Impact of hysteresis on caloric cooling performance

Masche, Marvin; Ianniciello, Lucia; Tušek, Jaka; Engelbrecht, Kurt

doi:10.1016/j.ijrefrig.2020.10.012

Cited by 22 publications

(16 citation statements)

References 59 publications

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“…In addition to its influence on operating pressure, hysteresis adversely impacts the second-law efficiency and coefficient of performance (COP) of any caloric cooling cycle because of dissipative heat losses 16 , 17 . The impact of hysteresis on efficiency can be quantified by calculating an idealized thermodynamic efficiency, η —relative to the Carnot efficiency—with a simple material model that accounts for dissipative losses due to hysteresis in a Carnot-like cycle 16 : …”

Section: Resultsmentioning

confidence: 99%

“…These transitions, however, often have large thermal hysteresis, occur away from ambient temperature, or have only moderate sensitivity to applied pressure. This highlights a longstanding challenge across all classes of caloric materials: field-induced phase transitions that lead to large isothermal entropy and adiabatic temperature changes are often accompanied by substantial hysteresis, which increases the magnitude of the applied field required to capture the full entropy of the transition and reduces the efficiency of each cooling cycle 14 – 17 .…”

Section: Introductionmentioning

confidence: 99%

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Colossal barocaloric effects with ultralow hysteresis in two-dimensional metal–halide perovskites

et al. 2022

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Pressure-induced thermal changes in solids—barocaloric effects—can be used to drive cooling cycles that offer a promising alternative to traditional vapor-compression technologies. Efficient barocaloric cooling requires materials that undergo reversible phase transitions with large entropy changes, high sensitivity to hydrostatic pressure, and minimal hysteresis, the combination of which has been challenging to achieve in existing barocaloric materials. Here, we report a new mechanism for achieving colossal barocaloric effects that leverages the large volume and conformational entropy changes of hydrocarbon order–disorder transitions within the organic bilayers of select two-dimensional metal–halide perovskites. Significantly, we show how the confined nature of these order–disorder phase transitions and the synthetic tunability of layered perovskites can be leveraged to reduce phase transition hysteresis through careful control over the inorganic–organic interface. The combination of ultralow hysteresis and high pressure sensitivity leads to colossal reversible isothermal entropy changes (>200 J kg−1 K−1) at record-low pressures (<300 bar).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Colossal barocaloric effects with ultralow hysteresis in two-dimensional metal–halide perovskites

et al. 2022

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“…Given the uncertainty associated with extracting unit-cell parameters from powder patterns within the phase co-existence region, we estimate that the upper bound for the width of the hysteresis loop is 30 bar. It is worth emphasizing that isothermal hysteresis loops, which are more directly relevant to pressure-induced cooling cycles than isobaric hysteresis loops, are rarely reported for barocaloric materials that undergo first-order phase transitions, , presumably due to the challenge of inducing a fully reversible phase change at easily accessible pressures.…”

Section: Resultsmentioning

confidence: 99%

Driving Barocaloric Effects in a Molecular Spin-Crossover Complex at Low Pressures

et al. 2022

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Barocaloric effectsthermal changes in a material induced by applied hydrostatic pressureoffer promise for creating solid-state refrigerants as alternatives to conventional volatile refrigerants. To enable efficient and scalable barocaloric cooling, materials that undergo high-entropy, reversible phase transitions in the solid state in response to a small change in pressure are needed. Here, we report that pressure-induced spin-crossover (SCO) transitions in the molecular iron(II) complex Fe[HB(tz)3]2 (HB(tz)3 – = bis[hydrotris(1,2,4-triazol-1-yl)borate]) drive giant and reversible barocaloric effects at easily accessible pressures. Specifically, high-pressure calorimetry and powder X-ray diffraction studies reveal that pressure shifts as low as 10 bar reversibly induce nonzero isothermal entropy changes, and a pressure shift of 150 bar reversibly induces a large isothermal entropy change (>90 J kg–1 K–1) and adiabatic temperature change (>2 K). Moreover, we demonstrate that the thermodynamics of the SCO transition can be fine-tuned through systematic deuteration of the tris(triazolyl)borate ligand. These results provide new insights into pressure-induced SCO transitions and further establish SCO materials as promising barocaloric materials.

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mentioning

confidence: 99%

“…In addition to its influence on operating pressure, hysteresis adversely impacts the second-law efficiency and coefficient of performance (COP) of any caloric cooling cycle because of dissipative heat losses 14,15 . The impact of hysteresis on efficiency can be quantified by calculating an idealized thermodynamic efficiency, h-relative to the Carnot efficiency-with a simple material model that accounts for dissipative losses due to hysteresis in a Carnot-like cycle 14 :…”

mentioning

confidence: 99%

Colossal Barocaloric Effects with Ultralow Hysteresis in Two-Dimensional Metal–Halide Perovskites

Mason¹,

Seo²,

McGillicuddy³

et al. 2021

Preprint

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Nearly 4,400 TWh of electricity—20% of the total consumed in the world—is used each year by refrigerators, air conditioners, and heat pumps for cooling. In addition to the 2.3 Gt of carbon dioxide emitted during the generation of this electricity, the vapor-compression-based devices that provided the bulk of this cooling emitted fluorocarbon refrigerants with a global warming potential equivalent to 1.5 Gt of carbon dioxide into the atmosphere. With population and economic growth expected to dramatically increase over the next several decades, the development of alternative cooling technologies with improved efficiency and reduced emissions will be critical to meeting global cooling needs in a more sustainable fashion. Barocaloric materials, which undergo thermal changes in response to applied hydrostatic pressure, offer the potential for solid-state cooling with high energy efficiency and zero direct emissions, as well as faster start-up times, quieter operation, greater amenability to miniaturization, and better recyclability than conventional vapor-compression systems. Efficient barocaloric cooling requires materials that undergo reversible phase transitions with large entropy changes, high sensitivity to hydrostatic pressure, and minimal hysteresis, the combination of which has been challenging to achieve in existing barocaloric materials. Here, we report a new mechanism for achieving colossal barocaloric effects near ambient temperature that exploits the large volume and conformational entropy changes of hydrocarbon chain-melting transitions within two-dimensional metal–halide perovskites. Significantly, we show how the confined nature of these order–disorder phase transitions and the synthetic tunability of layered perovskites can be leveraged to reduce phase transition hysteresis through careful control over the inorganic–organic interface. The combination of ultralow hysteresis (< 1.5 K) and high barocaloric coefficients (> 20 K/kbar) leads to large reversible isothermal entropy changes (> 200 J/kg•K) at record-low pressures (< 300 bar). We anticipate that these results will help facilitate the development of barocaloric cooling technologies and further inspire new materials and mechanisms for efficient solid-state cooling.

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Impact of hysteresis on caloric cooling performance

Cited by 22 publications

References 59 publications

Colossal barocaloric effects with ultralow hysteresis in two-dimensional metal–halide perovskites

Colossal barocaloric effects with ultralow hysteresis in two-dimensional metal–halide perovskites

Driving Barocaloric Effects in a Molecular Spin-Crossover Complex at Low Pressures

Colossal Barocaloric Effects with Ultralow Hysteresis in Two-Dimensional Metal–Halide Perovskites

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