Title Page
ABSTRACT
국문 초록
PREFACE
Contents
NOMENCLATURE 18
CHAPTER 1. INTRODUCTION 24
1.1. Background 24
1.2. Literature review 26
1.2.1. Dehumidification load and energy recovery performance 26
1.2.2. Optimization and control strategies 30
1.3. Objectives of this study 33
CHAPTER 2. METHOD 35
2.1. System description 35
2.2. Field measurement 37
2.2.1. Building and system information 37
2.2.2. Data reduction 47
2.3. Building energy simulation 53
2.3.1. Building load 55
2.3.2. System component modeling 61
2.3.3. Calculation algorithm 63
2.4. Economic analysis 67
CHAPTER 3. PERFORMANCE CHARACTERISTICS OF INTEGRATED ENERGY RECOVERY VENTILATOR WITH AIR CONDITIONER 69
3.1. Introduction 69
3.2. Results and discussion 70
3.2.1. Performance comparison between ERV and ERV-CC 70
3.2.2. Thermal comfort 83
3.2.3. Energy efficiency 87
3.3. Summary 91
CHAPTER 4. CONTROL OPTIMIZATION OF INTEGRATED ENERGY RECOVERY VENTILATOR SYSTEM WITH AIR CONDITIONER 92
4.1. Introduction 92
4.2. Results and discussion 93
4.2.1. Simulation validation 93
4.2.2. Climatic conditions and building loads 99
4.2.3. Limitation of ERV performance 103
4.2.4. Control strategies for ERV-CC 107
4.2.5. Energy savings and thermal comfort 119
4.2.6. Life-cycle cost and payback period 127
4.3. Summary 129
CHAPTER 5. CONCLUDING REMARKS 130
5.1. Conclusions 130
5.2. Future works 132
REFERENCES 135
Table 1.1. Review of studies on ERV systems. 29
Table 2.1. Building and system specifications. 38
Table 2.2. Specifications of field measuring instruments. 44
Table 2.3. List of experimental cases. 46
Table 2.4. Uncertainty analysis. 52
Table 2.5. Information used for LCC calculation. 68
Table 3.1. Operating condition factor analysis. 77
Table 4.1. Error analysis on indoor conditions. 96
Table 4.2. Error analysis on energy consumption. 98
Table 4.3. Control strategies of the ERV-CC system. 118
Table 4.4. Comparison of energy performance and thermal comfort under various control strategies. 126
Fig. 2.1. Schematic of the tested air conditioner and ERV-CC system. 36
Fig. 2.2. Schematic of the internal moisture generation system. 40
Fig. 2.3. Floor plan and layout of the field study building. 42
Fig. 2.4. Lines of constant H* at room return air conditions of 24 ℃ dry-bulb temperature and 50% relative humidity. 50
Fig. 2.5. Energy balance on building (a) zone-level and (b) element-level. 58
Fig. 2.6. Moisture balance on building thermal zone. 60
Fig. 2.7. Flow chart for the sensible energy calculation. 64
Fig. 2.8. Flow chart for the latent energy calculation. 66
Fig. 3.1. Comparison of (a) indoor air temperatures and (b) relative humidities of ERV-CC and ERV systems. 71
Fig. 3.2. Comparison of (a) sensible and (b) latent RERs between ERV-CC and ERV systems. 74
Fig. 3.3. Variations in operating condition factor (H*) in a day. 76
Fig. 3.4. Air handling processes at low OA temperatures during the cooling season. 79
Fig. 3.5. Outdoor conditions required for reducing the dehumidification load by employing the ventilation systems. 82
Fig. 3.6. Indoor conditions under various set-point temperatures and relative humidities. 84
Fig. 3.7. Predicted percentage dissatisfied (PPD) at different operating conditions. 86
Fig. 3.8. Energy consumption values under different operating conditions. 88
Fig. 3.9. Variations in combined efficiencies (CEFcooling) in relation to outdoor enthalpy.[이미지참조] 90
Fig. 4.1. Comparison of (a) temperature and (b) humidity variations between predicted and measured data. 94
Fig. 4.2. Outdoor temperature and humidity during the cooling season. 100
Fig. 4.3. Building sensible and latent loads during the cooling season. 102
Fig. 4.4. Outdoor and return air conditions for the ERV system categorized based on the summer comfort zone. 104
Fig. 4.5. Percentage of outdoor conditions for the ERV system that satisfied the indoor thermal comfort criterion during the cooling season. 106
Fig. 4.6. Comparison of (a) sensible and (b) latent heat between building cooling load and CC capacity. 108
Fig. 4.7. Flow chart for the CM1+2. 110
Fig. 4.8. Variations in air conditioner sensible heat ratios and energy consumption in relation to indoor relative humidity. 112
Fig. 4.9. Variations in energy consumption and energy saving rates in relation to (a) outdoor temperature and (b) humidity ratio. 114
Fig. 4.10. Flow chart for the CM1+3. 116
Fig. 4.11. Energy saving rates and PPD values under various control strategies. 121
Fig. 4.12. Flow chart for the CM1+2+3. 123
Fig. 4.13. Energy saving rates and PPD values under CM1+2+3. 125
Fig. 4.14. Life-cycle cost (LCC) and payback period (PP) under various control strategies. 128