Thermodynamics and Heat Power 8th. Edition by Irving Granet, PE Maurice Bluestein | 9781482238563 | 148223856X | Holooly

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}

= 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,

\theta_{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,

\theta_{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...

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