The door of an industrial furnace is $2 \text{ m} \times 4 \text{ m}$…
Previous year question for HEAT TRANSFER.
Question
The door of an industrial furnace is $2 \text{ m} \times 4 \text{ m}$ in surface and is to be insulated to reduce the heat loss to not more than $1200 \text{ W/m}^2$. The interior and exterior walls of the door are $10\text{mm}$, $7\text{mm}$ thick steel sheets ($k = 25 \text{ W/m K}$). Between these two sheets, suitable thickness of insulation material is to be placed. The effective gas temperature inside the furnace is $1200^{\circ}\text{C}$ and overall heat transfer coefficient between the gas and door is $20 \text{ W/m}^2\text{K}$. The heat transfer coefficient outside the door is $5 \text{ W/m}^2\text{ }^{\circ}\text{C}$. The surrounding air temperature is $20^{\circ}\text{C}$. Select suitable insulation material and its size? [20]
- Year: 2018
- Subject: HEAT TRANSFER