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Dynamic modeling of CO2 supermarket refrigeration system.

Number: pap. n. R29, 2442

Author(s) : SHI R., FU D., FENG Y., et al.

Summary

Physics-based dynamic model of a transcritical CO2 supermarket refrigeration system providing cooling capacity for medium- and low-temperature food cabinets, racks, and cold rooms has been developed using equation-based software Dymola. The main motivation for developing such a model is to develop control algorithms and verify their performance and robustness in the absence of physical prototypes. In this paper, the effects of 1) one- and two-dimensional gas cooler models, 2) discretization of the gas cooler outlet line, and 3) gas cooler natural convection are investigated using the developed system model. It has been observed that two-dimensional gas cooler model gives more accurate system performance prediction when the gas cooler fans were running at moderate speeds compared to one dimensional model. It has also been noted that by increasing the pipe discretization, the modeled transport delay time was increased, and finally that the natural convection caused by the gas cooler frame height has a very large impact on the system performance when the gas cooler fans are shut down.

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Pages: 8 p.

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Details

  • Original title: Dynamic modeling of CO2 supermarket refrigeration system.
  • Record ID : 30001005
  • Languages: English
  • Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2010/07/12

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