A cast-iron pipe of 0.11 m outer diameter (O.D.) and 0.10 m inner diameter (I.D.) carries...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A cast-iron pipe of 0.11 m outer diameter (O.D.) and 0.10 m inner diameter (I.D.) carries steam at 200 °C. It is to be insulated with a 0.025 m thickness on an insulating material having Kkm = 0.035 W/m K. The ambient temperature is 0 °C and the outer and inner heat transfer coefficients are, respectively, 72 and 225 W/m². K. Thermal conductivity of cast-iron pipe is equal to 46 W/m. K. a) (15 pts.) Please compare the heat flux per unit length when the insulating material is placed on the inner surface and/or is placed on the outer surface. Why we observe such behavior? b) (15 pts.) What thickness of insulation, when placed on the outer surface, gives the same heat flux through the wall as a 0.025 m thickness placed on the inner wall? A cast-iron pipe of 0.11 m outer diameter (O.D.) and 0.10 m inner diameter (I.D.) carries steam at 200 °C. It is to be insulated with a 0.025 m thickness on an insulating material having Kkm = 0.035 W/m K. The ambient temperature is 0 °C and the outer and inner heat transfer coefficients are, respectively, 72 and 225 W/m². K. Thermal conductivity of cast-iron pipe is equal to 46 W/m. K. a) (15 pts.) Please compare the heat flux per unit length when the insulating material is placed on the inner surface and/or is placed on the outer surface. Why we observe such behavior? b) (15 pts.) What thickness of insulation, when placed on the outer surface, gives the same heat flux through the wall as a 0.025 m thickness placed on the inner wall?
Expert Answer:
Answer rating: 100% (QA)
SOLUTION To compare the heat flux per unit length when the insulating material is placed on the inner surface and when it is placed on the outer surface we need to calculate the heat transfer rate for ... View the full answer
Related Book For
Posted Date:
Students also viewed these accounting questions
-
Company Audi's capital structure includes Equity, Preference shares and Bonds (Debt). It wants to calculate its WACC (Weighted average cost of capital) Capital Structure: The market value of Audi's...
-
A wall 2 cm thick is to be constructed from material that has an average thermal conductivity of 1.3 W/m C. The wall is to be insulated with material having an average thermal conductivity of 0.35...
-
5. In a particular year, XYZ pension fund earned a return of 15 percent by making the following real estate investments in the following risky assets: Apartments Industrial Office Retail Apartments...
-
Maggie, Bihun, and Mee decided to go into the landscaping business. The three orally declared that they would be partners in PPL Landscapers, sharing profits and losses equally. Maggie, Bihun, Mee...
-
Use the Repository Reports feature to produce the following reports and matrices, either by printing the reports or by previewing them using your Web browser. The selection criteria from the...
-
Explain how driver tracing works.
-
Briefly describe the balance sheet approach in accounting for income taxes.
-
Regina Company manufacturers a professional- grade vacuum cleaner and began operations in 2014. For 2014, Regina budgeted to produce and sell 20,000 units. The company had no price, spending, or...
-
pls help me according to the options I posted On April 1, 2024, Wildhorse Company purchased 37,600 common shares in Ecotown Ltd. for \( \$ 17 \) per share. Management has designated the investment as...
-
Consider the unadjusted trial balance of Burrows Landscaping at December 31, 2017, and the related month-end adjustment data: The following adjustments need to be made before the financial statements...
-
Primare Corporation has provided the following data concerning last month's manufacturing operations. Purchases of raw materials $ 32,000 Indirect materials used in production $ 4,520 Direct labor $...
-
Describe in detail the importance of the new information that is being applied in South African schools, using the SA-SAMS. How does Amazon's Flywheel strategy fits with its evolving vision...
-
1- Derive the following result for the pitching moment taken about the leading edge of a thin supersonic airfoil (+) where Cm = 4 M2-1 C yc Vc = 1/ yed: ycdx 2 0
-
Simplify: (36-4).5 The solution is I
-
It is given = ++ k, v = - -k and w = k. 2 (a) Show , v and w are mutually perpendicular to each other. (b) rr It is assumed that the unit vector, = pu + qv+rw. By applying dot product between and u,...
-
Consider the following expression: fraction numerator open vertical bar x close vertical bar over denominator x squared end fraction What is the value of this expression when x = - 5 ?
-
The following information is available for DVC Corporation for the current month: Started this month 120 000 Units Beginning WIP (3/5 incomplete) 11 250 Units Total spoilage 3 000 Units Abnormal...
-
Distinguish between the work performed by public accountants and the work performed by accountants in commerce and industry and in not-for-profit organisations.
-
A hot steam pipe at 200oC having a surface emissivity of 0.7 and diameter of 10 cm is placed horizontally in a room of quiescent air at 1 atm and 300 K. Calculate the total heat lost by the pipe per...
-
Using the slug-flow model, show that the boundary-layer energy equation reduces to the same form as the transient-conduction equation for the semi-infinite solid of Section 4-3. Solve this equation...
-
A 50-cm-diameter pipeline in the Arctic carries hot oil at 30C and is exposed to a surrounding temperature of 20C.Aspecial powder insulation 5 cm thick surrounds the pipe and has a thermal...
-
Question: Marvin asks Sheila, a qualified auto mechanic, to fix his engine, which constantly stalls (stops) while driving. When Marvin returns, Sheila informs him that the engine is now "Perfect-runs...
-
2. Joya is the head of the personal insurance division of a large insurance company. Six months before, she was almost promoted to vice-president, but she lost out to Bill, a colleague from another...
-
4. Mark is an executive for a multinational office equipment company that would like to enter the potentially vast Chinese market. The official tariffs on office equipment imported into China are so...
Study smarter with the SolutionInn App