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Investigation of energy-efficient solid desiccant system for wheat drying

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International Journal of Agricultural and Biological Engineering 2019年第1期12卷 221-228页

作者： Shazia Hanif Muhammad Sultan Takahiko Miyazaki Shigeru Koyama Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityFukuoka 816-8580Japan Department of Agricultural Engineering Bahauddin Zakariya UniversityMultan 60800Pakistan Faculty of Engineering Sciences Kyushu UniversityFukuoka 816-8580Japan International Institute for Carbon-Neutral Energy Research(WPI-I2CNER) Kyushu UniversityFukuoka 819-0395Japan

The study investigates the applicability of solid desiccant system for drying of freshly harvested wheat grains in order to reduce the moisture content to an optimum *** and low-temperature drying systems are required by today’s drying industries in order to provide economical and safe ***,comparison of desiccant drying has been made with the conventional method in terms of drying kinetics,allowable time for safe storage,the total time for drying cycle,and overall energy *** has been found that the air conditions of proposed desiccant drying system provides a high drying rate and longer allowable storage time for safe *** the desiccants possess water adsorbing ability by means of vapor pressure deficit,therefore,the desiccant system successfully provides low-temperature drying which ensures the quality of wheat *** energy consumption is estimated for both conventional hot air drying and desiccant drying *** has been found that the desiccant system requires less energy as drying is accomplished at minimum level of air flow and within allowable storage *** addition,the overall performance index of the desiccant system is higher at all *** study is useful for developing a low-cost and sustainable drying technology for various agricultural products.

关键词： desiccant solid desiccant system drying grain wheat performance evaluation

Economic Investigation on the Ultrasonic Atomization Dehumidifying System with Liquid desiccant and Its Potential Best-Fit Application

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Journal of Donghua University(English Edition) 2019年第6期36卷 547-558页

作者： YANG Zili LIAN Zhiwei ZHONG Ke TAO Ruiyang NI Hui College of Environmental Science and Engineering Donghua UniversityShanghai 201620China School of Design Shanghai Jiao Tong UniversityShanghai 200240China

The performance of liquid desiccant dehumidification systems can be improved substantially by applying the ultrasonic atomization ***,considering the currently-high expense and extra power for the ultrasonic atomizers,it’s unclear if the ultzasonic atomization dehumidifying system(UADS)possesses good economic performance over the conventional packed-bed(PBD)*** paper conducted a comparative study on the economic performance between the UADS and *** economic analysis model integrated with the empirical formulae was established while an office building located in Guangzhou,China was employed as the study *** results indicate the UADS may fit best for buildings with deep-dehumidification needs but smaller-scale areas.

关键词： economic performance liquid desiccant energy saving of buildings ultrasonic atomization

Performance Evaluation of Single Bed desiccant Desorption Process

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Natural Resources 2013年第1期4卷 69-75页

作者： Yasser A. F. El-Samadony Ahmed M. Hamed Abd Elnaby Kabeel Mechanical Power Department Faculty of Engineering Mansoura University Mansoura Egypt Mechanical Engineering Department Faculty of Engineering Taif University Taif KSA Mechanical Power Engineering Department Faculty of Engineering Tanta University Tanta Egypt

In the present study, dynamic performance of single bed desiccant regeneration system has been investigated experimentally. The desiccant bed operates as an adsorber and then as a regenerator, intermittently. In the experimental work of this investigation, Silica gel is used as a desiccant material. In the regeneration process, hot air from an air heater is blown through the bed using an air blower. The performance of desorption process at different conditions of flowing air is demonstrated. The experimental tests were carried out at different conditions of inlet air and initial bed parameters. Temperature and humidity of air at inlet and exit of the bed were measured. The obtained results showed that hot air with an inlet temperature ranging from 40°C to 75°C could release a notable amount of water from the desiccant bed. The relation between the studied parameters during the desorption processes is correlated. Results also show that the “Rehabilitation period” in desorption process should be eliminated to decrease the desorption time and it could be eliminated if the hot air mass flow rate is greater than 1.92 kg/hr per kg of silica gel.

