High energy-density and power-density thermal storage prototype with hydrated salt for hot water and space heating

Li, T.X.; Xu, Jiaxing; Wu, Dengke; He, Fan; Wang, R.Z.

doi:10.1016/j.apenergy.2019.04.114

Cited by 61 publications

(15 citation statements)

References 20 publications

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“…Energies 2020, 13, x FOR PEER REVIEW 20 of 23 system was similar for all three flow rates, this is in agreement with the findings reported in the literature for several other thermal storage geometries [24,33,35,37,38]. In stage (II), during which RT62HC has a stable temperature, a distinct temperature plateau can be seen, indicating the mushy phase change process, in which, the rate of heat exchange between the PCM and HTF is determined by the combined effects of natural-convection thermal conduction heat transfer [35].…”

Section: Zonal Temperature Evaluation During the Discharging Processsupporting

confidence: 91%

“…With natural convection not playing any significant role during the discharging process and conduction being the heat transfer mechanism determining overall heat transfer rate, it is clear that the HTF volume flow rate does not significantly change the total solidification times as heat transfer is limited by the thermal resistance of the solid PCM layer that forms on the outside the copper pipe. Due to the reduced rates of heat transfer that the solidification of PCM causes the difference between the inlet and outlet HTF temperature decreased and the amount of the energy recovered from the system was similar for all three flow rates, this is in agreement with the findings reported in the literature for several other thermal storage geometries [24,33,35,37,38].…”

Section: Zonal Temperature Evaluation During the Discharging Processsupporting

confidence: 91%

See 1 more Smart Citation

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

Fadl

Eames

2020

Energies

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In this study, the thermal performance of latent heat thermal energy storage system (LHTESS) prototype to be used in a range of thermal systems (e.g., solar water heating systems, space heating/domestic hot water applications) is designed, fabricated, and experimentally investigated. The thermal store comprised a novel horizontally oriented multitube heat exchanger in a rectangular tank (forming the shell) filled with 37.8 kg of phase change material (PCM) RT62HC with water as the working fluid. The assessment of thermal performance during charging (melting) and discharging (solidification) was conducted under controlled several operational conditions comprising the heat transfer fluid (HTF) volume flow rates and inlet temperatures. The experimental investigations reported are focused on evaluating the transient PCM average temperature distribution at different heights within the storage unit, charging/discharging time, instantaneous transient charging/discharging power, and the total cumulative thermal energy stored/released. From the experimental results, it is noticed that both melting/solidification time significantly decreased with increase HTF volume flow rate and that changing the HTF inlet temperature shows large impacts on charging time compared to changing the HTF volume flow rate. During the discharging process, the maximum power output was initially 4.48 kW for HTF volume flow rate of 1.7 L/min, decreasing to 1.0 kW after 52.3 min with 2.67 kWh of heat delivered. Based on application heat demand characteristics, required power levels and heat demand can be fulfilled by employing several stores in parallel or series.

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Section: Zonal Temperature Evaluation During the Discharging Processsupporting

confidence: 91%

Section: Zonal Temperature Evaluation During the Discharging Processsupporting

confidence: 91%

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

Fadl

Eames

2020

Energies

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“…A tailorable operation temperature favors different applications fitting specific requirements; for example, hot water supply requires higher working temperatures (40–80 °C) 6 , 49 , 50 compared with that of indoor temperature-regulation in buildings (19–25 °C). 49 , 51 An increased CNF content, from 15 to 25 wt % in the PCN, generally results in a reduction of fusion temperature. For instance, the T m values for PCN prepared with PEG4000 (C-compositions) are reduced from 62.4 to 57.4 °C.…”

Section: Resultsmentioning

confidence: 99%

Cellulose Nanofibrils Endow Phase-Change Polyethylene Glycol with Form Control and Solid-to-gel Transition for Thermal Energy Storage

Yazdani

Ajdary

Kankkunen

et al. 2021

ACS Appl. Mater. Interfaces

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Green energy-storage materials enable the sustainable use of renewable energy and waste heat. As such, a form-stable phase-change nanohybrid (PCN) is demonstrated to solve the fluidity and leakage issues typical of phase-change materials (PCMs). Here, we introduce the advantage of solid-to-gel transition to overcome the drawbacks of typical solid-to-liquid counterparts in applications related to thermal energy storage and regulation. Polyethylene glycol (PEG) is form-stabilized with cellulose nanofibrils (CNFs) through surface interactions. The cellulosic nanofibrillar matrix is shown to act as an organogelator of highly loaded PEG melt (85 wt %) while ensuring the absence of leakage. CNFs also preserve the physical structure of the PCM and facilitate handling above its fusion temperature. The porous CNF scaffold, its crystalline structure, and the ability to hold PEG in the PCN are characterized by optical and scanning electron imaging, infrared spectroscopy, and X-ray diffraction. By the selection of the PEG molecular mass, the lightweight PCN provides a tailorable fusion temperature in the range between 18 and 65 °C for a latent heat storage of up to 146 J/g. The proposed PCN shows remarkable repeatability in latent heat storage after 100 heating/cooling cycles as assessed by differential scanning calorimetry. The thermal regulation and light-to-heat conversion of the PCN are confirmed via infrared thermal imaging under simulated sunlight and in a thermal chamber, outperforming those of a reference, commercial insulation material. Our PCN is easily processed as a structurally stable design, including three-dimensional, two-dimensional (films), and one-dimensional (filaments) materials; they are, respectively, synthesized by direct ink writing, casting/molding, and wet spinning. We demonstrate the prospects of the lightweight, green nanohybrid for smart-energy buildings and waste heat-generating electronics for thermal energy storage and management.

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“…67 As a lower thermal conductivity will reduce the energy charging/discharging rate, thereby further reducing the energy storage efficiency of the material, the high thermal conductivity of the TRL makes the temperature distribution of window more uniform and provides the window with higher energy storage efficiency. [67][68][69] Moreover, the TRL has a viscosity that comparable to water (TRL: 1.80 cP, water: 1.05 cP); which provides its capability of easy fabrication.…”

Section: Optical and Thermal Properties Of The Trlmentioning

confidence: 99%

Liquid Thermo-Responsive Smart Window Derived from Hydrogel

Zhou

Wang

Peng

et al. 2020

Joule

260

162

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High energy-density and power-density thermal storage prototype with hydrated salt for hot water and space heating

Cited by 61 publications

References 20 publications

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

Thermal Performance Analysis of the Charging/Discharging Process of a Shell and Horizontally Oriented Multi-Tube Latent Heat Storage System

Cellulose Nanofibrils Endow Phase-Change Polyethylene Glycol with Form Control and Solid-to-gel Transition for Thermal Energy Storage

Liquid Thermo-Responsive Smart Window Derived from Hydrogel

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