Hi guys this question is not from me but if i can get the
answer it will most definitely be helpful for me
and the friend that requires the answer , or hopefully
reference material would be great.

Here it is.


I am trying to get hold of some formulas for enthalpy and entropy. I already have some but I don't know what the letters mean. ie Q=? h1=?

I'm also trying to find a legend for reading electrical and mechanical schematics for refrigeration.

If anyone can help please let me know.

Thanks.