Dynamic hygroscopic effect of the composite material used in desiccant rotary wheel

Zhang, X.J.; Sumathy, K.; Dai, Yanjun; Wang, Ruzhu

doi:10.1016/j.solener.2005.07.008

Cited by 45 publications

(9 citation statements)

References 4 publications

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“…Different hygroscopic salts like lithium chloride (LiCl) and calcium chloride (CaCl 2 ) comes under the category of liquid desiccants 2 – 4 . These hygroscopic salts have very high water vapors adsorption capacities, but they have a deliquescence property in which they dissolve in the adsorbed water and form crystalline hydrates 5 , 6 . Therefore, these materials are very difficult to handle and have limited applications.…”

Section: Introductionmentioning

confidence: 99%

Capturing water vapors from atmospheric air using superporous gels

Mittal

Alili

Alhassan

2022

Sci Rep

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Dehumidification performance of most polymer desiccant materials is unsatisfactory because of the complex adsorption mechanism on polymer surface and non-porous structure. A viable alternative of solid desiccants, especially existing polymer desiccants, for capturing water vapors from moist air is the super-porous gels (SPGs). The presence of interconnected channels of pores in its structure facilitates the transfer of water molecules to the internal structure of SPGs. Therefore, in this research work, we are proposing N-isopropylacrylamide (NIPAM) and acrylamide (AM) based thermoresponsive SPGs as a potential alternative to the existing conventional solid desiccants. To ensure the formation of interconnected capillary channels, the SPGs were synthesized via gas blowing and foaming technique. Surface morphology of the SPGs was studied using scanning electron microscopy (SEM) and the other physio-chemical characteristics were studied using different techniques like fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD) and thermo-gravimetric analysis (TGA). Water vapors adsorption properties of the SPGs were explored via adsorption isotherm and kinetics. The adsorption isotherm was found to be of type-III isotherm with a maximum adsorption capacity of 0.75 gw/gads at 25 °C and 90% relative humidity. Experimental isotherm data correlated well with BET, FHH and GAB isotherm models. Adsorption kinetics suggested that the water vapors diffusion followed intraparticle diffusion and liquid field driving mechanisms collectively. SPGs exhibited very good regeneration and reusability for ten continuous adsorption/desorption cycles. Therefore, the dehumidification efficiency of synthesized SPGs shows that they have potential to replace most of the conventional solid desiccant materials in use.

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Section: Introductionmentioning

confidence: 99%

Capturing water vapors from atmospheric air using superporous gels

Mittal

Alili

Alhassan

2022

Sci Rep

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“…This study showed improved adsorption capacity, stability, and longevity due to the formation of Si-O-M (M = promoter element) linkages in the doped silica gel. Similarly, several researchers also enhanced the performance of silica gels by adding promoters such as calcium chloride and other halide complexes [48][49][50]. Photocatalysts for dehumidification of ambient air is another approach employed by few researchers.…”

Section: Dehumidificationmentioning

confidence: 99%

Opportunities for Catalytic Reactions and Materials in Buildings

Cheekatamarla

2021

Encyclopedia

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Residential and commercial buildings are responsible for over 30% of global final energy consumption and accounts for ~40% of annual direct and indirect greenhouse gas emissions. Energy efficient and sustainable technologies are necessary to not only lower the energy footprint but also lower the environmental burden. Many proven and emerging technologies are being pursued to meet the ever-increasing energy demand. Catalytic science has a significant new role to play in helping address sustainable energy challenges, particularly in buildings, compared to transportation and industrial sectors. Thermally driven heat pumps, dehumidification, cogeneration, thermal energy storage, carbon capture and utilization, emissions suppression, waste-to-energy conversion, and corrosion prevention technologies can tap into the advantages of catalytic science in realizing the full potential of such approaches, quickly, efficiently, and reliably. Catalysts can help increase energy conversion efficiency in building related technologies but must utilize low cost, easily available and easy-to-manufacture materials for large scale deployment. This entry presents a comprehensive overview of the impact of each building technology area on energy demand and environmental burden, state-of-the-art of catalytic solutions, research, and development opportunities for catalysis in building technologies, while identifying requirements, opportunities, and challenges.

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“…These adsorption refrigeration systems which use industrial waste heat can also be used as cold sources to reduce fossil fuel consumption in many industrial buildings [5]. At present, the performance coefficient (COP) and specific cooling power (SCP) of the adsorption refrigeration systems are relatively low, which are 0.15-0.6 and 10-100, respectively, and the performance of adsorption refrigeration systems need to be improved [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Composite Adsorbent 13X/CaCl2 on an Adsorption Cooling System

et al. 2017

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Featured Application: The study is mainly used in areas where water is scarce, adsorbents adsorb water from the air, and are then desorbed.Abstract: A new experimental device which tests the adsorption performance of the 13X/CaCl 2 composite adsorbent under vacuum conditions was established. In this device, heat transfer characteristics in the adsorbent bed have a great influence on the adsorbent performance, the temperature of the bottom outside bed is very close to the temperature of the bottom inside bed and the temperature difference between them at the end of heating and cooling are 5.66 • C and 0.303 • C, respectively. The following conclusions could be drawn: the equilibrium water uptake of composite adsorbent CA10X (zeolite 13X impregnated with 10 wt % CaCl 2 solution) was increased 5.7% compared with that of 13X, and the water uptake was 0.37 g/g. The composite adsorbent CA10X has a better performance in the adsorption refrigeration system.

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Dynamic hygroscopic effect of the composite material used in desiccant rotary wheel

Cited by 45 publications

References 4 publications

Capturing water vapors from atmospheric air using superporous gels

Capturing water vapors from atmospheric air using superporous gels

Opportunities for Catalytic Reactions and Materials in Buildings

Experimental Investigations of Composite Adsorbent 13X/CaCl2 on an Adsorption Cooling System

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