Question

In a copper kettle water is heated. The boiler wall is 2 mm thick. The temperature of the combustion gases is 385 ℃. The size of the contact area of the combustion gases with the boiler is 0.3 m2 . The boiler has a layer of soot 1.2 mm thick and the wall in the boiler is covered with a layer scale of 4mm thickness. head r = 384; carbon black = 0.24; each n = 2.3; rov combustion gas - copper (soot) =; rov copper (scale) - water =;

Calculate the total heat resistance in the copper kettle system.

A) 0.15 K/W
B) 0.27 K/W
C) 0.42 K/W
D) 0.58 K/W

Answer 1

To calculate the total heat resistance in the copper kettle system, we need to consider the resistance of each component of the system.

Step-by-step explanation:

To calculate the total heat resistance in the copper kettle system, we need to consider the resistance of each component of the system. The total resistance can be calculated by summing all the individual resistances.

The resistance of the combustion gases can be calculated using the formula R = thickness / (conductivity * area), where the thickness is 2 mm, conductivity is 0.24, and area is 0.3 m². Similarly, the resistance of the soot layer and scale layer can be calculated using their respective thicknesses and conductivities.

Finally, the total heat resistance is the sum of the resistances of the combustion gases, soot layer, and scale layer. Calculating the values and summing them will give us the total heat resistance of the copper kettle system.