5 replies to this topic

[Engineer87]

Hi,

I'm totally new in heat loss calculations.I want to calculate the time required by the oil flowing in the insulated pipeline to get cooled down to 0C.

Ambient temp is -40C
Process temp is 5C
Fluid is Oil
Insulation is mineral Wool
Thickness is 1.5inch
Wind speed is 5mph
Pipeline size is 6inch


I calculated the heat loss but still need to calculate time required by my fluid to cool down to OC.

[breizh]

Engineer 87 ,

Please don't duplicate the posts .

Go to the search engine in this forum and key in : Pipe insulation heat loss , you will find information to answer your query . You should also consider to supply more info about your process fluid ( flow rate, temperature , viscosity , density , calorific capacity ,..).

 

Good luck.

 

Breizh

[Engineer87]

Thanks Breizh,

 

Here is some more info.I did not get any post showing answer to my specific concern

 

 

Flow rate =7264bb/d

viscosity=5.6cp

Density=54lb/ft3

Temperature=5c

Edited by Engineer87, 07 August 2015 - 03:03 AM.

[breizh]

Hi ,

Also missing the length of the pipe .

 

I've attached a copy of a  work done by Stephen Hall .

Good luck

 

Breizh

Edited by breizh, 07 August 2015 - 03:27 AM.

[Engineer87]

Thanks Breizh,

 

My pipeline length is 100m.I have used this sheet but it does not tell me anything about time required to cool my liquid down or am i missing somethin?

[breizh]

Hi ,

With the data supplied and other missing ( specific heat; thermal conductivity ) , your fluid will stay around 4.9 C at the outlet . The temperature will drop below zero  if you drop significantly  the flow rate  . If this is possible , you will need to consider tracing your line .

 

Hope this helps

 

Breizh