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Introduction to Fuel Cell Technology

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الكلية كلية الهندسة/المسيب     القسم هندسة الطاقة     المرحلة 3
أستاذ المادة وسام جليل خضير       22/08/2017 07:53:24
1.1 What is a fuel cell?
Fuel cell is an electrochemical device that converts chemical energy of a fuel
(hydrogen, natural gas, methanol...etc.) and an oxidant (air or oxygen) into electrical
energy directly, promising power generation with high efficiency and low
environmental impact. Most fuel cell power systems comprise a number of
components:
• Unit cells, in which the electrochemical reactions take place
• Stacks, in which individual cells are modularly combined by electrically
connecting the cells to form units with the desired output capacity
• Balance of plant which comprises components that provide feed stream
conditioning (including a fuel processor if needed), thermal management, and
electric power conditioning among other ancillary and interface functions.

Fuel Cell vs. Battery
? In principles, a fuel cell operates like a battery. Unlike a battery, a fuel cell does not
run down or requires recharging. It will produce energy in the form of electricity and
heat as long as fuel is supplied. While a battery must be replaced (disposed of) or
recharged when its active materials are consumed.
? In a fuel cell, the active materials are supplied from an external source, while the
active materials are stored inside the battery. In fact, a battery is an energy storage
device, and
? The electrode materials of a fuel cell are inert (provide catalytic sites for the active
materials to react) and are typically not consumed like the electrodes in a battery.

Fuel Cell vs. Heat Engine
The following points show the differences:-
? Because the intermediate steps of producing heat and mechanical work typical of most
conventional power generation methods are avoided, fuel cells are not limited by
thermodynamic limitations of heat engines such as the Carnot efficiency, and
? In addition, because combustion is avoided, fuel cells produce power with minimal pollution.
? Note: it is commonly expressed that a fuel cell is more efficient than a heat engine because it is not
subject to Carnot Cycle limitations (second law of thermodynamics).
? Comment: this statement is misleading. A more suitable statement for understanding differences
between the theoretical efficiencies of fuel cells and heat engines is that if a fuel cell is compared to an
equivalent efficiency heat engine, the fuel cell is not limited by temperature as is the heat engine.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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