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An experimental study on the effect of a new defrosting strategy on the energy consumption of household refrigerators.

Number: pap. 2056

Author(s) : KNABBEN F. T., MELO C.

Summary

In a previous study, an experimental testing apparatus was constructed and used to measure the defrosting efficiency of different heaters working under different control strategies. Based on the obtained results two types of heaters (calrod and distributed) and two power modes (integral and steps) were selected for this study. In the integral mode, the power was held at 160 W and the defrosting period set to 17.0 and 19.3 min for the distributed and calrod heaters, respectively. Conversely, in the steps mode, the power was gradually reduced from 160 to 20 W and the defrosting period set to 28.5 and 22.3 min for the distributed and calrod heaters, respectively. The energy consumption of a typical top-mount frost-free refrigerator running with the four combinations of heater and control mode was measured following both the ISO and AHAM standards. Changes were made in the product electronic
board to vary the power and time of the steps. A glass window was also installed in the rear wall of the refrigerator to visually monitor the defrosting process. A 4.3 % drop in the energy consumption was achieved when the pair calrod heater/integral mode was replaced by the pair distributed heater/steps mode, independently of the standard used. Clogging tests were also carried out to check the robustness of the different defrosting strategies.

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Pages: 9

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Details

  • Original title: An experimental study on the effect of a new defrosting strategy on the energy consumption of household refrigerators.
  • Record ID : 30018852
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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