EnergyPlus

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  1. Airflow Network Duct Autosizing

    Autosize the ducts in AirflowNetwork based on Manual D. Automatically sizing ducts for desired flow rates will simplify specification of more complex models. NREL residential has a Manual J OpenStudio measure, so this could be done in OpenStudio, but the current feeling is that it’d be better in EnergyPlus

    2 votes
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    1 comment  ·  Air Flow  ·  Admin →
  2. Allow multiple air loops in the Airflow Network model

    The existing AirflowNetwork model only allows one air primary loop to calculate the energy losses for an air distribution system. This restriction makes the model only able to simulate energy performance with air distribution system losses in residential homes and small commercial buildings. Large commercial buildings are not covered by the model, because multiple air distribution systems, equivalent to multiple air primary loops in EnergyPlus, are expected. In order to make the AirflowNetwork model applicable to large building simulations, multiple air primary loops must be allowed.

    3 votes
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    0 comments  ·  Air Flow  ·  Admin →
  3. Improve fan support in Airflow Network

    Improve fan support in AirflowNetwork, including support for the new system fan model, support zone-induced air flow by a constant volume fan (described in Zone_2007_06.doc), and support for dedicated supply fans.

    2 votes
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    1 comment  ·  Air Flow  ·  Admin →
  4. Better window opening fraction controls

    In natural ventilation using the airflow network, the window opening position (fraction open) is based on the delta T between the outside air temperature and the indoor air temperature.

    This makes it very very easy for a model to operate with windows opening too much at the edges of the setpoint zone such that if heating + ventilation is applied, a lot of extra heating ends up being added to the building.

    Other bulk air flow modeling tools use a different window control which determines the window opening fraction based purely on the zone temperature.

    For example - Zone heating…

    1 vote
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    0 comments  ·  Air Flow  ·  Admin →
  5. Enhanced Cooltower (Passive Downdraft Evaporative Cooler, PDEC) Model

    Problem: The current cooltower (passive downdraft evaporative cooler) model in EnergyPlus is based on work by Givoni that applies mainly to cooltowers like the one at Zion National Park Visitor’s Center that has evaporative pads. While this could also be applied to systems which use water sprays, a more appropriate model that deals with the droplet size correctly would be better. The existing model is a good basic model that will allow users to model the impact of cooltowers in buildings using an established model. To model cooltowers with sprays more appropriately, a new model should be developed and added…

    5 votes
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    2 comments  ·  Air Flow  ·  Admin →
  6. Allow Simple Infiltration and AirflowNetwork in Same Model

    In large building models, I usually model infiltration using a ZoneInfiltration:DesignFlowRate object. However, there are times when I want to use airflow objects to model detailed infiltration in a limited number of zones. One example is modeling air infiltration due to doors opening in a supermarket vestibule.

    A second example would be a naturally ventilated warehouse that uses passive ventilation strategies for cooling. In both of these examples, there are additional zones that have some infiltration, but for which specifying AirflowNetwork objects to model simple ventilation or infiltration flows is tedious or inaccurate.

    It would be great to have the…

    2 votes
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    0 comments  ·  Air Flow  ·  Admin →
  7. Wind scoops as passive cooling

    Add support for modeling wind scoops as a type of passive cooling strategy.

    2 votes
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    0 comments  ·  Air Flow  ·  Admin →
  8. Enhanced Earth Tube Modeling

    Problem: While EnergyPlus does have an earth tube model, there are several improvements that could increase the accuracy of the predictions made by the model. The following are potential areas of improvement in the model:

    1. The existing earth tube model does not consider the time lag between the earth tube inlet and outlet air. The model assumes that the time when the outlet air comes out of the earth tube is the same as that when the inlet air enters the earth tube, despite the fact that there is a time lag in reality.

    2. The existing earth tube…

    2 votes
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    0 comments  ·  Air Flow  ·  Admin →
  9. Buoyancy driven air flow in atrium-like spaces

    Currently EnergyPlus Air Flow Network does not offer much in terms of stack driven air flow in a high space, such as an atrium.

    However, these type of spaces do exist in many buildings. Besides, architects, and arguably building energy analysts in general, are very much interested to test the potential of stack driven natural ventilation as a passive cooling strategy.

    14 votes
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    in discussion  ·  1 comment  ·  Air Flow  ·  Admin →
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