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Heat flows trough a composite slab, as shown below. The depth of the slab is 1m. The k values are in W/mK. What is the overall resistance in K/W?
Heat flows trough a composite slab, as shown below. The depth of the slab is 1m. The k values are …
fluids

heat and mass transfer

Mech_59 Asked on 25th July 2023 in Mechanical engineering.
- 436 views
- 1 answers
- 0 votes
In a manufecturing process, a transparent film is bonded to a substrate as shown in given figure. Assuming the following conditions T∞ = 20 °C, h = 50 W/(m2K) and T1 = 30 °C, calculate the heat flux q0 that is required to maintain the bonded surface at T0 = 60° C.
In a manufecturing process, a transparent film is bonded to a substrate as shown in given figure. To cure the …
fluids

heat and mass transfer

Mech_59 Asked on 25th July 2023 in Mechanical engineering.
- 709 views
- 1 answers
- 0 votes
A laboratory furnace wall is constructed of 0.2 m thick fire clay bricks (k = 1.0 W/m K). The maximum allowable heat transfer rate through the wall of the furnace is 900 W/m2, determine how thick must the insulating layer be?
A laboratory furnace wall is constructed of 0.2 m thick fire clay bricks (k = 1.0 W/m K). The wall …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 490 views
- 1 answers
- 0 votes
A plane wall of a refrigerated van is made of 1.5mm steel sheet (k_s = 25W/(mK)) at the outer surface, 10 mm plywood (k_p = 0.05 W/(mK)) at the inner surface and 20 mm glass wool (k_G=0.01 W/(mK)) in between the outer and inner surfaces. Determine the individual components of the thermal resistance
A plane wall of a refrigerated van is made of 1.5mm steel sheet (k_s = 25W/(mK)) at the outer surface, …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 533 views
- 1 answers
- 0 votes
A hot 16cm x 16cm x 16cm cubical iron block is cooled at an average rate of 80 W. What is the heat flux?
A hot 16cm x 16cm x 16cm cubical iron block is cooled at an average rate of 80 W. What …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 565 views
- 1 answers
- 0 votes
A 1 kW electric resistance heater in a room is turned on and kept on for 50 minutes. What is the amount of energy transferred to the room by the heater?
A 1 kW electric resistance heater in a room is turned on and kept on for 50 minutes. What is …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 508 views
- 1 answers
- 0 votes
A 2kW electric resistance heater submerged in 30 kg water is turned on and kept on for 10 min. What is the temperature rise of water.
A 2kW electric resistance heater submerged in 30 kg water is turned on and kept on for 10 min. During …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 552 views
- 1 answers
- 0 votes
Eggs with a mass of 0.15 kg per egg and a specific heat of 3.32 kJ/kg.C are cooled from 32 degree Celsius to 10 degree Celsius at a rate of 300 eggs per minute. Compute the rate of heat removal from the eggs in kW.
Eggs with a mass of 0.15 kg per egg and a specific heat of 3.32 kJ/kg.C are cooled from 32 …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 544 views
- 1 answers
- 0 votes
After sunset, radiant energy can be sensed by a person standing near a brick wall. What would be the radiant heat flux per square meter from a brick wall at this temperature?
After sunset, radiant energy can be sensed by a person standing near a brick wall. Such walls frequently have a …
fluids

heat and mass transfer

Mech_59 Asked on 12th July 2023 in Mechanical engineering.
- 592 views
- 1 answers
- 0 votes
The average forced convective heat transfer coefficcient for a hot fluid flowing over a cold surface is 200 W/(m^2C). Determine the heat transfer rate per unit surface area from the fliuid to the surface.
The average forced convective heat transfer coefficcient for a hot fluid flowing over a cold surface is 200 W/(m^2C). The …
fluids

heat and mass transfer

Mech_59 Asked on 10th July 2023 in Mechanical engineering.
- 547 views
- 1 answers
- 0 votes

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