SPECIFIER’S GUIDE
Download - McLean Cooling Technology
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Intro Page<br />
Chapter Contents<br />
Selecting A Cooling SolUTION<br />
Overview<br />
Why Cool Electronics in the First Place?.. . . . . . . . . . . . . . . . 4<br />
Heat Ruins Electronics.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4<br />
Sources of Heat .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4<br />
Trend Toward More Damaging Heat. . . . . . . . . . . . . . . . . . . . . 4<br />
The Consequences of Damaging Heat. . . . . . . . . . . . . . . . . . . 4<br />
Conductive Enclosure Cooling.. . . . . . . . . . . . . . . . . . . . . . . . 5<br />
Fresh Air Enclosure Cooling.. . . . . . . . . . . . . . . . . . . . . . . . . . 5<br />
Sealed Enclosure Cooling. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5<br />
Sealed vs. Fresh Air Enclosure Cooling .. . . . . . . . . . . . . . . . . 6<br />
Sealed EnclOSURE Cooling<br />
Introduction.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7<br />
Sealed EnclOSURE Cooling Overview<br />
Air Conditioner Cooling Capacity Overview. . . . . . . . . . . . . . . 8<br />
Part A: Determine Internal Heat Load. . . . . . . . . . . . . . . . . . . 8<br />
Part B: Determining Heat Transfer Load Overview.. . . . . . . . . 9<br />
Simple Chart Method.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9<br />
Determine Total Heat Load.. . . . . . . . . . . . . . . . . . . . . . . . . . 10<br />
Equation Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10<br />
Heat Exchanger Cooling Capacity Overview.. . . . . . . . . . . . . 11<br />
Determine Internal Heat Load. . . . . . . . . . . . . . . . . . . . . . . . .11<br />
Determine Heat Transfer .. . . . . . . . . . . . . . . . . . . . . . . . . . . 11<br />
Determine Heat Exchanger Capacity .. . . . . . . . . . . . . . . . . . 12<br />
Fresh Air EnclOSURE Cooling Overview<br />
Introduction.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13<br />
What Is Airflow?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13<br />
What Is Static Pressure?.. . . . . . . . . . . . . . . . . . . . . . . . . . . 13<br />
How is Performance Characterized?. . . . . . . . . . . . . . . . . . . 14<br />
What Are the Capabilities of Each Air Mover? .. . . . . . . . . . . 14<br />
Airflow Design Options.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15<br />
Choosing an Air Mover .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16<br />
Power Input .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16<br />
Enclosure Protection.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16<br />
Airflow.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16<br />
Step 1. Determine Delta-T (ΔT).. . . . . . . . . . . . . . . . . . . . . . . 17<br />
Step 2. Determine Internal Heat Load .. . . . . . . . . . . . . . . . . 17<br />
Step 3. Determine Free Airflow .. . . . . . . . . . . . . . . . . . . . . . 18<br />
Friendly Reminder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19<br />
Step 4. Estimate System Impedance.. . . . . . . . . . . . . . . . . . 19<br />
Step 5. Select Your Air Mover.. . . . . . . . . . . . . . . . . . . . . . . . 19<br />
1<br />
FRESH AIR ENCLOSURE Cooling<br />
Fresh air cooling, referred to as<br />
an “open-loop system”, ventilates<br />
fresh air through the cabinet,<br />
exhausting heat away from hot<br />
electronics. Fresh air cooling is<br />
optimal when the electronics system<br />
is deployed in a relatively clean and<br />
cool environment, such as an office<br />
building, data networking center or<br />
light-duty factory.<br />
EQUIPMENT PROTECTION SOLUTIONS PH 763.422.2211 • FAX 763.576.3200 • MCLEANCOOLINGTECH.COM<br />
Cooling 3
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