Your Selections

Sun and solar
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Digital Automotive AC Pulldown Prediction in a Real Driving Condition

Dassault Systemes Simulia-Vijaisri Nagarajan
Dassault Systemes, Simulia Corp-Chin-Wei Chang, Kamalesh Bhambare, Adrien Mann, Edward Tate, Abdelhakim Aissaoui
  • Technical Paper
  • 2019-01-5090
Published 2019-12-30 by SAE International in United States
Automotive Original Equipment Manufacturers (OEMs) are always striving to deliver fast Air-Conditioning (AC) pulldown performance with consistent distribution of cabin temperature to meet customer expectations. The ultimate test is the OEM standard, called “AC Pull Down,” conducted at high ambient temperature and solar load conditions with a prescribed vehicle drive cycle. To determine whether the AC system in the vehicle has the capacity to cool the cabin, throughout the drive cycle test, cabin temperature measurements are evaluated against the vehicle target. If the measured cabin temperatures are equal or lower than the required temperatures, the AC system is deemed conventional for customer usage.In this paper, numerical predictions of the cabin temperatures to replicate the AC pulldown test are presented. The AC pulldown scenario is carried out in a digital Climatic Wind Tunnel simulation. The solution used in this study is based on a coupled approach. With this method, convection is solved using PowerFLOW, a Lattice Boltzmann Method (LBM)-based flow solver, while conduction/radiation are solved using PowerTHERM thermal solver. Cooling loads, reproducing a drive cycle with…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Aerospace & Defense Technology: December 2019

  • Magazine Issue
  • 19AERP12
Published 2019-12-01 by SAE International in United States
Engineered Solutions for Enclosure Sealing and InsulationTips for Reducing Error When Using Eddy Current Measuring TechniquesReducing the High Cost of TitaniumStreamlining Post-Processing in Additive ManufacturingSoftware-Defined Analog Filters: A Paradigm Shift in Radio Filter Performance and CapabilitySDR Interface for the NeXtRAD Multistatic Radar SystemElectrodeposition of Metal Matrix Composites and Materials Characterization for Thin-Film Solar Cells Metal matrix composites, which consist of silver-multiwalled carbon nanotube-silver, layer-by-layer stacks, can electrically bridge the cracks (>40 μm) that appear in semiconductor substrates and the composite grid lines.Sensing Applied Load and Damage Effects in Composites with Nondestructive Techniques Comparing and correlating piezoelectrically induced guided waves, acoustic emission, thermography, and X-ray imaging to determine the effects of applied load on a composite structure.Technology Impact Forecasting for Multi-Functional Composites Multi-functional composites offer a possible solution to the conflicting design goals of making new aircraft lighter, stronger, faster, and more environmentally sustainable.Molecular Engineering for Mechanically Resilient and Stretchable Electronic Polymers and Composites Establishing the design criteria for elasticity and ductility in conjugated polymers and composites by analysis of the structural determinants of the mechanical…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Natural and Artificial Weathering of Automotive Leather, Leatherette and Textile

Mahindra & Mahindra, Ltd.-Elavarasan Palaniappan
Published 2019-10-11 by SAE International in United States
This paper presents the natural and artificial weathering behavior of different soft skin materials such as leather, leatherette and textiles used for automotive seat cover applications. The objective of this study was to understand the physical and aesthetical changes occurring at these flexible materials under sun UV light and heat exposure. The natural weathering study under glass exposure was carried out as per ASTM G 24 at natural weathering site location and artificial weathering as per SAE J2412 at lab. The material was observed for surface changes such as color, texture, crack and physical changes like flexibility and hardness during the exposure. The sample exposed at natural weathering data for every 15 days were recorded, and artificial weathering for every 100 hours were recorded. Light and dark color materials were tested to understand the effect of color and UV light resistance as well as various textures were studied to understand the effect of various texture and texture retention under UV.The study was also carried out at two different period in a year and the data…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Modulation Strategy for Minimization of Leakage Current in Grid-Connected PV Panels

