classConventions
Conventions
Extends from Modelica.Icons.Information (Icon for general information packages).
Information
Control point connections
Inside a template class, the connect clauses involving control points
typically do not have
any graphical annotation and are therefore not rendered as
connection lines in the diagram view.
Those connect clauses are grouped together in a dedicated section of
the equation section of each class, namely
/* Control point connection - (start | stop) */.
Definitions
System
We adopt the definition hereafter from ASHRAE (2021).
A set of components is a system if they share a load in common (i.e., collectively act as a source to downstream equipment, such as a set of chillers in a lead/lag relation- ship serving air handlers).
- Each air handler constitutes its own separate system because it does not share a load (terminal unit) in common with the other air handlers.
- Each VAV box constitutes its own system because it does not share a load (conditioned space) in common with the other VAV boxes.
Abbreviations
The following abbreviations are used in that package.
| Abbreviation | Description |
|---|---|
| AI | Analog input (integer or real) |
| AFMS | Airflow measuring station |
| AHU | Air handling unit |
| AO | Analog output (integer or real) |
| CHW | Chilled water |
| CW | Condenser water |
| DHW | Domestic hot water |
| DI | Digital input (Boolean) |
| DO | Digital output (Boolean) |
| DOAS | Dedicated outdoor air system |
| DP | Differential pressure |
| HHW | Heating hot water |
| OA | Outdoor air |
| VAV | Variable air volume |
| VFD | Variable frequency drive |
References
- ASHRAE, 2021. Guideline 36-2021, High-Performance Sequences of Operation for HVAC Systems. Atlanta, GA.