Elastocaloric cooling: From fundamental thermodynamics to solid state air conditioning

Schmidt, Marvin; Kirsch, Susanne‐Marie; Seelecke, Stefan; Schütze, Andreas

doi:10.1080/23744731.2016.1186423

Cited by 37 publications

(41 citation statements)

References 33 publications

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“…It is important to note that the different figures of merit depend on each other. The temperature span Δ T device will depend on the thermal load as well as on cooling power

\dot{Q} \binom{cool}{0}

and, accordingly, the efficiency depends on the temperature span . Thus, COP values and device cooling powers found in the literature might not be directly comparable as values and depend on the operation conditions.…”

Section: Fundamentals Of Elastocaloric Coolingmentioning

confidence: 98%

Elastocaloric Cooling on the Miniature Scale: A Review on Materials and Device Engineering

Bruederlin

Bumke²,

Chluba³

et al. 2018

Energy Tech

104

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This Review covers the fundamentals of operation and scaling of elastocaloric cooling devices as well as current developments of elastocaloric shape‐memory alloy (SMA) films and the engineering of SMA film‐based cooling devices. Sputter‐deposited TiNiCuCo alloys showing ultra‐low fatigue enable unique functional properties such as tailored transformation temperature gradients. Two substantially different concepts for the development of elastocaloric cooling demonstrators are discussed. One concept relies on heat transfer by mechanical contact between the elastocaloric SMA film and solid heat sink and source elements. The second concept makes use of the heat transfer between the elastocaloric SMA film and a heat transfer fluid, including the advanced technology of active regeneration. Demonstrators based on a single SMA film reach device temperature spans of 14 K and a high specific cooling power of up to 18 W g−1. The performance characteristics are compared with other solid‐state caloric cooling technologies.

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“…It is important to note that the different figures of merit depend on each other. The temperature span Δ T device will depend on the thermal load as well as on cooling power

\dot{Q} \binom{cool}{0}

Section: Fundamentals Of Elastocaloric Coolingmentioning

confidence: 98%

Elastocaloric Cooling on the Miniature Scale: A Review on Materials and Device Engineering

Bruederlin

Bumke²,

Chluba³

et al. 2018

Energy Tech

104

View full text Add to dashboard Cite

show abstract

“… Side view of the schematic mechanical setup for the proposed elastocaloric cooling device. Adapted from Schmidt et al . Used with permission.…”

Section: Current Activities In Spp 1599—from Materials Science To Engimentioning

confidence: 74%

“…One of the disks is inclined and thereby converts the rotary motion to a sinusoidal linear stroke. The cyclic loading and unloading of the SMA elements induce a temperature profile along the circumference of the device . To guide the heat exchange fluid across the SMA elements and achieve a heat exchange between the active material and the medium, the ring of SMA elements moves in a duct consisting of an outer and inner cylinder.…”

Section: Current Activities In Spp 1599—from Materials Science To Engimentioning

confidence: 74%

“…To evaluate the elastocaloric cycles regarding their efficiency, the coefficient of performance COP is introduced . The COP is the quotient of absorbed heat q ab and applied work w as shown in Equation .

true C O P = \frac{q_{a b}}{w}

…”

Section: State‐of‐the‐art Elastocaloric Coolingmentioning

confidence: 99%

“…The strain rate and thermodynamic process control are not the only parameters influencing the process outcome such as temperature change, coefficient of performance, and cooling power. In addition to the strain rate, the influence of maximum strain, thermal boundary condition, various materials, and the elastocaloric cycle itself have been investigated.…”

Section: State‐of‐the‐art Elastocaloric Coolingmentioning

confidence: 99%

See 2 more Smart Citations

NiTi‐Based Elastocaloric Cooling on the Macroscale: From Basic Concepts to Realization

et al. 2018

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Solid‐state cooling is an environmentally friendly, no global warming potential alternative to vapor compression‐based systems. Elastocaloric cooling based on NiTi shape memory alloys exhibits excellent cooling capabilities. Due to the high specific latent heats activated by mechanical loading/unloading, large temperature changes can be generated in the material. The small required work input enables a high coefficient of performance. An overview of elastocaloric cooling from basic principles, such as elastocaloric cooling cycles, material characterization, modeling, and optimization, to the design of elastocaloric cooling devices is presented. Current work performed within the DFG (Deutsche Forschungsgemeinschaft) Priority Program SPP 1599 “Ferroic Cooling”, which is focused on the development and realization of a continuously operating elastocaloric cooling device, is highlighted. The cooling device operates in a rotatory mode with wires under tensile loading. The design allows maximization of cooling power by suitable wire diameter scaling as well as efficiency optimization by implementing a novel drive concept. Finally, computer‐aided design (CAD) models of the discussed solid‐state air cooling device are presented.

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Materials with Giant Mechanocaloric Effects: Cooling by Strength

2016

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The search for materials with large caloric effects has become a major challenge in material science due to their potential in developing near room-temperature solid-state cooling devices, which are both efficient and clean, and that can successfully replace present refrigeration technologies. There are three main families of caloric materials: magnetocaloric, electrocaloric, and mechanocaloric. While magnetocaloric and electrocaloric materials have been studied intensively in the last few decades, mechanocaloric materials are only very recently receiving a great deal of attention. The mechanocaloric effect refers to the reversible thermal response of a solid when subjected to an external mechanical field, and encompasses both the elastocaloric effect, corresponding to a uniaxial force, and the barocaloric effect, which corresponds to the response to hydrostatic pressure. Here, the state of the art in giant mechanocaloric effects is reviewed and a critical analysis of the thermodynamic quantities that characterize the major families of barocaloric and elastocaloric materials is provided. Finally perspectives for further development in this area are given.

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Elastocaloric cooling: From fundamental thermodynamics to solid state air conditioning

Cited by 37 publications

References 33 publications

Elastocaloric Cooling on the Miniature Scale: A Review on Materials and Device Engineering

Elastocaloric Cooling on the Miniature Scale: A Review on Materials and Device Engineering

NiTi‐Based Elastocaloric Cooling on the Macroscale: From Basic Concepts to Realization

Materials with Giant Mechanocaloric Effects: Cooling by Strength

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