IMPLEMENTATION OF OPTIMIZED K-? TURBULENCE MODEL AND COEFFICIENT OF AIR SPEED VARIATION (CASV) CRITERIA IN IMPROVING TUNNEL VENTILATION SYSTEMS FOR BROILER CHICKEN COOPS
The role of the tunnel ventilation system in regulating the thermal environment inside broiler chicken houses is crucial for achieving the Effective Environmental Temperature (EET), which combines temperature, humidity, and air velocity. However, turbulence in the tunnel ventilation system can lead...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/74656 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The role of the tunnel ventilation system in regulating the thermal environment inside broiler chicken houses is crucial for achieving the Effective Environmental Temperature (EET), which combines temperature, humidity, and air velocity. However, turbulence in the tunnel ventilation system can lead to non-uniform air distribution and variations in EET. In this study, Computational Fluid Dynamics (CFD) is employed with the k-? turbulence model to analyze turbulent airflow characteristics in the chicken house. Despite the popularity and computational efficiency of the k-? turbulence model, its accuracy in modeling turbulent airflow in buildings, especially with preexisting semi-empirical coefficients, is not always reliable. Therefore, this research optimizes three semi-empirical coefficients in the k-? turbulence model using the Nelder-Mead simplex method to improve accuracy in approximating field measurement results. The optimized coefficients obtained are C_?1= 1,66, C_?2= 2,00, and C_?= 0,12.
The validation of the broiler house CFD model is successfully conducted using five statistical parameters, and its accuracy is verified with a relative error rate of 6,24%. With the validated CFD model, a new louver window model is designed to address the issue of air distribution uniformity. The evaluation of air uniformity is based on the Coefficient of Air Speed Variation (CASV) criteria. Three louver window models, namely the tunnel door, vertical louver, and horizontal louver, are proposed in this study. The selection of the best louver window model is performed using the Analytic Hierarchy Process (AHP) method, considering criteria such as air velocity uniformity, streamlines, maximum and minimum velocity ranges, and the required air flow rate for broiler chickens. The implementation of the selected louver window model successfully reduces the CASV value from 13,42% to 10,56% while simultaneously decreasing turbulence levels inside the chicken house.
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