Cold-air lake

 

Radiators convey a warm air flow rising above the heating surface in the case of heating. Its propagation in space is usually influenced by the thermal effect of the window above it. Thermal effects of windows result from their low surface temperature and the inflow of fresh air through the window joints. The propagation of the warm air can therefore only be calculated to a limited extent.
The cold air conveyed by radiators during cooling will always remain in the floor area until it is heated up. The effect of a cold air lake is therefore directly connected to the entrapped heat sources.
 

The air flow generated by a cold heating surface is visualized in the video by smoke. The feeding of the cold air lake and the rising air flow on the warm clothing are clearly visible.
 

The video (16x speed) shows the air flow in front of the entrance door of an office. The door is located opposite the radiator. The thermal boundary layer approx. 50cm above the floor is clearly visible.
 
The results of a pilot test show that cooled radiators significantly reduce the room temperature below one meter. This temperature curve can also be detected at a significant distance from the radiator. The temperature gradient was described as very pleasant in non-representative surveys during the summer cooling period. On the other hand, an experimental cooling operation during the transition period occasionally led to feedback about too low temperatures in the foot area.
 
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