Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The answer is you can't specify where the water main connects in a plantloop. The water main is connected to the outlet node of WaterUse:Connections objects. It's more like the WaterUse:Connections objects change the water temperature of used water to the temperature of the water main. This goes with the general conservation of everything model in energyplus, which is water volume in this case.
As for making sure the water heaters used water from the PVT heat storage water tank instead of water from the main, I found a reasonable way to do it.
I added a second plant loop to the PVT heat storage water tank with a bunch of WaterHeater:Mixed objects that never heat their water. These heat transfer tanks are inserted before the outlet node of the demand side of each plantloop that has WaterUse objects in it. By doing connecting like this, the cold water from the main is run through a heat transfer tank before going to the supply WaterHeater:Mixed supply for that loop. Not the cleanest solution, but it works.
| | 2 | No.2 Revision |
The answer is you can't specify where the water main connects in a plantloop. The water main is connected to the outlet node of WaterUse:Connections objects. It's more like the WaterUse:Connections objects change the water temperature of used water to the temperature of the water main. This goes with the general conservation of everything model in energyplus, which is water volume in this case.
As for making sure the water heaters used water from the PVT heat storage water tank instead of water from the main, I found a reasonable way to do it.
I added a second plant loop to the PVT heat storage water tank with a bunch of WaterHeater:Mixed objects that never heat their water. These heat transfer tanks are inserted before the outlet node of the demand side of each plantloop that has WaterUse objects in it. By doing connecting like this, the cold water from the main is run through a heat transfer tank before going to the supply WaterHeater:Mixed supply for that loop. Not the cleanest solution, but it works.
