REDUCTION OF ENERGY CONSUMPTION BY APPLYING A NEW GENERATION OF CO2 COMPRESSORS

摘要

The development of transcritical CO_2 systems in commercial refrigeration can be considered to be in atransition phase from cutting edge to state-of-the-art technology. However, the stress field of newdevelopments is strong and characterized by challenging demands from the market: Further improvement ofthe annual energy efficiency, reduced system complexity and a decreased cost of ownership. One key tosuccess in commercial refrigeration is the application of a new generation of energy efficient CO_2compressors in a so-called baseline system. The features of this highly efficient compressor range, which iscalled ECOLINE+, is explained in this paper. The European standard EN13215 is considered as the standardmethod for the evaluation of the annual energy efficiencies. A more complex and time consuming method tocalculate the annual energy efficiency is to consider the prevailing climate, more specific load profiles , thesystem configuration, operating times and resulting operating conditions of the compressors applied. Thiswork provides an analytical study of different methods to calculate the annual energy efficiency for the newcompressor generation compared to the standard compressor range and discusses the results of thecomparison. The work proves that the relative potential for savings of the new generation of compressors canbe determined with the two different methods and is in the range of 13 % for the discussed compressormodels.