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Appendix B: Descriptions of Commercial Sector Energy Efficiency Measures for
North Carolina
107
whenever there is sufficient solar energy. Solar pool heating is the most
economical way to heat your pool. There are zero operating costs and virtually
no maintenance.
1.3 Envelope
High efficiency windows are covered in this section. Listed below are the basic
assumptions used in this study for this measure. These assumptions include
annual kWh savings, demand savings, useful life, and incremental cost. Sources
for this data can be found in Appendix B1: Commercial Measure Assumptions.
Measure Name
Annual
kWh
Savings
KW
Demand
Savings
Measure
Useful
Life
Incremental
Cost
Double Pane Low Emissivity Windows 7 0.0 30 $0.51
1.3.1 Double Pane Low Emissivity Windows194
Double- or triple-pane windows have insulating air- or gas-filled spaces between
each pane. Each layer of glass and the air spaces resist heat flow. The width of
the air spaces between the panes is important, because air spaces that are too
wide (more than 5/8 inch or 1.6 centimeters) or too narrow (less than 1/2 inch or
1.3 centimeters) have lower R-values (i.e., they allow too much heat transfer).
Advanced, multi-pane windows are now manufactured with inert gases (argon or
krypton) in the spaces between the panes because these gases transfer less
heat than does air. Low-emissivity (low-e) glass has a special surface coating to
reduce heat transfer back through the window. These coatings reflect from 40%
to 70% of the heat that is normally transmitted through clear glass, while allowing
the full amount of light to pass through.
1.4 Space Cooling
Space cooling energy efficiency measures are covered in this section. Listed
below are the basic assumptions used in this study for measure annual kWh
savings, demand savings, useful life, and incremental cost. Sources for this data
can be found in Appendix B1: Commercial Measure Assumptions.
Measure Name
Annual
kWh
Savings
KW
Demand
Savings
Measure
Useful
Life
Incremental
Cost
Centrifugal Chiller, 0.51 kW/ton, 300
tons 34,803 23.5 25 $16,200
Centrifugal Chiller, 0.51 kW/ton, 500
tons 58,005 39.1 25 $27,000
Centrifugal Chiller, Optimal Design,
0.4 kW/ton, 500 tons (may be new
construction only) 128,900 86.9 25 $60,000
194 Energy Guide Website. www.energyguide.com
Object Description
Description
| Title | A study of the feasibility of energy efficiency as an eligible resource as part of a renewable portfolio standard for the state of North Carolina : report for the North Carolina Utilities Commission - Page 110 |
| Full Text | Appendix B: Descriptions of Commercial Sector Energy Efficiency Measures for North Carolina 107 whenever there is sufficient solar energy. Solar pool heating is the most economical way to heat your pool. There are zero operating costs and virtually no maintenance. 1.3 Envelope High efficiency windows are covered in this section. Listed below are the basic assumptions used in this study for this measure. These assumptions include annual kWh savings, demand savings, useful life, and incremental cost. Sources for this data can be found in Appendix B1: Commercial Measure Assumptions. Measure Name Annual kWh Savings KW Demand Savings Measure Useful Life Incremental Cost Double Pane Low Emissivity Windows 7 0.0 30 $0.51 1.3.1 Double Pane Low Emissivity Windows194 Double- or triple-pane windows have insulating air- or gas-filled spaces between each pane. Each layer of glass and the air spaces resist heat flow. The width of the air spaces between the panes is important, because air spaces that are too wide (more than 5/8 inch or 1.6 centimeters) or too narrow (less than 1/2 inch or 1.3 centimeters) have lower R-values (i.e., they allow too much heat transfer). Advanced, multi-pane windows are now manufactured with inert gases (argon or krypton) in the spaces between the panes because these gases transfer less heat than does air. Low-emissivity (low-e) glass has a special surface coating to reduce heat transfer back through the window. These coatings reflect from 40% to 70% of the heat that is normally transmitted through clear glass, while allowing the full amount of light to pass through. 1.4 Space Cooling Space cooling energy efficiency measures are covered in this section. Listed below are the basic assumptions used in this study for measure annual kWh savings, demand savings, useful life, and incremental cost. Sources for this data can be found in Appendix B1: Commercial Measure Assumptions. Measure Name Annual kWh Savings KW Demand Savings Measure Useful Life Incremental Cost Centrifugal Chiller, 0.51 kW/ton, 300 tons 34,803 23.5 25 $16,200 Centrifugal Chiller, 0.51 kW/ton, 500 tons 58,005 39.1 25 $27,000 Centrifugal Chiller, Optimal Design, 0.4 kW/ton, 500 tons (may be new construction only) 128,900 86.9 25 $60,000 194 Energy Guide Website. www.energyguide.com |
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