×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*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.

Students Click Here

Jobs

Sizing of Heater

Sizing of Heater

Sizing of Heater

(OP)
Hi,
Can anybody explain me how to size a space heater in a package unit.

I have the following info.

Cabinet Size (LXWXH):4.5 X1 X 2.6 m
Hydraulic Diameter : 1.63636 m
Air density at 10deg C : 1.3375 kg/m3
Air Velocity : 55 m/s
Dynamic Viscosity : 1.68E-05 kg.m/s
Reynolds Number : 7.17E+06
Specific Heat of air : 1.01E+03 J/Kg.K
Thermal Conducivity of air : 2.34E-02 W/m.K
Thickness of plate all side : 0.003 m
Insulation Thickness : 0.025 mm
Thermal conductivity of Insulation : 0.038 W/m.K
Temperature Inside Cabinet : 30 Deg C
Temperature Outside Cabinet : -9Deg C

From the above date,How can I calculate

a) Gross Heat Loss
b) Nusselt Number
c) Heater Size in Watts

Please correct me if there is any unrelavant info / if info is wrong.Please help me to find the size of heater.

RE: Sizing of Heater

(OP)
Addition to the above data,

Please consider

Outside plate is of SS-316 with thermail conductivity of 16.27 W/m.K

RE: Sizing of Heater

In order to solve the problem, you'll need some temperatures.

Sounds like a homework problem........

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.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources