GET RID OF LOW GRADE HEAT

[paduk]

Hi guys,
I am looking for some ideas as a way of taking low-grade heat out of water.
Must be artistic (the kind of stirling engines ...).
Does anybody got any ides?
Thank you

 

[civilperson]

What is "low grade heat"? Do you mean to lower the average temperature of the liquid or convert the liquid to solid or what? Why not impose a vacuum on the surface of the water?

 

[bimr]

Pump the water up through a cooling tower and let it return by gravity.

That is what most of the power plants are doing to get rid of excess heat, particularly if you are talking about a lagoon.