Hi All,
I am modeling a VRF system and I was curious to exactly what are the
units of the numbers that the curves are producing for Total Capacity
F(entering Wb, leaving db) and Elect Input Ratio(Entering Wb, Leaving DB)?
I graphed the curves in the spreadsheet (see attached) and I am not sure
what to label the numbers.
Thank you,
Lee
The inputs to this module appear more on the Quantum Physics line.
And I am a poor engineer..
John Aulbach
If you have trouble with doing this in eQuest, System Adviser model
is excellent- it is a TRNSYS model with very simple
inputs and nice data bases and output graphics.
Best regards-
*Jeremiah D. Crossett*
John,
Good to see your still around, old buddy.
If all you need to do is a quick calculation of production, try PV-Watts v.1 or 2. It's an online tool with a minimum of simple inputs. It can also export hourly production if you want to look at potential demand offset.
For performance contracts or a power purchase agreement, our PV engineers use PV-Syst, which requires more inputs and a bit of PV system design knowledge. They then apply a % to the annual production for conservatism so we don't have to write a check for any shortfalls in production.
My best,
Mike
Michael R. Busman, CEM
Another option is to use RETScreen.
Vikram Sami, LEED AP BD+C
If you want to do this in eQUEST, they have a default template in the library (ACME Sunsoaker). You could start off with that and modify if needed:
[cid:image002.jpg at 01CD69A4.22200810]
The PV Dialogue box looks like this. You could find the values to fill in from the manufacturers specs (like this one - see page 2). Its actually quite easy to do.
Vikram Sami, LEED AP BD+C
Vikram,
I'm getting forgetful in my old age. RETScreen is also very good and easy. On previous wind projects with historical wind data, RETScreen produced comparable results with HOMER, a custom hourly spreadsheet, and another software package I can't remember the name of right now.
Mike