jdmz
Mechanical
- May 16, 2019
- 16
We are adding a cooling coil to an existing commercial VAV AHU without supply air duct insulation. I am trying to calculate the minimum duct temperature that is allowable while avoiding condensation forming on the duct surface. The duct is exposed in the space and some of it is in a plenum but the system has plenum return so the air conditions should be close to what the room temperature is.
I understand there will be condensation if the duct surface temperature is at dew point temperature in the space. However, the only sources of outside air coming in the space are infiltration and the air introduced into the room from the duct (for example, near saturated 55 F air).
Thoughts? Raising the supply air temperature of the system also allows more moisture into the space which is why it's a bit confusing.
I understand there will be condensation if the duct surface temperature is at dew point temperature in the space. However, the only sources of outside air coming in the space are infiltration and the air introduced into the room from the duct (for example, near saturated 55 F air).
Thoughts? Raising the supply air temperature of the system also allows more moisture into the space which is why it's a bit confusing.