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Main » 2013 » September » 25 » Ways to Design a Solar Thermal Hot Water System by Glen Freeman
12:59 PM Ways to Design a Solar Thermal Hot Water System by Glen Freeman |
Ways to Design a Solar Thermal Hot Water System by Glen Freeman
Depending on
how much hot water you need, the hot water system you already have, your budget
and where you are located there are a few ways you can put a system together nfl jerseys. Below we outline some
of the system designs that you could implement.
Active "Direct" Open
Loop
In an active Direct open Loop System the water you use in your bath
and taps would be the same water that at one time would have been heated by the
sun in your solar panel (or other collector).
Colder water is taken from
your hot water cylinder and pumped (the active part) to the solar collector to
be heated. Hot water is then returned to the cylinder. In the UK to protect from
freezing we install a controller that will shut off the supply to to the
collector once the outside temperature drops to a certain level nfl jerseys cheap. You can click on
the picture to see a bigger picture of how this system fits together.
We
often recommend Active "Direct" Open Loop systems when customers are looking for
a simple or low cost solution. In many cases an Active "Direct" Open Loop system
can be installed using existing hot water stores and cylinders, most of the
existing pipework remains the same and these systems integrate nicely with
existing boilers.
Active Drain-Back System (with Water)
With an
active Drain Back system using water the temperature of the water in the
cylinder is monitored, once the temperature drops below a certain level water is
pumped up to the Solar Collectors to be warmed. When the water is not being used
it drains back into the system to avoid freezing.
Drain Back systems are
also popular due to their ease to install and simple design.
Active
"Indirect" Closed Loop (With Antifreeze/Glycol)
Active "Indirect" systems
use a dedicated loop to transfer a fluid such as Glycol between the Solar
Collector and the hot water storage cylinder. The fluid is heated up in the
collector, this heat is then transfered to the water in the cylinder via a heat
exchanger (often a heating coil similar to a heating element in a
kettle).
The second coil in this kind of system is used to transer heat
from other heating methods such as boilers and immersions when the Solar
Collectors aren't being used.
Active "Indirect" Closed Loop systems are
very popular in the UK but slightly more expensive then the direct systems as a
twin coil cylinder will need to be installed if you don't already have one and
there is more pipework post by haiyan151.
Passive Thermal
Siphon
This is where a water storage tank is placed higher then the solar
collectors to allow the heat captured by the collectors to rise into the tank
and warm the water. This is not a very efficient system but as it doesn't expend
any energy it may be useful in some situations.
Batch Heaters
This
is where the storage tank or cylinder is the collector, the water is warmed by
the sun as the cylinder warms up. With this type of system thought needs to be
given about what happens to the stored heat at night authentic nfl jerseys.
In
Summary
We hope this article has helped outline some of your options, has
explained some of the systems that are available and what could be implemented
in your Solar Thermal system.
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