Thermal use of the underground - Ground source heat pump systems.
STANDARD published on 1.9.2001
Designation standards: VDI 4640Blatt2
Note: WITHDRAWN
Publication date standards: 1.9.2001
The number of pages: 43
Approximate weight : 129 g (0.28 lbs)
Country: German technical standard
Category: Technical standards VDI
Thermische Nutzung des Untergrundes - Erdgekoppelte Wärmepumpenanlagen.