New Renewable Technologies - Brief
Key:
light blue - wind energy
yellow - solar
darker shade of blue - HEP schemes
red - geothermal
- Created by: FenellaMae
- Created on: 14-11-19 20:22
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- How can new renewable technologies help future supply meet demand?
- Increase Efficiency
- multijunction PV solar cells have a maximum efficiency of 46% compared with single junction 27.6%
- this is because the multijunction cells have many layers of materials which absorb different wavelengths of light
- PV hybrid systems
- prevent the resistance of cells reaching levels which could reduce efficiency by absorbing the heat for space heating
- Kaplan turbines harness up to 90% kinetic energy of the water
- blades rotate to allow variations in flow rate - means that for energy to be converted, the minimum velocity is reduced
- blade-tip fins and nacelle brushes reduce air resistance
- multijunction PV solar cells have a maximum efficiency of 46% compared with single junction 27.6%
- Increase Energy Density
- parabolic reflectors - focus the light energy to one area
- helical VAWTs - curved blades rotate more smoothly
- absorption of energy is equalised across the blades so more is absorbed
- Reduce Cost
- direct drive turbines lack a gearbox - one of the most expensive components
- Storage Potential - Overcoming Intermittency
- solar thermal storage: use tanks of molten salt rather than water to store energy as these have a higher boiling point
- molten salt can store temperatures of 550C - water can be boiled to steam at any time
- solar thermal storage: use tanks of molten salt rather than water to store energy as these have a higher boiling point
- Reduce Locational Constraints
- low temperature fluids - using fluids that bill and turn turbines at lower temperatures
- butane or pentane boil at 60C - geothermal energy could be used in the UK
- Vertical Axis turbines (VAWTs) are driven by wind in any direction
- can be used in urban areas and where winds are turbulent
- also operate at lower wind velocities - wider range of areas available
- low temperature fluids - using fluids that bill and turn turbines at lower temperatures
- Increase Efficiency
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