Solar Expansion Vessel

The solar expansion tanks has a rubber membrane which separates the solar liquid loop and the other side is filled with pressurized air.

Solar expansion vessel.

Eco expansion vessel for solar heating systems. Most commonly expansion vessels are 18l or 25l in volume but we have serviced and installed much larger vessels. Do i need an expansion vessel in my solar system. 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.

Expansion vessels are an important part and safety device of your solar hot water system. 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. 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 consists of a trapped volume of pressurised air gas inside a steel vessel which contains a rubber bag or diaphragm.

Our solar expansion vessels are rated for a system operation temperature up to 120oc. 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. 130 c available in sizes 12ltr 18ltr 24ltr 35ltr and 50ltr.