EVALUATION OF THREE EVAPORATIVE COOLING PADS FROM AGRICULTURAL WASTES | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 10, Volume 27, Issue 3, July 2010, Page 924-942 PDF (678.96 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2010.105753 | ||||
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| Authors | ||||
| S. A. Tayel1; M. A. Mosallam2; A. M. Mousa3 | ||||
| 1Prof., Agr. Eng. Dept., Fac. of Agr., AL-Azhar Univ., Egypt. | ||||
| 2Assoc. Prof., Agr. Eng. Dept., Fac. of Agr., AL-Azhar Univ., Egypt. | ||||
| 3Demonstrator, Agr. Eng. Dept., Fac. of Agr., AL-Azhar Univ., Egypt. | ||||
| Abstract | ||||
| A Gable even span greenhouse 3 × 2 × 2.6 m was constructed. This greenhouse was equipped with an evaporative cooling system. Three waste materials were used as pads for this system. These materials are: Flax plant residues, Luffa plant residues and the third material was a combination of the two materials. Each pad material was tested under three thicknesses. These thicknesses are 4, 8 and 12 cm. Each thickness for each of the three materials was tested under three velocities. These velocities are 0.45, 0.65 and 0.90 m/s. The experiments were carried out during august 2008 where the mean ambient temperature was 35.8 oC and the mean relative humidity was 39.6 %. Mean cool temperatures at the pads were 25.5, 25.9 and 26.6 oC for Flax plant residues, Luffa Plan residues and the combined material respectively. Highest cooling efficiency was 97.7 % when using Flax plant residues pad material with thickness 12 cm at pad face air velocity 0.65 m/s. For Luffa material the highest cooling efficiency was 91% at used pad thickness 12 cm and pad face air velocity 0.45 m/s. For the Combined material the highest cooling efficiency was 94.4 % at used pad thickness 12 cm and pad face air velocity 0.45 m/s. The research concluded to that the recommended pad is Flax and the recommended thickness for the system is 12 cm and the recommended pad face velocity is 0.45 m/s. The correcting Length factor “K” for the greenhouses of length “L” where: was determined roughly by the eye carve fitting. | ||||
| References | ||||
|
Alchalabi, D. A. (1996). Computer – aided design for evaporative cooler system and estimating number of air coolers in poultry houses. J. AMA, 27(4):49-52, 55.
Ashrae. (1992). Evaporative air-cooling in Equipment. Handbook, Ch: 19, Atlanta, GA: American Society of Heating, Refrigeration and Air-Conditioning Engineers, Inc., Atlanta, GA 30329.
Ashrae. (1983). Evaporative Air-cooling Equipment. Chapter 4. Equipment Handbook. American Society of Heating, Refrigeration and Air-Conditioning Engineers. Atlanta, Georgia, USA.
Bottcher, R. W.; L. B. Drigger.; T. A. Carter and A. O. Hobbs (1992). Filed evaluation of reflective bubble-pack isolation in broiler house. Journal of applied engineering, 8 (3): 369-374.
Chandra, P. (2000). Short course on greenhouse cooling in tropical regions. Division of agricultural engineering, I.A.R.I, New Delhi.
Darwesh , M.; S. Abouzaher.; T. Fouda and M. Helmy (2007). Effect of using pad manufactured from agricultural residues on the performance of evaporative cooling system. Misr. J.Agr. Eng, 24(4):1023-1041.
Durward, S. B.; and F. Wiersma (1974). Design criteria of evaporative cooling for agricultural application. ASAE, Dec., paper No: 74 – 4527.
El-Zan, N. M (2008). Effect of roof water flow and new evaporative cooling pads on cooling performance inside the greenhouse. MSC. thesis Fac. of Agric. Kafer ElSheikh Univ.
Hassan, A. A (1999). Technology of Greenhouses (In Arabic). Hand book – academic library for publishing and distribution. 535 P.P: 111-142.
Hellickson, M. L and J.N. Walker (1983). Ventilation of agricultural structures. ASAE. St. joseph, MI. 49085-9659.
Liao, C. M. and H. Kara (2002). Wind tunnel modeling the system performance of alternative evaporative cooling pads in Taiwan region. Building and Environment, No.37, p.p: 177-187.
Papa, A. A. and D. A. El-Galabi (1997). Constructed palm fibers pads of evaporative cooling. Transaction of the ASAE, 71 (26): 1-14.
Sethi, V. P. and S. K. Sharma (2007). Survey of cooling technologies for worldwide agricultural greenhouse applications. Solar Energy. 81, 1447-1459.
Sharaf, S. M. (1994). Reducing heat stresses in poultry house under local conditions. Menofiya. J. Agric. Res, 6 (1):2937-2955.
Tiwari, G. N. (2003). Greenhouse Technology for Controlled Environment. Narosa Publishing House, India, PP 325-327.
Welchert. W. T. and F. Wiersma (1972). Evaporative cooling for laying house in Arisona. ASAE. P.P: 72 – 914.
Wiersma, S.K. (1969). Evaporative cooling fundamentals in agricultural application. ASAE paper presented at the tunnel convention-specific cost region. Poneix, Arizona. Mar. 20-21. | ||||
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