Types of Heat Exchangers – Classification of Heat Exchangers
- parallel-flow arrangement. In the parallel-flow arrangement, the hot and cold fluids enter at the same end, flow in the same direction, and leave at the same end.
- counter-flow arrangement. In the counter-flow arrangement, the fluids enter at opposite ends, flow in opposite directions, and leave at opposite ends.
Figure represents the directions of fluid flow in the parallel and counter-flow exchangers. Under comparable conditions, more heat is transferred in a counter-flow arrangement than in a parallel flow heat exchanger. The temperature profiles of the two heat exchangers indicate two major disadvantages in the parallel-flow design.
- The large temperature difference at the ends causes large thermal stresses.
- The temperature of the cold fluid exiting the heat exchanger never exceeds the lowest temperature of the hot fluid.
The design of a parallel flow heat exchanger is advantageous when two fluids are required to be brought to nearly the same temperature.
- Heat Exchangers
- Types of Heat Exchangers – Classification of Heat Exchangers
- Heat Exchanger Analysis – Heat Exchanger Calculation
- Overall Heat Transfer Coefficient
- Logarithmic Mean Temperature Difference – LMTD
- LMTD – Condensers and Boilers
- Pinch Point – Heat Exchanger
- NTU Effectiveness Method
- Example: Calculation of Heat Exchanger
- Recuperator and Regenerative Heat Exchanger
- Heat Transfer