1. Agrartechnik Hohenheim 1 ASABE ILES VIII Brazil: September 1 st, 2008 1) 1)University of Hohenheim, Stuttgart, Germany 2)Cairo University, Giza, Egypt M. Samer 1), H. Grimm 1), M. Hatem 2), R. Doluschitz 1), T. Jungbluth 1) Spreadsheet Modeling to Size Dairy Sprinkler and Fan Cooling System

2. Agrartechnik Hohenheim 2 Contents 1. Introduction 2. Materials and Methods 4. Conclusions 3. Results and Discussion 3.2 Mathematical Model 3.3 Computer Software 3.1 Electronic Spark Map 3.4 Validation and Evaluation 5. Summary 6. Perspective

3. Agrartechnik Hohenheim 3 Introduction Skin and rectal temperature, and respiration rate of dairy cows increase with the increasing of the ambient temperature Therefore, installing a cooling system is highly recommended for dairy farms located in hot climates When the temperature exceeds the upper critical temperature (25 o C) a great degree loss in milk production occurs

4. Agrartechnik Hohenheim 4 Introduction Figure 2: Cooling system components (Harner et al., 1999) Figure 1: Typical sprinkler located over feed line (Harner et al., 1999) (a) Side View (b) Top View

5. Agrartechnik Hohenheim 5 Introduction Objectives The objective is to develop a mathematical model in order to: configure the microsprinklers and fans cooling system specify its engineering parameters, e.g. pump discharge & pressure calculate capital investment and fixed, variable, and total costs

6. Agrartechnik Hohenheim 6 An electronic spark map was developed using MS-Excel Materials and Methods A mathematical model was developed for designing cooling systems The mathematical model was then integrated into the spark map Model validation was carried out using data of 4 cooling systems COV and σ were calculated C# was used to develop a computer software

7. Agrartechnik Hohenheim 7 Using the mathematical model, the spark map calculates the following: o discharge and pressure of cooling system pump o length and diameter of cooling system pipelines o number of microsprinklers o number of cooling fans o costs of the configured cooling system Materials and Methods

8. Agrartechnik Hohenheim 8 Results and Discussion Electronic Spark Map Figure 3: Spark Map Engineerin g Parameters System Components Cost s

9. Agrartechnik Hohenheim 9 Results and Discussion Mathematical Model

10. Agrartechnik Hohenheim 10 Results and Discussion Mathematical Model

11. Agrartechnik Hohenheim 11 Results and Discussion Mathematical Model

12. Agrartechnik Hohenheim 12 Results and Discussion Mathematical Model

13. Agrartechnik Hohenheim 13 Results and Discussion Mathematical Model

14. Agrartechnik Hohenheim 14 Results and Discussion Computer Software Figure 4: Input data window of cooling system model

15. Agrartechnik Hohenheim 15 Results and Discussion Computer Software Figure 5: Output data window of cooling system model Figure 4: Input data window of cooling system model

16. Agrartechnik Hohenheim 16 COV ranges between 2.25% and 4.13% The system’s accuracy is 97.8% Results and Discussion Validation and Evaluation Table 1: Data of 4 cooling systems

17. Agrartechnik Hohenheim 17 The spark map can be then instantly used to make calculations, and to get automatically the results of the input settings Most mathematical models can be developed as spark maps in order to simplify their use for practical implementation Spark map (semi-automatic system) → back diagram code of the computer software (automatic system) Conclusions

18. Agrartechnik Hohenheim 18 Summary The mathematical model is then integrated into the spark map A mathematical model and a spark map were developed A computer software was developed using C# language Data of 4 cooling systems were used to carry out the model validation and evaluation

19. Agrartechnik Hohenheim 19 Perspective Additional sub-models were developed: Concrete Base Forage Storage Roof Materials & Structures Water Consumption and Sources Electricity Consumption and Sources Farm Planning Milking Parlor Constructions Manure Tanks The main models were developed: 1. Design Model 2. Costs Calculation Model Cooling System Biogas Plant Constructions Expert System Configuration

20. Agrartechnik Hohenheim 20 Thank You !