(#98) Fuel Cells Cheat The Carnot Limit

(#98) Fuel Cells Cheat The Carnot Limit

This episode breaks down the thermodynamic principles and real-world engineering of fuel cells, explaining how they convert chemical energy directly into electricity without the Carnot limits that constrain traditional heat engines. Learn how Gibbs free energy defines the maximum electrical work output, how Faraday’s constant and reaction valency determine cell voltage, and why fuel cells maintain high efficiency even under part-load conditions. We walk through hydrogen-oxygen and hydrogen-chlorine systems, analyze how temperature and pressure affect electromotive force, and examine why irreversible losses such as internal resistance and concentration gradients reduce real-world performance. Designed for mechanical, chemical, and energy engineers, this episode connects electrochemistry, thermodynamics, and system design to reveal how modern fuel cells achieve high efficiency and where their practical limits truly lie.

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Jaksot(215)

Physics of the Invisible Ocean

Physics of the Invisible Ocean

Physics of the Invisible Ocean

4 Syys 22min

Why production tanks ruin lab chemistry - How to scale-up your mixer batch.

Why production tanks ruin lab chemistry - How to scale-up your mixer batch.

Discover Why Production Tanks Ruin Lab Chemistry — Lab mixers blend a beaker in seconds. The same recipe in a plant tank takes far longer to become uniform. Blend time rises, power per volume falls, d...

3 Syys 57min

Numerical Methods for Predicting Structural Stress

Numerical Methods for Predicting Structural Stress

If the mesh is fine enough to look smooth, why does the peak stress still jump every time we refine it?Discover How Numerical Methods Solve Stress When Equations Fail — When geometries, boundaries, or...

28 Elo 1h 4min

Fixing Misaligned Shafts and Destructive Vibrations

Fixing Misaligned Shafts and Destructive Vibrations

If the force grows with speed squared, why do we still run the machine harder instead of balancing it first?Discover How to Fix Misaligned Shafts and Destructive Vibrations — An unbalanced mass at ecc...

27 Elo 45min

Engineering Systems to Survive Mechanical Shock - The Structure Remembers.

Engineering Systems to Survive Mechanical Shock - The Structure Remembers.

Discover How Engineering Systems Survive Mechanical Shock — Shock is a short-duration, high-amplitude pulse whose length is comparable to the system’s natural decay time, producing immediate yielding ...

26 Elo 31min

Should We Trust Mathcad? - Mathematical Realities That Dictate Physical Design.

Should We Trust Mathcad? - Mathematical Realities That Dictate Physical Design.

If the math already proves the column will buckle, why do we still argue about making the rod a little thicker?Discover the Mathematical Realities That Dictate Physical Design — The flexure equation σ...

25 Elo 33min

Why do we keep torquing the bolt when the real load is carried by friction between the plates?

Why do we keep torquing the bolt when the real load is carried by friction between the plates?

Discover How Bolts Rivets and Welds Actually Hold Structures Together — Bolts generate clamping force through controlled preload, locking parts by friction and tensile stress so the joint resists shea...

24 Elo 47min

How Engineers Design Safely With Imperfect Materials

How Engineers Design Safely With Imperfect Materials

Discover How Engineers Design Safely With Imperfect Materials — the reality that every real material carries defects, inclusions, property scatter, and manufacturing variation that perfect textbook pr...

19 Elo 1h 5min

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