Adiabatic temperature change from non-adiabatic measurements

Carvalho, A. Magnus G.; Mejía, C. Salazar; Ponte, C. A.; Silva, L. E. L.; Kaštil, J.; Kamarád, J.; Gomes, A. M.

doi:10.1007/s00339-016-9775-6

Cited by 5 publications

(3 citation statements)

References 16 publications

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“…Figure 2 shows the typical behavior of the temperature during these experiments for the applied pressures of 87(2) and 173(3) MPa at ~ 293 K, where the peak and the valley correspond to the adiabatic compression and decompression steps, respectively. This behavior is found in all i-caloric effects [32][33][34]. 3) MPa.…”

Section: Methodsmentioning

confidence: 54%

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Large barocaloric effects at low pressures in natural rubber

Usuda

Bom

Carvalho

2017

European Polymer Journal

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Barocaloric effect in vulcanized natural rubber (V-NR) has been investigated. Direct measurements of the temperature change ({\Delta}T) around room temperature (283-333 K) resulted in large values, above 10 K, for a pressure change of 173 MPa. A power law was proposed to fit {\Delta}T as function of the maximum pressure, showing to be suitable for the barocaloric effect in V-NR. Strain was measured as a function of temperature at constant pressures in order to obtain the isothermal entropy change ({\Delta}ST). At 293 K, we obtained a {\Delta}ST of 21 J.kg-1K-1 for a pressure change of only 43.4 MPa. The results presented in this work are compared with those reported recently for PVDF-TrFE-CTFE polymer, showing a better barocaloric performance for V-NR in similar temperature and pressure ranges. These findings evidence the high potential of V-NR for application in solid-state refrigeration based on confined compression, opening new possibilities for i-caloric materials.Comment: 15 pages, 6 figures, 1 tabl

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Section: Methodsmentioning

confidence: 54%

“…and 173(3) MPa at ~ 293 K, where the peak and the valley correspond to the adiabatic compression and decompression steps, respectively.This behavior is found in all i-caloric effects[32][33][34].…”

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confidence: 61%

Large barocaloric effects at low pressures in natural rubber

Usuda

Bom

Carvalho

2017

European Polymer Journal

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“…1 (Materials and Methods), the time constant (τ) of the curve after the pressure is released. 41 Fig. 5 shows the time-constant (τ) vs. WTR content for Δp = 173 MPa at T = 273 K. We observe a significant decrease of the time constant (τ) as the WTR content is increased in the samples.…”

Section: Performance Parametersmentioning

confidence: 89%

Waste Tire Rubber-based Refrigerants for Solid-state Cooling Devices

et al. 2020

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Management of discarded tires is a compelling environmental issue worldwide. Although several approaches have been developed to recycle waste tire rubbers, their application in solidstate cooling is still unexplored. Considering the high barocaloric potential verified for elastomers, the use of waste tire rubber (WTR) as refrigerant in solid-state cooling devices is very promising. Here, we investigated the barocaloric effects in WTR and polymer blends made of vulcanized natural rubber (VNR) and WTR, in order to evaluate its feasibility for solid-state cooling technologies. The adiabatic temperature change and the isothermal entropy change reach giant values, as well as the performance parameters, being comparable or even better than most barocaloric materials in literature. Moreover, pure WTR and WTR-based samples also present a faster thermal exchange than VNR, consisting in an additional advantage of using these discarded materials. Thus, the present findings evidence the encouraging perspectives of employing waste rubbers in solid-state cooling based on barocaloric effect, contributing in both the recycling of polymers and the sustainable energy technology field.

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