A 2-in. schedule 40 steel pipe (ID=2.067in., OD = 2.375 in.) carries steam at 350F with a heat-transfer coefficient of 50 Btu/h*ft^2*F. The pipe is exposed to air at 70F with a heat-transfer coefficient of 2.0 Btu/h*ft^2*F. For safety reasons, as well as to conserve energy, it is desired to insulate the pipe so that the temperature of the surface exposed to air will be no greater than 120F. A commercial insulation vendor claims that using just 0.5 in. of his “high-efficiency” insulation will do the job. Is his claim correct? Notes: 1. The vendor’s literature states that a 6-in. thick layer of “high-efficiency” insulation has an R-value of 23.7.2. The thermal resistance of the pipe wall may be neglected in this calculation. Also neglect contact resistance and thermal radiation effects

Question
  1. A 2-in. schedule 40 steel pipe (ID=2.067in., OD = 2.375 in.) carries steam at 350F with a heat-transfer coefficient of 50 Btu/h*ft^2*F. The pipe is exposed to air at 70F with a heat-transfer coefficient of 2.0 Btu/h*ft^2*F. For safety reasons, as well as to conserve energy, it is desired to insulate the pipe so that the temperature of the surface exposed to air will be no greater than 120F. A commercial insulation vendor claims that using just 0.5 in. of his “high-efficiency” insulation will do the job. Is his claim correct? Notes:

    1. The vendor’s literature states that a 6-in. thick layer of “high-efficiency” insulation has an R-value of 23.7.
    2. The thermal resistance of the pipe wall may be neglected in this calculation. Also neglect contact resistance and thermal radiation effects

Expert Answer

1 Rating

Want to see the step-by-step answer?

Check out a sample Q&A here.

Want to see this answer and more?

Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes!*

*Response times vary by subject and question complexity. Median response time is 34 minutes and may be longer for new subjects.

Related Chemical Engineering Q&A

Find answers to questions asked by student like you

Q: Fuels for motor vehicles other than gasoline are being eyed because they generate lower levels of po...

A: Combustion reaction of propane with air is written as:Note that in the question CO2 and CO are given...

Q: Determine the specific potential energy change that water undergoes when a mass of water is raised 4...

A: Specific potential energy is the potential energy of 1 unit mass of the object. Change in specific p...

Q: Ethylene oxide is formed by the partial oxidation of ethylene. Unfortunately some of the ethylene is...

A: Part (a) The schematic diagram of the given process is shown below.

Q: .Verizon 89% 5:33 PM Done 3. The inside of a soda can is at a pressure of 350 kPa (gauge pressure) a...

A: Part (a)First convert the given gauge pressure in absolute pressure in atm as: 

Q: Determine the kinetic energy in Btu/hr of 100 gallon/min of water flowing through a pipe with an ins...

A: The formula to calculate the kinetic energy of an object with constant mass in a rectilinear motion ...

Q: The figure below represents a simple flow sheet for a single unit. Only the value of D is known. Wha...

A: Click to see the answer

Q: 9.18. In a continuous-flow process, a gas is throttled to half its density. The throttling is well d...

A: Throttling process is defined as the process for which enthalpy remains constant that is no work is ...

Q: Please answer parts (d), (e), and (f).

A: Part (d)For the input, U(s) = 4/s, the output Y(s) is written as shown below.

Q: details in photo, please show all steps

A: Part (a):Michaelis-Menten approach is best known approach to enzyme kinetics. The given mechanism is...