IIR document

Energy analysis of integrated CO2 commercial refrigeration systems under different climate conditions.

Number: pap. 0027

Author(s) : DUGARIA S., AZZOLIN M., CALABRESE L., et al.


The strong demand for phasing out refrigerants with high GWP has pushed the research towards the study of sustainable alternatives like natural refrigerants. In the recent years, carbon dioxide has increased its market share in the field of commercial refrigeration and has proven to be a viable solution for the replacement of HFC systems. One of the most common approaches to make CO2 refrigerating systems economically and environmentally sustainable for all types of climate is to fulfil all the thermal demands with one single unit. The purpose of this paper is to study different solutions that can improve the performance of an integrated CO2 booster system for supermarket application. The refrigeration systems studied here integrate heat exchangers for the air conditioning and two stages heat recovery, for sanitary hot water production and space heating. In addition, parallel compression and flooded evaporators are considered in order to reduce the energy consumption of the compressors. Steady-state models of the refrigeration cycles are developed to simulate the hourly performance of the investigated solutions across a year. The boundary conditions are based on field-measurements of an existing system. Measured values of the compressor efficiency are adopted for this analysis. The yearly performance of the proposed solutions are compared in terms of energy consumption and working conditions in moderate and warm climates.

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  • Original title: Energy analysis of integrated CO2 commercial refrigeration systems under different climate conditions.
  • Record ID : 30025698
  • Languages: English
  • Source: 8th Conference on Ammonia and CO2 Refrigeration Technology. Proceedings: Ohrid, North Macedonia, Avril 11-13, 2019.
  • Publication date: 2019/04/11
  • DOI: http://dx.doi.org/10.18462/iir.nh3-co2.2019.0027


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