Evacuated Tubes | Solar Thermal | Products | The Greener Home Store | Malahide, County Dublin

By: Greener Home Store  05/12/2011
Keywords: solar panels, Water Heating, heating system

Solar / Thermal

Evacuated Tubes

Our Solar Evacuated Tube Collectors are ideal for supplying domestic hot water as well as heating swimming pools. CareyGlass Solar tubes ensure a long service life by application of high-quality, corrosion proof materials. Furthermore, the panels guarantee high energy yields with their small collector gross areas.

Due to the circular absorber area, each individual tube always has the optimal adjustment towards the sun, this in turn ensures that both direct and diffuse solar radiation is optimally collected by the circular absorber. In case of a tube breaking it is possible to exchange tubes without emptying the collector unit of the solar fluid. Unused surplus in summer is lower than with a flat-panel collector, whereas the gains in winter are higher.

Useful Design Points for Solar Evacuated Tube Collector

For a solar thermal system to work to its optimum capacity a south facing roof is ideal. However, it is still possible to install a solar water heating system if your home has an east-west orientation by increasing the area of panel installed. One option is to mount one panel on the east orientation to collect heat in the morning, with another panel on the west orientation to collect the heat in the afternoon. It is not advisable to place solar panels on a north-facing roof.

In addition, this roof area cannot be overshaded by nearby buildings, trees or other objects. The panel should be placed at an angle between 25° to 60°. The variety of installation methods ensures that almost any type of building can have a solar thermal system installed.

Installation Methods for Solar Evacuated Tube Collectors

Our evacuated tubes are suitable for pitch roof and flat roof mounting as well as free standing mounting and facade assembly.The tubes however can not be integrated into a roof; they are always fitted once the roof is completed.

Technical Specification for Solar Evacuated Tube Collectors

The CareyGlass Solar evacuated tube consists of 3 main components: evacuated tubes, CPC mirrors and collecting box with heat transfer unit

The evacuated tubes

The evacuated tubes are composed of two glass tubes which in each case are half spherically closed on one side and fused together on the other side. The gab between the tubes is evacuated. In addition, the internal glass tube is provided with on its external surface with a highly selective layer and thus designed as an absorber. It is an aluminum nitrite sputter layer which is characterized by very low emission and very good absorption.

The CPC mirror

In order to increase the efficiency of the evacuated tube, a highly reflective, weather proof CPC mirror (Compound Parabolic Concentrator) is placed behind the evacuated tubes. The special mirror geometry ensures that even at unfavourable irradiation angles direct and diffuse sunlight falls onto the absorber. This substantially improves the energy yield of a solar collector.

Collecting box and heat transfer unit

The insulated collecting and distribution pipes are located inside the collecting box.In all systems the solar circuit is a closed loop and does not contain the water that you use. Instead the water is pumped around the circuit absorbing heat in the solar panel and transferring it to the water in the hot water cylinder

Keywords: Flat Roof, heating system, hot water, solar panels, solar water heating, Solar Water Heating System, Thermal System, Water Heating, Water Heating System

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