Heat Transfer|HW1

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本文探讨了热力学和传热学的基本概念，解释了热作为热能的定义，以及热传递的概念，其取决于傅里叶定律。文章进一步阐述了热力学在系统平衡状态的应用，而传热学则关注系统非平衡状态下的温度差异。文中还介绍了热力学基本定律在传热学中的广泛应用。

The introduction of the Heat Transfer and Thermodynamics

Heat = Thermal energy
Heat transfer means the rate of the heat transfer, which is depended on the Fourier’s Low

$\Phi=-\lambda A \frac{d T}{d x}$

and we assume the continuum assumption is valid.

Thermodynamics: system at equilibrium state.
Heat transfer: system at non-equilibrium state (temperature difference).
The main variables in heat transfer include the dimension T-1: the main concern is the rate of energy transfer
Basic laws in thermodynamics are widely applied in the heat transfer(First law : The internal energy of an isolated system is constant.Second law: Heat cannot flow from a colder location to a hotter location)