A Feasibility Study on Power Generation from Solar Thermal Wind Tower: Inclusive Impact Assessment Concerning Environmental and Economic Costs
Abstract
:1. Introduction
2. Methodology
2.1. STWT Design Principles and Output Power
2.1.1. Physical Model of STWT
2.1.2. Parameters
2.2. Environmental Impact: Life-Cycle Assessment
2.2.1. Materials and Weight Distribution
2.2.2. Carbon Footprint
2.3. Economic Aspect: Levelized Electricity Cost
2.3.1. Investment Cost
2.3.2. Levelized Electricity Cost
2.3.3. Parameters
2.4. Inclusive Impact: Triple I and Ecological Footprint
2.4.1. Ecological Footprint
2.4.2. Inclusive Impact Assessment Index (Triple I-light)
3. Results and Discussion
3.1. Calculations of Output Power and System Efficiency
3.2. Carbon Footprint
3.3. Levelized Electricity Cost
3.4. Ecological Footprint and Triple I Indexes
3.4.1. Total EF in the Life Cycle of the STWT System
3.4.2. Triple I Index
3.5. Comparison with Other Kinds of Power Generation Plants
4. Potential of Offshore STWT Technology
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Abbreviations
Area of collector | |
Annual energy production | |
Benefit | |
Cost | |
Total capital cost | |
Collector cost | |
Tower cost | |
Turbine cost | |
Specific capital cost for material and construction | |
Annual operation and maintenance cost | |
Specific heat capacity of air at constant pressure | |
Diameter of collector | |
Diameter of tower | |
Embodied carbon | |
Ecological footprint | |
Gross domestic product | |
Gravity | |
Height of tower | |
Height of collector inlet | |
Solar radiation | |
Inclusive impact index – light | |
Levelized electricity cost | |
Mass flow rate of air | |
Number of years (lifetime) | |
Total power | |
Electrical power output | |
Cost percentage for the collector per unit area. | |
Cost percentage for every one-meter height of collector inlet. | |
Cost percentage for the turbines. | |
Cost percentage for operation and maintenance | |
Useful heat gain to the air flow | |
Inputted solar energy | |
Capital recovery factor | |
Reinforced concrete | |
Annual interest rate | |
Solar thermal wind tower | |
Ambient air temperature | |
Maximum airflow speed | |
Total pressure difference of air | |
Temperature rise | |
Efficiency of the collector | |
Efficiency of the tower | |
Efficiency of the turbines | |
Density of the ambient air | |
Density of air inside the tower |
Appendix A
Component | Material | Percentage | |
---|---|---|---|
Turbines | Blade | Steel | 14% |
Epoxy | 29% | ||
Fibrous glass | 57% | ||
Nacelle | Steel | 93% | |
Stainless steel | 1% | ||
Cast steel | 7% | ||
Grease | 0% | ||
Generator | Steel | 66% | |
Silicon Steel plate | 8% | ||
Aluminum | 3% | ||
Copper | 6% | ||
Heat-hardening resin | 12% | ||
Grease | 6% |
Material | (kgCO2/kg) | Material | (kgCO2/kg) |
---|---|---|---|
Steel | 1.366 | Fibrous Glass | 2.138 |
Stainless steel | 2.744 | Insulator | 2.911 |
Cast steel | 3.718 | Grease | 0.255 |
Silicon steel plate | 1.366 | Heat-hardening resin | 5.035 |
Aluminum | 5.442 | Concrete | 0.114 |
Copper | 2.508 | Cement | 0.808 |
