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Comparações emaranhadas: energias renováveis versus combustíveis fósseis
Por Norman Rogers via RealClearEnergy .
Muitas vezes nos dizem que a energia eólica e solar, se não mais baratas, são pelo menos competitivas em termos de custo com combustíveis fósseis. Completamente errado! A energia eólica ou solar custa cerca de cinco vezes mais por megawatt-hora em comparação com, por exemplo, o gás natural.
It may seem difficult at first, but everything is difficult at first.
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Because the spacecraft was designed to travel far from the Sun where solar panels are useless, it required a nuclear power source.
Key Features of the Power System
The Fuel: The system uses Plutonium-238 in the form of plutonium oxide.
Heat to Electricity: The natural radioactive decay of the plutonium generates heat. Thermocouples then convert this thermal energy directly into electricity.
The Units: Voyager 1 carries three RTGs, which are mounted together on a long boom to keep radiation away from the sensitive science instruments.
Initial Output: At launch in 1977, the three RTGs combined produced about 470 watts of power.
Current Power Status: due to the radioactive half-life of the plutonium and the degradation of the thermocouples. The power output decreases by about 4 watts every year
Because the spacecraft was designed to travel far from the Sun where solar panels are useless, it required a nuclear power source.
Key Features of the Power System
The Fuel: The system uses Plutonium-238 in the form of plutonium oxide.
Heat to Electricity: The natural radioactive decay of the plutonium generates heat. Thermocouples then convert this thermal energy directly into electricity.
The Units: Voyager 1 carries three RTGs, which are mounted together on a long boom to keep radiation away from the sensitive science instruments.
Initial Output: At launch in 1977, the three RTGs combined produced about 470 watts of power.
Current Power Status: due to the radioactive half-life of the plutonium and the degradation of the thermocouples. The power output decreases by about 4 watts every year