Equivalent water temperature in a parallel and series piping systems
Equivalent water temperature in a parallel and series piping systems
(OP)
My question is: How do you find the equivalent water temperature in a series or parallel system? Ex: you have 4 gpm of water @ 45 C splitting into two legs of which one 1gpm leg absorbs 2 kW of heat and the other 3 gpm leg absorb 1 kW. Whatis the equivalent temperature coming out of these two leags in parallel?? I am almost sure I know how to do this but I need to confirm and make sure I am not missing something.
Thanks in advance
Thanks in advance





RE: Equivalent water temperature in a parallel and series piping systems
Q = mdotCpΔT
I2I
RE: Equivalent water temperature in a parallel and series piping systems
Couple questions
1) Why are your temperature and heat flux in SI units and your flow rate in American standard?
2) Do the fluids ever join back together?
3) What do you mean by "equivalent temperature"?
Patricia Lougheed
Please see FAQ731-376 for tips on how to make the best use of the Eng-Tips Forums.
RE: Equivalent water temperature in a parallel and series piping systems
I, as Patricia also does, ask the same question about what you consider is equivalent temperature. There's a temperature of one gallon in one pipe and there's a temperature for a different gallon in another pipe. They only equalize if you mix them again, otherwise they're independent of one another.
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Equivalent water temperature in a parallel and series piping systems
David
RE: Equivalent water temperature in a parallel and series piping systems
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: Equivalent water temperature in a parallel and series piping systems
RE: Equivalent water temperature in a parallel and series piping systems
TTFN
RE: Equivalent water temperature in a parallel and series piping systems
Your statement is one of the reasons I asked about the mismatch in units. This sounds an awful lot like a homework problem.
Patricia Lougheed
Please see FAQ731-376 for tips on how to make the best use of the Eng-Tips Forums.
RE: Equivalent water temperature in a parallel and series piping systems
Doesn't it though. That equation has stuck with me longer than anything else and the numbers are too clean to be anything but a homework problem, hope he gets what he needs before this thread gets zapped.
David
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The harder I work, the luckier I seem
RE: Equivalent water temperature in a parallel and series piping systems
Diabolico, to estimate the final combined stream temperature you don't even need to calculate the increase in temperature of each stream as long as they mix again and you know the total heat transferred to both streams.
4 gpm = 899.4 kg/h @ 45oC
Cp = 0.997 kcal/(kg.oC)
3 kW = 2579.5 kcal/h
Δt = 2579.5÷(899.4×0.997) = 2.88oC