Feasibility study of using agriculture waste as desiccant for air conditioning system
ABSTRACT This research was aimed at investigating the feasibility of using dried agricultural waste as desiccant for an open cycle air conditioning system. The natural fibers are, therefore, intended to replace chemical desiccant such as silica gel, molecular sieves etc. The investigation was limited to Coconut coir (Cocos nucifera) and Durian peels (Durio zibethinus).Experimental results confirmed that dry coconut coir and durian peel can absorb 30 g and 17 g H2O per 100 g dry product, respectively, from air at the average condition of 32°C and 75% relative humidity. The optimum airflow rate is about 84 and 98 m3/hr-100 g dry product, respectively. Therefore, the dry coconut coir is more suitable than the dry durian peel.Comparison between the dry coconut coir and silica gel showed that the average adsorption rate of coconut coir is less than that of silica gel by about 5 g/h-100 g dry product at an airflow rate of 84 m3/h and 60 min operating time. However, it is still an interesting option to replace silica gel in open cycle air conditioning system, as the decrease of average adsorption rate is rather small.The other extremely interesting advantage of coconut coir is that during moisture absorption the heat generated during the process is less important. That means the air leaves the coconut coir bed at a lower temperature compared to that with a silica gel. Therefore, the saving of cooling energy is much more important.
- SourceAvailable from: Masita Mohammad
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- "Results indicated that the dew points of a-amylase-modified corn grits in the pressure swing adsorption system are similar to the molecular sieves with low dew point. Khedari et al. investigated the feasibility of using dried coconut coir (Cocos nucifera) and durian peels (Durio zibethinus) as desiccants for an open-cycle air conditioning system (Khedari et al., 2003b). The investigation revealed that in dry coconut coir, the average adsorption rate is lower than the average adsorption rate of silica gel. "
ABSTRACT: Rapid industrialization created an unending production of agricultural wastes. The utilization of agricultural solid wastes as an energy source or converted material is proposed as a viable solution of reducing pollution and improving the economy. The substitution of agricultural solid wastes for chemical desiccants is a research area that requires careful study. Desiccant-cooling systems have discussed as an applied example for green desiccant application. This work will attempt to study the role and prospect of green desiccants in desiccant-cooling systems from agricultural waste material. One of the most important steps in evaluating agricultural waste application is the collection of comprehensive data on the chemical and physical structures and properties of the waste materials. This study reveals that the experimental characterization is required to determine whether or not agricultural solid wastes are viable desiccants. Characterizations identify the specific treatments necessary to make these materials more efficient. Studies show the porosity enhancement which provides more accessible areas and increasing the number of hydrophilic site on the material will increase its viability for water absorption properties. The findings of this paper enable scholars to optimize both the costs and the technical performance of agricultural solid wastes as desiccant materials. The challenges and some recommendations regarding the application of agricultural wastes as desiccant materials are presented as well.Journal of Cleaner Production 03/2015; 91. DOI:10.1016/j.jclepro.2014.12.015 · 3.84 Impact Factor
- "Some desiccants exhibit greater affinity with oil than with water or other types of liquid materials. The majority of these materials are expensive, which prompts researchers to identify new and more economical materials    . Various researchers have also studied the environmental impact of these desiccants . "
Conference Paper: Investigation of Possibility using of rice husk as desiccant materialsComputer Applications in Environmental Sciences and Renewable Energy, WSEAS, ISBN: 978-960-474-370-4; 06/2014
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- "Recent investigations on solid desiccant generally consists of four aspects, namely, modification of conventional desiccant [23– 27], natural rock-based desiccant  , bio-desiccant      and composite desiccant [3,35–50]. For rotary desiccant dehumidification , researchers are under way to find desiccant materials that approach the type 1M material in its sorption performance , and composites formed by confining salt to porous host adsorbent have been identified to be an effective way . "
ABSTRACT: Rotary desiccant air conditioning system, which combines the technologies of desiccant dehumidification and evaporative cooling, is advantageous in being free from CFCs, using low grade thermal energy and controlling humidity and temperature separately. Compared with conventional vapor compression air conditioning system, it preserves the merits of environment-friendly, energy saving, healthy, comfortable, etc. Ongoing research and development works suggest that new desiccant materials and novel system configurations have significant potential for improving the performance and reliability and reducing the cost and size of rotary desiccant dehumidification and air conditioning system, thereby increasing its market competitiveness and breaking out the current fairly small niche market. For the purpose of providing an overview of recent efforts on these issues and showing how rotary desiccant air conditioning systems can be designed and coupled to available thermal energy, this paper presents and analyzes the status of rotary desiccant dehumidification and air conditioning in the following three aspects: the development of advanced desiccant materials, the optimization of system configuration and the utilization of solar energy and other low grade heat sources, such as solar energy, district heating, waste heat and bioenergy. Some key problems to further push forward the research and development of this technology are also summarized.Renewable and Sustainable Energy Reviews 01/2010; 14(1-14):130-147. DOI:10.1016/j.rser.2009.07.016 · 5.90 Impact Factor