Each floor heating system must be subject to technical and thermal tests. Their purpose is to establish the relationship between the heating capacity and the maximum temperature of the floor surface (ℑpmax) and the difference between the average temperature of the heating medium and the air temperature in the room -> Δℑg = 0,5(t1+t2) – you. The results of such experiments are displayed in graphs called the family of characteristics. An example is the chart shown in the figure.

Characteristics of the heating floor (example). Marks: 1 - base characteristic, 2 -normal characteristic, 3 – limit curves.

The left part of the diagram shows the relationship between the heat output and the difference between the maximum floor temperature and the temperature in the heated room, being the so-called. the base characteristic of the underfloor heating system. The right part of the figure shows the relationship between the amount of heat released and the difference between the average temperature of the heating medium and the air temperature (Δℑg). This relationship is called the normal characteristic of the system in question. The tests are usually carried out in two stages. The first stage concerns measurements made without placing carpets on the floor. As a result, both characteristics are formed (base and normal). The second stage includes tests taking into account the thermal resistance of the linings (or carpets). They are the basis for determining t/w. limit curves, which are developed assuming a change in floor temperature within +29-35°C, The blue color line corresponds to the thermal resistance of the floor itself and its temperature, e.g.. +29°C, while the red line takes into account the resistance of the floor covering material and the floor temperature, e.g.. +35°C. The position of the lines is mainly influenced by the parameters of the heating water and the spacing of the heating cables. With a constant floor temperature, as the spacing increases, the differences between the temperatures of the heating water increase and the heat flow to the room decreases. The above chart is general in nature. Wall heating, ceilings and floors will be presented later in the study.