In order to accurately model the airflow characteristics of the HVR units for thermal simulation, modifications are made to the assigned MacroFlo opening type for the opening (and, in the case of doors, a custom Monodraught Quantum Damper construction is assigned). These modifications are performed on a copy of the MacroFlo opening type, as the original may be applied to other openings in the model that are not attached to HVR. However, if a suitable copy of the MacroFlo opening type already exists in the model, this one will be used instead to avoid bloating the opening type database.
The exact nature of the modifications to MacroFlo are dependent upon the type being set on the window/door. For HVR® Integrated Louvre, the following modifications are performed:
- The Opening Category is set to Louvre.
- The Openable Area % is set to 100.
- The Coeff. Discharge is set to 0.12.
- The Equivalent Orifice Area is recalculated.
- The Degree of Opening profile is set to HVR Exhaust and Intake Louvre - Yearly.
- The Description is set to HVR® Integrated Louvre (it may be optionally suffixed by a number, should multiple opening types exist with this name).
For HVR® Exhaust Louvre, the following modifications are performed:
- The Opening Category is set to Louvre.
- The Openable Area % is set to 100.
- The Coeff. Discharge is set to 0.15.
- The Equivalent Orifice Area is recalculated.
- The Degree of Opening profile is set to HVR Exhaust and Intake Louvre - Yearly.
- The Description is set to HVR® Exhaust Louvre (it may be optionally suffixed by a number, should multiple opening types exist with this name).
For HVR® Natural Vent. Louvre, the following modifications are performed:
- The Opening Category is set to Louvre.
- The Openable Area % is set to 100.
- The Coeff. Discharge is set to 0.15.
- The Equivalent Orifice Area is recalculated.
- The Degree of Opening profile is set to HVR Exhaust and Intake Louvre - Yearly.
- The Description is set to HVR® Natural Vent. Louvre (it may be optionally suffixed by a number, should multiple opening types exist with this name).
For HVR® Natural Vent. Window, the following modifications are performed:
- The Opening Category is set to Window – top hung.
- The Openable Area % is set to 95.
- The Max Angle Open ° is set to 20.
- The Equivalent Orifice Area is recalculated.
- The Degree of Opening profile is set to HVR Window - Yearly.
- The Description is set to HVR® Natural Vent. Window (it may be optionally suffixed by a number, should multiple opening types exist with this name).
All other settings in the created MacroFlo opening type should use the same values as their original source opening type.
When an opening is changed back to External Door or External Window (either manually using the options detailed in the previous section, or by assigning the room to the No HVR Assigned group), the assigned MacroFlo opening type will be reset to its original state (i.e. prior to setting the HVR type of the opening). If the original MacroFlo opening type is no longer available, the opening type specified by the room’s MacroFlo template will be used. In the case of external doors, the construction will also be set back to its original state – if the original construction is no longer available, the construction specified by the room’s Construction template will be used.
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Note: HVR MacroFlo opening types are automatically removed when they are no longer required – you are therefore prevented from manually assigning them onto openings. This limitation also applies to HVR Profiles, as they are automatically removed if all HVR unit groups (i.e. all HVR components in the component library) are removed from the model. Whilst it is possible to edit the values of the HVR MacroFlo openings and profiles, this is not recommended as it may result in inaccurate HVR simulation results that do not reflect real-world performance of the units.
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