Experimental study on the direct/indirect contact energy storage container in mobilized thermal energy system (M-TES)

Wang, Weilong; Guo, Shu-Guang; Li, Hailong; Yan, Jinyue; Zhao, Jianlin; Li, Xun; Ding, Jing

doi:10.1016/j.apenergy.2013.12.058

Cited by 92 publications

(29 citation statements)

References 19 publications

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“…It was suggested that this was due to larger droplets forming at high flow rates, as well as liquid portions being trapped by solid PCM, reducing the contact heat transfer area. Wang et al [10] compared a direct contact thermal storage system with a conventional coil-in-tank PCM storage system where the heat transfer fluid, being heating oil, flows through the coil. Measurements identified the direct system achieved higher heat transfer rates over the phase change process.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

2015

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Section: Introductionmentioning

confidence: 99%

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

2015

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“…Previous studies have described and discussed, among other things, the melting and crystallization behaviors of PCMs. This publication supports our finding that the middle section melts first.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, a piping system for the HTF separates it from the PCM. Compared with indirect heat transfer, direct heat transfer offers the following advantages: Higher charging and discharging rates due to improved heat transfer between the PCM and the HTF Higher storage density, since there is no piping system in the storage tank Extended period of high transfer rate during charge because solidified PCM with low thermal conductivity around the piping system does not screen the heat transfer …”

Section: Introductionmentioning

confidence: 99%

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Channel formation and visualization of melting and crystallization behaviors in direct‐contact latent heat storage systems

et al. 2020

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Summary Thermal storage systems are an essential component for increasing the share of renewable energies in residential heating and for the valorization of waste heat. A key challenge for the widespread application of thermal storage systems is their limited power‐to‐capacity ratio. One potential solution for this challenge is represented by direct‐contact latent heat storage systems, in which a phase change material (PCM) is in direct contact with an immiscible heat transfer fluid (HTF). To demonstrate the applicability of the direct‐contact concept for domestic hot water production, a PCM with a phase change temperature of 59°C is chosen. To enable cost‐efficient implementation of the storage system, a eutectic mixture of two salt hydrates, magnesium chloride hexahydrate and magnesium nitrate hexahydrate, is chosen as the PCM. One key aspect for the direct‐contact concept is that, during discharge, the HTF channels in the PCM do not become clogged during the solidification of the PCM. In this study, the formation and topology of the channels in direct‐contact systems under an optimized flow condition are investigated via visual observation and X‐ray computed tomography. The elucidation of the channel structure provides information on the melting and crystallization behaviors of the PCM, which are shown schematically.

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“…[7] A number of district heating (DH) systems in Sweden accept industrial excess heat as a part of their fuel mix and in 2011 excess heat accounted for 7.2% of the heat deliveries in the Swedish DH networks [8; 9]. Several research studies investigate excess heat recovery (both thermal applications and heat driven electricity generation) and heat storage technologies [10][11][12][13][14][15][16][17][18]. Johansson and Söderström [13] compare and evaluate heat driven electricity generation technologies for recovery of low-temperature industrial excess heat based on heat source temperature, efficiency, capacity, economy and potential electricity production.…”

Section: Introductionmentioning

confidence: 99%

Industrial excess heat use: Systems analysis and CO2 emissions reduction

Viklund¹,

Karlsson²

2015

Applied Energy

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The adopted energy efficiency directive stresses the use of excess heat as a way to reach the EU target of primary energy use. Use of industrial excess heat may result in decreased energy demand, CO2 emissions reduction, and economic gains. In this study, an energy systems analysis is performed with the aim of investigating how excess heat should be used, and the impact on CO2 emissions. The manner in which the heat is recovered will affect the system. The influence of excess heat recovery and the trade-off between heat recovery for heating or cooling applications and electricity production has been investigated using the energy systems modeling tool reMIND. The model has been optimized by minimizing the system cost. The results show that it is favorable to recover the available excess heat in all the investigated energy market scenarios, and that heat driven electricity production is not a part of the optimal solution. The trade-off between use of recovered excess heat in the heating or cooling system depends on the energy market prices and the type of heat production. The introduction of excess heat reduces the CO2 emissions in the system for all the studied energy market scenarios.

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Experimental study on the direct/indirect contact energy storage container in mobilized thermal energy system (M-TES)

Cited by 92 publications

References 19 publications

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

Effectiveness of direct contact PCM thermal storage with a gas as the heat transfer fluid

Channel formation and visualization of melting and crystallization behaviors in direct‐contact latent heat storage systems

Industrial excess heat use: Systems analysis and CO2 emissions reduction

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