Modeling automatic flow control valves

摘要

AUTOMATIC flow control valves (AFCVs) are used on HVAC hydronic systems to provide a fixed flow rate of chilled or hot water to various system loads. The proper operation of an HVAC system depends upon a consistent distribution of flow to all loads in the system under design conditions as well as under partial load conditions. AFCVs are unique in that they will provide a fixed rate of flow even when the differential pressure (dP) across the valve is varied. As long as the dP is within the working range of the AFCV, then the valve will typically supply a fixed flow rate to within ± 5% of the design flow.