22 May 2008
Utilization of naturally occurring and ecologically safe substances as working fluids in heat
pump systems represent an environmental friendly and long-term solution to the HFCs. The
most important natural working fluids include ammonia, hydrocarbons and carbon dioxide.
Ammonia heat pumps represent an energy efficient alternative for heating and cooling of
non-residential buildings as well as for district heating and cooling systems.
This paper discusses the main characteristics of ammonia heat pump systems for heating
and cooling of non-residential buildings including thermodynamic cycle analysis, recommended
system design and dimensioning, component selection and system performance.
The impact of the heat distribution system on system performance is also discussed. A
number of large-capacity ammonia heat pump systems in Norway are presented including
installations in office buildings, hospitals and district heating and cooling systems.