- #1
cesiumfrog
- 2,010
- 5
Thermodynamics question: How much work can be obtained from sunlight?
It seems like a solar panel within the sun would not continuously generate electricity (else it could purely convert heat to work) but instead would emit as much black-body radiation as it absorbs. Back here the light is obviously more ordered: the photons only vary in direction by about a degree (rather than coming from all directions) and the frequency-to-density-ratio is much higher (far from thermal equilibrium for this region of space) but it's still less ordered than laser light (so seems improbable that even a perfect theoretical device could obtain 100% efficiency from sunlight). How would you go about calculating the maximum efficiency?
It seems like a solar panel within the sun would not continuously generate electricity (else it could purely convert heat to work) but instead would emit as much black-body radiation as it absorbs. Back here the light is obviously more ordered: the photons only vary in direction by about a degree (rather than coming from all directions) and the frequency-to-density-ratio is much higher (far from thermal equilibrium for this region of space) but it's still less ordered than laser light (so seems improbable that even a perfect theoretical device could obtain 100% efficiency from sunlight). How would you go about calculating the maximum efficiency?