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KENMEC VIETNAM CO., LTD
Address: Thach That-Quoc Oai Industrial zone, Quoc Oai District, HaNoi city, VietNam
TEL: 84-4-33940868
FAX: 84-4-33940997
Email: kenmec@kenmec.com.vn
Website: www.kenmec.com.vn
Skype: vnfuchung/kmvn018
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Solar space heating
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Solar space heating
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Solar Space Heating |
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If you want to heat your home with solar
energy, you will need to decide whether you want an active or a passive
system. Although passive systems are popular because of their
simplicity, they are sometimes impractical to install (retrofit) in an
existing home, particularly if much of the site is shaded. Active
systems are often more practical for such applications. Choosing the proper
solar energy system depends on varying conditions such as the site, design, and
heating needs of the house. Although active systems are typically installed on
the roof, they can be ground or wall-mounted to take advantage of the availability
of solar radiation. You may prefer the aesthetics of a passive solar sunspace
instead of rooftop collectors. If you are unsure about what type of solar
energy system to install, contact a solar energy specialist or engineer. No
matter what system you choose, you should learn about it before making a
purchase. .
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How Much Heat Should Active Systems Provide? |
| Active solar energy systems are
usually designed to provide 40% to 80% of the home's heating needs.
Systems providing less than 40% of the heat needed for a home are rarely
cost-effective except when using air panels for walls, window boxes,
and other collectors that heat one room and require no heat storage. |
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| The size of the active system
helps determine how much heat it can provide. If you are planning to
purchase a system, you must determine how large your system should be.
Computer software is often used to properly size active systems. (For
information on solar computer software, contact the EREC.) | |
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Back-up Heating-A Supplement for Active Systems | |
| Most building codes
and mortgage lenders require a back-up heating system for houses heated with
solar energy. Back-up systems supply heat when, for example, there are long
periods of cloudy weather. Back-up systems range from a wood stove to a
conventional heating system. |
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Positioning Collectors to Perform Optimally |
| In general, the optimum
collector orientation is true south. True south is the highest apparent
point in the sky that the sun reaches during the day. (True south should
not be confused with magnetic south as indicated on a compass.)
Collector orientation may deviate up to 20° from true south without
significantly reducing the performance of the system. |
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Collectors should be tilted at an angle equal to your
latitude plus 15°. A collector receives the most solar radiation between
9:00 am and 3:00 pm. Trees, buildings, hills, or other obstructions
that shade collectors reduce their ability to collect solar radiation.
Even partial shading will affect performance and increase the payback
period of the system. You can position collectors in different
locations. Collectors usually receive the most sunlight when placed in
rows on the roof. In some cases, however, the roof may be too shady. If
the roof does not receive enough sunlight, you may want to mount the
collectors on a supporting structure on the ground, or in rows on the
south wall of the house, where there is enough sunlight for the
collectors to perform satisfactorily. Collectors mounted on the ground
or on an exterior wall perform almost as well as those mounted on most
roofs. | |
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Types of Active Heating Systems |
There are two basic types of
active solar heating systems. These are liquid or air systems, based on
the type of fluid heated in the collectors. Liquid systems use water or
an antifreeze solution to capture, transfer, and store heat produced by
"hydronic" collectors. Air systems use air to capture, transfer, store,
and distribute heat from the "air" collectors. Both of these systems
collect solar radiation, then distribute and store the heat that the
collectors produce. If the system storage cannot provide adequate space
heating, an auxiliary or back-up system provides the additional heat.
Not all systems store the heat that they collect; they immediately
distribute the heat for space heating. Liquid systems are more popular
than air systems because they cost less to operate and take up less
space.
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| Solar air systems distribute air at
slightly lower temperatures than modern heat pumps (around 95°F, 35°C).
Solar air systems use larger ducts to distribute the heated air than
conventional forced-air heating systems. The larger sized ducts allow
the air to move at a slower rate, making it feel warmer. (The air from a
solar air system feels cooler than it is, because moving air increases the evaporation rate on your skin. This is why a fan or a breeze feels cool to you.) |
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Depending upon your
needs and location, you may find the advantages of an air system outweigh its
disadvantages. Air collectors produce heat earlier and later in the day than
liquid systems. Air systems produce more usable energy over a heating season than
a liquid system of the same size. Also, unlike liquid systems, air systems do
not freeze, and minor leaks will not cause problems. Do not, however, ignore
leaks; they will usually affect the overall performance of the system. | |
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Need more ,Please contact us kenmec@kenmec.com.vn ,Thanks! |
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