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Market introduction of commercially viable CO2 supermarket refrigeration systems.

Author(s) : FINCKH O., SIENEL T.

Summary

This paper describes the market introduction of low temperature (LT) and medium temperature (MT) direct expansion carbon dioxide refrigeration systems in supermarket applications. These systems have been developed and deployed over the last five to ten years. However, a commercially viable solution can only be introduced to the market in a configuration which is cost effective, efficient, and reliable. Part of the path to cost effectiveness has started at the design, where the majority of the components are limited to 40 bar max operational pressure, particularly in the supermarket area. This has led to a double expansion system architecture, where the MT system has three pressure levels. The LT system is connected to the MT system in a booster configuration, leading to four pressure levels in the complete system. The five highly coupled control loops involving LT-suction pressure, MT suction pressure, gas cooler exit temperature, high pressure and medium pressure have to be kept in check using a set of variable speed and on/off actuators (compressors, fans and valves). To tune these parameters has presented significant challenges, particularly after realizing the closed coupling between each loop. Experience to date shows a path using dynamic simulations, laboratory testing and field experience to tune these control parameters and realizing the benefit in less energy consumption and greater product safety.

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Pages: 2010-2

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Details

  • Original title: Market introduction of commercially viable CO2 supermarket refrigeration systems.
  • Record ID : 2010-1506
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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