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Fantom [35]
3 years ago
6

Width, height, thickness and thermal conductivity of a single pane window and the air space of a double pane window. Representat

ive winter surface temperatures of single pane and air space. FIND: Heat loss through single and double pane windows.

Physics
1 answer:
KonstantinChe [14]3 years ago
5 0

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  

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Now, assuming the distance to the last row is 1947m, the number n of wavelengths that fit into this distance are

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4 years ago
There are 640 acres in a square mile. how many square meters are there in 7.80 acres.
lukranit [14]

Answer:

On 7.8 acres there are 31565.3 square meters

7.8 acres = 31565.3 m²

Explanation:

Conceptual analysis

Acre, square mile and square meter are area units, so their equivalences are in square units.

Known data

1 (mi)² = 640 acres

1 mi = 1609.34 m

Problem development

We know that 1 mile = 1609.34m, then: (1 mile)² = (1609.34m)²=(1609.34)²m²

We apply the known conversion factors to calculate the square meters (X) in 7.8 acres:

X=7.8 acres *\frac{(1 mi)^{2} }{640 acres} * \frac{(1609.34)^{2}m^{2}  }{(1 mi)^{2} }

We eliminate acres and square miles (mi²) because they are in the numerator and denominator, so the answer is in square meters (m²)

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3 years ago
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