Solar Water Heater-How It Works (2)

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Remember that we are discussing this topic, Solar Water Heater-How It Works, in honor of Ed Begley Jr.. The use of solar water heaters to heat water had a long history in countries/regions where sunlight is readily available.  As a matter of fact, in US, the first solar water heater dates back to 1890s.  By 1920, tens of thousands of solar water heaters were sold in US. However, the use of solar water heaters dwindled once the cheaper fossil fuels became available.  Yes, that was a different time in history and solar water heaters have again made a comeback in US and elsewhere  now that the cost of fossil fuel has gone up. Let’s look at some data/pie chart from 2007 at right   (click on the pie chart would give you a higher resolution view).

new solar hot water installations during 2007

There are mainly two types of solar water heaters:

  1. Active solar water heating systems: where pumps enable the flow of water through the solar water heating systems.
  2. Passive solar water heating systems: where most of the circulation of water occurs naturally, therefore no pump is use

(A) Passive CHS (Convection Heat Storage/thermosiphon)system with tank above collector. (B) Active system with pump and controller driven by a photovoltaic panel

Active systems can tolerate higher water temperatures than in equivalent passive systems, but active systems are often more efficient, more complex, more expensive, and more difficult to install than passive systems and rely on either mains or PV sourced electricity to run the pump and controller.

Since no body ever remembers a long winded speech (as Dale Carnegie once commented)….so let’s keep this one short also.

More of the solar water heater will be discussed in my next post. Stay tuned in at the same bat channel, sunisthefuture.net

Until then, I bid you well~

sunisthefuture-Susan Sun Nunamaker
Homepage: http://sunisthefuture.net http://sunisthefuture.com http://sunisthefuture.org

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