Solar water
heater uses energy from the sun to heat water and for this purpose solar
heating collector is needed which absorbs the
heat, and transfers it to where you need it. To do this efficiently, solar heating
collectors need to absorb and retain a large volume of sunlight every day. There
are two main technologies that have both been time tested. They are Solar Flat
Panels, and Solar Evacuated Tubes.Solar water heater has come a long way in the last decade, particularly with
the introduction of evacuated tube collectors that are rapidly becoming
the preferred option over flat plate systems. Below are listed few points
about collectors and how the way it is useful to human needs.
Flat-plate collectors
Flat-plate collectors have been on market for so many
years and are most time tested and well known technologies. Generally it
consists of a painted mental, such as copper attached
to copper pipes where water or a heat transfer liquid passes through This is
encased in a metal frame, surrounded by thick insulation to help retain the
collected heat, and protected by a sheet of glass or glazing, which also
provides an insulating air space.
Evacuated Tube collectors
Evacuated tube collectors are recently developed
technology on the market .There are several varieties of evacuated tubes, however the
most commonly used type employs the use of a heat pipe surrounded by a glass
tube that is under a vacuum. The
glass tube actually consists of two walls of glass. In between the two walls,
all the air is removed, resulting in a vacuum in the same manner as a clear
Thermos bottle would function. This vacuum is the best insulation and gives the
evacuated tubes a much better heat retention than air space.
Performance
Generally, evacuated tubes perform better in colder or
cloudier conditions than their flat panel counterparts. This is because of the
vacuum in the glass tube, which allows tube collectors to retain a high
percentage of collected heat. They work well in freezing conditions whereas
flat panels will not work as much as evacuated tube collectors.
Efficiency
When comparing Evacuated tubes and flat plates having
similar quality absorber plate coatings, this intersection typically occurs
when the inlet temperature exceeds the ambient by 90 to 100°F or more conditions
that most systems do not typically experience. However, it does mean that Evacuated
tubes collectors are capable of producing higher temperatures overall and can
produce more heat in cold weather.
Cost
Cost is often the primary consideration, especially if
performance is comparable. Flat plate collectors tend to be cheaper than evacuated
tubes because they are a simpler design and easier to manufacture. While the Evacuated tube cost may cost more, flat-plate collectors’ use
considerably more copper and can be subject to greater price fluctuations due
to resource prices.
Installation
Flat plat collectors are heavier, take up more room, and can be
cumbersome to install on certain roofs. Evacuated tubes tend to have lighter
components and are easier to manage on the roof. On the other side, evacuated
tubes tend to be more fragile than flat plates.
Summary
A correctly installed solar hot water system can start saving your
money straight away. Choosing of best type of collectors will save
electricity bills .Flat panel collectors are best for users in southern climates or for
northern seasonal homes only used during the summer. Evacuated tube collectors
are best for areas where winter temperatures frequently drop in the 40F range
or below. Customers needing hot water at higher temperatures in all climates
should consider evacuated tube collectors.
Glazer is one of the leading solar
water heater manufacturer
in India will provide high quality, corrosion resistant and warranted solar
water heaters with better heat storage. For more details visit http://www.glazerindia.com/industrial-solar-products.html
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