Thermodynamic Analysis on the Performance of Barocaloric Refrigeration Systems Using Neopentyl Glycol as the Refrigerant

Dai, Zhaofeng; She, Xiaohui; Wang, Chen; Ding, Yulong; Zhang, Xiaosong; Zhao, Dongliang

doi:10.1007/s11630-023-1801-3

Cited by 8 publications

(2 citation statements)

References 49 publications

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“…Notably, the dT/dp value for cooling is smaller than that for heating, indicating a gradual increase in thermal hysteresis at varying pressures, ranging from 5.7 K at 0 MPa to 12.6 K at 500 MPa. Based on our previous investigations on thermodynamic cycles in barocaloric refrigeration systems, [29] it is essential for a barocaloric refrigeration cycle to exist that the phase change temperature during cooling at high pressure exceeds the phase change temperature during heating at atmospheric pressure. Therefore, utilizing the data presented in Figure 4b, we determined the minimum driving pressure for the composite barocaloric material fabricated in this study to be 67.8 MPa.…”

Section: Colossal Barocaloric Effectmentioning

confidence: 99%

Synergistic Advancement of Molecular Design and Dual Encapsulation Technology for High‐Performance Room‐Temperature Barocaloric Refrigeration Materials

Dai,

Shao,

Chen

et al. 2023

Adv Funct Materials

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Plastic crystal neopentyl glycol (NPG) displays a colossal barocaloric effect akin to conventional refrigerants, rendering it as a highly promising solid‐state refrigerant. However, its practical application is restricted by its elevated phase transition temperature, inferior thermal conductivity, and weak mechanical response. Herein, a molecular design strategy is employed, wherein NPG molecules are substituted with trimethylolpropane (TMP) molecules, resulting in the successful synthesis of novel plastic crystals, designated as NPG0.75TMP0.25, with a phase change temperature of 283.7 K. To enhance the thermal conductivity, a dual encapsulation strategy is utilized to fabricate a highly oriented thermally conductive hybrid network composed of NPG0.75TMP0.25 and expanded graphite (EG) by using melt adsorption and pressure induction. The hybrid networks also significantly augment the mechanical properties of NPG0.75TMP0.25. The resulting composite barocaloric material exhibits a maximum entropy change of 223.8 J K−1 kg−1 achieved under pressure changes below 40 MPa and a thermal conductivity of 18.31 W m−1 K−1. Moreover, the composite exhibits high mechanical response and fatigue resistance. This study not only demonstrates the potential of composite barocaloric materials for practical applications but also significantly advances the engineering of barocaloric refrigeration.

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Section: Colossal Barocaloric Effectmentioning

confidence: 99%

Synergistic Advancement of Molecular Design and Dual Encapsulation Technology for High‐Performance Room‐Temperature Barocaloric Refrigeration Materials

Dai,

Shao,

Chen

et al. 2023

Adv Funct Materials

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“…Furthermore, since supercooling can be explained as a nucleation-driven process, the FOPT temperature is often subject to substantial variability [14,15]. These aspects may limit the efficacy of PCs as BC refrigerants in a working device, where they will need to be cycled continuously and at low pressures [16]. Another important aspect of PCs is the fact that accompanying the FOPT there is a significant change in plasticity of the material, through liberation of orientational degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

Understanding variations of thermal hysteresis in barocaloric plastic crystal neopentyl glycol using correlative microscopy and calorimetry

Rendell-Bhatti,

Boldrin,

Dilshad

et al. 2024

J. Phys. Energy

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Plastic crystals (PCs) exhibit solid-solid order-disorder first-order phase transitions that are accompanied by large correlated thermal and volume changes. These characteristics make PCs promising barocaloric solid-state working bodies for heating and cooling applications. However, understanding the variation of transition temperatures and thermal hysteresis in PCs with cycling is critical if these materials are to replace traditional gaseous refrigerants. Here, for the archetypal barocaloric PC neopentyl glycol (NPG), we correlate microstructure obtained from scanning electron microscopy with local and total thermal changes at the phase transition from infra-red imaging and calorimetry, respectively. We outline an evolution in microstructure as NPG recrystallises during repeated thermal cycling through its solid-solid phase transition. The observed microstructural changes are correlated with spatially inhomogeneous heat transfer, yielding direct insight into the kinetics of the phase transition. Our results suggest that the interplay of these processes affects the undesirable thermal hysteresis and the nature of the kinetic steady-state microstructures that are stabilised during cycling between the ordered and disordered phases. These observations have implications for using NPG and other PCs as technologically relevant barocaloric materials and suggest ways in which the hysteresis in these types of materials may be modified.

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Barocaloric Material with High Thermal Conductivity for Room-Temperature Refrigeration

Zhu,

Dai,

Gao

et al. 2023

J. Therm. Sci.

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Thermodynamic Analysis on the Performance of Barocaloric Refrigeration Systems Using Neopentyl Glycol as the Refrigerant

Cited by 8 publications

References 49 publications

Synergistic Advancement of Molecular Design and Dual Encapsulation Technology for High‐Performance Room‐Temperature Barocaloric Refrigeration Materials

Synergistic Advancement of Molecular Design and Dual Encapsulation Technology for High‐Performance Room‐Temperature Barocaloric Refrigeration Materials

Understanding variations of thermal hysteresis in barocaloric plastic crystal neopentyl glycol using correlative microscopy and calorimetry

Barocaloric Material with High Thermal Conductivity for Room-Temperature Refrigeration

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