EFPLAB2: Energy Balance

Heated Air Channel Animation

• Only stationary operating points are displayed

• Air channel can be considered frictionless and heat loss free

• The air has a constant specific heat capacity

Fan Voltage: V

Heating Power: W

Variable:

Formula:

Formula with numeric values:

Result:

Air volume flow rate

{\dot{V}}_{a i r}

A \cdot c_{a i r}

0.00001 m^{2} \cdot 2 \frac{m}{s}

5 \frac{m^{3}}{s}

Air mass flow rate

{\dot{m}}_{a i r}

{\dot{V}}_{a i r} \cdot ρ_{a i r}

5 \frac{m^{3}}{s} \cdot 1.2 \frac{k g}{m^{3}}

5 \frac{k g}{s}

Temperature difference

Δ T_{a i r}

(\frac{\dot{Q} + P_{e l, f a n} \cdot (1 - η_{f a n})}{{\dot{m}}_{a i r} \cdot c_{p, a i r}})

(\frac{250 W + 10 W \cdot (1 - 0.3)}{5 \frac{k g}{s} \cdot 1006 \frac{J}{k g \cdot K}})

30 K

Air temperature at the outlet

ϑ_{a i r, ω}

Δ T + ϑ_{a i r, α}

5 K + 20 ° C

30 ° C