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Is dehumidification required for a radiant cooling system to prevent condensation?

No, not if you have a control system designed specifically for radiant cooling systems like the Messana Control platform.


In a radiant cooling system, condensation can occur if the radiant surface temperature is lower than the dew point temperature.

Dew point

The dew point is the temperature at which air becomes saturated with moisture, leading to condensation.

To prevent condensation in a radiant cooling system, two key components are recommended:

  1. Humidity and temperature sensors (such as the Messana mSense) are used to evaluate the dew point in each room.These sensors help monitor the moisture levels and temperature, providing valuable data for controlling the system and avoiding conditions that could lead to condensation.
  2. A water mixing valve is essential for adjusting and maintaining the temperature of the radiant surfaces above the dew point.By regulating the flow of chilled water through the system, the mixing valve ensures that the surface temperatures remain above the dew point, preventing condensation from occurring.

By incorporating these components into the radiant cooling system, the risk of condensation can be minimized, ensuring optimal performance and comfort.


Furthermore, in certain scenarios, the incorporation of a greater radiant surface area, encompassing the floor and ceiling, can potentially obviate the need for dehumidification altogether.


Additionally, the integration of hydronic fan coils in conjunction with Messana controls provides a means of partial dehumidification.

  1. Comfort: Installing a dehumidifier in a radiant cooling system is recommended for improved comfort. By removing the latent heat from the spaces, a more comfortable environment can be created.
  2. Performance: Having a lower dew point through dehumidification can decrease the water supply temperature in the system, thereby adding extra capacity and improving performance.
  3. IAQ (Indoor Air Quality): When dehumidification is combined with mechanical ventilation, such as the Messana ATU (Air Treatment Unit), the air quality benefits from improved moisture control and circulation. 
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