Thermal Conduction Homework: Oven Glass Heat Flow in 1hr

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To determine the heat flow through the oven glass, the formula Q=tkA(θ2-θ1)/x is applied, where Q is the heat transfer, t is time, k is thermal conductivity, A is the area, θ2 is the oven temperature, θ1 is the kitchen temperature, and x is the thickness of the glass. The user calculated Q to be 6.9 MJ, while the expected answer is 6.2 MJ. The discrepancy arises from the assumption of the kitchen temperature, which was not specified in the problem; the user assumed 0°C instead of a typical room temperature. Clarification on the kitchen temperature is essential for accurate calculations. The discussion emphasizes the importance of understanding all variables in thermal conduction problems.
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Homework Statement


The door of an oven has a piece of glass of dimensions 20cm X 30 cm and thickness 0.50cm.when the interior of the oven is at temperature 200°C,determine the quantity of heat that flow through the glass in one hour.(for glass,K=0.80 Wm^-1K^-1)


Homework Equations


Q=tkA(θ2-θ1) /x


The Attempt at a Solution


Q=(3600)(0.80)X(0.2x0.3)(200) / (0.50 x 10^-2)

THe answer given is 6.2MJ.i get 6.9MJ.WHY?please help me to solve this question.
 
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What is the temperature of the kitchen?
 
the question din given
 
So you assumed zero °C rather than a typical room temperature?
 
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