Assessments - 3, GPA: 3.7
(
)
)
|
Facilidade de uso
Clothes Washers Performance Requirement for Federal Purchases Washer Capacity Modified Energy Factora 1.6 to 3.5 cu. ft. 1.42 or more a) Modified Energy Factor (MEF) is the number of cubic feet of clothes washed and dried per kilowatt hour (kWh) of electricity used. MEF is calculated by dividing the tub capacity by the total energy (clothes washer, water heater and dryer) used per wash load (10 CFR 430, sub-part B, Appendix J). Buying Energy-Efficient Clothes Washers When buying residential and family-size commercial clothes washers use the Modified Energy Factor (MEF) instead of the annual energy consumption (kWh/ year) shown on the yellow EnergyGuide label. While both measures include the energy used by the washer and water heater, MEF adds that used by the dryer. Since some clothes washers are more effective at spinning moisture from clothing, resulting in less time and energy needed for drying, MEF is a more accurate indicator of performance. Specify or select products that are ENERGY STAR-qualified (see For More Information), all of which meet the MEF shown in the Performance Requirement table. Family-sized commercial clothes washers are similar to residential clothes washers in size, performance, features, and connections. The commercial products have sturdier frames and mechanical components, a modified control panel with fewer control settings, and feature a coin box, debit card reader or other revenue collecting device. Performance requirements apply to all forms of procurements, including: guide and project specifications; construction, renovation, repair, maintenance and energy service contracts, lease agreements and solicitations for offers. Energy performance requirements should be included in all evaluations of solicitation responses. Model language to assist agencies with incorporating these performance requirements into their procurement documents is available at The federal supply source for clothes washers is the General Services Administration (GSA), which sells them through its Multiple Awards Schedules program and on-line shopping network, GSA Advantage! Note that not all clothes washers sold by GSA are ENERGY STAR-qualified and some that do qualify may not be indicated as such. When buying clothes washers through this source, check the make and model number against the list of qualified products on the ENERGY STAR web site to assure they meet this Specification. User Tips A substantial amount of the energy used for clothes washing is for heating the water. Selecting cold water wash cycles will save energy; appropriate load-size settings will save both water and energy. ENERGY STAR- qualified clothes washers use less water than standard models while cleaning just as well. FEMP Designated Product: Clothes Washers In areas with limited water supplies, consider buying products with low water factors (WF), a performance metric for comparing clothes washer water consumption independent of capacity. WF is the total water used per cycle divided by the machine’s capacity (in cu. ft.). A lower value indicates a more efficient clothes washer. While ENERGY STAR does not currently include WF in its performance criteria, the Department of Energy (DOE) is proposing to add it in January 2007. The Consortium for Energy Efficiency (see For More Information) includes WF in its list of qualifying products. Cost-Effectiveness Example Performance Base Modela Required Best Availableb Modified Energy Factor 1.04 1.42 2.34 Annual Electricity Usec 1,250 kWh 917 kWh 556 kWh Annual Energy Cost $75 $55 $33 Lifetime Energy Cost $720 $530 $320 Water Factor (gallons/cu. ft./cycle) 11.1 10.5 3.6 Annual Water Use 14,400 gallons 13,700 gallons 4,750 gallons Annual Water & Sewer Cost $58 $55 $19 Lifetime Water & Sewer Cost $610 $580 $200 Lifetime Utilities Costd $1,330 $1,110 $520 Lifetime Utilities Cost Savings -$220 $810 a) The efficiency (MEF) of the Base Model is the minimum allowed by current US DOE appliance standards. b) More efficient products may have been introduced to the market since this specification was published. Information on the best available model was obtained from the ENERGY STAR residential clothes washers products list (see For More Information). c) Includes energy for washing, drying and water heating. This value is not the same as that shown on the EnergyGuide label. d) Lifetime utilities cost is the sum of the discounted value of the annual electricity, water, and sewer costs based on average usage and an assumed clothes washer life of 13 years. Future energy price trends and a discount rate of 3.0% are based on federal guidelines (effective from April, 2005 to March, 2006). Future water and sewer costs are conservatively assumed to increase only at the rate of inflation. Cost-Effectiveness Assumptions In this example, annual energy use is calculated with the standard DOE test procedure for a residential clothes washer with a 3.3 cu...