Question-and-Answer Resource for the Building Energy Modeling Community
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 | 1 | initial version |  |
Look in the mtd file and find the meters in question. That file will show you what is on each meter. The Heating:EnergyTransfer meter is, if I recall correctly, a sensible only meter. The HeatingCoils:EnergyTransfer is likely total energy transfer, including latent. This would explain why the heating coil energy transfer is larger than heating energy transfer. In fact I just went through this for AHSRAE Std 140 where the html District Heating energy was larger than the Heating:EnergyTransfer and I was confused, until I realized the difference between a meter including latent heat and one that does not.
| | 2 | No.2 Revision |
Look in the mtd file and find the meters in question. That file will show you what is on each meter. The Heating:EnergyTransfer meter is, if I recall correctly, a sensible only meter. The HeatingCoils:EnergyTransfer is likely total energy transfer, including latent. This would explain why the heating coil energy transfer is larger than heating energy transfer. In fact I just went through this for AHSRAE Std 140 where the html District Heating energy was larger than the Heating:EnergyTransfer and I was confused, until I realized the difference between a meter including latent heat and one that does not.
In the fan model the Electric Power Minimum Flow Rate Fraction = 0.2. At flow fractions below 0.2 the fan power will remain constant. At 0 flow the power will go to 0.
Fan:SystemModel,
PAU_Tower12_Office_1 Supply Fan, !- Name
LEED_V4_OFFICE_VENTILATION, !- Availability Schedule Name
PAU_Tower12_Office_1 Cooling Coil Outlet, !- Air Inlet Node Name
PAU_Tower12_Office_1 Supply Fan Outlet, !- Air Outlet Node Name
autosize, !- Design Maximum Air Flow Rate {m3/s}
Continuous, !- Speed Control Method
0.2, !- Electric Power Minimum Flow Rate Fraction
1200, !- Design Pressure Rise {Pa}
0.9, !- Motor Efficiency
1, !- Motor In Air Stream Fraction| | 3 | No.3 Revision |
Look in the mtd file and find the meters in question. That file will show you what is on each meter. The Heating:EnergyTransfer meter is, if I recall correctly, a sensible only meter. The HeatingCoils:EnergyTransfer is likely total energy transfer, including latent. This would explain why the heating coil energy transfer is larger than heating energy transfer. In fact I just went through this for AHSRAE Std 140 where the html District Heating energy was larger than the Heating:EnergyTransfer and I was confused, until I realized the difference between a meter including latent heat and one that does not.
In the fan model the Electric Power Minimum Flow Rate Fraction = 0.2. At flow fractions below 0.2 the fan power will remain constant. At 0 flow the power will go to 0.
Fan:SystemModel,
PAU_Tower12_Office_1 Supply Fan, !- Name
LEED_V4_OFFICE_VENTILATION, !- Availability Schedule Name
PAU_Tower12_Office_1 Cooling Coil Outlet, !- Air Inlet Node Name
PAU_Tower12_Office_1 Supply Fan Outlet, !- Air Outlet Node Name
autosize, !- Design Maximum Air Flow Rate {m3/s}
Continuous, !- Speed Control Method
0.2, !- Electric Power Minimum Flow Rate Fraction
1200, !- Design Pressure Rise {Pa}
0.9, !- Motor Efficiency
1, !- Motor In Air Stream Fraction
| | 4 | No.4 Revision |
Look in the mtd file and find the meters in question. That file will show you what is on each meter. The Heating:EnergyTransfer meter is, if I recall correctly, a sensible only meter. The HeatingCoils:EnergyTransfer is likely total energy transfer, including latent. This would explain why the heating coil energy transfer is larger than heating energy transfer. In fact I just went through this for AHSRAE Std 140 where the html District Heating energy was larger than the Heating:EnergyTransfer and I was confused, until I realized the difference between a meter including latent heat and one that does not.
In the fan model the Electric Power Minimum Flow Rate Fraction = 0.2. At flow fractions below 0.2 the fan power will remain constant. At 0 flow the power will go to 0.
Fan:SystemModel,
PAU_Tower12_Office_1 Supply Fan, !- Name
LEED_V4_OFFICE_VENTILATION, !- Availability Schedule Name
PAU_Tower12_Office_1 Cooling Coil Outlet, !- Air Inlet Node Name
PAU_Tower12_Office_1 Supply Fan Outlet, !- Air Outlet Node Name
autosize, !- Design Maximum Air Flow Rate {m3/s}
Continuous, !- Speed Control Method
0.2, !- Electric Power Minimum Flow Rate Fraction
1200, !- Design Pressure Rise {Pa}
0.9, !- Motor Efficiency
1, !- Motor In Air Stream Fraction
