As part of the Lighting Retrofit #5, 610 T-12 fixtures in Illini Hall were replaced with more energy-efficient T-8 fixtures. This switch will incur an Annual kWh Savings of 96,185 hours. The simple payback for this project is 3.56 years.
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Projects Updates for Topic: Uncategorized
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Signs have been installed at the prairie plot on the corner of Florida Avenue and Orchard Street. These signs announce the designation of this area as a Prairie Zone. The signs also list the benefits of planting native vegetation-- which increases the habitat for beneficial insects and wildlife, saves energy and reduces CO2 emissions by not using mowers, promotes sustainable landscapes and beautifies the campus, and provides an environment for scientific observation. The signs are funded by the Student Sustainability Committee.
Two intensive summer institutes and a variety of other activities were conducted from 2007-2011 by Dr. Murugesu Sivapalan and a group of colleagues, which resulted in over 60 publications and two journal special sections.
Graduate students and faculty members in this group research subjects related to “hydrologic synthesis.” The group used a patterns-based approach to make conclusions about advancing the predictability of human-induced change propagation through the hydrologic system.
More information is available at http://cwaces.geog.uiuc.edu/news/special_sections.html.
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A proposal of the Energy Dashboard software license and installation, system integration and configuration, and on-site training from InStep was sent to Mike Marquissee on June 8, 2011.
The campus is estimated to have between 1,700 and 1,800 fume hoods in operation at the present time. The majority of these are constant air volume (CAV) hoods without heat recovery that operate continuously. Several hundred variable air volume (VAV) hoods also exist, which are in operation only when the hood sash is raised. These hoods, however, are often operated continuously. Based on a Trane TRACE energy model for a typical fume hood on campus, the cost of conditioning air to replace the air vented by a CAV fume hood over the course of a year is estimated to be approximately $5,500 per year. The energy model also predicts an energy usage for VAV hoods, CAV hoods using heat recovery, and VAV hoods using heat recovery to cost about $2,100, $3,200, and $1,500, respectively. Fewer than 200 of the campus’ 1,700 fume hoods are VAV. These figures provide an opportunity to significantly reduce fume hood energy consumption. If the campus takes into account some portion of fume hoods that utilize VAV or heat recovery, the University can conservatively assume the average cost of hood operation to be $3,750 per year. Using this average cost, the total energy cost that can be attributed to campus fume hoods is roughly 9 percent of the campus total. The University believes the physical number of fume hoods in operation can be reduced by 20 percent to 25 percent. This is based on the fact that many rooms have multiple hoods that do not require simultaneous use, and that many of these fume hoods are currently used for chemical storage and cannot be removed. The remaining fume hoods should all be converted to VAV systems with heat recovery—these can reduce a CAV hood's energy consumption by 70 percent. This strategy will also require an educational component. Groups and individuals will need to be educated on operating hoods correctly and to shut the hood sashes when not in use. The above actions can reduce campus energy consumption by at least 2 percent. Our new target for fume hoods is 2 percent.
The SAIC report derives most of its envelope-related savings from window replacement and roof insulation, assuming that only 1 percent of campus energy can be saved by weatherization. The report did not consider changes such as entry-way retrofits to reduce heat loss during entry and exit or improvements in insulation in areas besides roofs. Additionally, the report made no estimation of chilled water savings due to either weatherization or wall insulation, or any potential savings from decreasing heat gain through roofs due to improved reflectivity or vegetative roofs. Improvements to building envelope, weatherization, improving insulation levels in roofs and other areas, and tightening building infiltration and exfiltration would offer a 4 percent reduction in campus energy use, though more is highly likely. The campus target for envelopes is 1 percent.
Although the SAIC report describes the potential energy savings from behavioral changes in its section on metering, it does not include it in its analysis. The University believes a well designed incentive and education program can reduce campus energy consumption by at least 5 percent. Such a program should seek to ensure that cost savings from energy conservation measures benefit building users (e.g. “energy rebates” to students in high-performing departments, or energy-driven reductions in overhead rates for faculty). In addition, adding real-time energy displays in campus buildings and via electronic media can help promote awareness and incentive for improvement. Many buildings have limited or no control over their thermostat settings. However, the departments that occupy these spaces do get a substantial influence in setting building temperatures and enacting more reasonable settings. This will require behavioral change from the academic units and the building occupants. The target for behavioral changes is 5 percent.
The campus is in the process of retrofitting older T12 fluorescent lighting fixtures by replacing them with more energy-efficient T8 (or T5)fixtures and electronic ballasts. The lighting retrofit proposed in the SAIC report would reduce campus energy consumption by ~1.6 percent; a very small amount of this is due to the use of occupancy sensors and day lighting controls. Extending this retrofit to smaller campus buildings, replacing other lighting fixtures (besides T-12s), and a wide deployment of both occupancy and daylight sensors (which can reduce lighting use by 20 percent to 80 percent depending on location) should be able to provide significantly more energy savings than predicted in the SAIC report. The campus target for lighting is 2 percent.
This category includes conversion from constant air volume reheat to variable air volume, eliminating summer steam usage (reheat), heat recovery, variable speed drives for fans and pumps, and steam system maintenance (including trap replacement and pipe insulation). The target for other HVAC is 12.5 percent.