MEs: On Steam Tables...

Factual Questions
1

Maybe I’m missing something here, but how can I find the properties of subcooled water? I thought the steam tables would have this information, but from what I can find, the steam tables cover saturated liquid, the sat liquid-vapor phase, and superheated steam.

My problem is: I have liquid water with some known enthalpy at some known temp. But, I don’t know what pressure I am at. My company uses some steam table “library” function plugged into Excel. It found some pressure associated with those conditions, but I need to verify it on an ASME steam table…but I can’t find it!

My wager is that enthalpy (h) is found by Q=mcpdT? (And, h = Q) Since pressure never enters into the equation, any pressure could satisfy these conditions, right?

Any help would be greatly appreciated.
Thanks,
Jinx

2

There are compressed water tables. Several of my books have them, and most freeware steam tables (or the ASME steam tables) have all of their properties. They sometimes are omitted from collections of steam tables, but they do exist, and are useful if you want to be the most accurate you can be.

3

Yeah, of course…oops! I knew that! :open_mouth:

  • Jinx