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Cycle architectures for two-door refrigerators: Performance breakdown.

Author(s) : LISTON V. J., SANTOS G. Z., MONTAGNER G. P., RONZONI A. F., HERMES C. J. L.

Type of article: IJR article

Summary

In this study, four different refrigeration cycle architectures for two-door applications were evaluated and compared: (i) fan-and-damper single-evaporator cycle, (ii) serial/parallel (hybrid) dual-evaporator architecture, (iii) parallel dual-evaporator architecture, and (iv) two independent single-evaporator cycles. The performance analysis was carried out by means of quasi-steady mathematical models that combine steady-state submodels for the refrigeration loop with transient submodels for the refrigerated compartments. The numerical calculations were conducted in such a way that layers of internal and external irreversibility could be introduced into the analysis, from a fully-reversible Carnot cycle to the cycling behavior imposed by the control logic. The dual-evaporator cycles, which are far more complex than single-evaporator ones, were prototyped and tested in a climate chamber to gather data used to calibrate and validate the mathematical models. A methodology was devised on thermodynamic grounds to allow a fair comparison between the architectures. The system with two independent single-evaporator cycles performed the best, followed by parallel and hybrid dual-evaporator loops, and the single-evaporator fan-and-damper solution. Also, the replacement of isobutane with n-butane in the fresh-food branch of the two independent cycles led to an extra 5% energy consumption reduction under the same conditions, providing better matching of the compressor capacity to the thermal loads.

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Pages: 275-285

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Details

  • Original title: Cycle architectures for two-door refrigerators: Performance breakdown.
  • Record ID : 30031727
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 150
  • Publication date: 2023/06
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2023.01.027

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