Conduction

$$Q=\lambda \frac{T_1-T_2}{\Delta x}\cdot A\cdot \Delta t$$

• $T_1-T_2$ emperature difference
• $A$ area
• $\Delta t$ time interval
• $\Delta x$ wall thickness
• $\lambda$ thermal conductivity

Fourier’s law of conduction

Wärmestromdichte:

$${\dot{q}}_x=-\lambda \cdot \frac{dT}{dx}$$

Wärmestrom:

$$\dot{Q}=-\lambda \cdot A\cdot \frac{dT}{dx}$$