Is there a specific field for studying energy transport and conversion?

[cytochrome]

I know there are many types of energy and different fields study different types, but is there a field that broadly studies energy transport and conversion? Or a field that studies what energy is at a fundamental level and how it flows? I would think it's under the area of statistical mechanics or something like that, but can someone give me a more specific name?

I realize that this is an insanely broad question but I was just wondering.

 

[jerromyjon]

Thermodynamics?

 

[cytochrome]

I meant, is there a field of current research on this topic?