Kansas Department of Transportation enterprise energy and carbon accounting and utility usage research phase 2B : improving energy and fuel efficiencies in KDOT operations.
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Kansas Department of Transportation enterprise energy and carbon accounting and utility usage research phase 2B : improving energy and fuel efficiencies in KDOT operations.

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    Reducing the environmental impact of facilities and operations has become an important function for many organizations. In many

    cases, such as utility and fuel use, reducing these impacts can also be coupled to financial savings. The Kansas Department of Transportation

    (KDOT) has determined that conducting an energy and CO2 audit of its building and vehicle fleets will aid in assessing KDOT energy use,

    prepare for any future regulations regarding CO2 emissions, and help identify areas for increased savings through reduced use of commercial

    resources (primarily energy and fuel). Phase 1 of this project established baseline carbon and energy data from three major sources: the total

    energy embodied in the construction, operation and repair of KDOT-owned buildings, the total energy embodied in KDOT use of utilities

    (electricity, water and natural gas) and the energy expended in the operation of KDOT’s vehicle fleet and other associated equipment. The work

    covered in this report (Phase 2) focused on streamlining and improving access to this information, improving KDOT’s ability to track their data,

    and identifying areas for reducing expenditures on energy and fuel. Related Phase 2 work by Kansas State University to conduct energy audits of

    KDOT buildings is described separately in a report from that institution (published as K-TRAN KSU-12-5).

    Using the compiled data from Phase 1 of this project (site location, buildings, energy use, and building square footage), a web-based

    database was developed to manage information on the energy use and embodied energy of KDOT campuses and individual buildings. This

    database can be used to identify trends of campuses to find under-performing buildings, to aid in the tracking of high performance buildings, and

    also aid in verifying the upgrading of inefficient systems originally found by comparing the database with EIA baseline values. An operational

    energy use simulator (online at http://www2.ku.edu/~sims/cgi-bin/KDOT/index.php) was also developed for KDOT’s long-term meter tracking

    use. This system can show energy use by the state, district, city, county, and zip code. Using these tools and compiled records from the Phase 1

    survey, we developed recommendations for projects to improve KDOT’s energy efficiency and sustainability. These projects include LED

    fluorescent bulb replacements, retrofitting and upgrading existing HVAC systems to demand-controlled ventilation (DCV) systems, the use of

    lower embodied energy materials in new building projects, and changes in employee habits to conserve energy.

    Fuel use by KDOT from fiscal years 2006-2011 was analyzed using a Microsoft Access database created to manage and analyze entries

    more effectively. Analysis of records provided by KDOT showed an overall decreasing trend in total miles traveled and fuel consumed over this

    time period, but an increase in diesel use over the past several years. It also found that replacing older vehicle models with new models does not

    show the expected increase in vehicle fleet efficiency across all major vehicle types in the fleet. This is most likely due to increases in engine

    capacity and fuel consumption for similar model vehicles over the past decade. Using more efficient means of transportation can significantly

    decrease KDOT fuel demand, in particular replacing truck travel with car travel where possible. The report also outlines specific advantages and

    disadvantages of more extensive biodiesel use to meet federal renewable fuel requirements, and recommends specific actions to address potential

    issues that could arise due to biodiesel compatibility problems with some materials and difficulties in cold weather operation.

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