Experimental investigation and parametric studies on structured packing chamber based liquid desiccant dehumidification and regeneration systems

Naik, B. Kiran; Muthukumar, P.

doi:10.1016/j.buildenv.2018.12.028

Cited by 48 publications

(12 citation statements)

References 49 publications

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“…7 and 8, the median pore diameter in the DMF containing membranes was smaller, and the number of pores was higher. Therefore, it can be concluded that the DMF had more interaction with moist air and thus resulted in a more enhanced air dehumidification yield [32]. According to Fig.…”

Section: Simulation Resultsmentioning

confidence: 85%

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: Simulation Resultsmentioning

confidence: 85%

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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“…With this arrangement, moisture removal capacity is improved; however, energy demand and pressure drop increases and operational flexibility decreases, leading to higher operational and maintenance costs. Therefore, a single-stage liquid desiccant dehumidification system (SLDD) is chosen as an alternative option for reducing the dehumidified air outlet temperature and also for decreasing the pressure drop [15][16][17][18][19][20][21][22][23][24].…”

Section: Methodsmentioning

confidence: 99%

“…Boundary conditions: T a (0, t) = T a,r T a (0, t) = T a,p ω a (0, t) = ω a,r ω a (0, t) = ω a,p Overall heat exchange (Q o ) between the air and desiccant side is given as [22]:…”

Section: Solid Desiccant Wheelmentioning

confidence: 99%

“…Q o =ṁ a C p,m T o a − T i a +ṁ a δ ω o a − ω i a (16) where Q sen =ṁ a C p,m T o a − T i a ; Q lat =ṁ a δ ω o a − ω i a ; Q o = Q lat + Q sen ; C pm is the specific heat capacity of moist air, and Q sen and Q lat are the sensible and latent heat exchanges between the air and the desiccant. Latent heat ratio (ζ) defined by Equation (17) is the ratio of latent heat exchange (Q lat ) to the overall heat exchange (Q o ) between the air and the desiccant sides [22].…”

Section: Solid Desiccant Wheelmentioning

confidence: 99%

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Investigating Solid and Liquid Desiccant Dehumidification Options for Room Air-Conditioning and Drying Applications

et al. 2020

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This study reports on the investigation of the performance of single and two-stage liquid and solid desiccant dehumidification systems and two-stage combined liquid and solid desiccant dehumidification systems with reference to humid climates. The research focus is on a dehumidification system capacity of 25 kW designed for room air conditioning application using the thermal models reported in the literature. RD-type silica gel and LiCl are used as solid and liquid desiccant materials, respectively. In this study, the application of proposed system for deep drying application is also explored. Condensation rate and moisture removal efficiency are chosen as performance parameters for room air conditioning application, whereas air outlet temperature is chosen as performance parameter for deep drying application. Further, for a given range of operating parameters, influences of air inlet humidity ratio, flow rate, and inlet temperature on performance parameters of the systems are investigated. In humid climatic conditions, it has been observed that a two-stage liquid desiccant dehumidification system is more effective for room air conditioning application, and two-stage solid desiccant dehumidification system is more suitable for deep drying application in the temperature range of 50 to 70 °C, while single-stage solid desiccant and two-stage combined liquid and solid desiccant dehumidification systems are more effective for low temperature, i.e., 30 to 50 °C deep drying application.

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“…Meanwhile effectiveness of crossflow dehumidification rises from 60 to 63%. B. Kiran Naik [9] performed experimental investigation of energy exchange between ambient air and desiccant. Influence of humidity of air on performance of liquid desiccant dehumidification system is studied.…”

Section: Literature Surveymentioning

confidence: 99%

Experimental Investigation of Humidification Efficiency of a Structured Packing-Based Counter Flow Humidification System

Salins

Reddy

2020

Proceedings of the 7th International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT'20)

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Experimental investigation and parametric studies on structured packing chamber based liquid desiccant dehumidification and regeneration systems

Cited by 48 publications

References 49 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

Investigating Solid and Liquid Desiccant Dehumidification Options for Room Air-Conditioning and Drying Applications

Experimental Investigation of Humidification Efficiency of a Structured Packing-Based Counter Flow Humidification System

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