`HvacPumpEnergyCalc` (FB)

FUNCTION_BLOCK HvacPumpEnergyCalc EXTENDS AbbLConC3

Only to be used when station has VFD based pumps. This function block calculates the energy consumed and saved. Based on that, the CO2 emission reductions and money saved is also computed. The Function block HvacPmpEnergyCalc calculates the energy consumption of the pumping station run by variable frequency drive and gives the information on cumulative flow in cubic meters. The Function Block includes following calculations:

Total energy consumed

Total energy saved

Total cost saved

Reduced CO2 emission

Note

For correct calculations this function block must be called in the task manager with 50 ms cyclic time.

InOut:

Scope	Name	Type	Initial	Comment
Input	`StartEnergyCalc`	`BOOL`	FALSE	2: To start the Energy calculation. When input is TRUE, the execution starts. When input is FALSE, the execution stops if running.
	`Tariff`	`REAL`	1.0	3: Per kWhr tariff rate in terms of currency, e.g. Dollar, Euro etc. Range-Value>0.0
	`CO2Conversion`	`REAL`	1.0	4: Factor which helps in converting the energy consumed in terms of CO2 emission tn/MWh. Range-Value>0.0
	`MonitorDuration`	`INT`	10	5: Time duration in minutes, to monitor the energy consumption. Range-Value>0
	`NumberOfPumps`	`INT`	8	6: Number of pumps in the pumping station Range- 1 to 8
	`PumpFlow`	ARRAY [1..8] OF REAL		7: Actual flow of each pump in m3/hr. Range-Value>0.0 ..Note:: The index 1 array is connected to the PumpID = 1. This pattern follows for all pump IDs.
	`PumpRatedPower`	ARRAY [1..8] OF REAL		8: Rated power in kW of each pump, if directly connected to the motor. Range-Value>0.0
	`PumpActPower`	ARRAY [1..8] OF REAL		9: Actual power of each pump in kW. Read from the VFD.Always PumpActPower < PumpDOLPower. Range-Value>0.0
	`ResetTotalVolume`	`BOOL`	FALSE	10: Reset Total volume. When input is TRUE, total volume is reset. When input is FALSE, pump continues with total volume.
	`ResetTotalEnergy`	`BOOL`	FALSE	11: Reset Total Energy. When input is TRUE, total energy value is reset. When input is FALSE, pump continues with total energy value.
Inout	`TotalVolume`	`LREAL`		12: Cumulative Flow Volume in Cubic meters. Total volume which is calculated using flow of all the pumps, in m3.
Inout	`TotalEnergy`	`LREAL`		13: The variable input/output TotalEnergy indicates the total actual energy in kWh. The total energy is calculated by combining the actual power of all pumps in kW in a hour.
Output	`ErrorID`	ERROR_ID		3: Error code in case of error in the function block execution.
	`EnergyConsumed`	`REAL`	0.0	4: Indicates energy consumed in the monitoring duration, in kWh. Value>=0.0
	`EnergySaved`	`REAL`	0.0	5: Indicates energy saved, in kW. Difference of energy consumed by pump with VFD and pump with DOL. Value>=0.0
	`MoneySaved`	`REAL`	0.0	6: Money saved, in tariff units. Value>=0.0
	`CO2Reduction`	`REAL`	0.0	7: Reduction of carbon dioxide emissions, in tn/MWh. Value>=0.0
	`EffInstant`	`REAL`	0	8: Instant flow vs actual power of the station
	`EffHour`	`REAL`	0	9: Hourly flow vs actual power of the station
	`EffDay`	`REAL`	0	10: Daily flow vs actual power of the station

Methods:

A_StartAction

B_CyclicAction

C_CleaningAction

D_AbortAction

E_ResetAction

Structure:

HvacPumpEnergyCalc (FB)

`HvacPumpEnergyCalc` (FB)