A review of correlations and enhancement approaches for heat and mass transfer in liquid desiccant dehumidification system

Wen, Tao; Lu, Lin

doi:10.1016/j.apenergy.2019.01.245

Cited by 71 publications

(17 citation statements)

References 148 publications

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“…The same phenomenon is also applied to Eq. (14), as the transferred flux also increases following the same path [37]. According to Table 3, the overall results indicate that in all the membranes evaluated in this study, increasing the Fig.…”

Section: Effects Of Humidity and Temperaturesupporting

confidence: 60%

Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

Jafarpour

Fazelpour

Mousavi

2019

Int J Energy Environ Eng

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In this study an experimental design was developed to optimize the performance and structure of a membrane-based parallelplate liquid desiccant dehumidifier used in air conditioning regeneration system which operates under high humidity weather conditions. We conducted a series of polymeric porous membranes with different compositions fabricated that were prepared with various weight percentages of polysulfone (PSU), mixed with N-methyl-2-pyrrolidone (NMP) and dimethyl form amide (DMF) solvents. Furthermore, the designed experiments were performed under various operating conditions, indicating that the dehumidification efficiency declines with increasing flow rate, temperature, and humidity. Consequently, a membrane with optimized porosity and moisture permeability was selected which resulted in eliminating the carryover of solution droplets in the air, largely due to separating the flow condition of liquid desiccant (Li Cl) and air. This specific design is also greatly benefited by removing the water vapor from the air stream. The results of mathematical model simulations indicate that the DMF solvent had higher dehumidification capability compared with that of NMP under the optimized operating conditions. Additionally, it can clarify the porosity of the membrane which plays a significant role in the overall performance. Therefore, the fabricated membrane produces fresh cool air, and it can be applied as a guiding sample for designing the membrane-based dehumidifier with improved performance.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Effects Of Humidity and Temperaturesupporting

confidence: 60%

Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

Jafarpour

Fazelpour

Mousavi

2019

Int J Energy Environ Eng

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“…These nanoparticles could be added in suspension to the liquid desiccant solution with a resulting increase in the mass transfer process, which could further enhance the removal of viruses or pathogens from the air. Various studies are reported in the literature on the addition of surfactants and nanoparticles to increase the heat and mass transfer performance of desiccant systems [187][188][189][190][191]. Abu-Hamdeh and Almitani studied the addition of ZnO, Fe3O4, and Al2O3 nanoparticles to water to increase the performance of an evaporative cooling system used in combination with liquid desiccant technology [192].…”

Section: Potential Scrubbing Technology: Liquid Desiccant 51mentioning

confidence: 99%

An overview of solutions for airborne viral transmission reduction related to HVAC systems including liquid desiccant air-scrubbing

Giampieri¹,

Ling‐Chin²,

Ma³

et al. 2021

Preprint

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The world is facing on-going challenges due to the spread of the coronavirus SARS-CoV-2, which is affecting the health of people worldwide and the economy of countries. Social distancing, lockdown and quarantine measures have been implemented globally to limit the spread of the virus with a profound impact on people’s lives. These are interventions which are not considered to be permanent and reproducible in the long-term. As more evidence is growing around the airborne transmission routes of the virus, as previously identified for other viruses such as tuberculosis, measles, influenza and coronaviruses, the role of heating, ventilation and air-conditioning (HVAC) systems in buildings, enclosed spaces and public transport in limiting the transmission of airborne pathogens has become a topic of significant relevance. Although the HVAC strategies recommended by professional engineering associations are capable of minimising the transmission of airborne pathogens, they are also responsible for an increase in energy consumption and possibly in a reduction of thermal comfort for occupants. The objective of the study is to review the role of HVAC in airborne viral transmission, to estimate the energy penalty associated with the implementation of the main HVAC strategies for transmission reduction and understand the potential of liquid desiccant technology as an air scrubber. That is capable to a) energy-efficiently control temperature and humidity in buildings, enclosed spaces and public transport; b) increase the indoor air quality by offering the conditions of temperature and humidity less favourable to the growth, proliferation and infectivity of microorganisms; and c) inactivate pathogens. The main factors involved in the process of the inactivation of viruses or pathogens by liquid desiccant solutions are also described together with possible modifications to the solutions to increase their heat and mass transfer and sanitising characteristics. The study is ended by an economic evaluation of the potential energy benefits resulting from the use of liquid desiccant technology. It is concluded that the technology could be particularly favourable in those buildings where humidity control and/or moisture removal is required or in buildings where viruses are more likely to be present, such as in healthcare facilities/operating rooms, or in the event of an airborne viral outbreak.

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“…Different studies have been carried out on LDACs and they are found to have deepened the understanding of the LDACs' potential, limitation, and parametric correlations. [25][26][27][28] To justify any discrepancies between analytical, numerical, and experimental investigation outcomes, Bai et al 29 comparatively revised allowable errors between experimental investigations and the analytical results using data in published literature. Also, the empirical correlations from different researchers toward performance influential parameters of LDACs were reviewed by Wen et al 27 Gómez et al 30 distinguished between direct and indirect solar thermal regenerator in LDACs, where potassium formate and IL were tested in a solar thermal desiccant regeneration equipment.…”

Section: Introductionmentioning

confidence: 99%

“…Although, the aim of the study was to leverage on the hygroscopic and non‐corrosive properties of ILs, the work did not consider the account of high viscosity, toxicity, and non‐biodegradability tendency of ILs. Different studies have been carried out on LDACs and they are found to have deepened the understanding of the LDACs' potential, limitation, and parametric correlations 25‐28 . To justify any discrepancies between analytical, numerical, and experimental investigation outcomes, Bai et al 29 comparatively revised allowable errors between experimental investigations and the analytical results using data in published literature.…”

Section: Introductionmentioning

confidence: 99%

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

2021

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Liquid desiccant air dehumidification has gained substantial attention recently due to its attractive energy-saving capability, high moisture retention, and low regeneration temperature. However, there are still unresolved limitations in liquid desiccant air conditioning systems (LDACs). Among on-going studies are the search for greener desiccant solvents, high-performance membrane, and regeneration techniques hybridization. This review discusses up-to-date development of the performance influential components of LDACs, such as desiccant properties, regeneration techniques, membranes, energy sources, and hybrid system configurations. The corrosive nature of conventional halide salt solutions, non-biodegradability and high viscosity property of most ionic liquids necessitate the search for alternative solvents in LDACs. Deep eutectic solvents (DES) properties, such as non-corrosive, hygroscopic, biodegradable, and low viscosity idealize promising alternative desiccant solutions. Therefore, DES may be usefully explored and further investigated in LDACs to establish the degree of their capacities in replacing conventional desiccants. Non-thermal regeneration techniques and nanoparticle enhanced membranes were also found to improve the overall energy performance of the LDAC system. Nonthermal regeneration techniques can operate below 40 C and reduce energy utilization between 10% and 50% in indoor space cooling. The coefficient of performance (COP) of this regeneration category is capable of being as high as 6, which is an indication of its promising energy-saving propensity. Highlights• Review on liquid desiccant materials and the potential of deep eutectic solvents as bio-desiccants for air dehumidification.

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A review of correlations and enhancement approaches for heat and mass transfer in liquid desiccant dehumidification system

Cited by 71 publications

References 148 publications

Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

An overview of solutions for airborne viral transmission reduction related to HVAC systems including liquid desiccant air-scrubbing

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

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