The 2030 Challenge & Current Energy Efficient Housing

The 2030 Challenge & Current Energy Efficient Housing James Petersen, P.E. Petersen Engineering 2007 Maine Affordable Housing Conference October 30th, 2007 Portland, ME

Petersen Engineering 2007 1

Petersen Engineering 2007 2 25 Btuh/sf Heat Loss .6 air changes/hour, 12 ACH50pa Infiltration 4" rigid polyisocyanurate Roof 6" batt Garage Ceiling metal stud/batt fill Walls - Door 2-glaze low-e Glass Base Case Component Construction Assumptions

3 [Btu/hr/ft 2 ] 25 Load per Ft 2 [Btu/hr] 488,107 Building Peak Heat Load [Btu/hr-°F] 6,973 Building UA-Value 151,900 2,170.0 0.6 200,000 10.5 Infiltration Heat Loss [Btu/hr] UA- Equiv. [Btu/hr-°F] Infiltration Rate [ACH] Building Volume [CF] Flr-toFlr Height [FT] 20,507 293.0 900 Ventilation Heat Loss [Btu/hr] UA- Equiv. [Btu/hr-°F] Ventilation Rate [CFM] 19,625.0 Total Conditioned Floor Area 16,800 240.0 0.040 25.0 6,000.0 Roof 42,000 600.0 0.100 10.0 6,000.0 Garage Clg 164,500 2,350.0 0.250 4.0 9,400.0 Net Wall 0 0.0 0.400 2.5 0.0 Door 92,400 1,320.0 0.400 2.5 3,300.0 Window 12,700.0 Gross Wall Heat Loss [Btu/hr] UA- Value [Btu/hr-°F] U-Value [Btu/hr-[SF-°F] R-Value [hr-SF-[°F/Btu] Area[SF] 20 Floor to Ground ΔT 50 Ground Temperature 70 Indoor Design Temp 70 ΔT 0 Outdoor Design Temp Calculated values are shown in blue Input values are shown in yellow Base Case - conventional construction Petersen Engineering - 2007 Portland Maine Project

Petersen Engineering 2007 5 11 Btuh/sf 25 Btuh/sf Heat Loss .2 ACH, 4ACH50pa .6 ACH, 12ACH50pa Infiltration 8" cont. rigid polysio. 4" rigid polyisocyanurate Roof 3" cont. rigid polyiso. 6" batt Garage Ceiling 3" cont. rigid polyiso. metal stud/batt fill Walls - - Door better 2-glaze low-e 2-glaze low-e Glass Case 1 Base Case Component Construction Assumptions

6 [Btu/hr/ft 2 ] 11 Load per Ft 2 [Btu/hr] 215,201 Building Peak Heat Load [Btu/hr-°F] 3,074 Building UA-Value 50,633 723.3 0.2 200,000.00 10.5 Infiltration Heat Loss [Btu/hr] UA- Equiv. [Btu/hr-°F] Infiltration Rate [ACH] Building Volume [CF] Flr-toFlr Height [FT] 20,507 293.0 900 Ventilation Heat Loss [Btu/hr] UA- Equiv. [Btu/hr-°F] Ventilation Rate [CFM] 19,625.0 Total Conditioned Floor Area 8,400.0 120.0 0.020 50.0 6,000.0 Roof 22,105.3 315.8 0.053 19.0 6,000.0 Garage Clg 36,555.6 522.2 0.056 18.0 9,400.0 Net Wall 0.0 0.0 0.333 3.0 0.0 Door 77,000.0 1,100.0 0.333 3.0 3,300.0 Window 12,700.0 Gross Wall Heat Loss [Btu/hr] UA- Value [Btu/hr-°F] U-Value [Btu/hr-[SF-°F] R-Value [hr-SF-[°F/Btu] Area [SF] 20 Floor to Ground ΔT 50 Ground Temperature 70 Indoor Design Temp 70 ΔT 0 Outdoor Design Temp Calculated values are shown in blue Input values are shown in yellow Proposed Case 1 - Increased R-values/Decreased Infiltration Petersen Engineering 2007 Portland Maine Project

Petersen Engineering 2007 8 6 Btuh/sf 11 Btuh/sf 25 Btuh/sf Heat Loss .1 ACH, 2 ACH50pa .2 ACH, 4 ACH50pa .6 ACH, 12 ACH50pa Infiltration 8" cont. rigid polysio. 8" cont. rigid polysio. 4" rigid polyisocyanurate Roof 3" rigid + 6" batt 3" cont. rigid polyiso. 6" batt Garage Ceiling 3" rigid + cavity fill cellulose 3" cont. rigid polyiso. metal stud/batt fill Walls - - - Door 3-glaze fiberglass frame/reduce area better 2-glaze low-e 2-glaze low-e Glass Case 2 Case 1 Base Case Component Construction Assumptions

9 [Btu/hr/ft 2 ] 6 Load per Ft 2 [Btu/hr] 118,215 Building Peak Heat Load [Btu/hr-°F] 1,689 Building UA-Value 25,317 361.7 0.1 200,000 10.5 Infiltration Heat Loss [Btu/hr] UA- Equiv. [Btu/hr-°F] Infiltration Rate [ACH] Building Volume [CF] Flr-toFlr Height [FT] 20,507 293.0 900 Ventilation Heat Loss [Btu/hr] UA- Equiv. [Btu/hr-°F] Ventilation Rate [CFM] 19625.0 Total Conditioned Floor Area 8,400 120.0 0.020 50.0 6,000.0 Roof 14,483 206.9 0.034 29.0 6,000.0 Garage Clg 22,909 327.3 0.030 33.0 10,800.0 Net Wall 0 0.0 0.333 3.0 0.0 Door 26,600 380.0 0.200 5.0 1,900.0 Window 12,700.0 Gross Wall Heat Loss [Btu/hr] UA- Value [Btu/hr-°F] U-Value [Btu/hr-[SF-°F] R-Value [hr-SF-[°F/Btu] Area [SF] 20 Floor to Ground ΔT 50 Ground Temperature 70 Indoor Design Temp 70 ΔT 0 Outdoor Design Temp Calculated values are shown in blue Input values are shown in yellow Proposed Case 2 - Increased R-values/Very Low Infiltration/Best Windows/Reduced Window Area Petersen Engineering 2007 Portland Maine Project

Petersen Engineering 2007 10 James Petersen P.E. Petersen Engineering [email_address]

The 2030 Challenge & Current Energy Efficient Housing

by Petersen Engineering, Inc. on Jun 26, 2009

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