Air is flowing through a smooth thin walled 4 indiameter copper tube that is submerged in water The water maintains a constant temperature of 60 deg F and a convection heat transfer coefficient of 176 Btu hft 2 R If air (1 atm) enters the copper tube at a mean temperature of 90 deg F with an averag...

Air is flowing through a smooth thinwalled copper tube that is submerged in water the necessary copp ...

Air is flowing through a smooth thin-walled 4-indiameter copper tube that is submerged in water. The water

Question:

Air is flowing through a smooth thin-walled 4-indiameter copper tube that is submerged in water. The water maintains a constant temperature of 60°F and a convection heat transfer coefficient of 176 Btu/hˆ™ft²ˆ™R. If air (1 atm) enters the copper tube at a mean temperature of 90°F with an average velocity of 8 ft/s, determine the necessary copper tube length so that the outlet mean temperature of the air is 70°F.

Water, ho. -Te Alr, h