Analysis and comparison between different energy consumption performances of a CO_2 trans-critical booster system with Modulating Ejectors and parallel compression in various configurations and different climate conditions

摘要

In this paper, the performance of a real CO_2 trans-critical booster refrigeration system equipped withmodulating ejectors and parallel compression has been analyzed. The system can operate in three differentconfigurations: standard booster, Modulating Ejector (EMJ) and parallel compression. Energy consumptionand efficiency of the three configurations have been compared in three different climate conditions: Madrid,Athens and Riyadh. For each city, experimental tests have been carried out considering a set of twelverepresentative temperature profiles, one for each month, and a varying thermal load. The annual energyconsumption has been estimated basing on measured data. Results show that the annual energy saving rangesfrom 10% to 12% considering EMJ over standard booster, with peaks of 20%. Parallel compression comparedwith standard booster reaches an annual energy saving between 2% and 3% with peaks of 8%. The highestenergy saving values have been registered for warmer profiles with EMJ configuration.