attached to the portal
Answer:
153.2 J
Explanation:
Let's first list our given parameters;
mass (m) of the block = 10 kg
which slides down ( i.e displacement) = 2 m
kinetic coefficient of friction (μk) = 0.2
In the diagram shown below; if we take an integral look at the component of force in the direction of the displacement; we have
Fcos 40°
100 (cos 40°)
76.60 N
Workdone by the friction force can now be determined as:
W = × displacement
W = 76.60 × 2
W = 153.2 J
∴ the work done by the friction force = 153.2 J
