Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
For the Baseline case (System 8—VAV with PFP Boxes), I could not add EvaporativeCooler:Direct:ResearchSpecial after AirTerminal:SingleDuct:ParallelPIU:Reheat due to Node connection constraint. It seems that AirTerminal object must be directly connected to Zone Air Inlet Node. I got a severe error, and the simulation terminated.
The only other option I can think of is adding EvaporativeCooler:Direct:ResearchSpecial before OutdoorAir:Mixer, but in this option, I also need to add a reheat coil to ensure sufficient humidification. I'm not sure if this option is allowed in terms of ASHRAE90.1 compliance.
| | 2 | No.2 Revision |
For the Baseline case (System 8—VAV with PFP Boxes), I could not add EvaporativeCooler:Direct:ResearchSpecial after AirTerminal:SingleDuct:ParallelPIU:Reheat due to Node connection constraint. It seems that AirTerminal object must be directly connected to Zone Air Inlet Node. I got a severe error, and the simulation terminated.
The only other option I can think of is adding EvaporativeCooler:Direct:ResearchSpecial before OutdoorAir:Mixer, but in this option, I also need to add a reheat coil to ensure sufficient humidification. I'm not sure if this option is allowed in terms of ASHRAE90.1 compliance.
For LEED certification which is based on ASHRAE90.1 Appendix G, I found a LEED Interpretation although it's very old. Acording to the Interpretation, Humidity control requirements in the baseline building should be the same as in the proposed building, even if that requires reheat to be modeled with that system type. So, using the same humidity control is a priority, and it seems that minor changes to the Baseline HVAC system are allowed for that.
| | 3 | No.3 Revision |
For the Baseline case (System 8—VAV with PFP Boxes), I could not add EvaporativeCooler:Direct:ResearchSpecial after AirTerminal:SingleDuct:ParallelPIU:Reheat due to Node connection constraint. It seems that AirTerminal object must be directly connected to Zone Air Inlet Node. I got a severe error, and the simulation terminated.
The only other option I can think of is adding EvaporativeCooler:Direct:ResearchSpecial before OutdoorAir:Mixer, but in this option, I also need to add a reheat coil to ensure sufficient humidification. I'm not sure if this option is allowed in terms of ASHRAE90.1 compliance.
For LEED certification which is based on ASHRAE90.1 Appendix G, I found a LEED Interpretation although it's very old. Acording to the Interpretation, Humidity control requirements in the baseline building should be the same as in the proposed building, even if that requires reheat to be modeled with that system type. So, using the same humidity control is a priority, and it seems that minor changes to the Baseline HVAC system are allowed for that.
P.S.
Revised psychrometic charts are as follows.
| | 4 | No.4 Revision |
For the Baseline case (System 8—VAV with PFP Boxes), I could not add EvaporativeCooler:Direct:ResearchSpecial after AirTerminal:SingleDuct:ParallelPIU:Reheat due to Node connection constraint. It seems that AirTerminal object must be directly connected to Zone Air Inlet Node. I got a severe error, and the simulation terminated.
The only other option I can think of is adding EvaporativeCooler:Direct:ResearchSpecial before OutdoorAir:Mixer, but in this option, I also need to add a reheat coil to ensure sufficient humidification. I'm not sure if this option is allowed in terms of ASHRAE90.1 compliance.
For LEED certification which is based on ASHRAE90.1 Appendix G, I found a LEED Interpretation although it's very old. Acording to the Interpretation, Humidity control requirements in the baseline building should be the same as in the proposed building, even if that requires reheat to be modeled with that system type. So, using the same humidity control is a priority, and it seems that minor changes to the Baseline HVAC system are allowed for that.
P.S.
Revised psychrometic charts are as follows.
