The relationship between the Fahrenheit scale the Celsius scale, and the
Rankine and Kelvin scales.
Fahrenheit, oF = 32.0 + (9/5)oC ..... Celsius, oC = (oF - 32.0)(5/9)
Rankine, oR = oF +460 ..... Kelvin, oK = oC + 273
|metal [Material]||Symbol, Atomic||Thermal Value|
Copper Wire Ampacity AWG Table for Copper Wire
Aluminum Wire Ampacity AWG Table for Aluminum Wire
Printed Wiring Board Information PWB Trace heating
Component Heat Derating
The world climate map shows the four basic climate regions as Hot, Basic, Cold, and Severe Cold.
Most of the worlds land masses are defined as Basic as defined by the DOD standard.
The map does not define the ocean regions, even though their shown as clear.
Ambient Temperature - Ambient temperature is the temperature immediately surrounding the equipment.
Ambient Cooled Equipment - Ambient cooled equipment dissipates its heat to its ambient environment (without ventilation induced by the vehicle). Equipment containing fans or blowers to circulate ambient air through the unit shall be classified as ambient cooled.
Design flow rate - Design flow rate is the minimum flow rate necessary to maintain all components within the unit at specified temperature requirements.
Forced (externally) cooled equipment - Forced cooled equipment is that equipment designed to be cooled by gas, including air and ram air, or liquid, supplied by the vehicle subsystems with sufficient pressure to flow through the unit and remove the dissipated heat.
Sea level ambient pressure and temperature - Sea level ambient pressure is defined as 14.7 psia + 5 percent. Sea level ambient temperature is defined as 59oF +2oF (15oC +1oC).
Stabilization - A stabilized thermal condition has been attained when the indicated temperature of the component with the largest thermal time constant varies at a rate less than 3.6oF [2oC] per hour.
Heat Sinks/Cooler Manufacturers: Mechanical Components-IC Accessories
Thermal Adhesive Manufacturers: Mechanical Components-Thermal Adhesive
Desiccant to absorb moisture.