Solar panels vs reflecting surface?

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Discussion Overview

The discussion revolves around the comparative effectiveness of solar panels versus reflective surfaces in reducing global heating. Participants explore the implications of using black solar panels, which absorb solar energy, versus white reflective surfaces that could potentially reflect solar energy back into space. The conversation touches on theoretical and practical aspects of energy efficiency, environmental impact, and maintenance considerations.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant suggests that while black solar panels have a 20% efficiency and can reduce CO2 emissions, they also contribute to local heating by absorbing solar energy.
  • Another participant argues that a reflective surface would be more beneficial for reducing global heating, proposing the idea of using white paint over large desert areas as a potential solution.
  • A different viewpoint questions whether installing PV panels is inherently better than simply painting surfaces white, noting the need for a significant area to be covered to make a meaningful impact.
  • Concerns are raised about the practicality of reflective surfaces in marine environments, highlighting potential issues with marine life coating reflective materials and the environmental implications of using antifoul paint.

Areas of Agreement / Disagreement

Participants express differing opinions on the effectiveness of solar panels versus reflective surfaces, with no consensus reached on which approach is superior for reducing global heating. The discussion remains unresolved regarding the best method to mitigate the effects of solar energy on global temperatures.

Contextual Notes

Participants acknowledge the need for maintenance of reflective surfaces and the challenges associated with implementing large-scale solutions. There are also assumptions about the efficiency of solar panels and the environmental impact of proposed solutions that remain unexamined.

Patrick Pihl
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Assuming that a black solar panel has an efficiency of 20%. This energy could be used instead of burning oil and decreasing CO2 emission. But the black color also accumulates a significant amount of the solar energy into heat locally on planet surface.

Comparing this with a white panel (non solar) that would reflect back a lot more solar energy into space. In a global perspective, what gives best effect in reducing global heating?/ Thanks
 
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A reflective surface is what you want - but you will need to put white reflectors (or mirrors) over a vast area of land in order to make a substantial hole in the net energy arriving here. I have often thought that loads of whit paint, all over the most desolate areas of desert, could perhaps make a difference to our situation. It would require maintenance, of course! ('Painting the Forth Bridge' pales into insignificance as an on-going project).
Houses should, of course, all have thermal and PV panels on all suitable surfaces. I see the UK's Green Deal has died a death. That could have made a real difference to us, locally if it had continued and been encouraged. Danged politicians again.
 
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PV panels are black or dark blue as far as I know so is it obvious that its better to put up a PV-panel compared to just paint the same surface white?
Yes one would need to brighten up a big area to make any difference :) Perhaps something that floats in the ocean water?
 
Last edited:
Patrick Pihl said:
Perhaps something that floats in the ocean water
Problem: within a few months, marine life forms would coat the reflective stuff and it would be 'brown'. A covering with a shiny biocide (antifoul paint) would bring the environmentalists down on you like a ton of bricks. :smile:
 
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