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GATE 2022 ME: Heat-Transfer Quiz - 4

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Question 1

For the parallel flow heat exchange the effectiveness is 0.4 and capacity ratio is unity, then NTU is___.

Question 2

In the counter flow heat exchange, for the hot fluid the specific heat is 3 kJ/kg K, mass flow rate is 6 kg/s, inlet temperature is 150 °C and outlet temperature is 100 °C. For the cold fluid, the  specific heat is 3 kJ/kg K, mass flow rate is 8 kg/s, inlet temperature is 20 °C . Neglecting the heat transfer to surrounding, the outlet temperature of the cold fluid in °C is ________.

Question 3

For a balanced counter flow heat exchanger if the effectiveness is 0.4, then find the number of transfer units _______________.

Question 4

In a counter flow heat exchanger, water is heated from 30°C to 60°C with flow rate of 2kg/s by an oil having temperature of 110° and 70°C at inlet and outlet respectively and flow rate of 3 kg/s. The specific heats of water and oil are 4.2 KJ/kg-k and 2.1 kJ/kg-K respectively. Find the maximum possible heat transfer (in kW) between the fluids.

Question 5

Consider the following statements regarding the compact heat exchangers

1) Compact heat exchangers are characterised by area density which is the heat transfer area available per unit volume.

2) In compact heat exchangers, the two fluids usually move perpendicular to each other.

3) One of the basic features of compact heat exchangers is that these are of unmixed type.

Which of the following statements is/are correct?

Question 6

Air enters a duct at 20 at a rate of 0.1 m3/s, and it is heated to 150 by steam condensing outside the duct at 200. The log mean temperature difference (LMTD) for the heat exchanger is
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