HEAT TRANSFER EXERCISE 12 JUNE.docx - HEAT TRANSFER CMT470 EXERCISE TOPIC 7 NURUL AMIRAH BINTI AZLAN 2019892654 Date submission 1 When is a heat

# HEAT TRANSFER EXERCISE 12 JUNE.docx - HEAT TRANSFER CMT470...

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HEAT TRANSFER CMT470 EXERCISE TOPIC 7 NURUL AMIRAH BINTI AZLAN 2019892654 Date submission : (12/6/2020) 1. When is a heat exchanger classified as being compact? A heat exchanger with the area density β >700 m 2 /m 3 is classified as being compact. For example, car radiator and human lung. It has a large heat transfer surface area per unit volume. 2. Draw a 1-shell pass and 6-tube passes shell-and-tube heat exchanger. 3. What is the primary reason for using so many tube passes? Primary reason is to increase the contact between fluids so that higher heat transfer coefficient is achieved.
4. What are the heat transfer mechanisms involved during heat transfer from the hot to the cold fluid? The mechanism involved during the heat transfer in a liquid to liquid het exchanger from the hot to the cold fluid is due to convection and conduction. Heat is transferred from hot fluid to wall is due to convection, heat transferred through the wall is by the conduction and finally from the wall to the cold fluid is due to the convection. If the difference in the temperature

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