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The problem appears to be that the path name is too long (truncating EnergyPlus to EnergyP)

Incorrect assumption -- EnergyPlus is "just an engine" so that others can provide the interfaces their domains need. So that US Government funds are focused on the features of the Building Energy (pl ...

If you can accurately model the thermal properties from the physical properties, it should be a good solution. You'll have to decide which of the heat balance algorithms will give you the best bang f ...

"I guess I will just have to wait for the EnergyPlus user interface to grow up."

EnergyPlus is intentionally just an "engine" with the flexibility and features for simulation. We want to rely on t ...

And to clarify, so you don't think I am totally off base.

I was talking about the VENTILATION object in EnergyPlus whereas DB/Natural Ventilation triggers AirFlow Network simulations.

See if you can set the lower temp limit to -100C (that's the minimum for EnergyPlus).

If you need to run EnergyPlus directly, you will need to export your file and run from there.

I don't know if you can control what you want within DB but EnergyPlus allows a lot of flexibility in bringing in natural ventilation.

Basically, when you get a Fatal Error and then node connection errors, you should ignore those node connection errors until you fix the thing that caused the Fatal Error.

EnergyPlus receives the Fa ...

EnergyPlus has the refrigerated case -- if that's what you're doing. Otherwise, it should be capable of those numbers -- if you can model your refrigeration system to that low a degree.

One of the things we've found to make EnergyPlus most time consuming is the number of surfaces and even more, the number of shading surfaces total in the facility.

It is true, many shading devices (as will many building surfaces) will cause the simulation to be slower. Simplifying the model can help.

If DesignBuilder does not yet support PV, you always have the option of exporting your IDF file and adding to it from the EnergyPlus tools.

You may want to look at the EnergyPlus documentation on "refrigerated cases". If you decide to use those, you will most likely have to export your DB file into IDF and work singly with them. (I don' ...

It depends. In some of the US Southwestern states, a heavy (i.e. concrete) uninsulated wall is very effective in being able to extend the cooler night time temperatures and, in those cases, a more he ...

I would think you would need to specify it like other WindowGlass materials.

In EnergyPlus terms:
! The values after the name are:
! Th: Thickness (m)
! Ts: Solar transmittance at normal i ...

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