actual wattage of the supplanted lights than the usage of the efficient LED lights, customer interviews should be considered as an appropriate channel for verification. Water Heater Tank Wrap Measure Name Water Heater Tank Wrap Target Sector Residential Measure Unit Tank Unit Energy Savings Varies Unit Peak Demand Reduction Varies Measure Life 7 years This measure applies to the installation of an insulated tank wrap or to existing “blanket” residential electric hot water heaters. The base case for this measure is a standard residential, tank-style, electric water heater with no external insulation wrap. Algorithms The annual energy savings for this measure are assumed to be dependent upon decreases in the overall heat transfer coefficient that are achieved by increasing the total R-value of the tank insulation. ΔkWh ΔkWpeak Definition of Terms Ubase = Overall heat transfer coefficient of water heater prior to adding tank wrap (Btu/Hr-F-ft2). Uinsul = Overall heat transfer coefficient of water heater after addition of tank wrap (Btu/Hr-F-ft2). R = 1/U Abase = Surface area of storage tank prior to adding tank wrap (square feet) Ainsul = Surface area of storage tank after addition of tank wrap (square feet). = Thermal efficiency of electric heater element
actual wattage of the supplanted lights than the usage of the efficient LED lights, customer interviews should be considered as an appropriate channel for verification. Water Heater Tank Wrap Measure Name Water Heater Tank Wrap Target Sector Residential Measure Unit Tank Unit Energy Savings Varies Unit Peak Demand Reduction Varies Measure Life 7 years This measure applies to the installation of an insulated tank wrap or “blanket” to existing residential electric hot water heaters. The base case for this measure is a standard residential, tank-style, electric water heater with no external insulation wrap. Algorithms The annual energy savings for this measure are assumed to be dependent upon decreases in the overall heat transfer coefficient that are achieved by increasing the total R-value of the tank insulation. ΔkWh ΔkWpeak Definition of Terms Ubase = Overall heat transfer coefficient of water heater prior to adding tank wrap (Btu/Hr-F-ft2). Uinsul = Overall heat transfer coefficient of water heater after addition of tank wrap (Btu/Hr-F-ft2). R = 1/U Abase = Surface area of storage tank prior to adding tank wrap (square feet) Ainsul = Surface area of storage tank after addition of tank wrap (square feet). = Thermal efficiency of electric heater element
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