Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question
3

Is there any way to create a dual-branch air-handling unit by using EnergyPlus or OpenStudio?

asked 2018-11-06 22:53:06 -0600

I plan to create a Dual-branch air-handling unit (attached) for building energy model. As we know, there are some restricts of the node settings in the HVAC system by using EnergyPlus or OpenStudio. Whether there are some methods like using EMS to create the system? image description

edit retag flag offensive close merge delete

2 Answers

Sort by ยป oldest newest most voted
3

answered 2018-11-07 12:45:06 -0600

Are you trying to model a dual duct system (hot branch/cold branch)? That is an available system type in OpenStudio/EnergyPlus.

Otherwise you cannot define multiple zone terminal units serving the same zone from the same air loop.

edit flag offensive delete link more

Comments

In my case, some return air (RAB) will be used for reheating the cooled air from cooling coil directly. Is it possible to create two branches for return air? Thanks.

Yunyang Ye gravatar imageYunyang Ye ( 2018-11-07 13:58:30 -0600 )edit

nope, this is not possible in EnergyPlus.

mdahlhausen gravatar imagemdahlhausen ( 2018-11-07 17:28:43 -0600 )edit
1

answered 2018-11-08 06:21:42 -0600

I'm wondering if you could approximate this with a VAV AHU with series fan powered boxes. That also can have return air (in the case of SFP boxes it is local plenum air) used for reheating the cooled air from the cooling coil. You would just need to think through what you would need to hard code to make it work like you want.

For example, if your system is constant volume and only has two fans but more than two zones, you would need to set the main primary fan to have zero power and a minimum flow fraction of 1.0 and spread the SA1 fan power evenly between your interior zone SFP terminals and SA2 fan power evenly between your exterior zone SFP terminals.

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

 

Question Tools

2 followers

Stats

Asked: 2018-11-06 22:53:06 -0600

Seen: 154 times

Last updated: Nov 08