Solar Expansion Vessel

The expansion vessel in a solar hot water system has to be able to operate at higher temperatures than those a standard heating vessel are subjected to.

Solar expansion vessel. As the liquid heats up and expands the pressure of the system increase to an amount greater than the air pressure inside the expansion vessel and causes the membrane to take up more liquid to the air side. Most commonly expansion vessels are 18l or 25l in volume but we have serviced and installed much larger vessels. Expansion vessels are an important part and safety device of your solar hot water system. During this period modern solar collectors may reach temperatures up to 200 c and consequently the fluid within the system can either evaporate or reach levels that can damage all the components within the solar energy system over time.

An expansion vessel must ensure the solar system can work safely particularly during periods when hot water is not being drawn off. Solar expansion vessels need to be sized correctly for your system. Eco expansion vessel for solar heating systems. Our solar expansion vessels are rated for a system operation temperature up to 120oc.

An expansion vessel consists of a trapped volume of pressurised air gas inside a steel vessel which contains a rubber bag or diaphragm. Altecnic s range of solar expansion vessels are specifically designed for renewables applications where high temperatures can normally be reached and where depending on the kind of system glycol can be present. This rubber bag referred to as a diaphragm contains.