Thermal Conduction Homework: Oven Glass Heat Flow in 1hr

In summary, the conversation discusses determining the quantity of heat that flows through a piece of glass on the door of an oven, with dimensions of 20cm x 30cm and thickness of 0.50cm, when the interior of the oven is at a temperature of 200°C. The equation Q=tkA(θ2-θ1) /x is used to calculate the heat flow, with a given value of K=0.80 Wm^-1K^-1 for the glass. The solution attempted was Q=(3600)(0.80)X(0.2x0.3)(200) / (0.50 x 10^-2), resulting in an answer of 6.9MJ instead
  • #1
hoyy1kolko
10
0

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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  • #2
What is the temperature of the kitchen?
 
  • #3
the question din given
 
  • #4
So you assumed zero °C rather than a typical room temperature?
 
  • #5


As a scientist, it is important to approach problems with precision and accuracy. In this case, there may be a slight error in your calculation that is causing the difference in the answer. I recommend double-checking your calculation and making sure all units are consistent. It may also be helpful to show your work so that others can help identify any potential mistakes. Additionally, it is always a good idea to use significant figures and round your final answer to the appropriate number of decimal places. Overall, it is important to pay attention to detail and be thorough when solving scientific problems.
 

Related to Thermal Conduction Homework: Oven Glass Heat Flow in 1hr

1. How does thermal conduction work in an oven?

Thermal conduction in an oven occurs when heat is transferred from the heat source (such as a heating element) to the objects inside the oven through direct contact. This process is known as conduction and is responsible for cooking the food in the oven.

2. What factors affect thermal conduction in an oven?

The main factors that affect thermal conduction in an oven include the type and thickness of the oven glass, the temperature of the heating element, the type of food being cooked, and the duration of cooking. All of these factors can impact the rate at which heat is transferred and therefore affect the cooking time and temperature of the food.

3. How does the type of oven glass affect heat flow in an hour?

The type of oven glass can have a significant impact on the heat flow in an hour. Thicker glass will have a higher thermal resistance, which means it will take longer for the heat to transfer through the glass. This can result in longer cooking times. On the other hand, thinner glass will have a lower thermal resistance and allow for faster heat transfer, resulting in shorter cooking times.

4. Can the cooking time be reduced by using a different type of oven glass?

Yes, using a different type of oven glass can potentially reduce the cooking time. As mentioned before, thinner glass will have a lower thermal resistance and allow for faster heat transfer, resulting in shorter cooking times. However, it is important to note that other factors such as the temperature and type of food being cooked also play a role in the cooking time.

5. How can the heat flow in an hour be calculated for a specific oven glass?

The heat flow in an hour can be calculated by using the formula Q/t = kAΔT/L, where Q is the heat flow (in watts), t is the time (in seconds), k is the thermal conductivity of the oven glass, A is the surface area of the glass, ΔT is the temperature difference between the two sides of the glass, and L is the thickness of the glass. By plugging in the specific values for these variables, the heat flow in an hour can be calculated for a specific oven glass.

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