Question

the cross sectional area of a brick wall is 2.0m^2 and its thickness is 12cm if thedifference of temperature between the two sides of the wall is 24℃ calculate the amount of heat flowing through the wall in 1 hour the thermal conductivity of brick is 0.13​

Answer 1

hence, 187.2kJ amount of heat flowing through the wall in 1 hour.

cross sectional area of brick wall, A = 2m²

thickness , x = 12cm = 0.12 m

Temperature difference, ∆T = 24°C

thermal conductivity of brick, K = 0.13 W/m.°C

time duration, ∆t = 1 hour = 3600 sec

using formula, ∆Q/∆t = KA ∆T/x

⇒∆Q = KA ∆T/x × ∆t

= 0.13 × 2 × 24/0.12 × 3600

= 26 × 24 × 300

= 187200 J

= 187.2 kJ

hence, 187.2kJ amount of heat flowing through the wall in 1 hour .

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Answer 2

$\huge\bold\purple{Answer:-}$

cross sectional area of brick wall, A = 2m²

thickness , x = 12cm = 0.12 m

Temperature difference, ∆T = 24°C

thermal conductivity of brick, K = 0.13 W/m.°C

time duration, ∆t = 1 hour = 3600 sec

using formula, ∆Q/∆t = KA ∆T/x

⇒∆Q = KA ∆T/x × ∆t

= 0.13 × 2 × 24/0.12 × 3600

= 26 × 24 × 300

= 187200 J

= 187.2 kJ

hence, 187.2kJ amount of heat flowing through the wall in 1 hour .