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Performance Results for Massachusetts and Rhode Island Deep Energy Retrofit Pilot Community C

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Performance Results for Massachusetts and Rhode Island Deep Energy Retrofit Pilot Community C Performance Results for Massachusetts and Rhode Island Deep Energy Retrofit Pilot Community C. Gates and K. Neuhauser Building Science Corporation March 2014 NOTICE This report was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor any agency thereof, nor any of their employees, subcontractors, or affiliated partners makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or any agency thereof. Available electronically at http://www.osti.gov/bridge Available for a processing fee to U.S. Department of Energy and its contractors, in paper, from: U.S. Department of Energy Office of Scientific and Technical Information P.O. Box 62 Oak Ridge, TN 37831-0062 phone: 865.576.8401 fax: 865.576.5728 email: mailto:[email protected] Available for sale to the public, in paper, from: U.S. Department of Commerce National Technical Information Service 5285 Port Royal Road Springfield, VA 22161 phone: 800.553.6847 fax: 703.605.6900 email: [email protected] online ordering: http://www.ntis.gov/ordering.htm Printed on paper containing at least 50% wastepaper, including 20% postconsumer waste Performance Results for Massachusetts and Rhode Island Deep Energy Retrofit Pilot Community Prepared for: The National Renewable Energy Laboratory On behalf of the U.S. Department of Energy’s Building America Program Office of Energy Efficiency and Renewable Energy 15013 Denver West Parkway Golden, CO 80401 NREL Contract No. DE-AC36-08GO28308 Prepared by: C. Gates and K. Neuhauser Building Science Corporation 30 Forest Street Somerville, MA 02143 NREL Technical Monitor: Cheryn Metzger Prepared under Subcontract No. KNDJ-0-40337-03 March 2014 iii [This page left blank] iv Contents List of Figures ............................................................................................................................................ vi List of Tables ............................................................................................................................................. vii Definitions ................................................................................................................................................. viii Executive Summary ................................................................................................................................... ix 1 Introduction ........................................................................................................................................... 1 2 Background ........................................................................................................................................... 3 2.1 New Construction, Retrofits, and DERs ..............................................................................3 2.2 Previous Work .....................................................................................................................4 2.3 Building Science Corporation and the National Grid DER Pilot Program ..........................5 3 National Grid Deep Energy Retrofit Pilot Program ........................................................................... 6 3.1 Measures and Targets ..........................................................................................................6 3.2 The Community of Retrofits ................................................................................................8 4 Energy Use Results and Analysis..................................................................................................... 18 4.1 Reduction Versus Performance Achieved .........................................................................18 4.2 Site and Source Energy ......................................................................................................19 4.3 On-Site Generation ............................................................................................................19 4.4 Energy Use Data ................................................................................................................19 4.4.1 Energy Use Data Normalization and Disaggregation ............................................25 4.5 Characterization of Post-Retrofit Energy Use ...................................................................29 4.5.1 Pre- and Post-Retrofit Energy Use Comparison ....................................................29 4.5.2 Post-Retrofit Energy Use per Household ...............................................................36 4.5.3 Post-Retrofit Energy Use Intensity ........................................................................41 4.6 Impact of Retrofit Package Variations ...............................................................................46 4.6.1 Heating Fuel Source ...............................................................................................46 4.6.2 Included Versus Excluded Basement .....................................................................47 4.6.3 Unvented Versus Vented Attic ..............................................................................50 4.6.4 Airtightness Versus Post-Retrofit Energy Use ......................................................52 4.7 Conclusions of Energy Use Analysis .................................................................................53 5 Airtightness Results and Analysis ................................................................................................... 55 5.1 Airtightness Test Results ...................................................................................................58 5.2 Analysis of Airtightness and DER Package Variations .....................................................62 5.2.1 Inclusion/Exclusion of Basement in Air Control Enclosure ..................................62 5.2.2 Vented/Unvented Attic ..........................................................................................64 5.2.3 Air Control Materials .............................................................................................66 5.3 Airtightness Trends Observed in the DER Community ....................................................72 6 Construction Cost Analysis .............................................................................................................. 73 6.1 Summary of Energy-Related Construction Costs ..............................................................73 6.2 Energy-Related Construction Costs per DER Measure .....................................................83 6.2.1 Attic/Roof DER Measure .......................................................................................83 6.2.2 Exterior Wall DER Measure ..................................................................................83 7 Homeowner Satisfaction .................................................................................................................... 86 8 Conclusions ........................................................................................................................................ 87 References ................................................................................................................................................. 91 Appendix: Homeowner Survey ................................................................................................................ 94 v List of Figures Figure 1. U.S. housing units by decade of construction ........................................................................ 3 Figure 2. Pre- and post-retrofit site energy use for all DER projects .................................................. 30 Figure 3. Pre- and post-retrofit source energy use for all DER projects ............................................. 31 Figure 4. Energy use reduction (percent reduction) achieved in terms of both site and source energy for all DER projects ............................................................................................................... 32 Figure 5. Site energy use percent reduction relative to pre-retrofit site energy use ......................... 33 Figure 6. Source energy use percent reduction relative to pre-retrofit source energy use .............. 33 Figure 7. Site energy use percent reduction relative to pre-retrofit conditioned floor area ............. 34 Figure 8. Source energy use percent reduction relative to pre-retrofit conditioned floor area ........ 34 Figure 9. Site energy use percent reduction relative to pre-retrofit air leakage measurement ........ 35 Figure 10. Source energy use percent reduction relative to pre-retrofit air leakage measurement 35 Figure 11. Site energy use percent reduction relative to approximate year of construction ........... 36 Figure 12. Source energy use percent reduction relative to approximate year of construction ...... 36 Figure 13. Post-retrofit site MMBtu/year per household ......................................................................
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