关键词： desiccant Regeneration Desorption Silica Gel

The Experiment and Simulation of Solid desiccant Dehumidification for Air-Conditioning System in a Tropical Humid Climate

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Engineering（科研） 2013年第1期5卷 146-153页

作者： Juntakan Taweekun Visit Akvanich Department of Mechanical Engineering Faculty of Engineering Prince of Songkla University

The aim of this research was to study and design a solid desiccant dehumidification system suitable for tropical climate to reduce the latent load of air-conditioning system and improve the thermal comfort. Different dehumidifiers such as desiccant column and desiccant wheel were investigated. The ANSYS and TRASYS software were used to predict the results of dehumidifiers and the desiccant cooling systems, respectively. The desiccant bed contained approximately 15 kg of silica-gel, with 3 mm average diameter. Results indicated that the pressure drop and the adsorption rate of desiccant column are usually higher than those of the desiccant wheel. The feasible and practical adsorption rate of desiccant wheel was 0.102 kgw/h at air flow rate 1.0 kg/min, regenerated air temperature of 55?C and at a wheel speed of 2.5 rpm. The humidity ratio of conditioning space and cooling load of split-type air conditioner was decreased to 0.002 kgw/kgda (14%) and 0.71 kWth (19.26%), respectively. Consequently, the thermal comfort was improved from 0.5 PMV (10.12% PPD) to 0.3 PMV (7.04% PPD).

关键词： Solid desiccant Dehumidification Air-Conditioning System Tropical Humid Climate

Optimization of desiccant Absorption System Using a Genetic Algorithm

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Journal of Software Engineering and Applications 2011年第9期4卷 527-533页

作者： Ayman A. Aly 不详

Optimization of the open absorption desiccant cooling system has been carried out in the present work. A finite difference method is used to simulate the combined heat and mass transfer processes that occur in the liquid desiccant regenerator which uses calcium chloride (CaCl2) solution as the working desiccant. The source of input heat is assumed to be the total radiation incident on a tilted surface. The system of equations is solved using the Matlab-Simulink platform. The effect of the important parameters, namely the regenerator length, desiccant solution flow rate and concentration, and air flow rates, on the performance of the system is investigated. In order to optimize the system performance, a genetic algorithm technique has been applied. The system coefficient of performance COP has been maximized for different design parameters. It has been found that the maximum values of COP could be obtained for different combinations of regenerator length solution flow rate and air flow rate. Therefore, it is essential to select the design parameters for each ambient condition to maximize the performance of the system.

关键词： Genetic Algorithm Modeling Optimization Solar-Powered desiccant

Development of Eggshell Waste Incorporated with a Porous Host as a Humidity Adsorption Material

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Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 974-983页

作者： BOONSOOK Kanokwan NAEMCHANTHARA Patcharin LIMSUWAN Pichet NAEMCHANTHARA Kittisakchai Department of Physics Faculty of ScienceKing Mongkut’s University of Technology Thonburi28 Bangkok 10140Thailand Department of Material and Process Engineering Technology 29 Faculty of Engineering and TechnologyKing Mongkut’s University of Technology North Bangkok30 Rayong CampusRayong 21120Thailand

The duck eggshell waste was developed to the novel desiccant that is friendly to human and *** calcium oxide(Ca O)and calcium chloride(CaCl_(2))as the calcium-based desiccants were prepared from eggshell *** Ca O desiccant derived from the eggshell waste sintering at 1300℃,while the CaCl_(2)desiccant was extracted from eggshell waste with the hydrochloric(HCl)solution at difierent concentrations from 5 to 30 wt%.The yield percentage of CaCl_(2)desiccant increased with increasing the HCl concentration to 25 wt%.The humidity adsorption behavior were investigated in the range of 75%-5%relative *** results show the CaCl_(2)desiccant has the highest hydration *** porous host from the kaolin was sintered at different temperatures from 200 to 1000℃and incorporated with 30%w/v concentrations of CaCl_(2).The physical properties and the humid-adsorption capacity of all porous host conditions were *** porous host at sintering temperature 800℃has the highest specific surface ***,the porous host at sintering temperature 800℃with the 30%w/v concentration of CaCl_(2)desiccant has the highest humid-adsorption capacity.

