AIR MOVEMENT
Reaching great heights
High ceilings are characteristic of a number of commercial and industrial premises, and as facilities managers and heating engineers will know, this presents a challenge when it comes to regulating temperature. Here, Alan Macklin, technical director at Elta Group and chairman of the Fan Manufacturer’s Association, explains how the latest destratifi cation technology can prove an invaluable asset.
T 26 July 2020
here are numerous types of premises and facilities that have high ceilings; from warehouses to retail, museums to factory fl oors, common across all of these is an inevitable battle for thermal comfort. This is because, as many will already know, hot air rises, leading to a concentration of heat far above where it is needed. To keep rooms at a temperature that avoids discomfort for building occupants, this can often mean heating the ceiling area to as much as 10°C-20°C more than the desired fl oor-level temperature. When you consider the extra energy expenditure this requires, it is important to look for alternative, more cost-eff ective means.
Stratifi cation is a natural process in which layers of air, increasing in temperature, build from fl oor to ceiling. It is the reason that the ceiling area of a tall room is invariably warmer than the bottom, as the lighter warm air rises above heavier, cooler air. Thermal destratifi cation mixes the internal air to prevent these layers from forming, to create a more uniform temperature across the full height of the room. By pushing hot air at the ceiling down towards ground level, this eff ectively circulates thermal energy to ensure the whole premises is a consistent temperature.
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