Solar thermal

The simplest solar power technology is a panel making hot water. Let's imagine we cover all south-facing roofs with solar thermal panels - that

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would be about 10 m2 of panels per person - and let's assume these are 50%-efficient at turning the sunlight's 110 W/m2 into hot water (figure 6.3). Multiplying

50% x 10 m2 x 110 W/m2 we find solar heating could deliver

13 kWh per day per person.

I colour this production box white in figure 6.4 to indicate that it describes production of low-grade energy - hot water is not as valuable as the highgrade electrical energy that wind turbines produce. Heat can't be exported to the electricity grid. If you don't need it, then it's wasted. We should bear in mind that much of this captured heat would not be in the right place. In cities, where many people live, residential accommodation has less roof area per person than the national average. Furthermore, this power would be delivered non-uniformly through the year.

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Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

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