Energy Audit Math: End Uses, Lighting, Motors, Compressed Air, Heat Pumps & Verified Savings

What you'll build

What you will be able to do

Each lab ends with a concrete result that you build yourself and the checker confirms, cell by cell.

• Estimate the yearly kWh of eight end uses from rated power, load factor and hours, turn them into shares and costs, and find the significant energy uses an audit should focus on.
• Calculate the monthly kWh per unit produced, the pooled intensity for two years, its change and the kWh saved compared with the base-year intensity, and you learn why this simple indicator can flatter a busy year.
• Turn a lighting inventory into old and new kWh, apply occupancy sensors where they help, value the yearly savings and work out the simple payback of the LED retrofit.
• Calculate the yearly kWh of an extract fan over its duty profile with damper control and with a variable speed drive, using the cube law, and work out the savings and the payback of the drive.
• Size every tagged leak with a lookup, turn the leak flow into kW and a yearly cost, and cross-check the survey with a leak-down test of the compressor.
• Turn the hall's heat demand into energy bought for an old boiler, a condensing boiler and a heat pump, compare running costs and the cost over 15 years, and calculate the CO2e the heat pump would cut.
• Screen six audit measures by simple payback, net savings over their life and cost per kWh saved, rank them and spot which measure a payback rule alone would wrongly bury.
• Build a baseline model of electricity against production from 2025, calculate the energy avoided each month of 2026, add it up as a CUSUM and chart it to see when the measures started to work.