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ESE 2021 ME Technical Quiz || Heat Exchangers
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Question 1
A balanced counter flow heat exchanger has inlet and outlet temperatures of the fluid receiving the heat as 20℃and 40℃. The LMTD of the heat exchanger is 35℃. If the exit temperature of the fluid which transfers the heat to the other fluid is 55℃, determine the inlet temperature of the fluid.
Question 2
Determine the mass flow rate of the water entering the radiator of an automobile at 370K and leaves at 300K. The air in cross flow enters at 0.62 kg/s, cools the water and leaves at 270 K. If heat transfer rate is 14.732 kW, and take specific heat = 4209 J/kgK.
Question 3
In a solar assisted air conditioning system, 0.5 kg/s of ambient air at 270 K is to be preheated by the same amount of air leaving the system at 295 K. If a counter flow heat exchanger has an area of 30 m2, and the overall heat transfer coefficient is estimated to be 25 W/m2-K, then what is the effectiveness of the heat exchanger?
[Take
for air as 
]
[Take
for air as ] Question 4
The equation of effectiveness ϵ = 1 – e-NTU for a heat exchanger is valid in the case of
Question 5
In a certain Heat Exchanger, both fluids have R=1. The hot fluid enters at 70 C and leaves at 40 C;cold fluid enters at 20 C and leaves at 50 C . Effectiveness of the exchanger is
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May 11ESE & GATE ME
