Age-related efficiency loss of household refrigeration appliances: Development of an approach to measure the degradation of insulation properties

C. Hueppe, J. Geppert, R. Stamminger, H. Wagner, H. Hoelscher, J. Vrabec, A. Paul, A. Elsner, W. Becker, U. Gries, A. Freiberger, Applied Thermal Engineering 173 (2020).

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Journal Article | Published | English
Author
Hueppe, Christian; Geppert, Jasmin; Stamminger, Rainer; Wagner, Hendrik; Hoelscher, Heike; Vrabec, Jadran; Paul, AndreasLibreCat; Elsner, AndreasLibreCat; Becker, Wolfgang; Gries, Ulrich; Freiberger, Alfred
Abstract
Despite the omnipresence of household refrigeration appliances, there is still a lack of knowledge about their agerelated efficiency loss over time. Past studies provide basic evidence for increasing electricity consumption of cooling appliances with ageing but fail to investigate the associated technical wear. Concentrating on the degradation of the thermal insulation, we first determined the ageing process of sealed samples of polyurethane rigid foam by investigating changes in cell gas composition and thermal conductivity over time. Simultaneously, the main challenge was to develop an approach that investigates the age-related efficiency loss of the insulation without its destruction. This testing procedure is referred to as the Bonn method. The non-destructive Bonn method was applied to varying refrigerator models in a series of successive experiments to evaluate the insulation degradation over time. Subsequently, the physical relationship between the test value of the Bonn method and the heat transfer through the multi-layered compartment walls of domestic refrigeration appliances was established, ultimately characterising the degrading insulation in terms of increasing heat transfer. Our results give substantiated evidence that the efficiency loss of cooling appliances is greatly influenced by insulation degradation over time. The ageing of sealed samples of polyurethane rigid foam indicates a large initial increase of thermal conductivity by 15% within the first year, corresponding to a change in cell gas composition. These results are in line with those of the Bonn method, emphasising an increasing heat flow through the multi-layered compartment walls of domestic refrigerators with ageing. Therewith, the present study is of significance to a wide range of stakeholders and forms the basis for future research.
Publishing Year
Journal Title
Applied Thermal Engineering
Volume
173
Article Number
115113
ISSN
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Hueppe C, Geppert J, Stamminger R, et al. Age-related efficiency loss of household refrigeration appliances: Development of an approach to measure the degradation of insulation properties. Applied Thermal Engineering. 2020;173. doi:10.1016/j.applthermaleng.2020.115113
Hueppe, C., Geppert, J., Stamminger, R., Wagner, H., Hoelscher, H., Vrabec, J., Paul, A., Elsner, A., Becker, W., Gries, U., & Freiberger, A. (2020). Age-related efficiency loss of household refrigeration appliances: Development of an approach to measure the degradation of insulation properties. Applied Thermal Engineering, 173, Article 115113. https://doi.org/10.1016/j.applthermaleng.2020.115113
@article{Hueppe_Geppert_Stamminger_Wagner_Hoelscher_Vrabec_Paul_Elsner_Becker_Gries_et al._2020, title={Age-related efficiency loss of household refrigeration appliances: Development of an approach to measure the degradation of insulation properties}, volume={173}, DOI={10.1016/j.applthermaleng.2020.115113}, number={115113}, journal={Applied Thermal Engineering}, publisher={Elsevier}, author={Hueppe, Christian and Geppert, Jasmin and Stamminger, Rainer and Wagner, Hendrik and Hoelscher, Heike and Vrabec, Jadran and Paul, Andreas and Elsner, Andreas and Becker, Wolfgang and Gries, Ulrich and et al.}, year={2020} }
Hueppe, Christian, Jasmin Geppert, Rainer Stamminger, Hendrik Wagner, Heike Hoelscher, Jadran Vrabec, Andreas Paul, et al. “Age-Related Efficiency Loss of Household Refrigeration Appliances: Development of an Approach to Measure the Degradation of Insulation Properties.” Applied Thermal Engineering 173 (2020). https://doi.org/10.1016/j.applthermaleng.2020.115113.
C. Hueppe et al., “Age-related efficiency loss of household refrigeration appliances: Development of an approach to measure the degradation of insulation properties,” Applied Thermal Engineering, vol. 173, Art. no. 115113, 2020, doi: 10.1016/j.applthermaleng.2020.115113.
Hueppe, Christian, et al. “Age-Related Efficiency Loss of Household Refrigeration Appliances: Development of an Approach to Measure the Degradation of Insulation Properties.” Applied Thermal Engineering, vol. 173, 115113, Elsevier, 2020, doi:10.1016/j.applthermaleng.2020.115113.

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