Numerical modeling of an active elastocaloric regenerator refrigerator with phase transformation kinetics and the matching principle for materials selection

Qian, Suxin; Li, Yuan; Yu, Jianlin; Yan, Gang

doi:10.1016/j.energy.2017.09.116

Cited by 71 publications

(22 citation statements)

References 41 publications

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“…In practical application, if not properly designed, many factors would lead to the significant degradation of caloric effect and overall performance, such as operating frequency, flow rate, geometric parameters, and thermal conductivity . For ferroelectric materials, the influence of applied electric field frequency on ECE calculation has been reported by several researchers, and it is controversial based on the results reported in the literature .…”

Section: Introductionmentioning

confidence: 99%

Indirect Electrocaloric Evaluation: Influence of Polarization Hysteresis Measurement Frequency

Cheng

Weyland

Novak

et al. 2019

Physica Status Solidi (a)

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This study investigates the influence of applied electric field frequency for polarization-electric field (P-E) loops on indirect electrocaloric evaluation. Soft lead zirconate titanate (PZT) ceramic is used as a model material. The P-E loops under 1 and 100 Hz are presented at various temperatures with an electric field amplitude of 2.5 MV m À1 . The indirect method based on the Maxwell relations is used to calculate the electrocaloric response. The result demonstrates that the electrocaloric responses based on the P-E loops measured at 1 Hz agree well with direct measurement results in the literature, but at 100 Hz, the coexistence of positive and negative electrocaloric effects (ECEs) is obtained, which has not been reported before. Domain switching is a dynamic process and rate-dependent, which has a significant influence on the polarization behavior and the subsequent electrocaloric performance of ferroelectric materials. The result also shows that during the indirect ECE evaluation, high attention needs to be paid to the applied electric field frequency to obtain accurate and comparable electrocaloric evaluations in ferroelectric materials.

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Section: Introductionmentioning

confidence: 99%

Indirect Electrocaloric Evaluation: Influence of Polarization Hysteresis Measurement Frequency

Cheng

Weyland

Novak

et al. 2019

Physica Status Solidi (a)

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“…In this case, a lumped representation of the SMA behavior is sufficient that reflects, instead of the local, the global transformation behavior with the associated deduced properties. On this topic, different approaches are known from the literature . In these, the simulative investigation of different parameters and aspects of the elastocaloric device based on compressed SMA tubes are described.…”

Section: State‐of‐the‐art Elastocaloric Coolingmentioning

confidence: 74%

“…On the macroscopic device level, the model must represent the interaction and behavior of the multiple individual single components.I nt his case,alumped representation of the SMA behavior is sufficient that reflects,i nstead of the local, the global transformation behavior with the associated deduced properties.O nt his topic, different approaches are known from the literature. [109][110][111] In these,t he simulative investigation of different parameters and aspects of the elastocaloric device based on compressed SMA tubes are described. To enable an economic developmentofanoptimized cooling device,t he model needs to quantitatively andq ualitatively predict the coolinge fficiency and cooling powero f the device.T oe nable the possibility of parameter studies in the simulation and thus reducing cost and time intensive experiments,a na cceptable computation time of the simulation is needed.…”

Section: Cooling Devicementioning

confidence: 99%

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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“…It was indicated that 50 segments in length of SMA bed is efficient for most of the simulated cases from a previous study (Qian et al 2017a). In Eqs.…”

Section: Referencementioning

confidence: 87%

Accurate prediction of work and coefficient of performance of elastocaloric materials with phase transformation kinetics

Qian

Hou

et al. 2018

Science and Technology for the Built Environment

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Elastocaloric cooling is a novel solid-state cooling technology based on the latent heat associated with martensitic phase transformation in shape memory alloys. The work associated with elastocaloric cooling cycle is determined based on the material physical properties as well as the operating temperatures. To predict the work accurately under common practical conditions, a 1-D dynamic model for the shape memory alloys with phase transformation kinetics for polycrystalline is developed in this study. The model is discretized and then implemented in MATLAB Simulink. Based on the physics of the phase transformation free energy, the model is capable to predict whether or not the local material would undergo transformation under the given stress and temperature condition. To validate the model, series of compressive loading-unloading tests for super-elastic Ni-Ti alloys were conducted under different temperatures. The test results and data from literature were compared to the model prediction, and the deviation is within 10%. The cycle work and coefficient of performance is demonstrated for a two-bed active elastocaloric regenerator system as an example and then compared with the conventional single-stage system.

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Numerical modeling of an active elastocaloric regenerator refrigerator with phase transformation kinetics and the matching principle for materials selection

Cited by 71 publications

References 41 publications

Indirect Electrocaloric Evaluation: Influence of Polarization Hysteresis Measurement Frequency

Indirect Electrocaloric Evaluation: Influence of Polarization Hysteresis Measurement Frequency

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

Accurate prediction of work and coefficient of performance of elastocaloric materials with phase transformation kinetics

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