22 May 2008
The content of the paper is the development, experimental investigation and
simulation of the thermally driven single-effect ammonia/water absorption heat pump/chiller
for air-conditioning and refrigeration systems for residential, commercial and industrial
applications. The novel chillii® PSC has a cooling capacity of 10 kW and compact design.
The peculiarities of the chiller are the special design of the membrane pump for the solution
circulation, the mechanical solution controller and the vertical falling-film tubular absorber
and evaporator, respectively. The experimental investigations at the two test stands of
SolarNext and Pink showed that the chiller reaches evaporator outlet temperatures from
15°C down to -5°C at heating temperatures from 65°C to 115°C. The investigated recooling
temperatures are between 24°C and 40°C. A TRNSYS simulation of a solar air-conditioning
system with a model of the chillii® PSC10 was carried out to analyse the performance
behaviour of such system. For Zurich and Madrid the results showed that the system design
is sufficient for different climatic conditions and collector as well as heat storage sizes.