关键词： Eggshell waste Calcium chloride desiccant Kaolin Porous materials

Feasibility of Using Wood Chips to Regulate Relative Humidity Inside a Building: A Numerical Study

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Journal of Renewable Materials 2019年第6期7卷 505-516页

作者： Dimitri Bigot Cyril Ott Stéphane Guichard Bruno Malet-Damour University of La Réunion-40 avenue de Soweto-Terre Sainte-BP 373-97455 Saint-Pierre CedexLa RéunionFrance

The use of bio-based materials in buildings has become more and more significant last *** most of the cases,their health properties and natural provenance have made them a great solution to face global climate warming and the new policies to reduce building energy *** many thermal problems,biobased materials can allow to optimize the building thermal behavior according to its energy consumption and inside comfort *** it is when they are used as an insulation material in the ***,it is not the case in this *** fact,the bio-based matter is rather used as a desiccant wheel to control air conditioning inside the *** aim of this paper is to numerically verify if it is possible to use a bed of wood chips as a hygroscopic material(or a desiccant matter)in order to modify the relative humidity inside the building in Reunion Island and so improve thermal comfort.A simple model of heat and mass transfer between a bed of wood chips and building inside air has been set up and implemented into a validated building simulation code named *** simulations were set up for the four climate zones of the island regulations and a focus has been made on the low altitude one(with high,solar irradiation,temperature and relative humidity).Simulation results give the thermal behavior of the building particularly the temperature and relative humidity of inside air temperature,and temperature and moisture content of wood *** obtained results lead to determine if the wood chips bed is suitable for the reference building and to verify its technical feasibility(wood species,size of the bed,integration to the building,etc.).The results show that the use of a WCB help to decrease the building inside air temperature and water content up to 10°C less and 11.6 ***-1 *** are the ways to improve inside comfort ***,comfort analysis have shown the possibility to significantly increase building users’thermal comfort

关键词： Wood chips bed building inside comfort bio-based material desiccant relative humidity temperature building thermal modelling

Application of Solar Energy for Recovery of Water from Atmospheric Air in Climatic Zones of Saudi Arabia

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Natural Resources 2011年第1期2卷 8-17页

作者： Ahmed M. Hamed Ayman A. Aly El-Shafei B. Zeidan Department of Mechanical Engineering Faculty of Engineering Taif University

In the present work, an investigation on the application of solar energy to heat a sandy bed impregnated with calcium chloride for recovery of water from atmospheric air is presented. The study also aimed at evaluating the effects of different parameters on the productivity of the system during regeneration. These parameters include system design characteristics and the climatic conditions. An experimental unit has been designed and installed for this purpose in climatic conditions of Taif area, Saudi Arabia. The experimental unit which has a surface area of 0.5 m2, comprises a solar/desiccant collector unit containing sandy bed impregnated with calcium chloride. The sandy layer impregnated with desiccant is subjected to ambient atmosphere to absorb water vapor in the night. During the sunshine period, the layer is covered with glass layer where desiccant is regenerated and water vapor is condensed on the glass surface. Ambient temperature, bed temperature and temperature of glass surface are recorded. Also, the productivity of the system has been evaluated. desiccant concentration at start of regeneration is selected on the basis of the climatic data of Al-Hada region, which is located at Taif area, Saudi Arabia. Experimental measurements show that about 1.0 liter per m2 of pure water can be regenerated from the desiccant bed at the climatic conditions of Taif. Liquid desiccant with initial concentration of 30% can be regenerated to a final concentration of about 44%. desiccant concentration at start of regeneration is selected on the basis of the climatic data of Al-Hada region. The climate of Taif city is dry compared with that for Al-Hada region. This method for extracting water from atmospheric air is more suitable for Al-Hada region especially in the fall and winter.

关键词： Extraction Atmospheric Air Absorption Liquid desiccant Solar Energy Dew Collection Regeneration