Performance Analysis of a Counter Flow Liquid Desiccant Dehumidifier Using Different Packing Materials PDF Download

Author: Yuhao Tang
Publisher:
ISBN:
Category : Air conditioning
Languages : en
Pages : 79

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Author: Mohammad Rifat Ullah
Publisher:
ISBN:
Category : Solar air conditioning
Languages : en
Pages : 514

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Author: Lingshi Wang
Publisher:
ISBN:
Category : Air conditioning
Languages : en
Pages : 173

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Secondly, experimental studies on the dehumidification performance of a compact liquid desiccant dehumidifier using structured packing with a high specific surface area (650 m2/m3) are conducted. New empirical equations correlating the moisture effectiveness and the enthalpy effectiveness as well as the heat and mass transfer coefficients with critical inlet parameters are developed. Lewis number during the dehumidification process is also discussed to analyze the coupled heat and mass transfer characteristics. The performance of the present type of packing is compared with other types of packing studied in literature. Besides, the influences of the inlet conditions of the air and the desiccant as well as the packing height on the dehumidification performance are also investigated and compared with the results reported in previous studies, which is valuable for the design of compact liquid desiccant dehumidifiers. Thirdly, the dynamic heat and mass transfer characteristics of a counter-flow packed-type liquid desiccant dehumidifier are studied experimentally. Two types of transient working conditions are tested in experiments: at the beginning of a dehumidification process (by two different scenarios) and the step changes of inlet fluids parameters (inlet air humidity ratio and the solution flow rate). Dynamic responses of the outlet air and desiccant solution as well as dynamic moisture removal rate are displayed and discussed. Fourthly, a simplified one-dimensional dynamic model is also developed for simulating the dynamic characteristics of the counter flow packed-type liquid desiccant dehumidifier. Convenient approaches to quantifying the thermal mass of the packing and the desiccant solution held in the dehumidifier are proposed, which are essential parameters of the dynamic model. Numerical solution for the proposed model is developed. The model is tested and validated experimentally under different transient operating conditions. Finally, the dynamic characteristics of the dehumidifier are investigated by parameter analysis method. Time constants of the dynamic humidity and temperature of outlet air are introduced to evaluate the dynamic response of the dehumidifier. The influences of two operation parameters (i.e. the air flow rate and the solution flow rate) and one configuration parameter (i.e. the height of the packing) on the time constants are analyzed experimentally. Besides, the influences of thermal mass of the dehumidifier on the time constants are also analyzed using the proposed dynamic model.

Author: Mark Alan Long
Publisher:
ISBN:
Category : Air conditioning
Languages : en
Pages :

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A finite difference model simulating a liquid desiccant dehumidification tower with lithium chloride as the desiccant solution has been developed. The model determines the packing height needed for a condensation rate. Comparisons with experimental data illustrates that the model produces valid results. Air and desiccant solution temperatures within the dehumidification tower show that a temperature increase is experienced for both the air and desiccant solution from their respective entrances and exits from the tower. Increasing the air mass velocity or the amount of moisture removed from the air supply causes an increase in packing height. Increasing the desiccant mass velocity decreases the packing height.

Author: Muthukumar Palanisamy
Publisher: Springer Nature
ISBN: 9813341653
Category : Technology & Engineering
Languages : en
Pages : 505

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This book presents select proceedings of the International Conference on Innovations in Thermo-Fluid Engineering and Sciences (ICITFES 2020). It covers topics in theoretical and experimental fluid dynamics, numerical methods in heat transfer and fluid mechanics, different modes of heat transfer, multiphase flow, fluid machinery, fluid power, refrigeration and air conditioning, and cryogenics. The book will be helpful to the researchers, scientists, and professionals working in the field of fluid mechanics and machinery, and thermal engineering.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
A finite difference model simulating a liquid desiccant dehumidification tower with lithium chloride as the desiccant solution has been developed. The model determines the packing height needed for a condensation rate. Comparisons with experimental data illustrates that the model produces valid results. Air and desiccant solution temperatures within the dehumidification tower show that a temperature increase is experienced for both the air and desiccant solution from their respective entrances and exits from the tower. Increasing the air mass velocity or the amount of moisture removed from the air supply causes an increase in packing height. Increasing the desiccant mass velocity decreases the packing height.

Author: Chua Kian Jon
Publisher: Springer Nature
ISBN: 981158477X
Category : Technology & Engineering
Languages : en
Pages : 313

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Book Description
This book highlights key recent developments in air conditioning technologies for cooling and dehumidification with the specific objectives to improve energy efficiency and to minimize environmental impact. Today, air conditioning, comprising cooling and dehumidification, is a necessity in commercial and residential buildings and even in many industrial processes. This book provides key update on recent developments in air conditioning systems, cooling cycles and innovative cooling/dehumidification technologies. Key technologies related to cooling include heat-driven absorption and adsorption cooling and water-based dew point evaporative cooling. Technologies connected with dehumidification involve new generations of adsorbent–desiccant dehumidifiers, liquid-based desiccants and membranes that sieve out water vapor from air. Losses in cooling cycles and thermo-economic analysis for a sustainable economy are also judiciously documented.

Author: Tin Yuet Yau
Publisher:
ISBN:
Category : Air conditioning
Languages : en
Pages : 180

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Author: Ritunesh Kumar
Publisher: Springer Nature
ISBN: 9811631328
Category : Technology & Engineering
Languages : en
Pages : 251

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This book presents the select proceedings of the International Conference on Advances in Sustainable Technologies (ICAST 2020), organized by Lovely Professional University, Punjab, India. It gives an overview of recent developments in the field of fluid dynamics and thermal engineering. Some of the topics covered in this book include HVAC systems, alternative fuels, renewable energy, nano fluids, industrial advancements in energy systems, energy storage, multiphase transport and phase change, conventional and non-conventional energy theoretical and experimental fluid dynamics, numerical methods in heat transfer and fluid mechanics, different modes of heat transfer, fluid machinery, turbo machinery, and fluid power. The book will be useful for researchers and professionals working in the field of fluid dynamics and thermal engineering.

Author: Anthony L. Hines
Publisher: Prentice Hall
ISBN:
Category : Science
Languages : en
Pages : 570

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Book Description
A thorough introduction to the fundamentals and applications of microscopic and macroscopic mass transfer.