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Plant Energy Balance
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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
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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
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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
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Electricity Energy Balance: Data Supplied By Facility
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Electricity Energy Balance
Example: E = 10 motors x 40 hp/motor x 50% / 90% x 4,000 hr/yr x kW/hp E = 663,111 kWh/yr
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Electricity Energy Balance: Sorted from Highest to Lowest
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Fuel Energy Balance: Data Supplied By Facility
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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
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Fuel Energy Balance: Sorted from Highest to Lowest
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