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What tool do you use to draw schematic of air loops and plant loops?

Whether you want to communicate with someone, plan your approach for modeling or label your nodes for an EnergyPlus simulation, it's often useful to draw out a schematic of an air loop or a plant loop, so you can see all the equipment and connections you need.

I usually do that by hand, but it's not easy to share it or to modify it. Using AutoCad for that is overkill.

I was wondering if people have found an easy to use and quick sketching tool, preferably free (and open source even better).

Ideally I'd like something with a library of common things where you can drag and drop your objects, and snap some connecting lines forced at a 90° angle. If you move an equipment, all connections would still be snapped to it. It would ideally also handle nicely lines crossing each other (creating bridges)

What tool do you use to draw schematic of air loops and plant loops?

Whether you want to communicate with someone, plan your approach for modeling or label your nodes for an EnergyPlus simulation, it's often useful to draw out a schematic of an air loop or a plant loop, so you can see all the equipment and connections you need.

I usually do that by hand, but it's not easy to share it or to modify it. Using AutoCad for that is overkill.

I was wondering if people have found an easy to use and quick sketching tool, preferably free (and open source even better).

Ideally I'd like something with a library of common things where you can drag and drop your objects, and snap some connecting lines forced at a 90° angle. If you move an equipment, all connections would still be snapped to it. It would ideally also handle nicely lines crossing each other (creating bridges)

Update

Here is an example of what I may want to draw:

Example of a plant loop