Package for standard hydronic configurations

[AntoineGautier]

Note: The feature branch is issue1884_hydronics.

This is to develop a package where we collect different hydronic configurations for heating or cooling systems.

• For these it would also be nice to have CDL control sequence.
• The configurations either have a differential pressure or not at their supply, and have either no valve, a two-way or three-way valve, optionally with a bypass if the primary supply temperature is higher than the secondary heating design supply temperature (or cooler for cooling systems).
• These are the repetitive elements that can then be used in a variety of projects. As such, this is a shared task between OBC, URBANopt and Spawn.

See figure for some examples of such standard configurations.

[mwetter]

See also the classification in http://herzmediaserver.com/data/01_product_data/06_broschure/eng/hkls_anlagen_en.pdf