FE Exam Heat Transfer | Counter Flow Heat Exchanger – LMTD and Overall Heat Transfer Coefficient

🧪 Try this problem interactively: https://www.fe-interactive.com/practi... 📺 Full FE Mechanical Problem Playlist:    • FE Example Problems   --- 📈 Preparing for the FE Mechanical Exam? If you’ve been grinding through study guides and YouTube videos but still don’t feel ready, here’s the truth: You’re not supposed to memorize everything — you’re supposed to master the engineering fundamentals. That’s what we do at FE Interactive. You’ll solve problems that actually teach you how to think like an engineer — so you can walk into the exam with confidence and clarity. --- 🎯 Special Launch Offer – 2 Months for $9.99 Ready to finally feel prepared? https://www.fe-interactive.com/custom... Inside FE Interactive, you’ll get: ✅ 500+ FE-style problems that build real understanding ✅ Full-length timed exams that simulate test day pressure ✅ Smart analytics to identify and fix your weak spots ✅ TI-36X Pro calculator tips that save time when it matters ✅ Practice using the NCEES FE Handbook — just like on exam day This isn’t another cram session. It’s a system built to help you actually pass. --- 🧠 FE Exam Prep | Heat Exchangers – Solving for Overall Heat Transfer Coefficient (U) In this video, we walk through a real-world heat exchanger problem: Hot oil at 212°F enters a well-insulated exchanger and is cooled by water flowing from 68°F to 113°F. Given mass flow rates and specific heats for both fluids, plus the total heat transfer area, you’ll solve for the **overall heat transfer coefficient, U**. This problem uses the *log mean temperature difference (LMTD)* method — a key tool in your FE exam toolbox. --- ✅ You’ll Learn How To: Use energy balance to determine the total heat transferred Apply the LMTD method correctly for a counterflow setup Convert all units (Btu, lbm, °F) cleanly and consistently Solve for $U$ using the rearranged heat exchanger equation --- 📘 Topics Covered in This Video: • Heat exchanger energy balances • Log mean temperature difference (LMTD) • Overall heat transfer coefficient (U) • Btu/hr unit consistency in thermal calculations --- 💡 Why This Matters: Heat exchanger questions on the FE exam test both conceptual understanding and accurate application of energy equations. This walkthrough shows you exactly how to compute *U* — and what each term physically represents. --- 💬 Got questions or topics you’re struggling with? Drop a comment below — I read every one and make videos based on what YOU need help with. --- 🔔 Like, subscribe, and turn on notifications for more FE prep content every week! --- #FEExam #FEMechanical #HeatTransfer #HeatExchanger #LMTD #ThermalAnalysis #EngineeringFundamentals #PassedTheFE #FEInteractive #EngineerInTraining