Power Generation Performance of Building-Integrated Photovoltaic Systems in a Zero Energy Building
Abstract
:1. Introduction
2. Overview of the Carbon Zero Building
3. BIPV Systems in the Carbon Zero Building
3.1. BIPV Systems
3.2. Monitoring System
4. BIPV System Performance Analysis
4.1. Data Analysis Period
4.2. Data Analysis Method
5. BIPV System Performance Results
5.1. Total Energy Production of the BIPV Systems
5.2. Comparison between Planned and Actual Energy Production of the BIPV Systems
5.3. Yields and Losses of the BIPV Systems
5.4. Efficiency Degradation of the BIPV Systems in the Carbon Zero Building
5.4.1. Efficiency Degradation of Horizontal BIPV Modules due to Dust Accumulation
5.4.2. Causes of Output Degradation of the Thin-Film Modules
5.5. Energy Production by BIPV Installation Angle
6. Conclusions
- (1)
- Based on simulations, the energy production of the BIPV systems in the Carbon Zero Building was predicted to be 975.2 kWh/kWp. The monitoring results for the five-year period, however, showed that the average annual energy production per kWp was 855.6 kWh/kWp, which was 12.26% lower than the predicted value.
- (2)
- After analyzing the causes of degradation in the measured energy production, it was concluded that the system losses by inverter, which ranged from 0.14 to 0.31 h/d, indicated no significant difference between inverters. Conversely, the capture losses ranged from 0.21 to 1.81 h/d, indicating significant differences.
- (3)
- The primary cause of the increase in capture losses was a temporary decrease in the power generation efficiency of the horizontally installed modules due to dust accumulation on the front of the PV modules, which was subsequently removed by precipitation.
- (4)
- The second cause of the increase in capture losses was the fact that the inverters installed in the Carbon Zero Building could not consider the control characteristics of the amorphous modules, leading to a significant decrease in energy production because the same inverters were used for both crystal system modules and amorphous modules.
- (5)
- Therefore, the BIPV systems with an inclination angle of 30° exhibited approximately 57% higher energy production than the vertically (90°) installed systems under the same solar radiation. Furthermore, the horizontal (0°) BIPV systems exhibited up to 14% higher energy production than the vertical BIPV systems.
Author Contributions
Funding
Conflicts of Interest
List of Symbols
YA | Array yield [h/d] |
YF | Final yield [h/d] |
YR | Reference yield [h/d] |
EDC | Array DC energy output per year [kWh/year] |
EAC | AC energy output to the grid per year [kWh/year] |
GI | Reference irradiation (1000 W/m2) |
HId | Total in-plane irradiation per year [kWh/m2/year] |
LC | Capture loss [h/d] |
LS | System loss [h/d] |
RR | Performance ratio [%] |
NE | Reference array efficiency [%] |
A | Area of array [m2] |
Ntotal | Overall system efficiency [%] |
TFE | Total facility energy use [kWh/month] |
FEL | Facility total energy load met by photovoltaic (PV) production [kWh/month] |
Po | Installed capacity [kWp] |
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Floor | Facility | Use | Area (m2) |
---|---|---|---|
Underground floor | Public facility | Machine room, electricity room, generator room, control room | 521.6 |
1st floor | Promotion facility | Exhibition room | 280.7 |
International conference room | 431.4 | ||
Information room, situation room | 18.0 | ||
Warehouse | 11.3 | ||
Public facility | Rest room | 22.6 | |
Hall | 138.3 | ||
EV | 28.3 | ||
Wind-proof room | |||
2nd floor | Research facility | Laboratory | 412.1 |
Data center | 42.7 | ||
Large meeting room | 92.0 | ||
Small meeting room | 22.8 | ||
Data storage room | 56.1 | ||
Lounges (male and female) | 30.4 | ||
Public facility | Rest room | 22.6 | |
Hall | 153.6 | ||
EV | 164.9 | ||
Hallway | |||
Staircase | |||
Total floor area | 2449.2 |
Type | Polycrystal | Amorphous | |||
---|---|---|---|---|---|
Voc | 7.6 | 25.5 | 30.6 | 34.5 | 91.8 |
Vmp | 5.3 | 17.8 | 21 | 26.1 | 66 |
Isc | 8.92 | 8.92 | 8.92 | 8.92 | 1.09 |
Imo | 8.17 | 8.17 | 8.17 | 8.17 | 0.75 |
Efficiency (%) | 8.32 | 8.14 | 9.77 | 11.65 | 5.3 |
Capacity (W) | 43 | 145 | 171 | 213 | 50 |
Number of photovoltaic (PV) Cells | 12 | 40 | 48 | 54 | - |
Module quantity | 32 | 590 | 37 | 76 | 136 |
Inverter Number | Module Type | Tilt Angles | Module Area (m2) | Module Capacity (Wp) | Module Quantity | Total Area (m2) | Total Capacity (kWp) | Inverter Capacity (kWp) |
---|---|---|---|---|---|---|---|---|
INV_1 | Glass to Glass | 90 | 1.84 | 171 | 12 | 22.08 | 2.052 | 3 |
INV_2 | 90 | 1.84 | 171 | 12 | 22.08 | 2.052 | 3 | |
INV_3 | 90 | 1.84 | 171 | 13 | 23.92 | 2.223 | 3 | |
INV_4 | 90 | 1.77 | 213 | 10 | 17.7 | 2.13 | 3 | |
INV_5 | Glass to Glass | 0 | 1.41 | 145 | 18 | 25.38 | 2.61 | 3 |
INV_6 | 0 | 1.41 | 145 | 18 | 25.38 | 2.61 | 3 | |
INV_7 | Glass to Tedlar/crystal | 30 | 1.41 | 145 | 16 | 22.56 | 2.32 | 3 |
INV_8 | Tracking | 0.53 | 43 | 32 | 16.96 | 1.376 | 3 | |
INV_9 | Amorphous | 0 | 0.93 | 50 | 32 | 29.76 | 1.6 | 3 |
INV_10 | 90 | 0.93 | 50 | 52 | 48.36 | 2.6 | 3 | |
INV_11 | 90 | 0.93 | 50 | 52 | 48.36 | 2.6 | 3 | |
INV_12 | Glass to Tedlar/crystal | 30 | 1.41 | 145 | 70 | 98.7 | 10.15 | 11 |
INV_13 | 90 | 1.77 | 213 | 66 | 116.82 | 14.058 | 15 | |
INV_14 | Glass to Glass | 90 | 1.41 | 145 | 160 | 225.6 | 23.2 | 25 |
INV_15 | 0 | 1.41 | 145 | 308 | 434.28 | 44.66 | 45 | |
Total | - | - | - | - | 871 | 1177.94 | 116.241 | 129 |
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Choi, W.J.; Joo, H.J.; Park, J.-W.; Kim, S.-k.; Lee, J.-B. Power Generation Performance of Building-Integrated Photovoltaic Systems in a Zero Energy Building. Energies 2019, 12, 2471. https://doi.org/10.3390/en12132471
Choi WJ, Joo HJ, Park J-W, Kim S-k, Lee J-B. Power Generation Performance of Building-Integrated Photovoltaic Systems in a Zero Energy Building. Energies. 2019; 12(13):2471. https://doi.org/10.3390/en12132471
Chicago/Turabian StyleChoi, Won Jun, Hong Jin Joo, Jae-Wan Park, Sang-kyun Kim, and Jae-Bum Lee. 2019. "Power Generation Performance of Building-Integrated Photovoltaic Systems in a Zero Energy Building" Energies 12, no. 13: 2471. https://doi.org/10.3390/en12132471