Modern heating generators are more sensible to signs of sediments, limescale and corrosion. High thermal loads and compact heat exchangers can generate higher surface temperatures and cause limescale deposits, which considerably decrease heat transfer: a limescale coating of 1.00 mm thickness reduces heat transfer efficiency by up to 30%. Furthermore, lime deposits will cause higher temperatures, leading to high voltages at the heating surfaces. Stress cracks could be the result. Also materials such as aluminium or stainless steel are extremely sensitive to corrosive fill water. All these factors may increase higher operating expenses. A limescale coating of 0.1 mm thickness can cause an increase in energy costs of 12%. In addition, limescale can damage the system components and cause unforeseen failures.
The technical guideline VDI 2035 Prevention of Damage in Water Heating Installations VDI 2035 has introduced comprehensive specifications, depending on the volume of filling water and the boiler scale, as well as technical measures for preventing scale formation, corrosion damage and deposits in closed heater circuits. Relevant parameters for scale formation are: total hardness and carbonate hardness of the water. Corrosion critically depends on the chemical composition of the feed water and refeeding water, in particular on the content of oxygen, pH value, electrical conductivity and water hardness. Continuous monitoring of the water quality is a necessary precondition for troublefree operation of your system.
Our devices Testomat 2000® and Testomat 808® for limit value monitoring in combination with the controllers Softmaster MMP2® and EcoControl EC Dos enable efficient conrol. Energy costs can be saved and down-times can be avoided.