Efficiency increase in carbon dioxide refrigeration technology with parallel compression

; ; ; (). Efficiency increase in carbon dioxide refrigeration technology with parallel compression: doi.org/10.1093/ijlct/ctw002. International Journal of Low-Carbon Technologies, 12, 2. 171-180. Peer reviewed.

In this article, we will review the comparison between a CO2 refrigeration system with a parallel
compressor and a conventional carbon dioxide refrigeration machine. In order to carry out the
comparison, a numerical model has been generated showing a good correlation to experimental data
obtained with a fully instrumented test rig machine. We can determine under which conditions an
increase in the energy efficiency ratio (EER) of 10% and more can be expected with a parallel compression
system. The results will help users to decide upon economically viable refrigeration systems, depending on
the operational conditions of the machine. In usual operating conditions, the achievable increase in the
EER by the parallel compressor has been determined; furthermore, it showed that a low evaporation
temperature and a high temperature at the outlet of the gas cooler have a positive effect on the parallel
compression circuit. With respect to the intermediate pressure, an optimum can be specified at low
evaporation temperatures.