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Renew your home with solar and wind

Solar hot water heating. Croteau calls this “a really tried and true” technology that can supply about half your water heating year-round. You don’t need to replace your current water heater. Just add another 80- to 100-gallon electric water tank to store the solar-heated water and connect it to your current heater where cold city water normally goes in. Less power will be required to keep your water hot as a result. Antifreeze flows through the solar collector and transfers its heat to the water in the storage tank via a heat exchanger. For easier maintenance, the heat exchanger can be mounted on the wall above the tanks with two small pumps. One pump circulates cold city water to the heat exchanger for warming and then into the storage tank, and in a separate loop, the other pumps antifreeze through the solar collector and down to the heat exchanger. If you don’t get enough sun on your roof, you can put collectors on the ground or on an awning with this system.

If you can put a collector on your roof, a more efficient option is to let the fluid fall back down into the storage tank at night or whenever the pump shuts off. This so-called drainback system requires the least maintenance of any solar hot water design, typically running 20 years with no service.

With two flat plate solar collectors (enough for a family of four), a solar hot water system would cost anywhere from $2,500 to $4,000, including installation. Croteau estimates the system will pay for itself in 5 to 10 years.

A recent addition to the market is evacuated tube collectors, which are more efficient than flat plate collectors. Instead of copper tubes running across a flat plate that absorbs the sun’s heat, the fluid lines are surrounded by a vacuum, resulting in virtually no heat loss. They can heat fluids to higher temperatures than flat plate collectors, and any excess solar energy can be easily applied to heating bathroom and kitchen floors in winter. Evacuated tube technology performs better in cold weather than flat plate, so would be an advantage in Illinois winters. A two-panel system using evacuated tube technology costs $5,000 to $6,000.

Of course, costs would be lower if you can get by with one panel rather than two. Low-flow showerheads and lather valves that pause the water while soaping and shampooing can cut water usage in half, Croteau notes.
 
 
 
 
 
 
 

Author: Zhejiang Haining Tiange Solar Energy Science Technology Co., Ltd.
Website:http://www.sunnyrainsolar.com/
Main Product::Solar energy,Solar water heater,Solar collectors

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