×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Heat transfer coefficient for super heated steam2

## Heat transfer coefficient for super heated steam

(OP)
I am proposing to switch from saturated to superheated steam for a long distance steam transport system. Can any one let me know where I can find the Heat transfer coefficient (W/m^2K) for both saturated and superheated steam to calculate the heat loss in both cases. Transmission pressure is 9700 kpa, thanks

### RE: Heat transfer coefficient for super heated steam

The heat transfer coefficient for the superheated steam will depend on velocity. I would use the heat transfer coefficient for the condensing steam a value of 2000 Btu/ft2-h-F.

### RE: Heat transfer coefficient for super heated steam

(OP)
I understand heat transfer coefficient for saturated steam will depend on temperature also. In case of Super heated steam it will further depend on the degree of super heat. Heat transfer coefficient in case of Superheated steam is way lower than (condensing) saturated steam, generally in order of magnitude.
Is 2000Btu/ft2-h-F corresponding to 9700 kpa?
If not can I find a chart or a tool which will provide me the heat transfer coefficient for both saturated and super heated steam at various pressures and temperatures, Thanks!

### RE: Heat transfer coefficient for super heated steam

(OP)
Sorry, saw a typo above. Please read ".. heat transfer coefficient for saturated steam will depend on pressure also..."

### RE: Heat transfer coefficient for super heated steam

Do you have a copy of DQ Kern's Process Heat Transfer or Perry's Chem Engg Handbook or any other heat transfer text ? All information required to derive these coefficents for the operating press / temp ranges of interest may be found in these books. Also add a suitable fouling coeff if applicable.

### RE: Heat transfer coefficient for super heated steam

There are many sources for correlations for heat transfer coefficient, but it is irrelevant if you add insulation to the pipe for most practical sizes of pipe. The net heat transfer will be a function of the sum of the thermal resistances of the inside convective , pipe wall, outer insulation, and outer surface convective + radiation. The value of the insulation resistance overwhelms and makes irrelevant the other resistances.

"...when logic, and proportion, have fallen, sloppy dead..." Grace Slick

### RE: Heat transfer coefficient for super heated steam

@davefitze, Agreed, steam side htc (whether this be condensing or single phase forced convection ) is somewhat negligible in terms of heat transfer resistance in comparison to that presented by insulation layer and external insulation jacket radiation. This should simplify the calcs considerably with little loss in accuracy on total heat loss/ linear m of pipe.

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!