VAV Thermal Comfort Issues
VAV Thermal Comfort Issues
(OP)
Hey All,
I'm troubleshooting an existing building where I have some internal and external zones where occupants are constantly complaining about being too cold. All Internal zones are fan powered boxes with no reheat, all external zones are fan powered boxes with hot water reheat. What are my options for increasing occupant comfort. The internal zones are more of a concern because I'm pretty limited in what I can do. Boxes are already set to minimum ventilation primary air so this cannot be reduced any further. Any troubleshooting tips would be helpful.
I'm troubleshooting an existing building where I have some internal and external zones where occupants are constantly complaining about being too cold. All Internal zones are fan powered boxes with no reheat, all external zones are fan powered boxes with hot water reheat. What are my options for increasing occupant comfort. The internal zones are more of a concern because I'm pretty limited in what I can do. Boxes are already set to minimum ventilation primary air so this cannot be reduced any further. Any troubleshooting tips would be helpful.





RE: VAV Thermal Comfort Issues
RE: VAV Thermal Comfort Issues
where do they draw air from? You maybe able to reduce the minimum flow setting. Most designs I 've seen don't calculate min. flow, they always use 30%. Obviously just using a rule of thumb is not good design.
In conference rooms you can use CO2 sensors to re-set minimum airflow. In most offices you can use motion sensors to reduce minimum flow to 0. All these will limit the amount of cold air going into spaces with little internal heat gain.
And implement discharge air temperature reset at AHU.
RE: VAV Thermal Comfort Issues
RE: VAV Thermal Comfort Issues
RE: VAV Thermal Comfort Issues
First we adjusted the air supply temp, but being located in a sub-tropical climate, it had a very detrimental effect on the humidity levels inside the property.
The we had to go with dehumidification cycles, which improved immensely the overall confort levels.
This strategy doesn't come cheap though because our electricity bills ramp up pretty fast.
RE: VAV Thermal Comfort Issues
RE: VAV Thermal Comfort Issues
RE: VAV Thermal Comfort Issues
RE: VAV Thermal Comfort Issues