Question

Width, height, thickness and thermal conductivity of a single pane window and the air space of a double pane window. Representative winter surface temperatures of single pane and air space. FIND: Heat loss through single and double pane windows.

Answer 1

Complete Question

The schematics is shown on the first uploaded image

Answer:

For single pane is  $Q =1.96 *10^{4}} \ W$  

For  double pane is  $Q_2 = 120 \ W$

Explanation:

Generally the heat loss through  a single pane is mathematically represented by  Fourier’s law as

      $Q = k_g * H^2 * \frac{ T_1 - T_2 }{L}$

=>    $Q = 1.4 * 2^2 * \frac{ 15 -(-20) }{ 5 * \frac{1 \ m}{1000 \ mm}}$

=>    $Q =1.96 *10^{4}} \ W$        

Generally the heat loss through  a double pane is mathematically represented by  Fourier’s law as

      $Q_2 = k_a * H^2 * \frac{ T_1 - T_2 }{L}$

=>    $Q_2 = 0.024 * 2^2 * \frac{ 10 -(-15) }{ 10 * \frac{1 \ m}{1000 \ mm}}$

=>    $Q_2 = 120 \ W$