Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The "Fan Pressure Rise Curve" must be modified in tandem with the "Duct Static Pressure Reset Curve" in the Fan:ComponentModel object in order to open the VAV dampers more and run the fan at a lower pressure, thereby consuming less energy.
The "Duct Static Pressure Reset Curve" takes as input flow the m3/s flowing through the ducts and outputs the desired duct pressure at that flow.
The "Fan Pressure Rise Curve" takes as input the flow and "Duct Static Pressure Reset Curve" output. The four terms in the "Fan Pressure Rise Curve" represent different sources of resistance in a duct system model including, but not limited to, the return duct resistance, supply duct resistance, damper resistance, and the weight of the duct static pressure in fan operation. For a much more accurate and detailed explanation, see the Engineering Reference.
If you implement the two curves correctly, you will see a change in damper position, flow, pressure across the fan, and fan energy use in the simulation.
| | 2 | No.2 Revision |
The "Fan Pressure Rise Curve" must be modified in tandem with the "Duct Static Pressure Reset Curve" in the Fan:ComponentModel object in order to open the VAV dampers more and run the fan at a lower pressure, thereby consuming less energy.
The "Duct Static Pressure Reset Curve" takes as input flow the m3/s flowing through the ducts and outputs the desired duct pressure at that flow.
The "Fan Pressure Rise Curve" takes as input the flow and "Duct Static Pressure Reset Curve" output. The four terms in the "Fan Pressure Rise Curve" represent different sources of resistance in a duct system model including, but not limited to, the return duct resistance, supply duct resistance, damper resistance, and the weight of the duct static pressure in fan operation. For a much more accurate and detailed explanation, see the Engineering Reference.
If you implement the two curves correctly, you will see a change in damper position, flow, pressure across the fan, and fan energy use in the simulation.
