Detailed Energy Study, Commissioning, and M&V Services for the Andrew Jackson & Rachel Jackson State Office Buildings
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Project Summary
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Tennessee Valley Authority
Nashville, TennesseeProject Type:
Investment Grade Audit
Size:
Andrew Jackson Building: 408,000 square feet
Rachel Jackson Building: 215,000 square feet
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Project Details
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In response to high energy costs — averaging $3.09 per square foot per year — the State of Tennessee contracted with Tennessee Valley Authority Energy Services (TVA/ES) to undertake a detailed energy study of the Andrew Jackson and Rachel Jackson State Office Buildings. TVA/ES in turn contracted with Architectural Energy Corporation (AEC) to provide baselining services and energy conservation measure analysis. AEC performed an investment grade audit of both buildings, including the development of calibrated building energy simulation models.
Short-term diagnostic monitoring provided dynamic evaluation of system performance and energy conservation opportunities. Analysis of proposed energy conservation measures revealed an estimated $826,195 per year in savings, or 55% of the current annual energy bill for both state office buildings. At an estimated installed cost of $1,493,841, this suggests a simple payback period of 1.8 years.
Project Highlights
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Investment-grade audit performed to determine envelope, lighting, mechanical, and zone characteristics. Audit included building and system inspections, interviews with facility personnel and building occupants, spot measurements, and document review.
Short-term monitoring of building lighting and HVAC systems established schedules and true system operation, and provided baseline documentation for future measurement and verification of energy savings. Real-time data provided easy to understand operational and scheduling problems and system characteristics.
Proposed energy conservation measures analyzed using DOE-2.1E computerized building energy simulation models. The models allowed for both individual analysis of proposed measures, as well as assessment of the dynamic interaction between measures.
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- Lamp and ballast replacements
- Lighting controls, including time clocks, occupancy sensors, and daylighting
- Installation of a new DDC Energy Management System
- Scheduling of HVAC equipment to better serve occupancy schedules, including zone temperature reset during unoccupied times
- Elimination of simultaneous heating and cooling
- Conversion of the constant volume air distribution system to variable-air-volume operation with variable speed drives
- Replacement of standard and high efficiency motors with premium efficiency models
- Conversion of constant speed chilled water and hot water distribution loops to variable speed pumping
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