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Ashok Sekar, Eric Williams, Roger Chen  Joule 

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Presentation on theme: "Ashok Sekar, Eric Williams, Roger Chen  Joule "— Presentation transcript:

1 Changes in Time Use and Their Effect on Energy Consumption in the United States 
Ashok Sekar, Eric Williams, Roger Chen  Joule  Volume 2, Issue 3, Pages (March 2018) DOI: /j.joule Copyright © 2018 Elsevier Inc. Terms and Conditions

2 Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions

3 Figure 1 Annual Changes and 2003 Total Average Time Spent on Select Activities for the US Working Population from 2003 to 2012 Note that units are different for total time use (hr/day) and change in time use (hr/year). Non-residential locations are commercial and public buildings and outdoors. Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions

4 Figure 2 2003 Total and Annual Changes in Average Time Spent by Location for Subpopulations and Total Populations in the United States, 2003–2012 “Unidentified” reflects data where survey respondents did not report locational information. Note that units are different for total time (hr/day) and change in time spent (hr/year). Non-residential locations are commercial and public buildings and outdoors. Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions

5 Figure 3 Decomposition of Energy Use Changes in Residential, Non-residential, and Transport Sectors Including and Not Including Time Use as Explanatory Factor Data on energy use, population, and building area come from national sources. Time use changes data are from Figure 2 results. The intensity effect aggregates factors that are not included in the analysis including energy efficiency at home, weather, and so forth. Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions

6 Figure 4 Changes in Time Spent in Locations for US Households (Total Population) and Effect on Energy Consumption in Different Sectors, 2003–2012 The net change is negative, −1,700 trillion BTU in 2012, due to savings in transportation and non-residential buildings exceeding the residential increase. Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions

7 Figure 5 Input Data for the Decomposition Analysis, 2003–2012
(A) Sector-by-sector primary energy consumption. (B) United States population. (C) Occupied building areas in residential and commercial sectors. Data sources: Bureau of Transportation Statistics,55 Energy Information Administration,57 US Census Bureau.67 Joule 2018 2, DOI: ( /j.joule ) Copyright © 2018 Elsevier Inc. Terms and Conditions

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