How to Control Humidity in HVAC Application
How to Control Humidity in HVAC Application
(OP)
Hi
I want the control sequence to be used to control the Humidity in HVAC application.
Basically wht we do is as the Humidity goes above the setpt the Cooling is switched ON to squeze out the moisture from the air and the Heaters are used to ReHeat the air to bring it to required setpt.
But the problem is that when the Cooling is ON the temp is very low and the space is very cold.....im not able to find that perfect balance between the two.
Plz advice as to wht PID setting should be used for this application.
Khurram Shaikh
Application Engg.
I want the control sequence to be used to control the Humidity in HVAC application.
Basically wht we do is as the Humidity goes above the setpt the Cooling is switched ON to squeze out the moisture from the air and the Heaters are used to ReHeat the air to bring it to required setpt.
But the problem is that when the Cooling is ON the temp is very low and the space is very cold.....im not able to find that perfect balance between the two.
Plz advice as to wht PID setting should be used for this application.
Khurram Shaikh
Application Engg.





RE: How to Control Humidity in HVAC Application
As for the PID setting that’s hard to say depends on sensor placement cooling and heating size PID algorithm.
RE: How to Control Humidity in HVAC Application
Start from the space and work your way out. What are the temperature and humidity requirements for the space served? The control you mention is common and preferred in this application, so you're at the right starting point. The rest is sensor location and what control parameters you desire.
Normally, the space thermostat will provide the right amount of coil reheat to keep the space at the desired temperature. The humidity in the space will be good (only at the space temperature setpoint) with known desired conditions... Pls repost with further detail regarding the space requirements.
RE: How to Control Humidity in HVAC Application