Thanks to considerable cost reductions in photovoltaic modules, solar energy holds increasing appeal for use in the mobility sector. Depending on the type of application, even diesel fuel for trucks can be replaced by photovoltaics to some extent.
Fraunhofer ISE has carried out and evaluated yield analyses of PV power supply for commercial vehicles, such as refrigerated transport vehicles, using real-life solar irradiance data. Based on its findings, the institute sees great potential in this field and is working together with partners from the logistics and automotive sectors to conduct research into special PV modules for use in commercial vehicles.
Principle of the vehicle-integrated PV modules for refrigerated semitrailers developped by Fraunhofer ISE.
The aim is to integrate the modules in the truck roofs to supply power for driving the vehicle or for cooling goods.
Employing photovoltaics in commercial vehicles can contribute to reducing diesel consumption and lowering costs, cutting CO2 emissions from haulage in the process and thus meeting environmental and climate protection targets within the transport sector. “In developing a solar-active vehicle shell, we want to make photovoltaic technology available to the logistic sector and contribute to lowering the cost of logistics as a result,” states Matthieu Ebert, Head of the Team for Module Efficiency and New Concepts at Fraunhofer ISE.
Economic feasibility studies based on real-life solar irradiance data
Whereas other economic sensibility studies conducted on the use of PV in commercial vehicles have, to date, been based on simulations with artificial weather data, working in collaboration with logistics firm Dachser and haulage company Benzinger, Fraunhofer ISE has equipped and commissioned several semitrailers with irradiance sensors, and as a result has been able to measure insolation potential in real-life logistics operations. Irradiance data were collected and analyzed at Fraunhofer ISE for a period of around six months.
A total of six 40 tonne refrigerated semitrailers were fitted with appropriate irradiance sensors and travelled their standard routes in the US and Europe – from Prague to Mallorca, Paris to Munich. The data gathered were then evaluated by Fraunhofer ISE according to a range of criteria. The scientists calculated the savings in liters of diesel per vehicle, as the average of liters of diesel across all routes and vehicles, and in liters of diesel for three geographic regions.
“When you merge the data collected for the roofs that could potentially be fitted with PV modules, this allows you to make reliable statements about the viability of such systems,” says Ebert. “Based on our calculations, we anticipate that a 40 tonne refrigerated semitrailer with a roof area of 36 m2 equipped with PV modules (nominal power of 6 kW) could save up to 1900 L of diesel fuel per year,” he adds.
One important finding of the study, which is to be presented at the European Photovoltaic Solar Energy Conference and Exhibition EU-PVSEC 2017 and the 8th “Lkw und Fuhrpark” (Truck and Vehicle Fleet) Conference, is that the fuel savings, and thus the viability of the initiative, are heavily dependent on vehicle deployment regions and usage scenarios. In future, the insights gained from the measurement campaign will allow Ebert and his team to advise logistics companies on questions regarding the economic viability of using PV, and on the PV technology that is most suited to their needs.
Custom design for vehicle-integrated PV module
In order to minimize any additional load on the refrigerated semitrailers, vehicle-integrated PV modules need to be developed that are as lightweight and efficient as possible. Furthermore, a unique design will be required to enable the PV modules to be fitted to vehicle roofs without exceeding the maximum vehicle heights permitted under road traffic regulations. Such modules must be extremely compact and able to withstand dynamic mechanical stress caused, for example, by vibrations during travel.
Fraunhofer ISE is supporting the development of lightweight modules by contributing its many years of expertise in module technology and testing. Specialist synergies at the research institute in the fields of power electronics and systems technology help in developing all the necessary components, and in ensuring that they interact properly within the overall system.
PV modules and systems can also be tested under real conditions in transport operations. Ebert and his team at Fraunhofer ISE offer field tests to interested companies and collaborative partners in the logistics and vehicle construction sectors. The test results can then be used as a basis for individual yield analyses and for calculating savings potential.
The project was funded by the Fraunhofer Zayed Program and carried out in collaboration with Fraunhofer CSE in Boston.
Karin Schneider | Fraunhofer-Institut für Solare Energiesysteme ISE
How electric heating could save CO2 emissions
17.12.2018 | Technische Universität München
Data use draining your battery? Tiny device to speed up memory while also saving power
14.12.2018 | Purdue University
Researchers from the University of Basel have reported a new method that allows the physical state of just a few atoms or molecules within a network to be controlled. It is based on the spontaneous self-organization of molecules into extensive networks with pores about one nanometer in size. In the journal ‘small’, the physicists reported on their investigations, which could be of particular importance for the development of new storage devices.
Around the world, researchers are attempting to shrink data storage devices to achieve as large a storage capacity in as small a space as possible. In almost...
The more objects we make "smart," from watches to entire buildings, the greater the need for these devices to store and retrieve massive amounts of data quickly without consuming too much power.
Millions of new memory cells could be part of a computer chip and provide that speed and energy savings, thanks to the discovery of a previously unobserved...
What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...
A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.
The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...
A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.
Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...
12.12.2018 | Event News
10.12.2018 | Event News
06.12.2018 | Event News
18.12.2018 | Materials Sciences
18.12.2018 | Physics and Astronomy
18.12.2018 | Physics and Astronomy