2142-391 Engineering Mechanical Laboratory Cross Flow Heat Exchanger

1. 2142-391 Engineering Mechanical LaboratoryCross Flow Heat Exchanger Prof. Somsak Chaiyapinunt, Ph.D. Section Friday Prepared by Nattadate Fuangworawong, Ph.D.

2. 1. Introduction • Whenever there is a temperature difference in the medium, there will be a transfer of energy in term of heat. • Heat can transfer from high temperature to low temperature in three modes: • Conduction (transfer heat across a solid) • Convection(transfer heat across a fluid) • Radiation (no medium need in order to transfer heat)

3. 1. Introduction • A heat exchanger is a device used to transfer heat from one fluid to another. Air conditioning system of Automotive

4. 1. Introduction • A heat exchanger is a device used to transfer heat from one fluid to another. Air conditioning system of room

5. 1. Introduction • A heat exchanger is a device used to transfer heat from one fluid to another. Nuclear power plant (Pressurized Water Reactor )

6. Condenser of Chiller 1. Introduction There are many different types of heat exchangers. For example, • shell and tube heat exchanger

7. Condenser of refrigeration system 1. Introduction There are many different types of heat exchangers - shell and tube heat exchanger • plate and frame heat exchanger

8. We will study on this heat exchanger Air-cooled condenser 1. Introduction There are many different types of heat exchangers • shell and tube heat exchanger • plate and frame heat exchanger • cross flow heat exchanger

9. 1.2 Motivation The understand of the performance of the heat exchanger in term of heat transfer and pressure drop becomes essential to the design engineers The heat transfer that occurs in the heat exchanger is usually dominated by convection mode.

10. 1.3 objective • To determine the average heat transfer coefficient and pressure drop for a heated tube within a tube bank at different flow rates.

11. Question ??????