- #1
Ronin2004
- 18
- 0
I have a quick question that maybe someone can help me out with. Let’s say I have an object that has a heat output of 48.7 KJ that is constant and it is surround by hydrogen that it flowing around it. Like a rock in a stream. If I know the starting temp of the hydrogen how would I determine how much heat is transferred from the object to the surroundings. What I wanted to do is use hydrogen as a heat exchange. I think this is forced convection but haven’t covered heat transfer in school yet. Would using forced heat convection equations help me determine the heat of the hydrogen after passing the object? Is this a heat transfer and fluids problem?
Basically I wanted to crunch the numbers on a sterling engine that used hydrogen as the working fluid and is heated from the waste heat of another process. I tried just using the Q=ncp(Th-Tc) but with I get huge numbers for the new temp and so I don’t think I am doing this right
If we take q=48700 J Tc=293K n=1 mole cp=28.834 J mol-1 K-1
Th=1981.98 K which seems to be a huge number
So I am looking for some help in how to model this to be somewhat realistic. I know the velocity of the hydrogen as it passes the heat source is important but I don’t know that and I think it would change with time and temp. If anyone can give me a direction into where I need to look to model this that would be awesome.
This is not homework it just spare time ideas
Basically I wanted to crunch the numbers on a sterling engine that used hydrogen as the working fluid and is heated from the waste heat of another process. I tried just using the Q=ncp(Th-Tc) but with I get huge numbers for the new temp and so I don’t think I am doing this right
If we take q=48700 J Tc=293K n=1 mole cp=28.834 J mol-1 K-1
Th=1981.98 K which seems to be a huge number
So I am looking for some help in how to model this to be somewhat realistic. I know the velocity of the hydrogen as it passes the heat source is important but I don’t know that and I think it would change with time and temp. If anyone can give me a direction into where I need to look to model this that would be awesome.
This is not homework it just spare time ideas