Data for energy emission

[ChrisZenhub]

energy emission: "Wärmeabgabe", so technologies like floor heating, radiator, etc...

compile a list of technologies to consider for HIVE and acquire relevant data

• supply/return temperature
• cost per m² floor area
• embodied emissions
• any other data that is relevant for HIVE

[christophwaibel]

cost and embodied carbon emissions are missing in #363 , but should be ok for the september release