heat energy required to heat liquid flowing through pipe
heat energy required to heat liquid flowing through pipe
(OP)
I have to heat up some oil flowing through a 1" pipe. I need to know the equation (mind is hazy now).
I want to use an electrical resistance heater to heat the fluid. Fluid is oil, about 140W gear oil.
I just want to get into the ballpark to size the heater.
Need to raise the temp from ~0*C to ~40*C. Flow rate is about 3 gallons per day.
It's for the cylinder lube oil on a natural gas compressor. It's a high pressure application, so it requires very viscous lube oil for the cylinders, which means we have to keep it warm, because at freezing ambient temps it will not flow very well. So I'm thinking about some type of electrical resistance heater over the piping.
This is a repost from
http://www .eng-tips. com/viewth read.cfm?q id=227618& amp;page=1
Hoping that this forum is more appropriate.
Thanks
I want to use an electrical resistance heater to heat the fluid. Fluid is oil, about 140W gear oil.
I just want to get into the ballpark to size the heater.
Need to raise the temp from ~0*C to ~40*C. Flow rate is about 3 gallons per day.
It's for the cylinder lube oil on a natural gas compressor. It's a high pressure application, so it requires very viscous lube oil for the cylinders, which means we have to keep it warm, because at freezing ambient temps it will not flow very well. So I'm thinking about some type of electrical resistance heater over the piping.
This is a repost from
http://www
Hoping that this forum is more appropriate.
Thanks





RE: heat energy required to heat liquid flowing through pipe
Good luck,
Latexman
RE: heat energy required to heat liquid flowing through pipe
Q is the energy required to change the temperature
w is the flow rate
cp is the thermal capacitance of the oil
and ΔT is the change in temperature
Obviously, you need to make sure all your units are compatible.
The hard part may be coming up with the cp value for your lube oil. I don't have any good values for that weight oil. Your best bet may be going back to the oil distributor.
Patricia Lougheed
Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.
RE: heat energy required to heat liquid flowing through pipe
That's about what I had come up with, but was having a tough time finding the Cp for my oil... I'll dig some more.
W is the flow rate, in mass or volume flow rate?
Thanks
RE: heat energy required to heat liquid flowing through pipe
Patricia Lougheed
Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.
RE: heat energy required to heat liquid flowing through pipe
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: heat energy required to heat liquid flowing through pipe
Yea i'm not too worried about loses, I just to be in the ballpark, to see how much electricity I need to budget for.
Thanks again
RE: heat energy required to heat liquid flowing through pipe
A rough specific heat capacity of 1800 J/(kg.K) would be, as you say, in the ballpark.
RE: heat energy required to heat liquid flowing through pipe