Experimental Results from R245fa Ejector Chiller

This paper presents new experimental results from the DIEF prototype ejector chiller, which is operating since 2011 and has undergone several refinements, as discussed elsewhere. The prototype features a modified CRMC design of the ejector and a cooling power of a 40 kWf. The working fluid, R245fa, has favourable thermodynamic properties (e.g. dry expansion and moderate pressure at generator) and allows sub-zero temperatures at evaporator. Therefore, even if the prototype was designed for 5°C evaporation temperature, a set of low temperature tests has been carried on. The results show that the CRMC ejector chiller is rather flexible with respect to off-design conditions and, once specifically optimized, could be a candidate for sub-zero applications, unfeasible for water-lithium bromide absorption chillers.