Study of solar regenerated membrane desiccant system to control humidity and decrease energy consumption in office spaces

Keniar, Khoudor; Ghali, Kamel; Ghaddar, Nesreen

doi:10.1016/j.apenergy.2014.10.071

Cited by 81 publications

(16 citation statements)

References 42 publications

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“…The use of membrane contactors in liquid desiccant based dehumidification systems has been evaluated by a number of authors [5,[27][28][29][30][31][32]. Membrane contactor based dehumidification is attractive because it separates the desiccant and air streams by use of a porous membrane surface, effectively eliminating any chance for droplet carryover of desiccant solution into the airstream.…”

Section: Membrane Dehumidificationmentioning

confidence: 99%

Triple-bore hollow fiber membrane contactor for liquid desiccant based air dehumidification

Bettahalli

Lefers

Fedoroff

et al. 2016

Journal of Membrane Science

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a b s t r a c tDehumidification is responsible for a large part of the energy consumption in cooling systems in high humidity environments worldwide. Improving efficiency is therefore essential. Liquid desiccants offer a promising solution for dehumidification, as desired levels of humidity removal could be easily regulated. The use of membrane contactors in combination with liquid desiccant is attractive for dehumidification because they prevent direct contact between the humid air and the desiccant, removing both the potential for desiccant carryover to the air and the potential for contamination of the liquid desiccant by dust and other airborne materials, as well as minimizing corrosion. However, the expected additional mass transport barrier of the membrane surface can lower the expected desiccation rate per unit of desiccant surface area. In this context, hollow fiber membranes present an attractive option for membrane liquid desiccant contactors because of their high surface area per unit volume. We demonstrate in this work the performance of polyvinylidene fluoride (PVDF) based triple-bore hollow fiber membranes as liquid desiccant contactors, which are permeable to water vapor but impermeable to liquid water, for dehumidification of hot and humid air.

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Section: Membrane Dehumidificationmentioning

confidence: 99%

Triple-bore hollow fiber membrane contactor for liquid desiccant based air dehumidification

Bettahalli

Lefers

Fedoroff

et al. 2016

Journal of Membrane Science

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“…As it relates to the regeneration of liquid desiccant solutions, multiple types of regeneration have been proposed. However, the best candidates for fresh water recovery that have both energy efficiency and a compact design are processes typically used in seawater desalination, including electrodialysis [26][27][28], reverse osmosis [29], and membrane distillation [16][17][18][19][20][21][22]. The use of membrane contactors with inorganic salt solutions has been used for a number of processes, including but not limited to dehumidification, forward osmosis, and water treatment [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38].…”

Section: Solution Regenerationmentioning

confidence: 99%

Vacuum membrane distillation of liquid desiccants utilizing hollow fiber membranes

Lefers

Bettahalli

Fedoroff

et al. 2018

Separation and Purification Technology

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This paper documents the testing of a vacuum membrane distillation system intended for use with liquid desiccants. Liquid desiccants offer the possibility for low-energy, ambient temperature dehumidification. Effective desalination and purification of diluted desiccants outputs two important products: a concentrated desiccant for reuse in dehumidification and fresh water. In this study, vacuum membrane distillation was used in the laboratory to purify diluted liquid desiccants. Calcium chloride and magnesium chloride were the desiccants selected for testing. Desiccant solutions were pumped through the lumens of poly(vinylidene fluoride) (PVDF) hollow fiber membranes at varying feed inlet temperatures, solution velocity rates and vacuum set points during membrane distillation. An average flux of 8 kg m-2 h-1 was obtained using 30 wt% magnesium chloride solution at a temperature of 50 °C while applying vacuum to achieve 25 mbar absolute pressure on the air side of the membrane. The results are promising for the development of a full-scale vacuum membrane distillation process for desiccant solution regeneration and fresh water recovery. In addition, the recovered condensate was of sufficient quality for use in agricultural irrigation or drinking water.

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“…The indoor space is conditioned by 100% fresh air. Deep seawater at 17 °C is used as a heat sink to lower inlet air temperature to 18 °C . For summer days in Beirut, the dew point temperature of the ambient air is higher than 18 °C (Table ).…”

Section: Resultsmentioning

confidence: 99%

Moisture buffering capacity of novel solar-regenerated rotating hygroscopic curtain system

Salloum

Ghali

Ghaddar

2015

Int. J. Energy Res.

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This study proposes a rotating hygroscopic curtain to control indoor relative humidity. The curtain continuously exchanges heat and moisture with the two environments: the internal space where the curtain undergoes absorption and the space between curtain and glass window where it undergoes desorption releasing the collected space moisture to the exhausted airstream. In this work, a theoretical model is developed for the curtain system with an integrated indoor space modal to study the rotating hygroscopic curtain feasibility in performing indoor dehumidification. An experimental setup was built inside climatic chambers for validating the model predictions of room air temperature and moisture removal rate. Experimental data of the curtain-absorbed moisture and the chamber indoor humidity showed good comparison with the model simulation values. A case study was evaluated to predict the effectiveness of a highly moisture-absorbing cotton curtain used inside an office in Beirut City having an area of 42 m 2 . At a given load, the hygroscopic curtain maintained an average relative humidity of about 65.7% when rotating continuously at a speed of 1.5 rpm compared with a value of 71.1% when the curtain was stationary.

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Study of solar regenerated membrane desiccant system to control humidity and decrease energy consumption in office spaces

Cited by 81 publications

References 42 publications

Triple-bore hollow fiber membrane contactor for liquid desiccant based air dehumidification

Triple-bore hollow fiber membrane contactor for liquid desiccant based air dehumidification

Vacuum membrane distillation of liquid desiccants utilizing hollow fiber membranes

Moisture buffering capacity of novel solar-regenerated rotating hygroscopic curtain system

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