Title Page
Abstract
Contents
Chapter 1. Introduction 8
1.1. Problem statement and objectives of study 8
1.2. Research methodology 12
1.3. Organization of the thesis 14
Chapter 2. Literature review 15
2.1. Chiller load sharing 15
2.2. Integrated model 17
Chapter 3. Chiller model 20
3.1. Chiller 20
3.2. Coefficient of Performance 20
3.3. COP contour 23
3.4. Cooling water calculation model 25
Chapter 4. OAC model 27
4.1. OAC system 27
4.2. Water shower system & Valve model 28
4.3. Coil model 29
4.4. Fan model 34
4.5. Experiment cases 35
Chapter 5. Optimal control 37
5.1. Quantification of system COP 37
5.2. Case study 41
5.3. Comparative study between existing and optimal controls 45
Chapter 6. Conclusion 53
References 55
국문초록 61
Table 4.1. Experiment cases 36
Table 5.1. Results (Case 1): Outdoor air enthalpy is medium (60 kJ/kg) 42
Table 5.2. Results (Case 2): Outdoor air enthalpy is high (80 kJ/kg) 44
Figure 1.1. Water-cooled chiller system configuration 9
Figure 1.2. OAC systems 12
Figure 1.3. Research process 13
Figure 3.1. Chiller's COP contour 24
Figure 3.2. Condenser entering temperature 26
Figure 4.1. OAC system 28
Figure 4.2. Control valve 29
Figure 4.3. Part Dry & Part Wet 32
Figure 5.1. Chiller COP 40
Figure 5.2. Psychrometric chart (Case 1) 42
Figure 5.3. Psychrometric chart (Case 2) 44
Figure 5.4. Simulation results (Day 1) 48
Figure 5.5. Simulation results (Day 2) 52