Question

If we use 12mm thick special glass in the windows of a room instead of 3 mm thick ordinary class and the temperature inside the room is higher than that outside by 10 degree celsius then how much heat per hour will be prevented from going out the total area of the glass is a 555 and the thermal conductivity is 2 into 10 power minus 4

Answer 1

Answer:

Total heat prevented to flow out due to thick glass is 9000 k cal/hr

Explanation:

As we know that heat transfer by conduction mode is given as

$\frac{dQ}{dt}= kA\frac{dT}{dx}$

now we will have heat transfer for thick glass

$\frac{dQ}{dt} = (2\times 10^{-4})(5)(\frac{10}{12\times 10^{-3}})$

$\frac{dQ}{dt} = 0.83 kCal/s$

now we will have heat transfer for thin glass

$\frac{dQ}{dt} = (2\times 10^{-4})(5)(\frac{10}{3\times 10^{-3}})$

$\frac{dQ}{dt} = 3.33 kCal/s$

Heat prevented to flow out is given as

$\frac{dq}{dt} = (3.33 - 0.83) kCal/s$

$\frac{dq}{dt} = 2.5 kcal/s$

so heat loss per hour is given as

$\frac{dq}{dt} = 9000 kcal/hr$

#Learn

Topic : Thermal conduction

https://brainly.in/question/13307770

Answer 2

Answer:

above answer is correct .please mark the person brainilist