Simulation Quiz 2

Heat Transfer for Structures - Simulation Quiz 2

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1 / 10

Ignore the interior convective heat transfer, as we have done in this simulation, and compare the maximum temperature of the food in System C (“Open Door with Food”) with the maximum temperature of the food in System A (“Closed Door with Food”). Which best reasonable conclusion can be drawn?

Broiling food with the door open results in a small increase (< 5 °C) in the temperature of the food.

Broiling food with the door open results in a moderate drop (< 20 °C ) in the temperature of the food.

Broiling food with the door open has no effect on the temperature of the food.

Broiling food with the door open results in a dramatic drop (> 50 °C) in the temperature of the food.

2 / 10

In System B (“Food Wrapped in Foil”), the maximum temperature of the heating element is _____.

Between 575-624 °C

Between 525-574 °C

Between 625-674 °C

Between 475-524 °C

3 / 10

In System C (“Open Door with Food”), the maximum temperature of the heating element is _____.

Between 425-474 °C

Between 575-624 °C

Between 475-524 °C

Between 525-574 °C

4 / 10

In System A (“Closed Door with Food”), the maximum temperature of the food is _____.

Between 150-174 °C

Between 200-224 °C

Between 225-249 °C

Between 175-199 °C

5 / 10

In System A (“Closed Door with Food”), what is the reflected radiative heat flow rate (Reflected Radiation) of the heating element?

Between 20-29 W

Between 30–39 W

Between 10-19 W

Between 0-9 W

6 / 10

In System B (“Food Wrapped in Foil”), compare the absorbed radiative heat flow rate of the food (Emitted Radiation) to the net radiative heat flow rate (Outgoing Net Radiation) of the heating element. What fraction of the heat flow rate from the heating element is being absorbed by the food? (Recall that absorbed radiation = emitted radiation for bodies in thermal equilibrium.)

Between 0.01-0.05

Between 0.11-0.15

Less than 0.01

Between 0.06-0.10

7 / 10

In System A (“Closed Door with Food”), looking at the temperature distribution on the food body only, why does temperature distribution show the food is hotter on the +Y side versus the –Y side.

The heating element does not have uniform temperature and is hotter in the +Y direction, hence the food is warming more in that direction also.

The food has orthotropic thermal conductivity.

The food is hotter where it is closer to the heating element.

There is interior convection causing the temperature distribution to vary.

8 / 10

In System A (“Closed Door with Food”), what is the net radiative heat flow rate (Outgoing Net Radiation) of the heating element?

Between 725-774 W

Between 775-824 W

Between 875-924 W

Between 825-874 W

9 / 10

Calculate the approximate amount of radiative heat flow rate lost to the ambient environment in System C (“Open Door with Food”) by subtracting the heat flow rate of the exterior Convection boundary condition from ~1000W of input power. Recall that input power is our internal heat generation multiplied by the volume of the heating element.

425-524 W

225-324 W

125-224 W

325-424 W

10 / 10

The grill is a shiny metal and has low emissivity. In System A (“Closed Door with Food”), what is the reflected heat flow rate (Reflected Radiation) of the grill?

Between 475-524 W

Between 375-424 W

Between 425-474W

Between 325-374 W

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Heat Transfer In Structures

Thermal Radiation in an Oven

Total Available Time - 30 mins

Total Number of Questions - 10