The conversion of helioenergetics into an independent and important technological field is discussed. Outstanding scientists of the world, including Frederic Joliot-Curie, feel that helioenergetics will be put on an equal footing with the study of atomic energy. In this connection scientists await further research.
Published on 03/20/2018
Document details: 10 pages. 9 downloads.
NASA Technical Reports Server (NTRS) 19690000543: Balloon batteries, charged and heated by solar energy
Shielded heat-of-fusion material envelope collects and stores solar heat to maintain temperature during the night cycle at 30,000 feet. Spiral-wound fluoroplastic film structure has low density to avoid damage to aircraft in case of impact.
Published on 07/03/2016
Document details: 2 pages. 9 downloads.
DTIC ADA553549: Piezoelectric, Solar and Thermal Energy Harvesting for Hybrid Low-Power Generator Systems With Thin-Film Batteries
The harvesting of ambient energy to power small electronic components has received tremendous attention over the last decade. The research goal in this field is to enable self-powered electronic components for use particularly in wireless sensing and measurement applications. Thermal energy due to temperature gradients, solar energy and ambient vibrations constitute some of the major sources of energy that can be harvested. Researchers have presented several papers focusing on each of these topics separately. This paper aims to develop a hybrid power generator and storage system using these three sources of energy in order to improve both structural multifunctionality and system-level robustness in energy harvesting. A multilayer structure with flexible solar, piezoceramic, thin-film battery and metallic substructure layers is developed (with the overhang dimensions of 93 mm x 25 mm x 1.5 mm in cantilevered configuration). Thermal energy is also used for charging the thin-film battery layers using a 30.5 mm x 33 mm x 4.1 mm generator. Performance results are presented for charging and discharging of the thin-film battery layers using each one of the harvesting methods. It is shown based on the extrapolation of a set of measurements that 1 mA h of a thin-film battery can be charged in 20 min using solar energy (for a solar irradiance level of 223 W m-2), in 40 min using thermal energy (for a temperature difference of 31 deg C) and in 8 h using vibrational energy (for a harmonic base acceleration input of 0.5g at 56.4 Hz).
Published on 08/28/2018
Document details: 14 pages. 9 downloads.
Fuel economy has become a major concern due to the increase of oil price. Moreover, the availability of fuels is limited and depleting as the consumption is increasing. Renewable energy became a solution to this entire dilemma. Solar energy represents one of the best alternative energy available to mitigate these challenges. This paper studies the potential of using solar Photovoltaic system onboard of an ongoing ship as an auxiliary power. Photovoltaic panels are supposed to be installed on the deck of the ship. The Average Annual Cost (AAC) due to installing the solar panels are calculated and compared with the fuel cost. Simple curves are introduced to be used to estimate the PV area, number of batteries required and the AAC for solar system. The study showed that using solar energy, as an auxiliary power, will reduce the annual cost of the ship and above all it is an environmental friendly solution which reduces the carbon emissions of the ship.
Published on 09/19/2014
Document details: 14 pages. 173 downloads.
Variously doped cadmium sulfide was grown in single crystal and polycrystalline form, contacted on one side with indium and a barrier electrode formed on the opposite face. The barrier electrode, while its exact nature is unknown, consisted of copper and cuprous oxide, which was processed to give a photovoltaic response. Such cells were used as solar energy converters. Energy conversion efficiencies up to 1% were obtained and batteries of cells were constructed which delivered about 100 milliwatts when illuminated with light equivalent to sunlight outside the earth's atmosphere.
Published on 12/17/2017
Document details: 59 pages. 10 downloads.
Published on 08/20/2015
Document details: 442 pages. 7 downloads.
Published on 12/10/2018
Document details: 294 pages. 8 downloads.
NASA Technical Reports Server (NTRS) 19870001641: Sodium-sulfur batteries for spacecraft energy storage
Power levels for future space missions will be much higher than are presently attainable using nickel-cadmium and nickel-hydrogen batteries. Development of a high energy density rechargeable battery is essential in being able to provide these higher power levels without tremendous weight penalties. Studies conducted by both the Air Force and private industry have identified the sodium-sulfur battery as the best candidate for a next generation battery system. The advantages of the sodium-sulfur battery over the nickel-cadmium battery are discussed.
Published on 09/17/2016
Document details: 12 pages. 9 downloads.
Decreasing prices of photovoltaics (PV) and Lithium-ion batteries are creating a significant momentum for off-grid Zero Energy Buildings (ZEBs). In literature, most researchers have focused on grid-connected ZEBs built on site. This literature review is written with factory-made off-grid ZEBs in mind. High investment costs, poor construction quality and problems to achieve ZEB in real operation are three challenges that ZEB buildings currently face. This article discusses how automated mass production of continually improved standardized modules can overcome those problems. A shipping container is chosen as the modular unit to take advantage of the existing transport infrastructure. Due to the narrow width, the potential for utilizing daylight is better than that of traditional buildings. Off-grid ZEBs mean that the user must achieve ZEB in real operation, including plug loads. The local energy generation is likely to motivate the users to learn more about renewable energy. Plug loads is the largest energy consumer in buildings but are still often overlooked in ZEB definitions. With the Belt and Road initiative and political incentives to increase industrialized construction in China, the premises for exporting container buildings to the main markets in Asia and Africa are improving.
Published on 07/06/2019
Document details: 12 pages. 1 download.
A detailed discussion of the U.S. Coast Guard aids to navigation application of solar photovoltaics with an emphasis on energy storage by lead-acid batteries is presented. A methodology is developed for the prediction of performance of a lead-acid battery in low-rate photovoltaic charging. Experimental results from five years of solar photovoltaic charging of lead-antimony grid batteries at various levels of voltage regulation are discussed. A two-level, two-factorial experiment with pure-lead grid batteries is analyzed. An experimental comparison is made between pure-lead grid and lead-calcium grid batteries. The results of temperature-controlled zener diode voltage regulator testing are presented. All three grid types of lead-acid batteries were found to be acceptable for aids to navigation usage with different constraints on voltage regulation and maintenance needed for each type. A final discussion is presented on the considerations for the operational deployment of solar photovoltaic-powered aids to navigation. (Author)
Published on 12/11/2017
Document details: 73 pages. 10 downloads.