School Of Engineering And Engineering Technology, FUTA

 Conferenceproceeding

 Alternative Supplementary Cooling System For Improving Animal Performances In The Naturally Ventilated Livestock Building

 Jongbo, A.O., White D., Norton, T & Moorcroft I.

 2019

Naturally ventilated livestock buildings are known to be energy-saving facilities which neither require mechanical fans for ventilation nor heating system. The safety of livestock, raised in the naturally ventilated buildings, is guaranteed compared to mechanically ventilated livestock buildings where power failures for a few minutes could result in livestock suffocation. However, there are some setbacks militating against the effectiveness of naturally ventilated livestock buildings. These include lack of control over indoor environmental conditions and indoor air velocity distributions. The indoor ventilation is mainly influenced by the outdoor wind speed and direction while the air velocity distributions inside the animal building could be affected by the surrounding facilities. Animals raised in the naturally ventilated building are mostly subjected to heat stress during hot periods as a result of underventilation. Therefore, in order to improve air distribution, air circulation and air mixture within the naturally ventilated livestock building, a new supplementary cooling system was designed, developed and tested. The system comprises a fan unit as a source of air and an air turbulence unit for increasing airflow turbulence, air distribution, air mixture and air circulation in the animal occupied zones. The system has three fan speeds (f_f ), three baffle oscillation frequencies (b_f ) and three baffle oscillation angles (b_a ). The operations of the system depend on the required airflow in the animal occupied zones, programmed into the ventilation system. An empirical model was developed which predicts the speed of air produced by the system. The system is suitable for all naturally ventilated livestock buildings. 

 International Journal Of Engineering Applied Sciences And Technology

 Journal

 STATE-OF-THE-ART TECHNOLOGIES FOR ASSESSING THERMAL COMFORT OF BROILER CHICKENS

 Jongbo, A. O. And Atta, T. A.

 2019

The thermal assessment of the environment where poultry birds are raised is very important to prevent them from poor welfare, poor health and poor performance. Contain evaluation of poultry environment would enable the poultry growers to understand the conditions of their flocks and also to know when there is a change in the behaviours of the birds. In order to assess the thermal comfort of broiler chickens without disturbing them, there is a need for the state-of-the-art technologies. There are different technologies adopted by various researchers to evaluate the thermal comfort of broiler chicken subjected to different environmental conditions. However, there is no comprehensive report on the techniques for assessing the thermal comfort of broiler chicken. Therefore, this study intended to comprehensively compile all the available technologies which have been used by the researchers to evaluate the thermal comfort of broiler chickens. This study has found out that, apart from thermal indices, precision livestock farming (PLF) equipment are very important tools which could be adopted by all broiler chicken growers to assess the thermal comfort of broiler chickens during hot conditions in order to prevent them from heat stress. Furthermore, it has also been reported that most farmers may not be able to afford the tools due to their high initial investment, unavailability of technical-know-how and high maintenance cost most especially in the developing countries. 

 CIGR-AgEng

 Conference

 A Dynamic Air Supplying System For Increasing Broiler Heat Loss During Hot Periods

 Jongbo, A. O., Scott, G. And Norton, T

 2016

To improve the thermal comfort of broiler chickens during hot periods, there is a need for fast cooling technique. One means of doing this is by increasing turbulence intensity in birds’ microclimate. This is important as the available fans in the commercial broiler buildings are unable to provide a better microclimate for the birds in hot weather. Increasing the turbulence of air around birds requires a device with which its variable speeds and flap speeds can be changed. To this end, a dynamic air supply system was designed, developed and characterised. The system was characterised based on the effect of the fan speed (760 ± 3.36 rpm (low) and 1160 ± 7.76 rpm (high)), the flap speed (100 rpm (low) and 150 rpm (high)) and the directions of flap rotation (clockwise and counter-clockwise) on airflow turbulence intensity. The results showed that a change in the direction of rotation from clockwise to counter-clockwise caused the airflow turbulence intensity produced by the system to increase by 11%. Also, a unit increase in fan speed and flap speed resulted in 5 % decrease and 5 % increase in airflow turbulence intensity respectively. The effect of direction of flap’s rotation on flap speed also caused the airflow turbulence intensity to increase by 5 %. Although fan speed was found having negative influence on the response (airflow turbulence intensity), its effect on the turbulence intensity cannot be neglected as flap speed and its direction of rotation could not generate required turbulence intensity. In general, the device is capable of producing over 60 % airflow turbulence intensity at all levels of fan speed and flap speed with the flap rotating in counter-clockwise direction. 

 Projournal Of Agricultural Science Research

 Journal

 Effect Of Some Environmental Variables On Development Of Broilers In Humid Tropical Environment

 Jongbo A. O And Falayi F. R.

 2013

An alternative broiler housing units were designed and developed. The housing is made of 50.8 X 50.8 mm, 50.8 X 76.2 mm and 25.5 X 304.8 mm hard wood. Other components include metal roofing sheet, 76.2 mm nails, 50.8 mm nails 2.54 mm nails and chicken net. The housing units are of dimensions: length = 1160 mm, breadth = 580 mm and height = 1000 mm. The results showed that as ambient temperature reduced, the relative humidity increased. Likewise as the body weight of broilers increases, there was an increase in ambient temperature within the housing. Final body weight of broilers recorded ranged from 2.40 to 2.80 Kg 

 Journal Of Agricultural Engineering Technology.

 Journal

 Development Of Metal-in-wall Evaporative Cooling System For Storing Perishable Agricultural Produce In A Tropical Environment

 F.R. Falayi And A.O. Jongbo

 2011

The problem of storage of perishable agricultural produce cannot be overemphasized in a developingcountry like Nigeria. To reduce the level of deterioration of produce at village level, a metal-in-wallevaporative cooling chamber was developed using bricks and seabed sand. The evaporative coolingsystem was constructed with local ram materials, uses the natural cooling system and does not requireelectrical or mechanical energy. Storage trials were conducted with tomatoes and vegetable leaves.Temperature and relative humidity of the evaporative cooling system chamber and the ambient storagewere measured and recorded for eight days. Weight loss of the produce and visual observations werecarried out to determine the level of deterioration of the produce. It was discovered that the coolingchamber had an average temperature drop of about 7° C when compared with the ambient temperatureand an average relative humidity drop of about 4% was experienced throughout the period of the study.The percentage weight loss in the cooler was 4% and 17% for tomatoes and amaranthus respectivelywhile the percentage weight loss in ambient storage condition was found to be 24% and 74% for tomatoesand amaranthus respectively. The metal-in-wall evaporative cooling system is efficient and cansuccessfully store fruits and vegetables for 6 to 8 days without any visible deterioration.