The Experiment and Simulation of Solid Desiccant Dehumidification for Air-Conditioning System in a Tropical Humid Climate
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Abstract
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 kg w /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 kg w /kg da (14%) and 0.71 kW th (19.26%), respectively. Consequently, the thermal comfort was improved from 0.5 PMV (10.12% PPD) to 0.3 PMV (7.04% PPD).
- Conditions for Human Occupancy,” ASHRAE, Inc., Atlanta, 1992.
- N. Yamtraipat, J. Khedari and J. Hirunlabh, “Thermal Comfort Standards for Air Conditioned Buildings in Hot and Humid Thailand Considering Additional Factors of Acclimatization and Education Level,” Solar Energy, Vol. 78, No. 4, 2005, pp. 504-517. doi:10.1016/j.solener.2004.07.006
- P. Gandhidasan, A. A. Al-Farayedhi and A. A. Al-Mubarak, “Dehydration of Natural Gas Using Solid Desiccants,” Energy, Vol. 26, No. 9, 2001, pp. 855-868. doi:10.1016/S0360-5442(01)00034-2
- M. M. Awad, A. K. Ramzy, A. M. Hamed and M. M. Bekheit, “Theoretical and Experimental Investigation on the Radial Flow Desiccant Dehumidification Bed,” Applied Thermal Engineering, Vol. 28, No. 1, 2008, pp. 7585. doi:10.1016/j.applthermaleng.2006.12.018
- V. Akvanich and J. Taweekun, “Computational Fluid Dynamics (CFD) Simulations for the Effect of Flow-Bed Geometries on Desiccant Column,” Proceedings of the Annual International Conference of the FDTT, Singapore, 17-18 March 2012, pp. 19-24.
- P. L. Dhar and S. K. Singh, “Studies on Solid Desiccant Based Hybrid Air-Conditioning Systems,” Applied Thermal Engineering, Vol. 21, No. 2, 2001, pp. 119-134. doi:10.1016/S1359-4311(00)00035-1
- M. H. Ahmed, N. M. Kattab and M. Fouad, “Evaluation and Optimization of Solar Desiccant Wheel Performance,” Renewable Energy, Vol. 30, No. 3, 2005, pp. 305325. doi:10.1016/j.renene.2004.04.010
- F. E. Nia, D. V. Paassen and M. H. Saidi, “Modeling and Simulation of Desiccant Wheel for Air Conditioning,” Energy and Building, Vol. 38, 2006, pp. 1230-1239. doi:10.1016/j.enbuild.2006.03.020
- ANSYS FLUENT, “Technical Specifications Public Notice,” ANSYS, Inc., Canonsburg, 2009.
- H. K. Versteeg and W. Malalasekera, “An Introduction to Computational Fluid Dynamics, the Finite Volume Method,” Longman Limited, London, 1995.
- M. Kanoglu, M. O. Carpinlioglu and M. Yildirim, “Energy and Exergy Analyses of an Experimental Open-Cycle Desiccant Cooling System,” Applied Thermal Engineering, Vol. 24, No. 5-6, 2004, pp. 919-932. doi:10.1016/j.applthermaleng.2003.10.003
- P. O. Fanger, “Thermal Comfort,” Danish Technical Press, Copenhagen, 1970.