VAV maximum and minimum airflow setting
VAV maximum and minimum airflow setting
(OP)
A space require supply air of 500l/s and its outdoor air requirement is 450l/s. If a VAV box is used for this space then maximum supply air setting of a VAV box is 500l/s and minimum airflow is set at 450l/s. How good is it to provide a VAV box with electric reheat coils in this case? The minimum airflow required to energize electric reheat coil is 450l/s in this case which is very close to 500l/s. please advice.





RE: VAV maximum and minimum airflow setting
MIN = 450 l/s = 950 CFM
You may have a high occupancy space? If so, add CO2 control. Then lower VAV MIN to meet heating load, or as low as 1/3 box max, whichever is greater.
knowledge is power
RE: VAV maximum and minimum airflow setting
RE: VAV maximum and minimum airflow setting
RE: VAV maximum and minimum airflow setting
RE: VAV maximum and minimum airflow setting
typically we add zonal motion sensor to bring the zones in a "standby" with wider deadband and no minimum flow. Because you can't predict when people leave their office, meeting room or come in later.
RE: VAV maximum and minimum airflow setting
how would your control work in case VAV in minimum and your space does not need heating.?