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ASME Hot Air Rises and Heat Sinks: Everything You Know about Cooling Electronics is Wrong
240 стр.
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Описание

By Tony Kordyban 

Here is a collectionof myths, mistakes, and "lessons learned" from practicing engineersinvolved in the field of electronic equipment cooling. Throughanecdotes and stories based on his experiences at TellabsOperations, Inc., Tony Kordyban covers the basic dimensions of heattransfer concepts - mostly from real problems that were incorrectlysolved at least once before a correct technique was applied.

This book contains simple line drawings to help illustrate thebasic concepts, while the text provides accurate and completetechnical explanations. Its case-study approach makes it anextremely useful and handy reference - and Kordyban's clear andentertaining writing style, which mixes technical subject matterwith humor, is both interesting and instructive.

For the popular sequel to this book, click here:  MORE HOT AIR, by TonyKordyban.


TABLE OF CONTENTS

Chapter 1: We Don't SellAir................................................1

Our hero (the author) discovers that his new employer has writtensome engineering folklore into product design requirements. Shouldyou measure the actual product temperature, or only the temperatureof the air coming out of the vents in the back?Lesson: Junction temperature as the source of thermaltrouble.

Chapter 2: Every Temperature Tells aStory.........................9
How hot would a resistor have to be to actually glow? Higher orlower than the melting point of solder? Lab legends always mentionglowing components or melting solder, but how hot would thatactually be? And what is the ideal serving temperature for icecream? Lesson: Putting some landmarks on thetemperature scale.

Chapter 3: Climate Control Isn'tNatural.............................15
Herbie learns that an environmental chamber is only good fortesting products that will eventually be used only in environmentalchambers. Lessons: Natural vs. forced convection;thermal runaway.

Chapter 4: Diamond Is a GAL's BestFriend.........................21
Read the fine print on that thermally conductive epoxy. It may be50% better than the nonthermal epoxy, but as a conductor it stillmakes a pretty good insulator. Lesson: Thermalconductivity.

Chapter 5: Lines in theSand..............................................31
Don't tell a circuit designer which board layout gives the worstthermal performance. He or she will choose it as the only one thatwill work electrically. Lesson: Introduction to CFD(computational fluid dynamics).

Chapter 6: When Is a Heat Sink Not a HeatSink?.................39
More folklore from EE-land about how aluminum has the magicalability to absorb heat like a sponge and send it off to a paralleluniverse. Lessons: Convection and surface area;conduction.

Chapter 7:Trade-Offs.......................................................47
There are trade-offs between electrical performance, cost, andtemperature, so it doesn't pay to be TOO cool.Lesson: Junction temperature operating limits.

Chapter 8:Cfmophobia.....................................................53
A whole company is infected with fear of Rotary Gas AccelerationDevices (fans). Lessons: Fans have a lot of drawbacksthat justifiably make people afraid of them, so it is best to planthem in from the very beginning.

Chapter 9: Sieve CoolingSystem........................