Get Solar Water Heating » evacuated tube solar collector

Solar Collectors

justin — Tue, 06 Oct 2009 10:26:39 +0000

A solar collector is the device that is typically placed North facing on your roof which absorbs Sun light and converts it into heat. The heat produced by the solar collector is in turn used to heat the water inside your geyser.

There are various types of solar collectors on the market and the two most popular types are:

Evacuated tube collectors
Flat plate collectors

Evacuated tube collector

Demo of how hot evacuated tubes can get in just 30 minutes:

www.youtube.com/watch?v=xsx7BX0l5uQ

How evacuated tubes are manufactured:

www.youtube.com/watch?v=Z322o2X8upY

Flat plate collector

Demo of how flat late collectors are used in commercial systems.

www.youtube.com/watch?v=Xv1H5Q2yY94

Closely Coupled vs Split Systems

justin — Tue, 06 Oct 2009 13:48:06 +0000

Closely Coupled

Closely coupled systems are the solar water heating systems where both the tank (geyser) and solar collector are on the building’s roof. The tank is typically mounted horizontally above the solar collector. In some instances, the solar collector and tank are integrated to form one structure.

The water in a closely coupled system is heated by the solar collector and circulated into the tank using a principle called thermo-siphon. In short, thermo-siphon uses the property where hot water rises and cold water sinks.

Split Systems

Split solar water heating systems allow for the tank to be placed inside the roof – improving the aesthetics of the solution. Split solar water heating systems either use thermo-siphon or pumping to circulate the water within the solar water heating system.

Circulation Systems

justin — Tue, 06 Oct 2009 14:31:14 +0000

The water in a solar water heating system needs to be circulated for the system to work. Several methods are used to circulate the water within the system including pumps and the thermo-siphon principle.

Pumped / Active

Active solar water heating systems use a pump to circulate the water within the solar heating system.

One advantage of using a pumped system is that you can easily hide your geyser inside the roof to help improve aesthetics.

The pumps typically used in solar water heating systems are very quiet, draw very little electricity (less than 150 Watts) and are either driven by a solar controller or by a Solar PV panel.

Thermo-siphon

Thermo-siphon systems make use of the fact that hot water rises and cold water sinks. This is a great solution to circulating water within a solar water heating system where the storage tank (geyser) can be installed higher than the solar collector. The solar collector and tank typically need to be close to one another for the process to work efficiently.

Solar Water Heating | Domestic | Commercial | Industrial

justin — Fri, 09 Oct 2009 12:14:16 +0000

Solar water heating can be used in many different applications such as domestic hot water systems, commercial water heating systems, and industrial water heating systems. Solar water heating makes use of the sunlight received on earth during the day to heat the water. The hot water produced by a solar water heating system can be seen as ‘green’ as no carbon gases were emitted into the atmosphere in the process of generating the energy.

There are many different types and combinations of solar water heating systems on the market today. Some solar water heating systems use flat plat collectors, others use evacuated tubes solar collectors, some use solar pumps for circulation where other use a principle called thermo-siphon – where hot water rises and cold water sinks.

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Evacuated Tube Solar Collector

justin — Fri, 09 Oct 2009 12:23:03 +0000

An evacuated tube solar collector is comprised of various components:

Frame – typically made from aluminum
Manifold
Evacuated glass tubes – also known as heat pipes

Evacuated tubes can be used in many different configurations in a solar water heating system. In some systems, the water is does not flow through the tubes and in others it does. Some evacuated tubes have a copper pipe inside which is filled with alcohol which transfers the heat produced by the evacuated tube to the manifold where it is transferred to the water.

Evacuated tubes are known for their superb performance in European weather conditions as they are immune to wind chill. The vacuum inside the tube creates and insulating layer which prevents the evacuated tube solar collector from cooling when wind passes over it acting very much like a thermo-flask.

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