H.-M. Hellmann

Space heating systems: The 4th part of the district heating system

H.-M. Hellmann, 1998 .

Operation and performance of a 350 kW (100 RT) single-effect/double-lift absorption chiller in a district heating network

Felix Ziegler, H.-M. Hellmann, S. Demmel, 1998 .

Neuer Absorptions-Kaltwassersatz für den Einsatz in Fernwärmenetzen

H.-M. Hellmann, S. Demmel, C. J. Schweigler, 1996 .