Epoxy | 6.886 | Stone material | 0.008 |
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Component | Weight (ton) | ||||
---|---|---|---|---|---|
5 MW | 50 MW | 100 MW | 200 MW | ||
Tower | 52,685.23 | 195,558.13 | 425,076.72 | 463,545.20 | |
Collector | 12,664.55 | 113,980.91 | 149,867.16 | 397,160.14 | |
Turbines | Blade | 201.60 | 201.60 | 201.60 | 201.6 |
Nacelle | 331.20 | 331.20 | 331.20 | 331.2 | |
Generator | 737.60 | 737.60 | 737.60 | 737.6 | |
Total | 66,620.18 | 310,809.44 | 576,214.28 | 861,975.75 |
Component | CO2 Emissions (tCO2) | ||||
---|---|---|---|---|---|
5 MW | 50 MW | 100 MW | 200 MW | ||
Tower | 15,805.57 | 58,667.44 | 127,523.02 | 139,063.56 | |
Collector | 6712.21 | 60,409.88 | 79,429.60 | 210,494.88 | |
Turbines | Total | 2601.58 | 2601.58 | 2601.58 | 2601.580 |
Blade | 684.94 | 684.94 | 684.94 | 684.940 | |
Nacelle | 506.89 | 506.89 | 506.89 | 506.893 | |
Generator | 1409.75 | 1409.75 | 1409.75 | 1409.746 | |
Total | 25,119.36 | 121,678.90 | 209,554.19 | 352,160.02 |
Transportation System | Railway | Ship | Truck/Lorry |
---|---|---|---|
CO2 emissions (kg/(kg·km)) | ≈30 | 10–100 | 75–220 |
Process | CO2 Emissions (tCO2) | |||
---|---|---|---|---|
5 MW | 50 MW | 100 MW | 200 MW | |
Transportation Stage | 8660.62 | 40,405.23 | 74,907.86 | 112,056.85 |
Construction Stage | 1507.16 | 7300.73 | 12,573.25 | 21,129.60 |
Operation and Maintenance | 9009.76 | 34,405.45 | 62,007.55 | 91,726.74 |
Capacity | 5 MW | 50 MW | 100 MW | 200 MW |
---|---|---|---|---|
Tower Height (m) | 550 | 750 | 1000 | 1000 |
Tower Diameter (m) | 45 | 90 | 110 | 120 |
Collector Diameter (m) | 1250 | 3750 | 4300 | 7000 |
Collector Area (km2) | 1.22 | 11.04 | 14.52 | 38.48 |
Electricity Output (GWh/Year) | 15 | 189 | 331 | 878 |
No. of typical households | 2813 | 34,524 | 60,526 | 160,398 |
Overall system efficiency (%) | 0.815 | 1.111 | 1.482 | 1.482 |
Capacity | 5 MW | 50 MW | 100 MW | 200 MW |
---|---|---|---|---|
Chimney cost [M€] | 5.4 | 20.0 | 43.4 | 47.3 |
Collector cost [M€] | 36.3 | 326.9 | 429.9 | 1139.1 |
Turbines cost [M€] | 4.2 | 34.7 | 47.3 | 118.6 |
Total capital cost [M€] | 45.9 | 381.6 | 520.6 | 1305.1 |
O&M cost [M€/year] | 0.2 | 1.9 | 2.6 | 6.5 |
AEP [kWh] | 1.54 × 107 | 1.89 × 108 | 3.31 × 108 | 8.78 × 108 |
LEC [€/kWh] | 0.2128 | 0.1443 | 0.1123 | 0.1062 |
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Elsayed, I.; Nishi, Y. A Feasibility Study on Power Generation from Solar Thermal Wind Tower: Inclusive Impact Assessment Concerning Environmental and Economic Costs. Energies 2018, 11, 3181. https://doi.org/10.3390/en11113181
Elsayed I, Nishi Y. A Feasibility Study on Power Generation from Solar Thermal Wind Tower: Inclusive Impact Assessment Concerning Environmental and Economic Costs. Energies. 2018; 11(11):3181. https://doi.org/10.3390/en11113181
Chicago/Turabian StyleElsayed, Islam, and Yoshiki Nishi. 2018. "A Feasibility Study on Power Generation from Solar Thermal Wind Tower: Inclusive Impact Assessment Concerning Environmental and Economic Costs" Energies 11, no. 11: 3181. https://doi.org/10.3390/en11113181