Energy insight function for fan energy usage logging and monitoring of SFP.


Specific Fan Power (SFP) is a parameter that quantifies the electric power that is needed to drive a fan, relative to the airflow it creates.

The Access support calculation of the SFP for modbus controlled fans and variable frequency drives (VFDs). The data of power consumption is read directly from the fan or VFD.

It is possible to set power factor for each fan to compensate power losses in the VFD. If, for instance, power loss is 5 %, the power factor should be set to 1.05.



Total fan power is a sum of actual fan powers of all fans.



The calculation of SFP uses value of either supply or extract air flow depending on which one is greater.



The Access display actual SFP value as well as daily and monthly average. SFP for the average values is calculated only when the unit is running.


Configuration of Energy insight function for fan energy usage logging and monitoring of SFP


Variable

Available options & Selection

Note


Activate Energy insight function

Configuration > Functions > Function activation

Energy insight

| Yes | No |



Configuration of the Energy insight function

Configuration > Functions > Energy insight

Energy usage presentation: Fans

| Yes | No |


Power factor supply air fan

[1.00]

Power factor to compensate power losses in the VFD

Power factor extract air fan

[1.00]


Operational settings

Data & Settings > Energy insight

SFP

___ kW/m³/s

Current SFP

Power usage fans

___ kW

Indication of current fan power usage

Data & Settings > Energy insight > SFP >


SFP

___ kW/m³/s

Current SFP

SFP day average

___ kW/m³/s

Average SFP today

SFP month average

___ kW/m³/s

Average SFP this month

Frequency converter loss

0%


Data & Settings > Energy insight > Today and last 7 days: Fans

Used energy: Fans

Value

Headline

Today

___ kWh

Accumulated daily fan energy use for the last 7 days

Today -7 days

___ kWh

Data & Settings > Energy insight > Monthly up to 3 years back: Fans

Used energy: Fans

Year | Year -1  | Year -2 | Unit

Headline

January

___   |    ___    |    ___    | kWh

Usage of power per month / year

December

___   |    ___    |    ___    | kWh

Sum

___   |    ___    |    ___    | MWh

Yearly energy usage

Data & Settings > Energy insight > Energy meter

Used energy: Fans

___ kWh

Energy used by the fans since the last reset of the meter

Meter started

date & time

Date and time the power meter was last reset

Meter reset

| Yes | No |

Reset power meter by choosing | Yes |