FE Mechanical Exam Prep 79, Heat Exchangers LMTD and Effectiveness NTU
Nov 4, 2026
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.
In this episode you will learn:
- How to choose between the LMTD and Effectiveness-NTU methods based on known inlet and outlet temperatures.
- The correct procedure for calculating the Log Mean Temperature Difference (LMTD) for both parallel-flow and counter-flow heat exchangers.
- How to apply the effectiveness-NTU method, including the concepts of heat capacity rates (C_min, C_max) and the maximum possible heat transfer rate (q_max).
- Common exam traps like confusing temperature differences in LMTD calculations or using the wrong heat capacity rate for q_max.
- The importance of starting every heat exchanger problem with a fundamental energy balance.
For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep
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