23 March 2006

A novel thermally-activated absorption cooling machine based on the diffusion absorption principle

This report describes the development, investigation and simulation of a single-effect solar-heat-driven
ammonia/water diffusion absorption cooling machine (DACM) with a design cooling capacity of 2.5 kW.
The indirectly-heated, solar-powered generator with its bubble pump is the main new feature of this cooling
machine. The results from the prototypes showed stable and continuous temperature and pressure
levels. Coeffi cients of performance (COP) were between 0.1 and 0.45, while the continuous evaporator
cooling performance was between 0.5 kW and 1.6 kW. An expanded, steady-state DACM model was also
set up, based on the characteristic equation of sorption chillers.