"ENVIRONMENTAL CONTROL INSIDE AN AGRICULTURAL STRUCTURE" PERFORMANCE CRITERIA OF TWO EVAPORATIVE COOLING PADS MADE OF AGRICULTURAL RESIDUES TO REDUCE HEAT STRESS INSIDE AGRICULTURAL STRUCTURES
Mohamed Ramadan Ahmed Darwish;
Abstract
Heat stress inside agricultural structures 1s one of the problems facing producers especially in hot climate areas such as the situation of summer in Egypt. The need to an environmental control system that can be constructed as a hand made system and easy to be operated to cope with that problem became a virtual requirement. Therefore, the present study was devoted to construct an evaporative cooling system belonging to pad and fan system using agricultural residues as pad materials. Investigating its performance criteria under different technical specifications such as pad material, pad thickness and pad face air velocity were carried out as well.
Rice straw and palm leaf fibers (Kerina) were used as pad materials. Four pad
thickness 3, 6, I 0, 15 em and three pad face air velocity 0.3, 0.5, 1.05 m/s were used in the investigation of the performance criteria of the system. It was revealed that both of pad material could be used in the suggested evaporative cooling system. Rice straw pad material proved more efficiency in temperature reduction, i.e. reducing heat stress inside the agricultural structure. On the other hand the disadvantage of increasing relative humidity was obviously noticed. This problem was not a predicable when using palm leaf fibers (Kerina) as had the pad material. The application of temperature- humidity index (THI) concept revealed that the suggested system capability in reducing THI compared with the THI of the ambient air outside the structure in all treatments. However, the suggested evaporative cooling system may not be the efficient one for some biological systems such as broiler housing systems from the view point of THI. The other performance criteria of the suggested system such as saturation efficiency (SE), Unit of evaporative cooler performance (Unit ECP) and the ratio of temperature reduction to airflow rate were introduced as well.
Rice straw and palm leaf fibers (Kerina) were used as pad materials. Four pad
thickness 3, 6, I 0, 15 em and three pad face air velocity 0.3, 0.5, 1.05 m/s were used in the investigation of the performance criteria of the system. It was revealed that both of pad material could be used in the suggested evaporative cooling system. Rice straw pad material proved more efficiency in temperature reduction, i.e. reducing heat stress inside the agricultural structure. On the other hand the disadvantage of increasing relative humidity was obviously noticed. This problem was not a predicable when using palm leaf fibers (Kerina) as had the pad material. The application of temperature- humidity index (THI) concept revealed that the suggested system capability in reducing THI compared with the THI of the ambient air outside the structure in all treatments. However, the suggested evaporative cooling system may not be the efficient one for some biological systems such as broiler housing systems from the view point of THI. The other performance criteria of the suggested system such as saturation efficiency (SE), Unit of evaporative cooler performance (Unit ECP) and the ratio of temperature reduction to airflow rate were introduced as well.
Other data
| Title | "ENVIRONMENTAL CONTROL INSIDE AN AGRICULTURAL STRUCTURE" PERFORMANCE CRITERIA OF TWO EVAPORATIVE COOLING PADS MADE OF AGRICULTURAL RESIDUES TO REDUCE HEAT STRESS INSIDE AGRICULTURAL STRUCTURES | Other Titles | تهيئة البيئة داخل منشأ زراعى معايير الاداء لوسادتين تبريد تبخيرى مصنعتين من مخلفات زراعية لخفض الاجهاد الحرارى داخل المنشأت الزراعية | Authors | Mohamed Ramadan Ahmed Darwish | Issue Date | 2006 |
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