Electric school buses that power grid could save school districts millions
Electric school buses that feed the power grid could save school districts millions of dollars — and reduce children’s exposure to diesel fumes — based on recent research by the University of Delaware’s College of Earth, Ocean, and Environment (CEOE).
A new study examines the cost-effectiveness of electric school buses that discharge their batteries into the electrical grid when not in use and get paid for the service. The technology, called vehicle-to-grid (V2G), was pioneered at UD and is being tested with electric cars in a pilot project.
Adapting the system for school bus fleets is a logical application. School buses generally travel distances within electric vehicles’ battery range, and they are not in use for much of the day. Electric school buses also do not release sooty diesel exhaust, which contains pollutants that can cause respiratory irritation, lung cancer and heart disease.
“I see neighborhood kids waiting for and riding school buses out my window or when walking my dog,” said Jeremy Firestone, CEOE professor of marine policy and director of the Center for Carbon-free Power Integration. “Electric buses have the benefit of kids not standing around or having their windows open while diesel fumes are being released.”
For the study, researchers analyzed existing diesel school bus routes in a mid-sized suburban school district in Delaware and calculated the costs and benefits of V2G-capable electric bus replacements. Over 14 years, which is the typical lifespan of a bus, a V2G electric bus fleet could save an estimated $38 million.
“I was surprised,” said study lead author Lance Noel. “The savings go through the roof.”
The economic research took into account costs associated with fuel, electricity and batteries, as well as pollution-related health care expenses and other factors.
A diesel bus costs $110,000, compared with $260,000 for an electric bus equipped with a V2G-capable, 70-kilowatt on-board charger. Diesel buses have an average fuel economy of 6 miles per gallon, including the effects of idling, and emit soot, ozone, sulfur dioxide, nitrous oxide and other pollutants. These fumes can be disproportionately higher within the cabin of a bus compared to surrounding pollution levels.
Add up diesel gas costs plus the medical expenses to society, and the diesel bus looks less cost-effective over time. Electric buses providing V2G services, meanwhile, cover the battery charging and additional capital investment costs, and in addition generate profits while releasing no tailpipe pollution.
Choosing a V2G-capable electric bus over a diesel bus would save a school district $6,070 per bus seat, or $230,000 per bus over the vehicle’s 14-year lifespan. Even with taking out the medical and climate change costs associated with diesel pollution, school districts could still save $5,700 per seat.
“They could save a large amount of money while also shifting away from the consumption of diesel and enhancing school children’s health,” the authors write in the paper.
There is still a way to go before such V2G-capable school buses become a reality, however. Electric school buses are uncommon, with the first Trans Tech all-electric school bus tested in California earlier this year.
While electric school buses can be cost-competitive without providing V2G services, the V2G technology would produce substantially larger savings for school districts.
“The V2G capability is what changes the economics of the school bus,” said study co-author Regina McCormack, who along with Noel is a graduate student in CEOE’s School of Marine Science and Policy.
The study, titled “A Cost Benefit Analysis of a V2G-Capable Electric School Bus compared to a Traditional Diesel School Bus,” appears in the Aug. 1 issue of Applied Energy.
Andrea Boyle Tippett | newswise
Linear potentiometer LRW2/3 - Maximum precision with many measuring points
17.05.2017 | WayCon Positionsmesstechnik GmbH
First flat lens for immersion microscope provides alternative to centuries-old technique
17.05.2017 | Harvard John A. Paulson School of Engineering and Applied Sciences
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy