Thermography is the ideal way to measure the proper functioning of a plant-floor heating and the correct temperature of the floor plant operation.
Below the image shows a room with a door area where the plant was not working.



The UNI EN 1264-2 establishes a limit to the maximum temperature of the floor in relation to the type of local:

Maximum temperature of the floor (° C)                Type of room / area                 29                                                      Area of usual residence                 33                                                      Bath or similar                 35                                                      Outskirts

Even with the UNI EN 15377-1 provides guidance on the temperature limit of the permitted floor with underfloor heating:

Surface temperature                 Maximum (°C)                Minimum (°C)
Floor – suburb                              35                                19
Floor – occupied                           29                                19

On the walls limit the maximum temperature can fluctuate between 35 ° C and 50 ° C with a recommended value of 40 ° C; attention is paid to the crowded environments, where people are more likely also stationed near the walls.

With regard to the problem of asymmetric radiant, UNI EN 15377-1 sets its maximum in 5 K, in agreement with the UNI EN 7730, according to which the maximum temperature on the floor must not exceed 29 ° C, and the differences temperature on the floor should not exceed 5 ° C.

In the thermal image temperature differences are of the order of 7-8 ° C, then the radiant asymmetry is greater than that permitted.

The maximum temperature of the floor is a constraint “physiological” introduced by legislation in order to avoid an excessive increase in the temperature of the floor which could lead to problems with blood flow to the individual.
Obviously a uniform distribution of temperature is more comfortable and economical.

When operating in the cooling of the floor you should consider the problem of surface condensation, which should never happen.