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. An expansion vessel consists of a trapped volume of pressurised air gas inside a steel vessel which contains a rubber bag or diaphragm. Sizing the appropriate sizing of an expansion vessel must be undertaken by qualified or appropriately trained engineers. Vp content of medium in the solar panels 4 l va content of water in the system vp volume in the pipes 20 l e medium expansion coefficient for glycol solutions 0 07 at 120 c and 30 glycol pvs safety relief valve setting. Kit expansion vessel solar plus 35l 10bar.

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. Eco expansion vessel for solar heating systems. Expansion vessel in a solar installation like every closed system in which a liquid s temperature changes a solar installation also needs an expansion vessel. The tank is partially filled with air whose compressibility cushions shock caused by water hammer and absorbs excess water pressure caused by thermal expansion.

An expansion tank or expansion vessel is a small tank used to protect closed not open to atmospheric pressure water heating systems and domestic hot water systems from excessive pressure. However there are some important differences between systems for solar and central heating systems with regard to the location of the expansion vessel and the calculation of. Heat 31 heat expansions vessels 31. The solar expansion tanks has a rubber membrane which separates the solar liquid loop and the other side is filled with pressurized air.

Although we can pump them up with a foot pump it is likely that the vessel will deflate again if the pressure has been lost before. Solar expansion vessels also known as expansion tanks are the most common source of failure in solar thermal solar water heating installations. 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. The appropriate size of vsg vessel is proportional to the main.

An expansion vessel must ensure the solar system can work safely particularly during periods when hot water is not being drawn off. This rubber bag referred to as a diaphragm contains. 130 c available in sizes 12ltr 18ltr 24ltr 35ltr and 50ltr. Installation maintenance guide 08 2012.