HAC_EEI1: HVAC energy-efficiency indicator 1, rule 1
Block HAC_EEI1 (FB841) calculates whether a manual setpoint shift meets the given conditions for energy efficiency and supplies the result to the output.
(Rule1: Monitor manual setpoint shift). HAC_EEI1_SiUn (FB841), HAC_EEI1_UsUn (FB798)
Principle of operation
The calculates whether the manual setpoint shift [SpSh] results in higher energy consumption for heating ([HCSta] = 2) or cooling ([HCSta] = 3) and whether the setpoint shift exceeds the set tolerance thresholds [TolMaxEei1].
| IF | THEN |
Heating [HCSta] = 2 | [SpSh] > [TolMaxEei1] | [Out] = 1 |
Cooling [HCSta] = 3 | [SpSh] < [TolMaxEei1] | [Out] = 1 |
Prerequisite: Calculation only takes place if the priority for the manual intervention [SpShPrPrio] =13. | ||
Note: The block evaluates the last setpoint shirt based on the existing room condition. It is possible that the last setpoint shift may no longer be evaluated as energy efficient if the framework condition changes.
Example: The setpoint is reduced during boost heating in the room. The setpoint shift was evaluated as energy efficient.
But then demand for cooling occurred later, as the room was occupied. In this relationship, the last setpoint shift is evaluated as not energy efficient since the setpoint is now specified that is lower than necessary.
Inputs
PIN | E | Description | |
TolMaxEei1 | pax | Max. tolerance for energy efficiency indicator 1 | |
HCSta |
| Heating/cooling state | |
1 (none) |
| ||
2 (heating) | Heating state. | ||
3 (cooling) | Cooling state. | ||
SpSh |
| Setpoint shift | |
SpShPrPrio |
| Setpoint shift present priority. | |
Outputs
PIN | E | Description | |
Out |
| Output | |
0 (No) | Energy efficiency met. | ||
1 (Yes). | Energy efficiency not met. | ||
Input values
PIN | Description | Data type | Default value | Engineering unit or text group | Min. | Max. |
TolMaxEei1 | Max. tolerance for energy efficiency indicator 1 | REAL | 1.0 | K | -3.40E38 | 3.40E38 |
2.0 | °F | -3.40E38 | 3.40E38 | |||
HCSta | Heating/cooling state | INT | 1 | Neither heating/cooling. | 1 | 3 |
SpSh | Setpoint shift | REAL | 0.0 | K | -20.0 | 20.0 |
0.0 | °F | -36.0 | 36.0 | |||
SpShPrPrio | Setpoint shift present priority. | INT | 15 | BA present priority for SystemOne | 0 | 17 |
Output values
PIN | Description | Data type | Default value | Engineering unit or text group | Min. | Max. |
Out | Output | BOOL | 0 | No, Yes |
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Process response
Standard (see General rules and information).
Troubleshooting
Standard (see General rules and information).