I know this is very basic, but I'm feeling like I'm missing something.
Enthalpy as an example: I know that hf is enthalpy of saturated liquid, and hg is enthalpy of saturated vapor, and hfg = (hg - hf).
I was working some vapor cycle problems last week, and from the steam tables, I would select hg for saturated steam at the given temp/pressure. Instead of hg, the solution selected hfg. I wish I could remember which problem, but I don't even remember which book I was working in. I just continued working problems at the time, but now I'm thinking about it and feeling confused.
So, when would I select "fg" instead of "g" from the steam tables?
I just feel so overloaded and tired and frustrated now, and like I'll never pass. A week ago, I was feeling pretty confident. Ugh. Ok, must refocus...
Enthalpy as an example: I know that hf is enthalpy of saturated liquid, and hg is enthalpy of saturated vapor, and hfg = (hg - hf).
I was working some vapor cycle problems last week, and from the steam tables, I would select hg for saturated steam at the given temp/pressure. Instead of hg, the solution selected hfg. I wish I could remember which problem, but I don't even remember which book I was working in. I just continued working problems at the time, but now I'm thinking about it and feeling confused.
So, when would I select "fg" instead of "g" from the steam tables?
I just feel so overloaded and tired and frustrated now, and like I'll never pass. A week ago, I was feeling pretty confident. Ugh. Ok, must refocus...