Dear Mr / Ms Herrmann,
Fans can have separately assigned efficiencies for the fan and motor, as shown in the sample object below.
| FAN:SIMPLE:VARIABLEVOLUME, | |
| Fan Name | RFan_AH1, |
| Available Schedule | SchCpct_FanOpern, |
| Fan Total Efficiency | 0.6, |
| Delta Pressure | 1, |
| Max Flow Rate | Autosize, |
| Min Flow Rate | 0, |
| Motor Efficiency | .91, |
| Motor In Airstream Fraction | 1, |
| FanCoefficient 1 | .0013, |
| FanCoefficient 2 | .147, |
| FanCoefficient 3 | .9506, |
| FanCoefficient 4 | -.0998, |
| FanCoefficient 5 | 0, |
| Fan_Inlet_Node | NodeOut_EA_AH1, |
| Fan_Outlet_Node | NodeIn_OA_AH1; |
| End-Use Subcategory |
Pumps, however, combine the efficiencies of motor and pump into a single value which is somewhat poorly identified as "Motor Efficiency". Since the combined value is static, this is not a big concern. It does, however, force a separate calculation to combine the motor and pump efficincies into a single value for pumps.
| PUMP:VARIABLE SPEED, | |
| Pump Name | HtgWtr Pump_1, |
| Inlet_Node | Node_HtgWtr SupplyInlet_In, |
| Outlet_Node | Node_HtgWtr Pump1_Out, |
| Rated Volumetric Flow Rate | 0.0076, |
| Rated Pump Head | 179165, |
| Rated Power Consumption | 2350, |
| Motor Efficiency | 0.895, |
| Fraction of Motor Inefficiencies to Fluid Stream | 0, |
| Coefficient1 of the Part Load Performance Curve | 0.203671, |
| Coefficient2 of the Part Load Performance Curve | -0.827077, |
| Coefficient3 of the Part Load Performance Curve | 1.181191, |
| Coefficient4 of the Part Load Performance Curve | 0.442055, |
| Min Flow Rate while operating in variable flow capacity | 0.0023, |
| Pump Control Type | CONTINUOUS, |
| Pump Flow Rate Schedule Name | SchCpct_AlwaysOn; |