Space Conditioning Project Team
Commercial space conditioning (heating, cooling, and ventilation) accounts for about 7.0 quads of primary energy per year, or about 40% of total commercial use. Fortunately, there are many cost-effective opportunities to reduce space conditioning energy use, such as tuning up existing systems, reducing supplemental energy loads to minimize the burden on heating and cooling systems, and replacing older equipment with new, high-efficiency equipment. Commercial Building Energy Alliances (CBEA) Space Conditioning Project Team members work with DOE's national laboratories and with each other to deploy these and other energy-saving space-conditioning strategies.
Current Project Team Initiatives
Sample team activities include:
- Verifying performance and energy savings of entries to the High Performance Rooftop Unit Challenge and helping members use the new units in their buildings.
- Rooftop units (RTUs) are used in nearly half of all cooling-conditioned commercial floor space in the United States. RTUs built according to the CBEA specification are expected to reduce energy use by as much as 50%, compared with the current ASHRAE 90.1 standard, depending on location and facility type. Nationwide, if all 10- to 20-ton commercial units were replaced with units built to this specification, businesses would save about $1 billion each year in energy costs.
- DOE also developed an RTU Comparison Calculator, so you can easily compare the energy and financial benefits of high-efficiency units to standard equipment.
- Helping members save energy by using the gas unit heater specification.
- An older gas-unit heater operated for 2,000 hours a year can cost up to $5,700 each year in energy costs. A new heater that meets the specification will use 10% less energy and could save $2,900 over five years in a state with a mild climate such as Tennessee and up to $3,600 in a cold-climate state like New York.
- If all gas-unit heaters in the United States were replaced with heaters built to the energy requirements in this specification, businesses could save 1.6 billion therms of energy, or about $1.3 billion in energy costs per year.
- Demonstrating advanced control strategies for RTUs as a retrofit measure.
- Most building rooftop air conditioning and heating units lack advanced controls. Retrofitting existing systems with such controls can save a significant amount of energy.
- DOE's Pacific Northwest National Laboratory (PNNL) estimates that a typical 25,000 sq. ft. stand-alone retail store could save $7,000 to $24,000 a year (per-unit savings range from $2,000 to $5,900) and that a typical 45,000 sq. ft. supermarket could save between $16,000 and $52,000 per year (per-unit savings range from $2,700 to $8,700).
- Helping members qualify for tax deductions under 179D via DOE's simplified qualification calculator.
- Many Alliance members noted that it was too difficult to qualify for lighting, space conditioning, and insulation tax deductions under 179D because the costs of modeling savings to qualify for the deduction could potentially outweigh the savings from the deduction. In response, DOE developed this simplified calculator to help you quickly qualify for the deduction. The IRS will accept the results of this calculator tool as proof of qualification.
- Sharing best practices for efficient heating, ventilation, and air conditioning. Members share resources on regular Project Team conference calls.
Resources and Past Initiatives
- Access the DOE Commercial Buildings Resource Database for all DOE publications related to commercial buildings, including space-conditioning resources.
- Use the Commercial Rooftop Unit Comparison Calculator to compare the energy and financial performance of standard versus high-efficiency equipment.
- Quickly qualify for tax deductions with the 179D DOE Calculator.
- Learn how the High-Performance Commercial Window Volume Purchase Program can help you (Presentation is specifically for CBEA members).
- Find procurement resources for high-efficiency products covered by the Federal Energy Management Program (FEMP) purchasing requirements. Although developed for a federal audience, they are also useful and applicable to the private sector, and cover many products not covered by ENERGY STAR®. You can also use the FEMP energy and cost savings calculators for energy efficient products.
- Maximize cost-effective retrofit opportunities with the ENERGY STAR Building Upgrade Manual. This is a strategic guide to help you plan and implement profitable energy-saving building upgrades. You can maximize energy savings by sequentially following the five building upgrade stages. In particular, see Chapter five on retrocommissioning, Chapter eight on air-distribution systems, and Chapter nine on heating and cooling upgrades.