Go Greener Tips

Posts Tagged ‘solar water’

From the operators of www.build-a-solar-panel.info — providing education regarding how to build a solar panel, green home tips, and green DIY projects.

Solar hot water heating systems are a basically simple design.  Solar collectors warm up water during the day, which is stored in an insulated container to keep it warm for ongoing use.  But icy temperatures can bring this kind of system to a standstill.  But new and improved methods have been developed that allow solar hot water systems to operate effectively even in cold climates.  Here is a basic depiction of how they work.

After a few decades of testing with solar hot water systems, most qualified users have decided that the closed loop design is the most successful for climates with freezing temperatures.   Because oxygen is eliminated from the system, pumps will not corrode and will have a greater lifespan, saving you time and money for upkeep and replacement parts.

The system is filled with an antifreeze blend (propylene glycol) at the time it is installed.  It then circulates between the solar collectors (where it is heated by the sun all through the day) and the storage tanks, which provide heat during the day and night.  There are several smaller components that allow the antifreeze to expand and contract, and which inhibit too much pressure from building up in the system, among other things.  But the solar collectors, the pump and the tank with heat exchanger are the central components.

Drainback systems are so named because the solar collectors drain when they are not being used.  Due to this, you can utilize either water or antifreeze in the system.  But for maximum assurance that the system will not freeze, people regularly choose to use antifreeze as an extra precaution, principally in regions that frequently experience temperatures below zero.  

A thermosiphon system also uses a detached solar collector, along with the pull of gravity. And it allows for the use of an insulated storage tank for more dependable hot water delivery. When using either of these systems in cold regions where freezing is an issue, both the piping and the storage tank should be placed indoors and suitably insulated to provide hot water even on the coldest days.

Even though the collectors drain when not in use, they drainback system is still a closed loop system. It needs a strong pump in order to return the drained liquid to the solar collector as soon as it has been drained.  But it is a first-rate choice for a homeowner who wants a solar heating system that is painless to maintain.

Solar hot water heating systems are relatively simple to install, easy to maintain and the most cost effective way to introduce your home to solar energy.  They can save considerable energy and cost when they replace an electric hot water heater.  And they can be successfully used even if you live in a climate where freezing temperatures are common during the winter.