A composite material made of mesoporous siliceous shale impregnated with lithium chloride for an open sorption thermal energy storage system

Liu, Hongzhi; Nagano, Katsunori; Togawa, Junya

doi:10.1016/j.solener.2014.10.044

Cited by 62 publications

(23 citation statements)

References 30 publications

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“…It has been confirmed that the composite material made by impregnating chloride into the mesopores of WSS is stable because of WSS's crystallized structure [29,32]. The composite material made by impregnating LiCl into the mesopores of WSS has shown high stability with lower regeneration temperature when compared with the composite material made by impregnating CaCl 2 into WSS [22]. The physical properties, including pore size distribution and pore volume; sorption properties, such as water sorption isosters and sorption isotherms; and thermal properties of specific heat capacity and activation energy of the composite material WSS + LiCl were also tested in the research work reported in Jiang et al [25].…”

Section: Methodsmentioning

confidence: 91%

“…% chloride is impregnated into the pores [21], making it inappropriate for long-term use. Therefore, a new composite with high stability was developed by impregnating LiCl into pores of mesoporous WSS [22]. LiCl is usually used as the liquid desiccant [23][24][25] or liquid absorption chiller [26,27]; its higher exergetic efficiency and long-term stability [28] is thought to be suitable as the other main component of the composite sorbent for a sorption chiller.…”

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confidence: 99%

“…The coated heat exchanger was left open to the air for 24 h for air drying, before being heated at 120 • C (the temperature was chosen according to the result obtained in Figure 9 in Liu et al [22]) for 24 h to get its dry weight.…”

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confidence: 99%

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Performance of LiCl Impregnated Mesoporous Material Coating over Corrugated Heat Exchangers in a Solid Sorption Chiller

2018

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The composite material made by impregnating 40 wt. % lithium chloride (LiCl) into the mesopores of a kind of natural porous rock (Wakkanai Siliceous Shale: WSS) micropowders (short for "WSS + 40 wt. % LiCl") had been developed previously, and can be regenerated below 100 • C with a cooling coefficient of performance (COP) of approximately 0.3 when adopted as a sorbent in a sorption cooler. In this study, experiments have been carried out on an intermittent solid sorption chiller with the WSS + 40 wt. % LiCl coating over two aluminum corrugated heat exchangers. Based on the experimental condition (regeneration temperature of 80 • C, condensation temperature of 30 • C in the desorption process; sorption temperature of 30 • C and evaporation temperature of 12 • C in the sorption process), the water sorption amount changes from 20 wt. % to 70 wt. % in one sorption cooling cycle. Moreover, a specific cooling power (SCP) of 86 W/kg, a volumetric specific cooling power (VSCP) of 42 W/dm 3 , and a specific sorption power of 170 W/kg can be achieved with a total sorption and desorption time of 20 min. The obtained cooling COP is approximately 0.16.Energies 2018, 11, 1565 2 of 15 the condenser to release heat. For the opposite process, cooling energy can be obtained in an evaporator because of water evaporation, and the evaporated water vapor binds to the sorbent during the sorption process [15]. Several novel porous solids with water as refrigerant are being researched in sorption heating and cooling systems: silica gel, FAM-01 and FAM-02 developed by Mitsubishi Plastics Ltd. (Tokyo, Japan), metal-organic frameworks (MOFs), and various composite sorbents [16]. Among these sorbents, composite sorbents are considered to be promising to enhance the efficiency of the sorption cooling and heating system by means of a target-oriented design of the sorbent specified for a particular cycle. Composites with two components can offer the opportunity for nano-tailoring the sorption properties by varying the confined salt chemical nature and content, porous structure of host matrix, and synthesis conditions [16,17].Two basic configurations for the composite sorbents-water working pairs were described in the literatures; namely, (1) packed bed sorbent contacting with the heat transfer surface, and (2) sorbent coating on the heat exchanger surface. For the packed bed sorbent cooling systems, Restuccia et al. [6,18] developed an adsorptive cooling system with packed SWS-1L (mesoporous silica gel impregnated with CaCl 2 ) inside a high-efficiency heat exchanger. A mean SCP of 20-40 W/kg of adsorbent and a cooling COP of 0.4-0.6 were obtained when the T re was 95 • C, T con was 35 • C, and T ev was 10 • C. Freni et al. [19] tested the performance of a packed bed sorption chiller using SWS-8L (silica modified by Ca(NO 3 ) 2 ). At the operation condition of T ev = 15 • C, T con = 30 • C, and T re = 90-95 • C, the cooling COP increased from 0.28 to 0.41, while the SCP decreased from 389 W/kg to 190 W/kg when the cycle time changed from 8 min ...

