Calculate Energy Savings Methodology 3: Evaluation of Distribution Efficiency Determine Distribution Efficiency by evaluating duct system before and after duct sealing using Building Performance Institute Efficiency Look-Up “Distribution Table” Summer Coincident Peak Demand Savings Table 229: Duct Sealing – Values and References Term Unit Value Source CF , Demand Coincidence Factor (See Decimal Default = 0.647 11 Section 1.5) for central AC systems CFM50whole house , Duct leakage at 50 EDC Data EDC Data Gathering Pascal pressure differential Gathering CFM25DB , Cubic feet per minute of air EDC Data Gathering 12 leaving the duct system at 25 Pascals CFM25BASE , Standard Duct Leakage test result at 25 Pascal pressure differential of EDC Data Gathering 12 the duct system prior to sealing, calculated from the duct blaster fan flow chart CFM25EE , Standard Duct Leakage test result at 25 Pascal pressure differential of EDC Data Gathering 12 the duct system after sealing, calculated from the duct blaster fan flow chart CFM50envelope only , Standard Blower EDC Data Door test result finding Cubic Feet per EDC Data Gathering Gathering Minute at 50 Pascal pressure differential , Subtraction Correction Factor to SCF None account for underestimation of duct Table 4, on pg 45 of leakage due to connections between the Minneapolis Blower duct system and the home. Determined by Manual 7, 10 Door™ Operation measuring pressure in duct system with for Model 3 and Model 4 registers sealed, and using look up table Systems (Source 10) provided by Energy Conservatory Conv , Conversion factor from CFM50 to None 0.64 2 CFM25 SLF , Supply Loss Factor (% leaks sealed None 4, EDC Data EDC Data Gathering located in Supply ducts x 1) Gathering
Calculate Energy Savings Methodology 3: Evaluation of Distribution Efficiency Determine Distribution Efficiency by evaluating duct system before and after duct sealing using Building Performance Institute “Distribution Efficiency Look-Up Table” Summer Coincident Peak Demand Savings Table 229: Duct Sealing – Values and References Term Unit Value Source CF , Demand Coincidence Factor (See Section 1.5) for central AC systems Decimal Default = 0.647 11 CFM50whole house , Duct leakage at 50 Pascal pressure differential EDC Data Gathering EDC Data Gathering CFM25DB , Cubic feet per minute of air leaving the duct system at 25 Pascals EDC Data Gathering 12 CFM25BASE , Standard Duct Leakage test result at 25 Pascal pressure differential of the duct system prior to sealing, calculated from the duct blaster fan flow chart EDC Data Gathering 12 CFM25EE , Standard Duct Leakage test result at 25 Pascal pressure differential of the duct system after sealing, calculated from the duct blaster fan flow chart EDC Data Gathering 12 CFM50envelope only , Standard Blower Door test result finding Cubic Feet per Minute at 50 Pascal pressure differential EDC Data Gathering EDC Data Gathering SCF , Subtraction Correction Factor to account for underestimation of duct leakage due to connections between the duct system and the home. Determined by measuring pressure in duct system with registers sealed, and using look up table provided by Energy Conservatory None Table 4, on pg 45 of Minneapolis Blower Door™ Operation Manual for Model 3 and Model 4 Systems (Source 10) 7, 10 Conv , Conversion factor from CFM50 to CFM25 None 0.64 2 SLF , Supply Loss Factor (% leaks sealed located in Supply ducts x 1) None EDC Data Gathering 4, EDC Data Gathering
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