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Title Page

Abstract

Contents

Chapter 1. Introduction 11

Chapter 2. Literature Review 14

2.1. Evaluating method for ventilation rate of livestock houses 14

2.2. Evaluation of ventilation rate according to static pressure difference 16

Chapter 3. Materials and Methods 19

3.1. Experimental broiler house 19

3.1.1. Ire broiler farm 19

3.1.2. Daeseon broiler farm 22

3.2. Fan performance curve 24

3.2. Orifice equation 26

3.3. Experimental instruments 28

3.4. Computational Fluid Dynamics (CFD) 29

3.5. Research method 30

3.5.1. Measurement of ventilation rate of Ire broiler house in winter condition 30

3.5.2. Measurement of ventilation characteristics in Daeseon broiler farm 31

3.5.3. Ventilation rate formula according to operating condition 36

3.5.4. CFD model design and validation 37

Chapter 4. Results and Discussion 41

4.1. Ventilation rate measurement in Ire broiler farm 41

4.2. Airflow measurement in Daeseon broiler farm 42

4.2.1. Measurement of environmental factors and ventilation characteristic 42

4.2.2. Evaluation of in-situ fan performance curve 44

4.2.3. Airflow decrease by windbreak 47

4.2.4. Evaluation of discharge coefficient of slot opening 49

4.3. Validation of CFD simulation model 53

4.4. CFD simulation result 58

4.4.1. Static pressure distribution 58

4.4.2. In-situ fan performance curve according to length of broiler house 61

4.5. Ventilation rate formula according to the operating condition 62

Chapter 5. Conclusion 67

Bibliography 69

국문초록 74

List of Tables

Table 1. Fan operation cycle according to ventilation level 21

Table 2. Technical specifications of manometer 28

Table 3. Technical specifications of temperature and humidity data logger 28

Table 4. Technical specifications of differential pressure transducer 29

Table 5. Experimental cases of airflow measurement of tunnel fan 34

Table 6. Airflow measurement of side fan in Ire broiler farm 41

Table 7. Range of measured airflow and static pressure according to the... 42

Table 8. Range of measured airflow and static pressure according to the slot... 43

Table 9. Regression analysis of in-situ fan performance curve with entire... 44

Table 10. Regression analysis of in-situ fan performance curve without outliers 44

Table 11. Airflow reduction of in-situ fan performance compared to design fan... 46

Table 12. Regression analysis of static pressure with airflow and windbreak... 47

Table 13. Regression analysis of in-situ fan performance curve with windbreak 48

Table 14. Airflow reduction due to windbreak compared to the design and in-... 49

Table 15. Result of regression analysis according to slot opening height for... 50

Table 16. Regression analysis of discharge coefficient with slot opening area 51

Table 17. Regression analysis of discharge coefficient with slot opening area... 53

Table 18. Agreement between measured and CFD simulated airflow and static... 54

Table 19. Regression analysis of static pressure difference with airflow and... 55

Table 20. Regression analysis of static pressure difference with airflow and... 57

Table 21. Regression analysis of in-situ fan performance curve with model... 62

Table 22. Minimum limits of slot opening height according to number of... 65

Table 23. Slot opening height range for adequate static pressure difference... 66

List of Figures

Fig. 1. External view of the Ire broiler farm 19

Fig. 2. Internal view of target broiler house in Ire broiler farm 20

Fig. 3. Schematic diagram of experimental broiler house 20

Fig. 4. Aerial photograph of Daeseon broiler farm 22

Fig. 5. Experimental Daeseon broiler farm 22

Fig. 6. Control system in Daeseon broiler farm 23

Fig. 7. Differential pressure transducer installed in Daeseon broiler farm 24

Fig. 8. Flow through an orifice 26

Fig. 9. Instruments for measuring air flow and velocity 29

Fig. 10. Measuring air flow of sidewall fan 31

Fig. 11. Controlling the number of operating tunnel fans 32

Fig. 12. Controlling slot opening height 33

Fig. 13. Estimated airflow and static pressure according to the slot opening... 34

Fig. 14. Location of operating tunnel fans according to the total number of... 35

Fig. 15. Airflow measurement according to the presence of windbreak 35

Fig. 16. Estimation of airflow and static pressure by fan performance curve... 36

Fig. 17. Geometry of Daeseon broiler farm CFD simulation model 38

Fig. 18. Design fan performance curve of target tunnel fan 39

Fig. 19. In-situ and design fan performance curve of target tunnel fan 45

Fig. 20. Dust accumulated on blades and shutters of target tunnel fan 47

Fig. 21. Design and in-situ fan performance curve according to the installation... 48

Fig. 22. Regression analysis of static pressure difference with airflow of slot... 50

Fig. 23. Schematic diagram and discharge coefficient according to the opening... 51

Fig. 24. Regression analysis of discharge coefficient with slot opening area 52

Fig. 25. Regression analysis of discharge coefficient with Reynolds number 53

Fig. 26. Scatter plot between measured and CFD simulated airflow 55

Fig. 27. Fan performance curve and CFD simulated in-situ fan performance 57

Fig. 28. Static pressure distribution near tunnel fans 58

Fig. 29. Static pressure distribution of the entire broiler house 59

Fig. 30. Comparison of design fan performance curve (at the fan) and in-situ... 60

Fig. 31. Simulated in-situ fan performance curve by CFD models with different... 61

Fig. 32. Estimated ventilation rate according to operating condition of broiler... 64

Fig. 33. Estimated average static pressure difference according to operating... 64

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