How low can the secondary chilled water (SCHW) temperature be without causing condensation?
A basis for deciding on a secondary chilled water temperature is to relate it to the room dew point temperature. In theory, a surface at room dew point temperature has the potential to condense water vapor from the air. At certain air conditions the air film on this surface will act as a layer of insulation, and allow the temperature of the surface to drop below the room dew point before condensation commences. The effectiveness of the air film depends on the velocity of the air and the fluid velocity with in the tubes. High air velocity over the coil and the low water velocity inside the tubes of the coil minimize the potential for coil sweating. This has the effect of reducing the “apparent room dew point temperature” by about 2-3°F. Therefore for a room dew point temperature of 55°F, a minimum secondary water temperature would be 53°F. We recommend, however, that the SCHW temperature be at or slightly above dew point to provide some safety and to mitigate the risk when room conditio
Related Questions
- Are there any problems with condensation with TermoDeck, especially in hot climates, as the supply air temperature could be as low as 13-14 degree C when entering the hollow core slab?
- How low can the secondary chilled water (SCHW) temperature be without causing condensation?
- What is the temperature of the chilled water that HSWAC will provide?
