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Severe Error: Temperature out of Bounds (Low)

asked 2015-08-21 14:20:33 -0500

mgleason05's avatar

updated 2023-01-31 12:19:58 -0500

I have a zone on the roof of a building that is well insulated, maintaining a temperature of 350 deg F. For some reason, I am getting the following error message:

* Severe * Temperature (low) out of bounds [-128.21] for zone="PC1_OVEN", for surface="PC1OVEN:PC1OVEN_WALL_3_0_0"

There are no cooling loads in this zone, and the natural weather is not anywhere near cold enough to cause anything to be -128.21 degrees. Any suggestions on where this error might come from?

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Hello @mgleason05. Welcome to UnmetHours. To help route the question to the right people, please tag with the software you are using.

__AmirRoth__'s avatar __AmirRoth__  ( 2015-08-21 17:05:31 -0500 )edit

My apologies! I am currently using EnergyPlus v8.3

mgleason05's avatar mgleason05  ( 2015-08-24 07:09:31 -0500 )edit

I had this problem, and I solved it by correcting the big amount of receptacle load assigned to the space containing the surface.

Angelibus's avatar Angelibus  ( 2016-11-29 09:19:19 -0500 )edit

Hi, there. I just have the same problem when I using the grasshopper_honeybee tool interface, the result of surfaces shows high out of bounds or low out of bounds .I can tell from your solve way , but seems that I couldn't find the counterpart setting in HB tool , Does anyone know how to figure it out? Thanks in advance!

borui's avatar borui  ( 2018-01-09 20:24:14 -0500 )edit

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answered 2015-08-24 10:35:16 -0500

Hi, when I get an error like this in EnergyPlus it usually has very little to do with that surface or that zone. Usually it is a problem elsewhere. I would check the errors you have above and correct as many of those as possible. Also make sure your air flow rates add up and are reasonable. Check your sizing objects, especially zone and system sizing. Finally check the sizes and efficiency you have put on your equipment that sometimes also causes this error.

The last time I got this error (last week) it was because I had incorrectly sizes my chilled ceilings water flow rate. The time before (the week before) my air flow rates where not adding up in my AHU objects. I have been modelling with EnergyPlus for ages too!

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answered 2023-01-30 19:44:10 -0500

Keigo's avatar

There are few clues about this severe error on UnmetHours. Although this is a very old question, I add another possible cause for those who have the same problem.

When we get this severe error, we may find the following message at the end of the err file.

       ************* ===== Final Error Summary =====
       ************* The following error categories occurred.  Consider correcting or noting.
       ************* Temperature (low) out of bounds
       ************* ..A temperature out of bounds problem can be caused by several things. The user should check:
       ************* ..1) the weather environment (including the horizontal IR from sky)
       ************* ..2) the level of interal gains with respect to the zone
       ************* ..3) the thermal properties of their materials.  And other things.
       ************* ..A common cause is a building with no or little thermal mass - all materials with Material:NoMass definitions.

In my case, this was exactly the cause. I used Material:NoMass for all walls/roofs/floors/ceilings, and the zones with the severe error had large windows.

EngineeringReference gives us a clue as to why this is the case. "There are potential issues with having a resistance-only layer at either the inner or outer most layers of a construction. A little or no mass layer there could receive intense thermal radiation from internal sources or the sun causing the temperature at the inner or outer surface to achieve very high levels."

However, sometimes we need to use Material:NoMass especially for ASHRAE90.1 Baseline case where the U-value is specified. There are two options to avoid the severe surface temperature error.

  1. Create the interior walls/ceilings/floors with multi-layer Material objects rather than Material:NoMass objects.
  2. Add InternalMas

For the option 2, there is no standard for how much InternalMass should be added. I often refer to DOE's Prototype Building Models. They have InternalMass objects to account for interior furnishings.

    Std Wood 6inch,          !- Name
    MediumSmooth,            !- Roughness
    0.15,                    !- Thickness {m}
    0.12,                    !- Conductivity {W/m-K}
    540.0000,                !- Density {kg/m3}
    1210,                    !- Specific Heat {J/kg-K}
    0.9000000,               !- Thermal Absorptance
    0.7000000,               !- Solar Absorptance
    0.7000000;               !- Visible Absorptance

    InteriorFurnishings,     !- Name
    Std Wood 6inch;          !- Outside Layer

    Perimeter_bot_ZN_3_InternalMass_1,  !- Name
    InteriorFurnishings,     !- Construction Name
    Perimeter_bot_ZN_3,      !- Zone or ZoneList Name
    ,                        !- Space or SpaceList Name
    626.8258;                !- Surface Area {m2}

In the Prototype Building Models, InternalMass objects are added to all conditioned zones, and the each Surface Area on InternalMass is set at twice the floor area of each zone regardless of the building type such as office, retail, residential, etc.

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Asked: 2015-08-21 14:20:33 -0500

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Last updated: Jan 30 '23