Heat exchanger with dry ice
Heat exchanger with dry ice
(OP)
I want to cool Natural gas from 293 Kelvin to 200 Kelvin in a heat exchanger by using dry ice as the collant. I have to determine the lenght of the heat exchanger but i dont know what the thermal conductivity value of the dry ice is and cant find it anywhere. I would be very glad if someone can help me..
I also have one more question. If i use instead of solid dry ice, an dry ice-glycol solution, would the heat transfer from the pipe to the solution by free convection or would it be conduction?
I also have one more question. If i use instead of solid dry ice, an dry ice-glycol solution, would the heat transfer from the pipe to the solution by free convection or would it be conduction?
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RE: Heat exchanger with dry ice
Does its conductivity matter? Your heat will convert it to carbon dioxide gas, and completely mess up the thermal contact with your heat exchanger. I should think that a cold liquid is a way better coolant.
What will keep your coolant cold, besides another heat exchanger?
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JHG
RE: Heat exchanger with dry ice
The big "but" - the dry ice sublimation point at 1 atm is just barely below 200K, and the freezing point of glycol mixtures is similarly just barely below 200K at a 60% by weight mix of ethylene glycol with water. I.e. it's gonna be tough to get to 200K in a heat exchange process with flowing gas, unless the gas flow line is very long. You will probably want something like a large insulated tank filled with dry ice/glycol mixture, with a coil (or a nested trio of coils) of gas flow tubing suspended in it.