The stratification issue
The stratification phenomenon is one of most constraining factors in heating industrial premises.
We are all aware of it: air is warmer at the ceiling or at the top of an attic.
Warm air naturally tends to rise and heat is irremediably lost through the roof.
This stratification phenomenon is the more important that the outside temperature is lower.
In freezing weather, one often gets temperatures of 25 to 30°C at the rooftop, while at floor level the temperature is barely acceptable.
Hence, one may imagine the financial disaster caused by the calories escaping towards and through the roof.
Stratification losses through hot air heating
The hot air generator produces air with a temperature that carries it inevitably towards the ceiling.
The temperature of the air under the roof rises.
Hence, stratification is increased
Lowering the stratification through radiant heating
• With radiation, heating is remote by means of judiciously installed radiant heaters, without using the ambient air as heating carrier: air plays a passive part.
• With radiation, heating of the ambient air is limited and, hence, stratification is lessened.
• With radiation, heating can be concentrated on the occupied areas.
• Radiant temperature: a comfort temperature of for instance 18°C, which will be that of the objects and, hence, that of the human bodies subject to the radiation may very well be compatible with a lesser room temperature of some 15°C. The balance of 3°C is provided by the radiation component: 15°C ambient + 3°C= 18 °C (comfort T°: ambient air T° air + radiation T°).
We remember that radiant heating enables both zone and overall heating, while limiting the heating of the ambient air and, hence, the stratification.