E+ calculates dew point temperature internally. You can calculate the zone dew point temp from zone W using this formula.
Output:Variable, ZoneName, System Node Humidity Ratio, detailed;
Output:Variable, OutdoorNodeName, System Node Pressure, detailed;
. . WW = humidity ratio (kg/kg)
Pb = 101325.0 !- barometric pressure (Pa), use outdoor pressure
RR = Pb*WW/(0.62198+WW) !- RR is temporary variable since this is long equation
RR = LN(RR) !- natural logarithm of RR
DDP = (-35.957-1.8726*RR+1.1689*RR**2) !- dew point (C)
On 8/1/2011 7:31 AM, Jean marais wrote:
Hi All, When I run certain scenarios with my chilled ceiling, I get this niffty error, which gives the room dew-point when the ceiling is deactivated due to condensation. I looked for a variable like this in the rdd file, but don't find it. Can one output this zone dew-point?
** Warning ** Surface temperature below dew-point temperature--potential for condensation exists
** ~~~ ** Flow to the following radiant system will be shut-off to avoid condensation
** ~~~ ** Hydronic Radiant System Name = PIERW%E03:PIERW%E03 RF
** ~~~ ** Predicted radiant system surface temperature = 16.83
** ~~~ ** Zone dew-point temperature= 16.84
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