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Impact of hysteresis on caloric cooling performance
ID Masche, M. (Author), ID Ianniciello, Lucia (Author), ID Tušek, Jaka (Author), ID Engelbrecht, Kurt (Author)

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Abstract
Caloric cooling relies on reversible temperature changes in solids driven by an externally applied field, such as a magnetic field, electric field, uniaxial stress or hydrostatic pressure. Materials exhibiting such a solid-state caloric effect may provide the basis for an alternative to conventional vapor compression technologies. First-order phase transition materials are promising caloric materials, as they yield large reported adiabatic temperature changes compared to second-order phase transition materials, but exhibit hysteresis behavior that leads to possible degradation in the cooling performance. This work quantifies numerically the impact of hysteresis on the performance of a cooling cycle using different modeled caloric materials and a regenerator with a fixed geometry. A previously developed 1D active regenerator model has been used with an additional hysteresis term to predict how modeled materials with a range of realistic hysteresis values affect the cooling performance. The performance is quantified in terms of cooling power, coefficient of performance (COP), and second-law efficiency for a range of operating conditions. The model shows that hysteresis reduces efficiency, with COP falling by up to 50% as the hysteresis entropy generation (qhys) increases from 0.5% to 1%. At higher working frequencies, the cooling performance decreases further due to increased internal heating of the material. Regenerator beds using materials with lower specific heat and higher isothermal entropy change are less affected by hysteresis. Low specific heat materials show positive COP and cooling power up to 2% of qhys whereas high specific heat materials cannot tolerate more than 0.04% of qhys.

Language:English
Keywords:hysteresis, caloric effect, numerical modeling, regenerator
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2021
Number of pages:Str. 302-312
Numbering:Vol. 121
PID:20.500.12556/RUL-122206 This link opens in a new window
UDC:519.8:539.98(045)
ISSN on article:0140-7007
DOI:10.1016/j.ijrefrig.2020.10.012 This link opens in a new window
COBISS.SI-ID:39776771 This link opens in a new window
Publication date in RUL:27.11.2020
Views:926
Downloads:319
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Record is a part of a journal

Title:International journal of refrigeration
Shortened title:Int. j. refrig.
Publisher:Elsevier Science
ISSN:0140-7007
COBISS.SI-ID:9140997 This link opens in a new window

Secondary language

Language:Slovenian
Title:Impact de l'hystérésis sur les performances de refroidissement calorique
Keywords:histereze, kalorični učinek, numerično modeliranje, regenerator

Projects

Funder:EC - European Commission
Funding programme:H2020
Project number:814865
Name:Renewables for clean energy buildings in a future power system
Acronym:RES4BUILD

Funder:Other - Other funder or multiple funders
Funding programme:Independent Research Fund Denmark
Project number:8022-00277B
Name:Maximizing the lifetime of elastocaloric systems through compression operation

Funder:ARRS - Slovenian Research Agency
Project number:J2-9253
Name:Multikalorično hlajenje

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