Preparation and characterizations of a novel temperature-tuned phase change material based on sodium acetate trihydrate for improved performance of heat pump systems

Li, Minqi; Lin, Zhongqi; Sun, Yongjun; Wu, Fengping; Xu, Tao; Wu, Huijun; Zhou, Xiaoqing; Wang, Dengjia; Liu, Yanfeng

doi:10.1016/j.renene.2020.05.061

Cited by 35 publications

(7 citation statements)

References 19 publications

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“…Also, the temperature profile of the first cycle of our neat sample is slightly lower than that of the rest of the cycles. A similar result has been reported by Li et al as well and it is considered as a normal phenomenon. Moreover, as can be seen in the decay profile, the temperature of the hand warmers through different cycles remains almost the same for about 30 min as that of the onset.…”

Section: Results and Discussionsupporting

confidence: 91%

Storing Solar Energy in Sodium Acetate-Based Hand Warmers Using Light-Absorbing Particles

Kaflé

Devkota

Uprety

et al. 2020

ACS Appl. Energy Mater.

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We have fabricated an eco-friendly, affordable, and recyclable heat-releasing chemical bag (hence forth termed as hand warmers), which melts when exposed to solar radiation and can be suitable for warming the hands and feet of mountain dwellers, hikers, and motorbike/vehicle riders during winter. Our hand warmer uses sodium acetate trihydrate (CH3COONa·3H2O, SAT)-based composites consisting of a suitable photothermal-responsive additive to shorten the melting time of the hand warmer for practical applications. Under simulated solar radiation, activated charcoal powder, graphite powder, graphene flakes, and copper nanoparticles (Cu-NPs) were tested as photothermal-responsive additives, which reduced the melting time of the hand warmer by a factor of 0.68, 0.65, 0.63, and 0.57 respectively, when compared to the sample without any additives. Moreover, the stability of the hand warmer was maintained for two–three months (at which point the samples were deliberately discharged) by incorporating 9 mL of extra water (8% wt) in the SAT composites, which demonstrates the long-term heat storage capacity of the hand warmer.

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Section: Results and Discussionsupporting

confidence: 91%

Storing Solar Energy in Sodium Acetate-Based Hand Warmers Using Light-Absorbing Particles

Kaflé

Devkota

Uprety

et al. 2020

ACS Appl. Energy Mater.

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“…For samples impregnated with the same salt solution, the lower the concentration of the salt solution, the smaller the value of α after impregnation, indicating that the material is relatively hydrophilic. The sample with the largest LiCl content has the highest water vapor adsorption capacity and the largest saturated adsorption capacity at low water pressure, while the addition of LaCl 3 has no obvious improvement compared with the impregnation of MgCl 2 …”

Section: Resultsmentioning

confidence: 99%

“…The sample with the largest LiCl content has the highest water vapor adsorption capacity and the largest saturated adsorption capacity at low water pressure, while the addition of LaCl 3 has no obvious improvement compared with the impregnation of MgCl 2 . 7 3.6. TG Curves of the Samples.…”

Section: N 2 Adsorptionmentioning

confidence: 99%

“…According to the adsorption process, adsorption heat pumps can be divided into three categories: 6 physical adsorption, chemical adsorption, and mixed adsorption. Ammonia, 7 acetone, 8 water vapor, 9 etc., are commonly used adsorbents in adsorption heat pumps. Because water is easily available and harmless, more adsorption heat pump systems choose water vapor as the adsorbate material.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Water Vapor Sorption Performance and Heat Storage of MIL-101 (Cr) Complex MgCl₂, LiCl/LaCl₃ System for Adsorptive Thermal Conversion

Liu,

Wu,

et al. 2023

ACS Omega

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Adsorption heat conversion systems can provide heating and cooling across time and space in a more environmentally friendly way. Porous materials are potential candidates for water-based adsorption thermal conversion, in which a metal–organic framework (MOF) has a larger specific surface area and porosity than other porous matrices. However, many MOFs with high saturated adsorption capacity have great deficiencies in performance at low water vapor partial pressure, which hinder their application in adsorption thermal conversion. To improve the water vapor adsorption performance of MIL-101 (Cr), different contents of magnesium chloride, lithium chloride, and lanthanum chloride are mixed into MIL-101 (Cr) by an impregnation method. The properties and structures of the materials are characterized by XRD, SEM, nitrogen adsorption tests, water vapor adsorption tests, TG, FTIR, and so on. The results show that the saturated water vapor adsorption capacity of the sample impregnated with salt increases by 1.5–2.3 times, up to 2.24 g/g, compared with that of the unimpregnated sample. When the partial pressure of water vapor is 0.3, the adsorption capacity increases by 5.3–7.5 times and reaches 0.68 g/g at most. The maximum heat storage density of impregnated samples can be increased by 866 J/g. Impregnated MgCl2 can greatly improve the adsorption and thermal conversion performance of MOF, and impregnated MgCl2 and the proper amount of LiCl can further improve the performance of the material system. Our experiments show that the composite impregnation of magnesium chloride and the proper amount of lithium chloride can improve the application performance of the MOF materials in the adsorption thermal conversion process.

