Plant Energy Balance

1. Plant Energy Balance

2. Effective Energy Management • Develop baseline • Utility analysis • Plant energy balance • Lean energy analysis (LEA) • Take action • Identify and quantify energy saving opportunities • Prioritize energy saving opportunities • Implement energy saving opportunities • Measure and benchmark to sustain efforts • Develop metrics for system energy efficiency • Measure energy efficiency improvement with sliding NAC • Compare energy efficiency between facilities with NAC

3. Plant Energy Balance • Energy Balance: Ein – Eout = DEstored • Plant Energy Balance: Where does Ein go? • In some cases, detailed sub-metered data may be available. • However, a useful approximation can be derived from the method that follows. • This chapter shows how to calibrate approximate the energy use by equipment against total energy input using the energy balance concept. • This information is helpful in • focusing efforts on large energy users • calibrating engineering models of equipment Ein E,out

4. Efficiency • Pinput – Plost – Puseful,output = 0 • Energy efficiency is defined as the ratio of useful power output to total power input. • Efficiency = Puseful,output / Pinput Plost Pin Puseful,out • Many pieces of energy using equipment are rated by energy or power output. Thus, energy input is: • Einput = Euseful,output / Efficiency

5. Electricity Energy Balance:Data Supplied By Facility

6. Electricity Energy Balance Example: E = 10 motors x 40 hp/motor x 50% / 90% x 4,000 hr/yr x 0.746 kW/hp E = 663,111 kWh/yr

7. Electricity Energy Balance:Sorted from Highest to Lowest

8. Fuel Energy Balance:Data Supplied By Facility

9. Fuel Energy Balance Example: E = 2 boilers x 3 mmBtu/hr-boiler x 80% x 6,000 hr/yr / 80% E = 36,000 mmBtu/yr

10. Fuel Energy Balance:Sorted from Highest to Lowest