China
Africa
Explore chapters and articles related to this topic
The Psychology of Energy Efficiency
Published in Brenda Groskinsky, Climate Actions, 2022
Some aspects of energy efficiency offer almost astonishingly high returns on investment, or “bang for the buck.” Compact fluorescent lamp (CFL) light bulbs are so much more efficient than the old incandescent bulbs that they pay for themselves in as little as nine months. Residential light-emitting diodes (LEDs) bulbs, especially ENERGY STAR rated products, use at least 75% less energy and last 25 times longer than incandescent lighting (U.S. Department of Energy Office of Energy Efficiency and Renewable Energy, 2021). In 2013, BTG found that kits containing water efficiency devices, such as high-efficiency showerheads and faucet aerators, would pay for themselves within three weeks. An US$11 kit installed by the homeowner saves a busy household at least US$15 on their next water bill, according to our anecdotal evidence.
Lighting
Published in Stephen A. Roosa, Steve Doty, Wayne C. Turner, Energy Management Handbook, 2020
Eric A. Woodroof, Stan Walerczyk, Fred Hauber
Compact fluorescent lamps (CFLs) are energy efficient, long lasting replacements for some incandescent lamps. CFLs (like all fluorescent lamps) are composed of two parts, the lamp and the ballast. The short tubular lamps can last longer than 8,000 hours. The ballasts (plastic component at the base of tube) usually last longer than 60,000 hours. Many CFLs can be purchased as self-ballasted units that can be used in existing incandescent sockets. For simplicity, this chapter refers to a CFL as a lamp and ballast system. CFLs are available in many styles and sizes.
*
Published in Barney L. Capehart, Wayne C. Turner, William J. Kennedy, Guide to Energy Management, 2020
Barney L. Capehart, Wayne C. Turner, William J. Kennedy
LEDs are “directional” light sources, which means they emit light in a specific direction, unlike incandescent and compact fluorescent bulbs, which emit light and heat in all directions. For this reason, LED lighting is able to use light and energy more efficiently in many applications. However, it also means that sophisticated engineering is needed to produce an LED light bulb that shines light all around like an incandescent A-shape bulb. Incandescent bulbs produce light using electricity to heat a metal filament until it becomes “white” hot or is said to incandesce. As a result, incandescent bulbs release 90% of their energy as heat. In a CFL, an electric current flows between electrodes at each end of a tube containing gases. This reaction produces ultraviolet (UV) light and heat. The UV light is transformed into visible light when it strikes a phosphor coating on the inside of the bulb.
A multi-variable building energy optimization: assessing the role of energy efficient lighting technology in changing the optimal window-to-wall ratio in an office building
Published in International Journal of Sustainable Energy, 2022
Compact fluorescent light (CFL) is another efficient light source that provides a visible spectrum of light by the transition of current through the mercury vapour that is contained in the light bulb (Matvoz and Maksic 2008). CFL sources are about 60–80% more efficient than incandescent lamps and will last about 20 times as long (Baleja et al. 2015). According to Khan and Abas, a 23-Watt compact fluorescent produces the same luminous flux as a 100-Watt incandescent light source (Khan and Abas 2011). However, the CFL is generally considered less efficient than LED lamps.