Add wind power density to the OEO

[madbkr]

Description of the issue

Wind power density (WPD) is a term used in the definitions of the tasks module (see #1891). As decided in the dev meeting there should be a separate issue to discuss the definition.
It was also discussed if this should be the subclass of areal power density.

Ideas of solution

I propose this definition:
wind power density (WPD) is a quantity vale of the power wind has in a specific area. It is calculated as 0.5 * air density * (wind speed to the power of 3)

Workflow checklist

• I discussed the issue with someone else than me before working on a solution
• [ x] I already read the latest version of the workflow for this repository
• [ x] The goal of this ontology is clear to me

I am aware that

• [ x] every entry in the ontology should have a definition
• [ x] classes should arise from concepts rather than from words

[tpelser]

This looks like a good definition.

[stap-m]

wind power density (WPD) is a quantity vale of the power wind has in a specific area. It is calculated as 0.5 * air density * (wind speed to the power of 3)

So, we are talking about wind (i.e. moving air) and not wind power plants. Is this correct for the task definition use case @tpelser?
If it refers to a specific area (which "density" and also the definition suggests, I'd expect it to be part of the calculation, i.e. 0.5 * air density * (wind speed to the power of 3) per squaremeter.
We should probably distinguish between wind power and wind power density.

[tpelser]

In this case, yes. The theoretical wind potential can include the wind power density of an area. In the technical potential there is a similar, but different term called the "capacity density" which refers to how many megawatts of wind power are installed in a square kilometer.

[madbkr]

It may also be useful to provide the unit that the WPD is supposed to be in. I assume it would be W/m²? At least this is what I found searching online. The formula I used for the definition is also the generic one I searched online.

But since this issue wants to use WPD as its own term I would assume we should stick to the generic use of the formula - even if in the task there may be something more specialized in use?

[tpelser]

Hi, yes I agree and the unit is correct (W/m^2). The formula is also correct for wind power density. Capacity density is something entirely different with a similar sounding name.