MSE Energy
MSE Energy
MSE Energy
Set of flashcards Details
| Flashcards | 329 |
|---|---|
| Language | English |
| Category | Technology |
| Level | University |
| Created / Updated | 06.04.2022 / 12.12.2022 |
| Weblink |
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13 Photovoltaic and biomass
why do we not concentrate sun on PV cells?
if you concentrate, then the PV cells heat up and this is bad for the cells (e.g. semiconductors), so you cool down the panels
13 Photovoltaic and biomass
decrease of solar radiation influences which parameter in PV cell?
voltage stays the same (cells in series), but less current when radiation decreases
13 Photovoltaic and biomass
PV cells setup, consequence
fixed angle => peak efficiency during the day and during the year
investment for tracking would be very high (usually higher than profit from increased efficiency)
13 Photovoltaic and biomass
advantages of PV cells
+ no emissions in electricity production
+ free *fuel*
+ safe in electricity production
+ provides a secure global energy source
+ can also produce with diffuse light, not only DNI
13 Photovoltaic and biomass
disadvantages of PV cells
- efficiency drops if T increases (from 24% at 0°C to 14% at 100%)
- => leads to overall reduced efficiency
- only a small portion of the sun energy can be captured and utilized
- difficult for large area energy provision (because large solar field needed)
- high costs for semi conductors and maintenance
13 Photovoltaic and biomass
definition of biomass energy
plant derived organic matter that is available on a renewable basis
bio mass recycles the CO2 from release
13 Photovoltaic and biomass
energy production by bio masses
burn to get steam for Rankine cycle (often very dirty (NOx and other pollutants)
convert to liquid fuel
capture methane for powering gas turbines
convert methane to heat
13 Photovoltaic and biomass
advantages of bio mass
+ reduces waste and odor (often partly Methane) from manure, => reduces CH4, a GHG
+ provides new markets for farmers and jobs in rural communities
+ for large and small scale possible
13 Photovoltaic and biomass
disadvantages of bio mass
- higher costs than for fossil fuels
- negative environmental impacts (eg NOx)
- photosynthesis to biomass has a very low efficiency (1 % of solar energy can be extraced by combustion of bio mass), even though this is usually not an issue, it will not solve our energy problems
- some regions are more fertile than others
