SSC JE Mechanical Engineering 2017 Set 3 Paper

Question : 102 of 200

Marks: +1, -0

The engine oil at 150°C is cooled to 80°C in a parallel flow heat exchanger by water entering at 25°C and leaving at 60°C. The exchanger effectiveness will be _____.

0.36
0.46
0.56
0.66

Validate

Solution:

C_w(T_{w0}-T_{w1})

=C_0(T_{01}-T_00)

C_w > C_0

C_w/C_0=70/35=2

∴∈={∈_0(T_{0i}-T_{00})}/{∈_0(T_{0i}-T_{wi})}

={150-80}/{150-25}=70/125=0.56

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