Define sub-categories for generic heat pump models

[ttjaden]

By now, the generic version of each heat pump type (air/water, water/water, brine/water) represents an average model, beacause their parameters are the average of all available heat pump models.

For practical research question,

• 3 generic sub-categories should be created
• or a function the create the generic model on the user side.

The idea for the sub-categories could be:

• low efficiency (parameters for 20% of the worst real heat pump models)
• average effciency (parameters for the real heat pump models between low and high efficiency)
• high efficiency (parameters for 20% of the best real heat pump models)

[xihaui]

There are 3 Generics for Group 1 and Group 5.
Generic_top - scop of top 20%
Generic_average - scop middle 60%
Generic_bottom - scop of worst 20%

They need to be validated.