The CEP laboratory is currently investigating the use of thermally-powered absorption refrigeration systems in solar cooling and combined cooling, heat and power (CCHP or trigeneration) systems. Thermally-powered refrigeration technologies such as the ammonia-water Diffusion Absorption Refrigeration (DAR) cycle can be easily integrated with solar thermal collectors to provide solar-powered cooling. The DAR cycle exploits the principle of partial pressure to provide cooling, through the use of an auxiliary gas in the evaporator (typically hydrogen or helium). DAR systems use bubble-pumps for fluid circulation (hence have no moving parts) and can be manufactured as single-piece units suitable for small-scale (< 1kW output) low-cost applications.

iffusion Absorption Refrigeration (DAR) system