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“…Wang et al [ 21 ] obtained a PCM with a phase transition temperature of 20~25 °C, which was achieved by adding 0.5% hydroxyethyl cellulose, 5% SrCl 2 ·6H 2 O, and 35% MgCl 2 ·6H 2 O into a solution of CaCl 2 ·6H 2 O. The change in the phase transition temperature of CaCl 2 ·6H 2 O was due to the formation of eutectic salts after adding MgCl 2 ·6H 2 O. Li et al [ 22 ] added urea to a mixed solution of CH 3 COONa·3H 2 O and potassium chloride. According to the characteristic that urea could form a eutectic salt with CH 3 COONa·3H 2 O, a PCM with a phase transition temperature suitable for the heat pump system was obtained.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characteristics of Na2HPO4·12H2O-K2HPO4·3H2O/SiO2 Composite Phase Change Materials for Thermal Energy Storage

Wang

et al. 2022

Materials

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In this paper, a series of eutectic hydrated salts was obtained by mixing Na2HPO4·12H2O (DHPD) with K2HPO4·3H2O (DHPT) in different proportions. With the increase in the content of DHPT, the phase transition temperature and melting enthalpy of eutectic hydrated salts decreased gradually. Moreover, the addition of appropriate deionized water improved the thermal properties of eutectic hydrated salts. Colloidal silicon dioxide (SiO2) was selected as the support carrier to adsorb eutectic hydrated salts, and the maximum content of eutectic hydrated salts in composite PCMs was 70%. When the content of the nucleating agent (Na2SiO3·9H2O) was 5%, the supercooling degree of composite PCMs was reduced to the minimum of 1.2 °C. The SEM and FT-IR test results showed that SiO2 and eutectic hydrated salts were successfully combined, and no new substances were formed. When the content of DHPT was 3%, the phase transition temperature and melting enthalpy of composite PCMs were 26.5 °C and 145.3 J/g, respectively. The results of thermogravimetric analysis and heating–cooling cycling test proved that composite PCMs had good thermal reliability and stability. The application performance of composite PCMs in prefabricated temporary houses was investigated numerically. The results indicated that PCM panels greatly increased the Grade I thermal comfort hours and reduced energy consumption. Overall, the composite PCM has great development potential building energy conservation.

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Preparation and characterizations of a novel temperature-tuned phase change material based on sodium acetate trihydrate for improved performance of heat pump systems

Cited by 35 publications

References 19 publications

Storing Solar Energy in Sodium Acetate-Based Hand Warmers Using Light-Absorbing Particles

Storing Solar Energy in Sodium Acetate-Based Hand Warmers Using Light-Absorbing Particles

Characterization of Water Vapor Sorption Performance and Heat Storage of MIL-101 (Cr) Complex MgCl₂, LiCl/LaCl₃ System for Adsorptive Thermal Conversion

Preparation and Characteristics of Na2HPO4·12H2O-K2HPO4·3H2O/SiO2 Composite Phase Change Materials for Thermal Energy Storage

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Preparation and characterizations of a novel temperature-tuned phase change material based on sodium acetate trihydrate for improved performance of heat pump systems

Cited by 35 publications

References 19 publications

Storing Solar Energy in Sodium Acetate-Based Hand Warmers Using Light-Absorbing Particles

Storing Solar Energy in Sodium Acetate-Based Hand Warmers Using Light-Absorbing Particles

Characterization of Water Vapor Sorption Performance and Heat Storage of MIL-101 (Cr) Complex MgCl2, LiCl/LaCl3 System for Adsorptive Thermal Conversion

Preparation and Characteristics of Na2HPO4·12H2O-K2HPO4·3H2O/SiO2 Composite Phase Change Materials for Thermal Energy Storage

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Characterization of Water Vapor Sorption Performance and Heat Storage of MIL-101 (Cr) Complex MgCl₂, LiCl/LaCl₃ System for Adsorptive Thermal Conversion