From: "Craig" <[email protected]> > Sent: Tuesday, July 23, 2013 1:08:24 PM > On 07/23/2013 03:52 PM, Alan Fletcher wrote: > >> See my Steam Calculator at http://tinyurl.com/def-1240 > > I added the reported input temperature (ambient isn't used) > > COP -- Water : 3.8 Steam: 13.8 > > > > > Can you publish the calculations you use for water and for steam?
All of the fields are in the calculator. The flow rate is in liters/minute, so I set the time period to 1 minute. For the enthalpy calculations I used a javascript library by Leon Kos -- see link at the bottom. I use these calculations in three zones : water from input to boiling, steam quality horizontal from 0 to 1, then saturated (dry) steam above that. I presumed a typical atmospheric pressure at the point where the output temperature is measured. But there MAY be back pressure up the hose. It's all in javascript, so you can see the code. (I prefer to keep my sloppy coding habits in PHP, where nobody can see them!) They don't cover the region at the peak of the curve, which is why it's a bit jagged there. (But you won't ever get there except in the core of a run-away nuclear reactor) In any event, calculating the COP as if it were water is a MAJOR under-estimate.
