@article{29208, abstract = {{The parameters required to calculate the energy efficiency of household refrigerating appliances (i.e. refrigerators, freezers and their combinations) are determined by standard measurements. According to regulations, these measurements are carried out when the appliances are new. It is known from previous studies that various technical aging mechanisms can increase electrical energy consumption by up to 36 % over a product lifespan of 18 years. In order to determine the time dependence of the energy consumption of household refrigerating appliances, repeated measurements are carried out in this work. Eleven new appliances are examined under standard measurement conditions. After just two years of operation, an additional energy consumption of up to 11 % is determined. Furthermore, 21 older appliances that had previously been measured in new condition are tested again after up to 21 years of operation. For these older appliances, an average increase of energy consumption of 28 % is found. For individual appliances, the maximum increase is 36 %. An aging model is developed on the basis of these measurement results, which may help to predict the aging-related increase of energy consumption of household refrigerating appliances. This model shows an average increase in energy consumption of 27 % for an appliance age of 16 years. Supplemental performance tests of eight compressors do not show any significant aging effects related to these devices after two years of operation. Furthermore, measurements of the thermal conductivity of aged polyurethane foam test samples are carried out and an increase of its thermal conductivity of 26 % over a period of about three years is determined.}}, author = {{Paul, Andreas and Baumhögger, Elmar and Elsner, Andreas and Reineke, Michael and Hueppe, Christian and Stamminger, Rainer and Hoelscher, Heike and Wagner, Hendrik and Gries, Ulrich and Becker, Wolfgang and Vrabec, Jadran}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, keywords = {{Industrial and Manufacturing Engineering, Energy Engineering and Power Technology}}, publisher = {{Elsevier BV}}, title = {{{Impact of aging on the energy efficiency of household refrigerating appliances}}}, doi = {{10.1016/j.applthermaleng.2021.117992}}, volume = {{205}}, year = {{2022}}, } @article{40644, author = {{Al-Lami, Abbas Jarullah Sangoor and Kenig, Eugeny Y. and Inguva, Venkatesh}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, keywords = {{Industrial and Manufacturing Engineering, Energy Engineering and Power Technology}}, publisher = {{Elsevier BV}}, title = {{{Numerical analysis of conjugate heat transfer within internally channeled tubes}}}, doi = {{10.1016/j.applthermaleng.2022.119596}}, volume = {{223}}, year = {{2022}}, } @article{21512, 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.}}, 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 Freiberger, Alfred}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, publisher = {{Elsevier}}, title = {{{Age-related efficiency loss of household refrigeration appliances: Development of an approach to measure the degradation of insulation properties}}}, doi = {{10.1016/j.applthermaleng.2020.115113}}, volume = {{173}}, year = {{2020}}, } @article{24272, author = {{Knoke, Torben and Kronberg, Alexander and Glushenkov, Maxim and Kenig, Eugeny}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, number = {{5}}, pages = {{114382}}, title = {{{On the design of heat exchanger equipment for novel-type isobaric expansion engines}}}, doi = {{10.1016/j.applthermaleng.2019.114382}}, volume = {{167}}, year = {{2019}}, } @article{23783, author = {{Knoke, Torben and Kronberg, Alexander and Glushenkov, Maxim and Kenig, Eugeny}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, title = {{{On the design of heat exchanger equipment for novel-type isobaric expansion engines}}}, doi = {{10.1016/j.applthermaleng.2019.114382}}, year = {{2019}}, } @article{15036, author = {{Piper, M. and Zibart, A. and Djakow, Eugen and Springer, R. and Homberg, W. and Kenig, E.Y.}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, pages = {{142--146}}, title = {{{Heat transfer enhancement in pillow-plate heat exchangers with dimpled surfaces: A numerical study}}}, doi = {{10.1016/j.applthermaleng.2019.02.082}}, year = {{2019}}, } @article{13161, author = {{Dubberke, Frithjof H. and Linnemann, Matthias and Abbas, Wameedh Khider and Baumhögger, Elmar and Priebe, Klaus-Peter and Roedder, Maximilian and Neef, Matthias and Vrabec, Jadran}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, pages = {{958--964}}, title = {{{Experimental setup of a cascaded two-stage organic Rankine cycle}}}, doi = {{10.1016/j.applthermaleng.2017.11.137}}, year = {{2017}}, } @article{32493, author = {{Rakesh Ranga, H.R. and Korobeinichev, O.P. and Harish, A. and Raghavan, Vasudevan and Kumar, A. and Gerasimov, I.E. and Gonchikzhapov, M.B. and Tereshchenko, A.G. and Trubachev, S.A. and Shmakov, A.G.}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, keywords = {{Industrial and Manufacturing Engineering, Energy Engineering and Power Technology}}, pages = {{477--491}}, publisher = {{Elsevier BV}}, title = {{{Investigation of the structure and spread rate of flames over PMMA slabs}}}, doi = {{10.1016/j.applthermaleng.2017.11.041}}, volume = {{130}}, year = {{2017}}, } @article{32481, author = {{Rakesh Ranga, H.R. and Korobeinichev, O.P. and Harish, A. and Raghavan, Vasudevan and Kumar, A. and Gerasimov, I.E. and Gonchikzhapov, M.B. and Tereshchenko, A.G. and Trubachev, S.A. and Shmakov, A.G.}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, keywords = {{Industrial and Manufacturing Engineering, Energy Engineering and Power Technology}}, pages = {{477--491}}, publisher = {{Elsevier BV}}, title = {{{Investigation of the structure and spread rate of flames over PMMA slabs}}}, doi = {{10.1016/j.applthermaleng.2017.11.041}}, volume = {{130}}, year = {{2017}}, } @article{45018, author = {{Dubberke, Frithjof H. and Linnemann, Matthias and Abbas, Wameedh Khider and Baumhögger, Elmar and Priebe, Klaus-Peter and Roedder, Maximilian and Neef, Matthias and Vrabec, Jadran}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, keywords = {{Industrial and Manufacturing Engineering, Energy Engineering and Power Technology}}, pages = {{958--964}}, publisher = {{Elsevier BV}}, title = {{{Experimental setup of a cascaded two-stage organic Rankine cycle}}}, doi = {{10.1016/j.applthermaleng.2017.11.137}}, volume = {{131}}, year = {{2017}}, }