Niels Gylling Mortensen

Hi Andrés, You can also explore the wind profile at a site by using scripts in WAsP: Insert a turbine site, select it, and then choose Tools > Utility scripts > ... to see what scripts are readily available. This way of doing it is described further in these course notes. Hope this helps, Niels

The Map Editor can use different grid formats to make WAsP maps. Look in the File > Import menu of the software and the help file. I personally use Surfer to make maps for WAsP, but the Map Editor can do more than most think. Hope this helps, Niels

Hi Inés, The Climate Analyst is not trying to recreate 2013 for you; it's a simple case of the software not 'lifting the pen' when drawing the entire time trace. If you have a look at the Generation report for the OWC, you can see that the 2013 data were not included. Hope this helps, Niels

Hi vob, There is no such thing as a stupid question ;-) I agree that the WAsP help file describes the default 12-sector setup only when it comes to RSF/WRG files. This is not a limitation of the software. The limitation is 36 10-degree sectors in the OWC and therefore also in the results. WAsP 12 will happily export 36-sector resource grids to RSF files. Thanks for your question; we'll update the help file accordingly in the next version. Best regards, Niels

Hi Jenny, I have WAsP 12.5.8 installed too and I can open and view the Palette Gallery by navigating to Tools > Options > Resource grids > ... The default palette files seem to be installed in C:\Program Files (x86)\WAsP\Samples\PaletteFiles.zip, but the software still points to "...\Documents\WAsP samples\Palette files" and can import files from here. The help file seems not to be updated on this point, sorry. Finally, I have no problems synchronizing to Google Earth Pro 7.3.3.7786, which is the version I use. Seems to me your WAsP installation is somehow not in order; have you tried to reinstall the software? Best regards, Niels

Dear CA1, I totally agree, but unfortunately we still have not implemented anything like this in WAsP for Windows. You can get some information from, say, the Global Wind Atlas 3 which can show typical yearly, monthly and daily variations of the wind resource. Best regards, Niels

Dear Pedro, No, only if you specify an obstacle member of the hierarchy. The mast itself will provide some flow distortion and 'shelter', but that is not treated at all by the obstacle model. However, you can insert User corrections in the hierarchy, if you have information about such effects.

Dear user, I have not heard of any references to this. I use the Map Editor myself on a regular basis and have not experienced any conflicts so far. If we hear of such conflicts we will of course try to solve them, but it is hard to guarantee that there could not (ever) be any conflicts. - Our general recommendation with WAsP software is to use the latest published version on our web site, unless you want to replicate an old project exactly. Hope this helps, Niels

Dear Irving, From version 12.3, WAsP will calculate a wake-reduced mean wind speed for every turbine site. I have not used this feature myself yet, but you might find it useful for your project when evaluating the influence of the turbines on the mast. The wake losses from different turbines, with different power/thrust curves and different hub heights (HH) can be modeled in WAsP. Hope this helps, Niels

Dear Pedro, I have not heard of similar studies and have not done any such studies myself. With the climatological nature of WAsP, we usually recommend to try tweak the average heat fluxes over land and water (WAsP 12 > GWC window > Profile model tab). This can work quite well, see e.g. https://orbit.dtu.dk/en/publications/wind-atlas-for-south-africa-wasa-observational-wind-atlas-for-10--4. Best regards, Niels PS. Adjusting for stability is after you have done all other adjustments, checked the maps, checked for obstacles, etc.

Dear Vinh Le Thanh, You are right: the roughness map is important in this case, so I will try to give you a few more hints: 1. The size (radius) of the map should be = 100 times your mast height and then some. So, for an 80 m mast, the radius should be, say, 8000 m + 50% = 12 km. The total map is then approx. 25 km by 25 km with the mast in the centre. 2. The most important roughness change is the coastline, i.e. from water (z_0 = 0 m) to land. If you download and use an SRTM elevation map in the Map Editor, this comes with the coastline already. 3. You need to generalise the land cover (roughness map) in order for the work to be practical. So, there is maybe not so many land cover classes (e.g. from south to north): the sea, marsh areas along the coast, farmland with few houses, farmland with many houses. For wind directions where a lot of the wind comes from, you can try to detail the land cover description and see if it changes the results. But you cannot specify each and every house, of course, but may specify an area of houses along a road. 4. How to digitise is described in this report http://orbit.dtu.dk/en/publications/wind-resource-assessment-using-the-wasp-software-dtu-wind-energy-e0135(259e26f3-1828-4e3f-9c37-17de375cd057).html Hope this helps, Niels

Dear Map Editor user, If you could share the area you are trying to download, I would be happy to try and reproduce the error. You can send the information to waspsupport@dtu.dk or nimo@dtu.dk. Best regards, Niels WAsP Support

Dear Seenu, Unfortunately, there is no "site (url) that identifies the level of error or deviation at each stage of WAsP’s calculation". There are some results reported in the literature, e.g. the CREYAP exercises and elsewhere; and the entire uncertainty question is the focus if an IEC working group at the moment. Best regards, Niels

Dear Seenu, I cannot help you with this question, but would have to refer you to the open literature. WindEurope made a series of test some years back that investigated uncertainties in power curves and wind farm modelling (Google 'CREYAP exercises'). Hope this helps... Best regards, Niels

Dear Seenu, We have addressed this problem in WAsP 12, which is able to estimate the air density at any turbine height (anywhere on planet earth) and extrapolate the power curve data to this air density. Before WAsP 12, we would have to do this calculation manually or ask the manufacturer of the turbine for data at the given air density. Best regards, Niels