Even the slightest amounts of limescale reduce the heat transfer. This alone is an important factor for increasing energy costs. Severe limescale can even lead to local overheating of the metal resulting in the formation of cracks.
Also aggregates such as pumps are also loaded more. The cross–sectional constrictions of the pipe cause increased flow resistance within the pipe network (the kvs values increase). This leads to increasing energy and follow-up costs.
We would like to give you the following example to illustrate this case:
A limescale coating of 1.0 mm thickness reduces, for example, the heat transfer coefficients of plate heat exchangers or tubular heat exchangers by up to 80%. This leads to a reduction in heat transfer of up to 30%. Even a seemingly insignificant limescale coating of only 1 mm thickness can ultimately lead to a maximum of 12% higher energy costs.
Graphic 1 and 2: Energy loss due to limescale