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Section: Methodsmentioning

confidence: 91%

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confidence: 99%

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Performance of LiCl Impregnated Mesoporous Material Coating over Corrugated Heat Exchangers in a Solid Sorption Chiller

2018

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“…[71] used as a host porous matrix another cheap mineral material, that was a Wakkanai siliceous shale (WSS). The WSS is a type of siliceous mudstone that is widely distributed in Wakkanai, the northern part of Hokkaido (Japan).…”

Section: Adsorptive Inter-seasonal Heat Storagementioning

confidence: 99%

Current progress in adsorption technologies for low-energy buildings

Aristov

2015

Future Cities and Environment

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More than half of the world's population currently lives in cities. An essential constituent of future sustainable cities is energy efficient and ecologically sound buildings which ensure high levels of comfort and convenience without reducing the standards of living. At present, a significant part of primary fossil fuels is spent for heating/cooling of buildings, thus, greatly contributing to total GHG emissions. In this paper, typical heat losses in dwellings are considered taking the United Kingdom and the Russian Federation as examples. The role of adsorption-based technologies for more rational use of heat in buildings is discussed. Fundamentals of inter-seasonal adsorptive heat storage (AHS) are briefly considered. A tentative upper limit of the AHS storage density is estimated. Current practice of inter-seasonal AHS and novel smart adsorbents promising for this emerging technology are overviewed. Since a portion of the heat losses in ventilation system significantly increases in modern buildings, a new approach to regenerating heat and moisture in this system is discussed. Finally, optimization trends of the AHS in buildings are briefly considered.

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“…Increasing studies [2][3][4][5][6][7] have adopted water as sorbate for its safety and low price. Water sorption materials can be generally divided into three types: physical sorbents such as silica gel and zeolite; chemical sorbents represented by LiCl and MgCl 2 ; and composite sorbents, also called "salt inside porous matrix (CSPM)".…”

Section: Introductionmentioning

confidence: 99%

Thermochemical Characterizations of Novel Vermiculite-LiCl Composite Sorbents for Low-Temperature Heat Storage

Zhang

Wang

et al. 2016

Energies

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Abstract:To store low-temperature heat below 100 • C, novel composite sorbents were developed by impregnating LiCl into expanded vermiculite (EVM) in this study. Five kinds of composite sorbents were prepared using different salt concentrations, and the optimal sorbent for application was selected by comparing both the sorption characteristics and energy storage density. Textural properties of composite sorbents were obtained by extreme-resolution field emission scanning electron microscopy (ER-SEM) and an automatic mercury porosimeter. After excluding two composite sorbents which would possibly exhibit solution leakage in practical thermal energy storage (TES) system, thermochemical characterizations were implemented through simulative sorption experiments at 30 • C and 60% RH. Analyses of thermogravimetric analysis/differential scanning calorimetry (TGA/DSC) curves indicate that water uptake of EVM/LiCl composite sorbents is divided into three parts: physical adsorption of EVM, chemical adsorption of LiCl crystal, and liquid-gas absorption of LiCl solution. Energy storage potential was evaluated by theoretical calculation based on TGA/DSC curves. Overall, EVMLiCl20 was selected as the optimal composite sorbent with water uptake of 1.41 g/g, mass energy storage density of 1.21 kWh/kg, and volume energy storage density of 171.61 kWh/m 3 .

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A composite material made of mesoporous siliceous shale impregnated with lithium chloride for an open sorption thermal energy storage system

Cited by 62 publications

References 30 publications

Performance of LiCl Impregnated Mesoporous Material Coating over Corrugated Heat Exchangers in a Solid Sorption Chiller

Performance of LiCl Impregnated Mesoporous Material Coating over Corrugated Heat Exchangers in a Solid Sorption Chiller

Current progress in adsorption technologies for low-energy buildings

Thermochemical Characterizations of Novel Vermiculite-LiCl Composite Sorbents for Low-Temperature Heat Storage

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