Energy Dashboard

• Get building managers to monitor consumption and load
• Save on electricity costs
• Cut down on carbon emissions
  • Be good with money, be great to the environment!

• Consists of real, reactive, and apparent power:
  • P: Real power
    • \(P = I^2 \times R\); \(P = V^2/R\)
    • Measured in Watts, W
  • Q: Reactive power
    • \(Q = I^2 \times X\); \(Q = V^2/X\)
    • Measured in Volt-Amp-Reactive, VAR
  • S: Apparent power
    • \(S = I^2 \times Z\); \(S = V^2/Z\)
    • Measured in Volt-Amps, VA
• The three are related through the phase angle (\(\theta\)) in a Pythagorean sense: (apparent power)\(^2\) = (real power)\(^2\) + (reactive power)\(^2\)
• And the Power Factor = Real / Apparent

• Tells us what proportion of delivered load is actually being used
• The electricity provider will charge in proprtion to delivered load
  • And a needlessly large load will incur a higher rate per kWh
• The building manager needs to keep the power factor as close to unity at all times!
• So, if a meter returns a pair of real and reactive power readings we can obtain the apparent power as follows:

readings <- c(80, 60) # kWh, VAR
apparent <- sqrt(sum(readings**2))
apparent

## [1] 100

• Indicating that we are using 80% of the energy being delivered

• The demo mimics a site with four sub-meters
  • Each can be selected through a drop-down list
  • The date can be selected through the calendar app
• The building manager can monitor efficiency across the building
• We save money and use less carbon
  • Everybody wins!