De Anza ES 69 Intro to Energy Management Technology Energy Economics Scott Gould Energy Engineer Stanford University.

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Presentation transcript:

De Anza ES 69 Intro to Energy Management Technology Energy Economics Scott Gould Energy Engineer Stanford University

What are Economic Analyses? Decision Making Tools for Energy Projects Does not include non-economic benefits Environment Society “Good Neighbor”

Objectives Understand that Economic Analyses can range from simple to complex Be able to Review and Understand Assumptions Become Familiar with the Limits of Economic Analysis Become Familiar with Example Calculations

Types of Economic Analyses Rough order of Magnitude Estimates Simple Payback Internal Rate of Return Used on Both New Building Projects and Retrofits Glazing, HVAC, Chiller & Boiler Selection

Assumptions are Key! First Cost Cost of Energy (Tariff rate) Cost of Labor Cost of Materials Cost of Maintenance Cost of Money, tax credits Inflation

Simple Payback Simple payback = Cost/Savings Measures how long it will take to recover a cost-saving investment Does not account for cost of money or length of project

Refrigerator Example Assumptions: Extra first cost  Energy Star = $890  Brand “X” non energy star = $860 Energy = $/kWh E-1 PG&E Rate  Energy Star = 556 kWh/yr or $64.01/yr  Brand “X” = 695 kWh/yr or $80.01/yr  see “Savings Calculator”

Refrigerator Example cont. Simple Payback = Cost/savings Cost = $890-$860 = $30 Savings = $80.01 – $64.01 = $16.00 Simple Payback = $30/$16 = 1.9 years

Water Heater Example Natural Gas v Electric Energy Costs ( $0.52 therm = $167 year $0.115 kWh = $645 year First Cost ( Gas = $405 Electric =$168

Water Heater cont. Simple Payback = Cost/Savings Cost = $405-$168 = $237 Savings = $645/yr - $167/yr = $478/yr Simple Payback = $237/$478 =.49 years! (6 mos) But Wait! Installation cost Permits

Compact Fluorescent Example Compare Incandescent to Compact Fluorescent Lighting First Cost ( Incandescent $ w 1150 lumens Compact Fl. $ w 1200 lumens Energy cost A1 Rate( $0.125 /kWh

Compact Fluorescent cont. Assume 100 lamps Annual hours of operation Case 1. Assume 9 hrs per day, 5 days per week or 2340 hours per year Case 2. Assume 12 hrs per day, 6 days per week or 3744 hours per year Simple Payback = Cost/Savings Case 1. =.97 years or ~ 1 year Case 2. =.58 years or ~ 7 months

Life Cycle Cost Total cost of owning, operating, and maintaining a system over its useful life. Costs are adjusted for time value of money. Alternative with the lowest life cycle cost is the best.