heat object with fluid
heat object with fluid
(OP)
hi,
how would i calculate heating up an object with oil?
the temperature of the oil is 100 degrees
the object mass is 48.40kg
temp to reach 100 degrees
starting temp of object is 50 degrees
oil is going through object so full contact
how would i calculate heating up an object with oil?
the temperature of the oil is 100 degrees
the object mass is 48.40kg
temp to reach 100 degrees
starting temp of object is 50 degrees
oil is going through object so full contact
RE: heat object with fluid
Ignoring all of that; temperature rise is asymptotic to oil temperature, so near infinite time to reach.
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RE: heat object with fluid
volume of object is 361mm*361mm*50mm =0.00651605m3
density of material is 7850 kgs/m3
specific heat of material is 0.49kj/kg
i dont know whats the thermal conductivity
RE: heat object with fluid
RE: heat object with fluid
and also the the oil is travelling within the metal block
RE: heat object with fluid
lumped capacitance method
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RE: heat object with fluid
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: heat object with fluid
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: heat object with fluid
the oil im using is shell heat transfer oil s2
the data for it is here:
http://www.rxl-sz.com/e/products/heat_transfer_flu...
the metal im using is carbon steel and they say thermal conductivity is around 45 watts per kelvin per meter
and thank you for helping
RE: heat object with fluid
TTFN (ta ta for now)
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RE: heat object with fluid
This is a transient simulation and hence is ill suited to a calculation, though the paper linked to by IR stuff has a good try.
However depending on how accurate you need to be you can work on some assumptions.
The metal will need a certain amount of heat energy to go from 50 to 100C
This heat energy is supplied by the oil, but at an unknown rate.
What do you mean by "full contact?"
Your unknowns:
How much heat is lost by the outside of your block to air / other losses. Again a temperature dependant thing as the hotter it gets the greater the losses.
Unless this block is heavily insulated
Heat transfer rate and oil flow. You say nothing about oil flow rate. It has be be big enough that it's exit temperature is close to the inlet temperature for simple calculations to work.
So work or estimate some of those and you might get close.
As said if the oil temp is 100 and your target temp is a 100 you will get to 97 or98 but to get to 100 will take a loooooong time. Maybe better to have at least 10C difference between oil temp and desired block temperature
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: heat object with fluid
So, yes, if there's ANY loss of heat to the ambient or elsewhere, you will never reach 100C everywhere in your "object"
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RE: heat object with fluid
RE: heat object with fluid
for this experiment we will be calculating with no loss
and depending on the temperature of the oil it can flow around 49-47 L/min
its acts as radiator as you say fluid goes in circulates around and then goes out however its a solid block not just tubing and fins
if the oil flowing at 110 degrees ( we dont count the time for oil to heat up to temp) and is flowing in the metal block can we not use temp of oil and just the mass of the object to work out time to heat up or can we not do this as its a fluid heat up a solid and not a solid heating up another solid?
thank you for everyone help i appreciate it :)
RE: heat object with fluid
TTFN (ta ta for now)
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RE: heat object with fluid
Qin= M*Cp*dT/Dt; Qin (but/hr),M (lbm of block), Cp (Btu/(Lbm-dF),dT/dt (rate of rise the object temperature in degrees F/time element be it sec,min,hr)
All units are in the English system and it's up to you to convert into the Metric units. The equation that I presented is emendable to a spread sheet. You could also use integration for a solution. I would use both as a mean to determine accuracy.
RE: heat object with fluid