Engineering, 13.12.2019 22:31 brae0

Airflow through a long, 0.25-m-square air conditioning duct maintains the outer duct surface temperature at 10°c. if the horizontal duct is uninsulated and exposed to air at 35°c in the crawlspace beneath a home, what is the heat gain per unit length of the duct? evaluate the properties of air at 300 k. for the sides of the duct, use the more accurate churchill and chu correlations for laminar flow on vertical plates.

a. what is the rayleigh number for free convection on the outer sides of the duct? b. what is the free convection heat transfer coefficient on the outer sides of the duct, in w/m2·k? c. what is the rayleigh number for free convection on the top of the duct? d. what is the free convection heat transfer coefficient on the top of the duct, in w/m2·k? e. what is the free convection heat transfer coefficient on the bottom of the duct, in w/m2·k? f. what is the total heat gain to the duct per unit length, in w/m?

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 12:10

On a average work day more than work place firs are reorted

Answers: 1

Answer

Engineering, 04.07.2019 18:20

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above

Answers: 1

Answer

Engineering, 06.07.2019 02:30

Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers

Answers: 3

Answer

Engineering, 06.07.2019 02:30

A12 mm diameter shaft runs in a plain cylindrical bush 30 mm long that is located in an 18 mm diameter hole in a housing. the shaft-inner bush fit is h8 f and the outer bush-housing fit is h7-p6. make a fully cimensioned sketch of the bush with tolerances. find the maximum and minimum clearance or interference for both fits on the inner and outer diameters of the bush

Answers: 3

Answer

You know the right answer?

Airflow through a long, 0.25-m-square air conditioning duct maintains the outer duct surface tempera...

Questions