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Energy and cost optimization of household refrigerators: a simulation-based design approach.

Number: pap. ID: 675

Author(s) : NEGRÃO C. O. R., HERMES C. J. L.

Summary

A simplified design methodology for household refrigeration systems focused on both energy savings and cost reduction is proposed in this study. Mathematical models were put forward for each of the system components and used to simulate the energy performance of the entire refrigeration system. The system simulation model was validated against experimental data obtained for a single-door 300-liter vertical freezer. It was found that the model predictions for the energy consumption, cooling capacity and runtime ratio deviated from the experimental data within an error band of ±10%. An optimization algorithm was built upon the simulation model to size the condenser and evaporator heat transfer areas, and also the cabinet insulation thickness in order to minimize the total cost of the refrigeration system for a target energy consumption. An asymptotic relation between the minimum cost and the minimum energy consumption was achieved, bringing about a system configuration that consumes 14% less energy than the baseline system if the total cost remains unchanged. The effect of the compressor stroke and efficiency on the minimum system cost was also taken into account. It was demonstrated that the refrigerator/freezer becomes less costly in cases where highly efficient compressors are used in low energy consumption refrigeration systems.

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Pages: 8 p.

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Details

  • Original title: Energy and cost optimization of household refrigerators: a simulation-based design approach.
  • Record ID : 30002122
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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