Class 4 (4th Engineer) MEKG 📅 May 2023

Exam Question

(a) What is the basic function of heat exchanger? (3)

(b) Draw a line diagram showing the temperature gradient between the fluids at an intermediate heat conductive wall of a heat exchanger. (3)

(i) Parallel flow

(ii) Contraflow

(iii) Turbulent flow.

(iv) Streamline flow (for liquid inside tubes)

Reference Answer

### (a) Basic Function of a Heat Exchanger (3 Marks)
The fundamental function of a heat exchanger is to facilitate the transfer of thermal energy (heat) from a hotter fluid to a colder fluid, without the two fluids coming into direct contact and mixing. This process is governed by the principles of thermodynamics.
Key aspects of its function include:
1. **Heat Transfer Mechanism:** Heat transfer occurs in two primary stages:

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