Some properties of a certain glass are listed here: Density 2300 kg/m³
Specific heat capacity 840 J/kg ∙ C°
Coefficient of thermal expansion 8.5 × 10^-6 (C°) ^-1
Thermal conductivity 0.80 W/m ∙ C°
A glass window pane is 2.7 m high,2.4 m wide,and 9.0 mm thick.The temperature at the inner surface of the glass is $19 ^ { \circ } \mathrm { C }$ and at the outer surface 4°C.How much thermal energy is lost each hour through the window?

Question

Some properties of a certain glass are listed here: Density 2300 kg/m³
Specific heat capacity 840 J/kg ∙ C°
Coefficient of thermal expansion 8.5 × 10^-6 (C°) ^-1
Thermal conductivity 0.80 W/m ∙ C°
A glass window pane is 2.7 m high,2.4 m wide,and 9.0 mm thick.The temperature at the inner surface of the glass is

19 ^ { \circ } \mathrm { C }

and at the outer surface 4°C.How much thermal energy is lost each hour through the window?

Quizplus · Accepted Answer

The thermal energy lost per hour can be calculated using the formula: $ Q = \frac{k \cdot A \cdot \Delta T \cdot t}{d} $, where $ k $ is the thermal conductivity, $ A $ is the area, $ \Delta T $ is the temperature difference, $ t $ is the time, and $ d $ is the thickness. Substituting the given values, the energy lost is approximately $ 3.1 \times 10^7 $ J.

Some Properties of a Certain Glass Are Listed Here: Density 19∘C19 ^ { \circ } \mathrm { C }19∘C

Some Properties of a Certain Glass Are Listed Here: Density $19 ^ { \circ } \mathrm { C }$