Search ...
Results
Subscribe
Step-by-Step Solutions
University Majors
Support Hub
Legal & Support Articles
Contact Us
Login
Share
Search ...
Results
Subscribe
Step-by-Step Solutions
University Majors
Support Hub
Legal & Support Articles
Contact Us
Login
Share
Heat Transfer
,
Thermodynamics
Thermodynamics and Heat Power
251 SOLVED PROBLEMS
Question: 11.21
A bare steel pipe of outside diameter 3.50 in. runs through a room whose walls are at 70°F. Determine the heat loss by radiation from 5 ft. of the pipe if its outside temperature is 120°F. ...
Verified Answer:
From Table 11.4, case 2,
F
A
F_{A}
F
A
= 1, ...
Question: 11.30
To increase the heat transfer rate from the box in Illustrative Problem 11.17, a vertical fin is added to each of the four sides (see Figure 11.36). The fins are aluminum, 15 cm high and 0.15 cm thick, and protrude 3 cm from the box. Find the new heat loss rate. ...
Verified Answer:
The fins are vertical plates with the same charact...
Question: 11.29
A heat exchanger has one shell pass and two tube passes similar to Figure 11.27c. Oil flows in the tube side and is cooled from 280°F to 140°F. On the shell side, water is heated from 85°F to 115°F. Determine the true mean temperature difference. ...
Verified Answer:
In order to use Figure 11.32, which is applicable ...
Question: 11.28
Using Table 11.6 for the appropriate fouling factors, calculate the surface required for Illustrative Problem 11.27. ...
Verified Answer:
For the oil side, a resistance (fouling factor) of...
Question: 11.27
If the best exchanger in Illustrative Problem 11.26 is operated in parallel flow, determine the outside tube surface required. ...
Verified Answer:
From Figure 11.31,
θ
A
\theta_{A}
θ
A
= 215 ...
Question: 11.26
A counterflow heat exchanger is used to cool a flow of 400 lb./min of lubricating oil. Hot oil enters at 215°F and leaves at 125°F. The specific heat of the oil is 0.85 Btu/lb.·°F, and the overall coefficient of heat transfer of the unit ...
Verified Answer:
From Figure 11.30,
θ
A
\theta_{A}
θ
A
= 215...
Question: 11.25
A steel pipe, k = 26 Btu/(h·ft.·°F), having an outside diameter of 3.5 in. and an inside diameter of 3.00 in., and 5 ft. long, is covered with 1 in. of mineral wool, k = 0.026 Btu/ (h·ft.·°F). ...
Verified Answer:
Because the same amount of heat traverses each of ...
Question: 11.24
Determine the overall heat-transfer coefficient for the composite wall of Illustrative Problem 11.4 if h on the hot side is 0.9 Btu/(h·ft .^2·°F) and h on the cold side is 1.5 Btu/(h·ft .^2·°F). ...
Verified Answer:
For a plane wall, the areas are all the same, and ...
Question: 11.23
Solve Illustrative Problem 11.16 taking into account both convection and radiation. ...
Verified Answer:
Because the conditions of Illustrative Problem 11....
Question: 11.22
Determine the radiation heat-transfer coefficient for the pipe of Illustrative Problem 11.21. ...
Verified Answer:
The upper temperature is given as 120°F and the te...
Loading...
Load More Questions