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Saturday, February 3, 2018

thermal resistance

Observations indicate that in system involving flow of fluid , heat & electercity, the flow quantity is directly proportional to the driving potential & inversaly proportional to the flow resistance. In a hydroullic circuit , the preassure along the path is the driving potential & the voltage potential & electric resistance of the materia. Likewise, temprature diffrence constitutes the driving force for heat conduction through a medium. From ohm's law:- Current(i)= voltage potentia(dV)/electrical resistance(Re) & from fourier's law:- Heat flow rate =temprature potential/thermal resistance Q=dt/(dx/kA) Note:- »Electric current is analogous to thermal heat flow rate (kj/hr.) »volts corresponds to thermal temprature diffrence(°k) »electric resistance(ohms) is analogus to quantity dx/kA this quantity calledTHERMAL RESISTANCE.

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