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Introduction of an ejector for industrial scale CO2 systems.

Number: 2583

Author(s) : SIMON F., PFAFFL J., JAVERSCHEK O.

Summary

The European F-gas Regulation EU 517/2014 demands the incremental phase out of the most common F-gases such as R134a, R410A, R404A, leading to the need of finding future proven refrigerants. Transcritical CO2 systems are in the meantime state of the art in commercial refrigeration in Europe. The natural refrigerant with a global warming potential of one is now gaining attention for industrial scale applications as well. Facing strongly increasing energy costs and a growing environmental awareness, energy efficiency becomes one of the most important factors for successfully designing an HVAC&R system. One approach to fulfil both requirements is the usage of a CO2 vapor compression cycle in combination with an ejector. The ejector utilizes the energy, usually lost during the throttling process of an expansion valve, to create a pressure hub, thus unloading the compressors and increasing the energy efficiency. The presented paper discusses the implementation of different ejectors into a CO2 system calculation selection software. The nominal mass flow of said ejectors at gas cooler outlet conditions of 31°C/92 bara, varies between 800 kg/h and 9500 kg/h. In combination with newly developed CO2 compressors with eight cylinder design, the software allows the calculation of industrial scale CO2 booster systems with flash gas bypass (FGB), with parallel compression and high lift ejector. Furthermore, the software is then used to examine the impact of ejectors on industrial scale CO2 systems by comparing different CO2 cycle layouts and the respective coefficients of performances. Additionally, the impact on the seasonal energy efficiency ratio is investigated.

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Pages: 10 p.

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  • Original title: Introduction of an ejector for industrial scale CO2 systems.
  • Record ID : 30030782
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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