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Heat flow rate : ウィキペディア英語版
Rate of heat flow

The rate of heat flow between two systems is measured in watts (joules per second).
The formula for rate of heat flow is ∆Q/∆t = -K×A×∆T/x,
where ∆Q/∆t is the rate of heat flow; -K is the thermal conductivity factor; A is the surface area; ∆T is the change in temperature and x is the thickness of the material (∆T/x is called the temperature gradient and is always negative because of the heat of flow always goes from more thermal energy to less).
==Example==
Assume there are two systems with the same mass and specific heat. System A has an average temperature of 500 kelvin and system B has an average temperature of 400 K. If thirty seconds after the systems are put in contact they both reach 450 K, then the average rate of heat flow is:
50 J/30 s, or rather 1.67 W.
(note: specific heat capacities = 1 J/(kg K) and masses = 1 kg)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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