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A theoretical and experimental analysis of a self-contained R-290 refrigeration unit applied to a glass door reach-in supermarket display case.

Number: pap. 2456

Author(s) : RONZONI A. F., HEINZLE G., FURLAN A. A., et al.

Summary

This paper presents a theoretical and experimental analysis of a self-contained variable speed R-290 refrigeration unit applied to a typical 1.25m long two-glass-door reach-in supermarket display case, originally designed to run on an incorporated R-404A single speed refrigeration unit. A semi-empirical mathematical model was put forward to predict system energy consumption and cabinet psychometrics. One energy consumption test was performed at 32°C ambient temperature and used to calibrate components overall heat transfer coefficients. The model validation was then performed by using the calibrated model to predict the system energy consumption at 27°C ambient temperature. A good agreement between experimental and numerical results was found with errors lower than 1% and 3% on energy consumption and compressor running time ratio respectively. The model was also applied to predict annual energy consumption for two units (R-290 self-contained and R-404A incorporated) as a function of the monthly average ambient temperatures for Joinville, Brazil. The simulation results indicate an annual energy consumption saving up to 30% when a self-contained R-290 variable speed hermetic refrigeration unit is applied to a cabinet originally designed for an incorporated R-404A single speed compressor refrigeration unit.

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Pages: 10

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Details

  • Original title: A theoretical and experimental analysis of a self-contained R-290 refrigeration unit applied to a glass door reach-in supermarket display case.
  • Record ID : 30024564
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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