1 Revised Solar Water Heating Deemed Savings Estimates April 1, 2003.

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Presentation transcript:

1 Revised Solar Water Heating Deemed Savings Estimates April 1, 2003

2 Reason for Revisions Current “Deemed” Values based on system with 40 sq.ft. collector area Oregon Tax Credits and “Brightway” specifications cover three “generic” sizes –37.3 sq.ft. –60.0 sq.ft. –74.6 sq.ft.

3 Analytical Approach Use Oregon Office of Energy “Savings” Estimates for Systems Approved for Tax Credit Estimate “Average” savings/sq.ft. collector area across all listed systems Use “curve fit” to establish savings for three system sizes

4 Regression Fit for Solar DHW Systems with Tanks

5 Regression Fit for Solar DHW Systems without Tanks

6 Comparison of Regression Fit Results for 40 sq.ft. System Solar ZoneSavings for Systems w/Tank (kWh/yr) Savings for Systems w/o Tank (kWh/yr) Zone 1 1,818 1,930 Zone 2 2,161 2,324 Zone 3 2,272 2,391

7 Comparison of Regression Fit Results for 80 sq.ft. System Solar ZoneSavings for Systems w/Tank (kWh/yr) Savings for Systems w/o Tank (kWh/yr) Zone 1 2,441 2,561 Zone 2 2,752 2,917 Zone 3 2,964 3,139

8 Regression Fit Results for Deemed Solar DHW Systems Solar ZoneCollector Area = 37.3 sq. ft. (kWh/yr) Collector Area = 60.0 sq. ft. (kWh/yr) Collector Area = 74.6 sq. ft. (kWh/yr) Zone 1 1,800 2,200 2,400 Zone 2 1,900 2,300 2,500 Zone 3 2,100 2,600 2,700 Zone 4 2,400 3,000 3,200 Zone 5 2,500 3,200 3,400