jacksonlord

Thanks, I'm interested. How do I get the utility?

Are you still in need of testers?

I'm getting the error "Could not open one hierarchy member" frequently when I try to reopen WAsP projects. The reason is given that it "Failed to recover a file from the archive". This is often problematic since opening a saved project is the only way to recover a calculated wrg in case I want to do some energy captures or recalculate it to finer resolutions, rather than starting over.

Brilliant. I am traveling now but will let you know what I find...

I have been running WAsP resource grids for some time now, and I often find that the calculated energy production (and capacity factor) is being overestimated when using these wrg's in openWind, my optimization software. Sorry for the very general question, but why is this? I have been trying to bring down these numbers and have checked a few possible issues with input variables, like surface roughness and air densities, but I consistently find that the grids are overestimating production in multiple locations and scenarios by about 4 capacity factor percentage-points.

I was given RSF files along with the corresponding WRG files too, actually. Does this make it easier to transfer into something useful? OpenWind is usually able to open WRG's and then it can do energy capture calculations with them, and also export them to grids for mean speed, power densities, etc. But for some reason these WRG's I have are giving me some coordinate error when I try to import to OpenWind. I'm posting a question about this to Nick on his forum. So it's too bad that WAsP cannot open these files, or even convert them. I can write a script, perhaps. It looks like there was once a utility to convert rsf to grid, which I found on the WAsP utilities page, but I was unable to run the program because I didn't have a password.

Then how about a way to simply convert a wrg or rsf to a raster file like a surfer grid? Right now I have some wrg's and rsf's from our partners and I have no way of opening them or even converting them using WAsP....

Yes, saving a fully-calculated wrg then re-opening it later, with all the calculations and settings intact.

Can it be done?

Thanks for the tip. It is a particularly large grid. I was hoping to use it in openWind. I decreased the cell size and ran it successfully. Then I successively decreased the cell size by half and re-ran the model until the resolution was satisfactory.

Is there any way to show the diurnal distribution of data (or by month, for that matter) in the Climate Analyst?

I'm trying to run the calculation on a very large resource grid (950,000 nodes) using a pretty detailed contour vector map. When I click calculate, it says that it cannot do the calculation, and that the system reported that: "Overflow". What is this error?

WAsP Team, I have some dates and times that are missing in my data file and are not given "nulls" or placeholder values. They are simply missing so that the entire row for each missing time step will be skipped. Looks like the climate analyst takes whatever the last time step's value was and extends it until the next time. Is there a way to remove missing time steps entirely or make them null? thanks, Jackson

Duncan- thanks for the response. I see now the logic of this method. I was beginning to realize that this weekend as I examined the atlas again and put two-and-two together. My key misunderstanding, I think, was the nature of the effects on sheer from surface roughness, rather than as a retardation of the wind flow on the entire vertical profile. Also, I see now that the roughness rose has to be placed both as a child to the met tower and the turbine sites (for a homogeneous site, that is). Only placing a rose under the met tower, for example, would imply that the flow at the turbine site is less inhibited, thus more productive given the same wind resource. That also explains the AEP numbers I reported, as you said. I'm now getting the rose and change line derived values to converge as well. Thanks for the tips, jackson

The height of my met station is 58 m, and the turbines are at 80 m hub height. I figured there would be some generic sheer exponent applied? There is a single roughness change line which encircles the entire project area and assigns Zo=0.3 both inside and out. It is about 10-20 km from the site.