Installed in bypass.
|Max system volume:||30 m3|
|Flow through Elysator:||10-20 l/min|
Early underfloor heating systems used plastic pipes that were permeable to oxygen. Technology has since advanced to the point where it is now possi ble to produce underfloor hea ting pipes that are practically diffusion proof. Valves, threaded joints, circulating pumps, regulators, automatic bleed devices and faulty expansion tanks, however, are still potentially important sources of oxygen uptake. Oxygen diffusing into the heating water, too low a pH value and raised electrical conductivity of the system water can all lead to corrosion and blockage of the heating system from corrosion products. In the past, the most common method of corrosion protection was to add chemical corrosion inhibitors. In many cases, however, it was found impossible to provide active protection in cracks or under deposits of dirt or rust, so this approach could not deliver a satisfactory solution to the problem. Furthermore, it is costly and timeconsuming to monitor that the correct amounts of inhibitors are added. Using heat exchangers to separate the system into a heating circuit and hot-water circuit ultimately merely splits the problem into two parts without achieving active corrosion protection. Modern heating systems are more sensitive to signs of corrosion, limescale and any other deposits.
A reaction tank containing high purity magnesium anodes – the ELYSATOR - is installed in a bypass circuit of the heating system. The reaction with the sacrificial metal (magnesium), which goes into solution, reduces the concentration of atmospheric oxygen diffusing into the water to a negligible level. The magnesium hydroxide produced in this process helps to raise the pH value to an optimum range. Depending on the composition of the water in the system, its electrical conductivity then drops thanks to partial precipitation which reduces the water hardness. The result is alkaline water that is low in salts and has a minimum oxygen concentration. Corrosion damage is unlikely in systems containing water with these properties.
Material of vessel: Inox CrNiMo 1.4401
Insulation: Foam with coated metal sheet, CFC-free
Installation: in bypass
The (water) capacity of a heat storage tank, e.g. in solar installations, can be subtracted from the total volume of water to work out the ELYSATOR type required.
The function of the Elysator is based on the anodic/cathodic principle, i.e., letting a less noble metal (magnesium) be sacrificed (corroded)instead of the system itself, related to galvanic series/elements. During the process the oxygen in the water will be absorbed creating H2O and magnesium hydroxide. When the Elysator is installed, the entire system will be protected from corrosion. Even aluminium and aluminium alloys are protected.
Dilution of magnesium
Mg(s) → Mg2+(aq) + 2e-
½O2 + H2O + 2e- → 2OH-
Mg(s) + ½O2 + H2O → Mg (OH)2
1 - Cathode
2 - Anode
3 - Folow of electrons
4 - Meter/Check
5 - Potential difference for steel/magnesium
6 - Impurities filtered out by suitable circulation
Dissolved oxygen O2
- No chemicals
- Minimum maintenance
- Self regulating
- Kills and prevents growth of bacteria
- Savings in cost of chemicals and prevention of corrosion related failures
- Fast "Pay back"
- Improved water quality due to sludge and deposits removal
- Environmentally safe and meets ISO 1400 requirements
Typical values measured during the first month after installing the Elysator. On the engine cooling system of a 17 year old ship.
1. pH - Value
Corrosion is also due to acidic water. (low pH value, evaporated water normally holds a pH at aprox.5.5) The ELYSATOR system automatically regulates the pH value to approx. 9.5 (This is caused by splitting of magnesium hydroxide from the anodes).
2. Electrical Conductivity
100% pure water is non-conducting. It is important that electrical conductivity is kept as low as possible in order to avoid galvanic corrosion as well as to reduce the stress on pumps, gaskets, heat exchangers etc. The efficiency of the ELYSATOR is proportional to the conductivity, which means that the ELYSATOR is regulating itself in accordance to the condition in the water.
Major parts of the deposits are oxides of Fe (iron) and Cu (copper). They are both a result of corrosion due to an oxygen surplus, low pH or a galvanic current. The amount of dissolved copper is a measure for the ongoing corrosion process in your system. Through the ELYSATOR the water will be neutralised and metallic surfaces stabilised. Corrosion is therefore eliminated and the water stays clear, clean and without sediments. The deposit sludge is simply removed by daily draining of the Elysator.