- Technical Area
- University of comfort
Radiant systems have experienced rapid development thanks to their ability to provide high levels of heating comfort. Increasingly the market wants their same heating system to operate in summer as a cooler. The reasons are manifold. First of all, for reasons of comfort, since radiant transfer with a cold surface not too far off ambient temperature produces a sensation of personal comfort. Also, in comparison with air conditioning systems, there is minimal discomfort caused by mass movement of air or noise from fans. Finally, for energy considerations. The cold floor or cold ceiling uses water at a higher temperature than a traditional air system which means the device cooling the air (which can be an air-water heat pump) will be able to work more efficiently. A ceiling heating system is generally more efficient than a floor system due to the higher coefficient of convective heat transfer (see the section on Efficient Design). EN 1264 does not recommend adopting floor temperatures below 19°C, while this limit does not apply to ceilings. However, all radiant systems must be designed and adjusted based on the relative room humidity. The flow temperature of the water is therefore selected on the basis of the room‘s dew point, as described by the regulations. Since in summer it is common to have a high room humidity due to external conditions or people‘s activity, it is highly recommended to install an air dehumidification system if fitting a radiant cooling system, for reasons that will be explained later.