IJEP 42(4): 470-475 : Vol. 42 Issue. 4 (April 2022)
1. MGM’S Jawaharlal Nehru Engineering College, Aurangabad – 431 003, Maharashtra, India
2. Shri Tulja Bhavani Engineering College, Tuljapur – 413601, Maharashtra, India
3. Netaji Subhas University of Technology, Civil Engineering Department, West Campus, New Dehli – 110 073, India
Abstract
Passive downdraft evaporative cooling (PDEC) system is a traditional technique of air cooling in hot and dry climates of deserts of Iraq, Tehran, Turkey and Egypt. In present work, PDEC system is restudied for its usefulness, limitations and drawbacks and probable modifications have been suggested to suit energy requirements of built forms. In the present work, efforts have been made to study and design to modify traditional PDEC system and improve its cooling efficiency with help of design of field experimentation, experimental variables, controls and treatments. Theoretical modified PDEC models has been suggested for field experimentation based on the shower model given by B. Givoni. Geometric design of wind catcher has been altered in innovative ways to improve its wind capture efficiency. Modified PDEC shaft square in cross-section is reduced to half of its size from top to bottom to increase wind flow rate of cooled air. Nocturnal water cooling techniques are used to improve air cooling efficiency. Three different water treatments have been studied for wind-catcher conditions for field experimentation model.
Keywords
Evaporative cooling, Heat transfer, Wind catcher, Meteorology, Passive downdraft, Bacteriological infections, Comfort condition
References
- Hughes, B.R., J.K. Calautit and S.A. Ghani. 2012. The development of commercial wind towers for natural ventilation: A review. Appl. Energy J., 92: 606-627.
- Khandelwal, A., P. Talukdar and S. Jain. 2010. Energy savings in a building using regenerative evaporative cooling. Energy Buildings. 43(2-3): 581-591.
- Bahadori, M.N. 1985. An improved design of wind towers for natural ventilation and passive cooling. Solar Energy. 35(2): 119-129.
- Givoni, B. 1991. Performance and applicability of passive and low-energy cooling systems. Energy Buildings. 17(3): 177-199.
- Thomas, L. and G. Baird. 2006. Post-occupancy evaluation of passive downdraft evaporative cooling and air-conditioned buildings at Torrent Research Centre, Ahmedabad, India. Environment.
- Jayswal, M. 2012. To examine the energy conservation potential of passive and hybrid downdraught evaporative cooling: A study for commercial building sector in hot and dry climate of Ahmedabad. Energy Procedia. 30: 1131-1142.
- Nayak, J.K. and J.A. Prajapati. 2006. Handbook of energy conscious buildings. Prepared under interactive R&D project no. 3/4(03)/99-SEC between Indian Institute of Technology, Bombay and Solar Energy Centre, Ministry of Non-conventional Energy Sources.
- Bragera, G., et al. 2015. Evolving opportunities for providing thermal comfort. Building Res. Info., 43(3): 274-287.
- Dehghani, A.A., et al. 2013. Natural ventilation characteristics of one-sided wind catchers: Experimental and analytical evaluation. Energy Buildings. 61: 366-377.
- Bouchahm, Y., F. Bourbia and A. Belhamri. 2011. Performance analysis and improvement of the use of wind tower in hot dry climate. Renewable Energy J., 36: 898-906.
- Kamal, M.A. 2013. Evaluation of evaporative cooling techniques for energy efficiency in buildings. Study Civil Eng. Architecture. 2(3): 61-65.
- Pearlmutter, D., et al. 1996. Refining the use of evaporation in an experimental down-draft cool tower. Energy Buildings. 23: 191-197.
- Givoni, B. 1993. Semi empirical model for a building passive evaporative cool tower. Solar Energy. 50: 425-434.
- Dagtekin, M., C. Karaca and Y. Yildiz. 2009. Performance characteristics of a pad evaporative cooling system in a broiler house in a Mediterranean climate. Biosys. Eng., 103(1): 100-104.
- Givoni, B. 1997. Performance of the shower cooling tower in different climates. Renewable Energy. 10: 173-178.
- Ghassem, M., et al. 2012. Increasing effectiveness of evaporative cooling by pre-cooling using nocturnally stored water. Appl. Thermal Eng. J., 38: 117-123.
