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Heat-transfer Questions Set 18:

Quiz Mode

The shape factor for a plane wall is equal to:

A/δ

2A/δ

3A/δ

4A/δ

Solution:

What is the solar absorptivity of white marble?

0.48

0.47

0.45

0.46

Solution:

Which of the heat transfer methods involves the appreciable motion of molecules?

Radiation

Conduction

Convection

Plasma

Solution:

Which type of heat exchanger has the highest overall heat transfer coefficient?

Alcohol condensers

Steam condensers

Ammonia condensers

Feed water heaters

Solution:

If the Reynolds number and the Prandtl number are given, which other parameter will be required to find the Stanton number?

Characteristic number

Nusselt number

Peclet number

Conductive number

Solution:

An increase in fin effectiveness is caused by a high value of

Circumference and convective coefficient

Thermal conductivity and circumference

Thermal conductivity and area

Circumference and area

Solution:

A radiator in a domestic heating system operates at a surface temperature of 60 degrees Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body.

697.2 W/m²

786.9 W/m²

324.7 W/m²

592.1 W/m²

Solution:

The annealing furnace for continuous bar stock is open at the ends and has interior dimensions of 0.6 m x 0.6 m x 1.5 m long with a wall 0.3 m thick all around. Calculate the shape factor for the furnace.

15.24 m

16.34 m

14.54 m

13.76 m

Solution:

A furnace is made of a white brick wall with a thickness of 0.6 m and a thermal conductivity of 0.8 W/m⋅K. To achieve the same heat loss and temperature drop, the brick wall can be replaced by a layer of diatomite metal with a thermal conductivity of 0.15 W/m⋅K. What will be the replacement thickness?

0.212 m

0.112 m

0.312 m

0.412 m

Heat-transfer Questions Set 18:

The shape factor for a plane wall is equal to:

Solution:

What is the solar absorptivity of white marble?

Solution:

Which of the heat transfer methods involves the appreciable motion of molecules?

Solution:

Which type of heat exchanger has the highest overall heat transfer coefficient?

Solution:

If the Reynolds number and the Prandtl number are given, which other parameter will be required to find the Stanton number?

Solution:

An increase in fin effectiveness is caused by a high value of

Solution:

A radiator in a domestic heating system operates at a surface temperature of 60 degrees Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body.

Solution:

The annealing furnace for continuous bar stock is open at the ends and has interior dimensions of 0.6 m x 0.6 m x 1.5 m long with a wall 0.3 m thick all around. Calculate the shape factor for the furnace.

Solution:

Solution:

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