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.
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ABSTRACT: Removal of moisture from the air represents a considerable portion of the air conditioning load in hot and humid regions. It is a common practice to run air conditioning systems at temperatures lower than the moist air dew point temperature in order to accomplish dehumidification. Desiccant air conditioners offer a solution to meet the humidity and temperature requirements of buildings via decoupling latent and sensible loads. In this work, the performance of a new desiccant material is investigated experimentally. This desiccant material has a unique S-shape isotherm and can be regenerated using a low temperature heat source. The effects of the process air stream's temperature and humidity, the regeneration temperature, the ventilation mass flow rate, and the desiccant wheel's rotational speed on the cycle performance are investigated. ARI-humid conditions are used as a baseline. The moisture mass balance is maintained within 5% for all conducted tests. The results are presented in terms of the moisture removal rate and latent COPlat (coefficient of performance). The results show a desiccant wheel's COPlat higher than unity when it is coupled with an enthalpy wheel.Energy 01/2015; 81. DOI:10.1016/j.energy.2014.11.084 · 4.16 Impact Factor
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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 · 3.59 Impact Factor
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