SRM Institute Of Science And Technology-Anitha Daniel, Uthra Rangarajan, Kalaiarasi Nallathambi
Published 2019-10-11 by SAE International in United States
This paper presents a switching strategy for the cascaded multilevel H bridge inverter of five levels to reduce the leakage current in the grid-connected transformerless PV system. Minimization of the leakage current in solar panels is vital in transformerless grid-connected PV panels. But due to the absence of transformers which provide galvanic isolation, CMV techniques are applied to reduce leakage currents from PV panel to ground. This current causes hazards to humans and large currents above 300mA may lead to fire hazards. The proposed switching strategy reduces the continuous transients at switches, hence avoiding high frequency switching. This switching technique requires only a single modified carrier wave for all 2m+1 levels of operation. The sinusoidal carrier waveform is modified as a humped sinusoidal waveform with to reduce switching losses. In this paper, the switching strategy with the modified sinusoidal carrier has been incorporated to PV fed five level multilevel inverters connected to the grid and its effectiveness has been validated.
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Amelioration of Modular Mobility by Adopting Split Cell Solar Panel Cleaning and Cooling Thereof

Sri Krishna College of Engg. and Tech.-Soundararajan Ranganathan, Ajith Raja, Arunpragash Mohana Sundaram, Ashwanth Pranav Selvamani
Published 2019-10-11 by SAE International in United States
In the photovoltaic system, the efficiency of solar cells is determined by the combination of latitude and climate. The electricity generation in the photovoltaic cell is more in the morning time than in the afternoon time. This is due to the fact that an increase in solar cell temperature leads to a decrease in efficiency of the solar panel. This work aims to provide necessary cooling to the solar panel for favorable output during noon time. Normally electrical modular vehicles use non-split cell solar panels. In order to increase the efficiency, we are using a split cell solar panel as it increases the voltage by halving the size of the silicon chips. Thus, having the cells results in increasing efficiency and lowering the operation temperature. The solar panel should be maintained at a particular temperature by adopting sprinkling of water method in solar panel for hybrid vehicles. The proposed system consists of a storage tank, radiator, temperature sensor, water sprinkle jets attached to the hybrid vehicle. When the temperature increases beyond the limit, the temperature…
This content contains downloadable datasets
Annotation ability available

Rose-Inspired Device Collects and Purifies Water

  • Magazine Article
  • TBMG-35276
Published 2019-10-01 by Tech Briefs Media Group in United States

A new device, inspired by a rose, inexpensively collects and purifies water. The device is a new approach to solar steaming for water production — a technique that uses energy from sunlight to separate salt and other impurities from water through evaporation.

Chip Converts Wasted Heat to Usable Energy

  • Magazine Article
  • TBMG-35259
Published 2019-10-01 by Tech Briefs Media Group in United States

Car engines, laptop computers, cellphones, and refrigerators all heat up with overuse. That heat can be captured and turned into energy using a method that produces electricity from heat. The technology uses a silicon chip, also known as a “device,” that converts more thermal radiation into electricity. This could lead to devices such as laptop computers and cellphones with much longer battery life and solar panels that are much more efficient at converting radiant heat to energy.

Products of Tomorrow: October 2019

  • Magazine Article
  • TBMG-35286
Published 2019-10-01 by Tech Briefs Media Group in United States

This column presents technologies that have applications in commercial areas, possibly creating the products of tomorrow. To learn more about each technology, see the contact information provided for that innovation.

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Air Conditioning Systems for Subsonic Airplanes

AC-9 Aircraft Environmental Systems Committee
  • Aerospace Standard
  • ARP85G
  • Current
Published 2019-09-25 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) contains guidelines and recommendations for subsonic airplane air conditioning systems and components, including requirements, design philosophy, testing, and ambient conditions. The airplane air conditioning system comprises that arrangement of equipment, controls, and indicators that supply and distribute air to the occupied compartments for ventilation, pressurization, and temperature and moisture control. The principal features of the system are: a A supply of outside air with independent control valve(s). b A means for heating. c A means for cooling (air or vapor cycle units and heat exchangers). d A means for removing excess moisture from the air supply. e A ventilation subsystem. f A temperature control subsystem. g A pressure control subsystem. Other system components for treating cabin air, such as filtration and humidification, are included, as are the ancillary functions of equipment cooling and cargo compartment conditioning. The interface with the major associated system, the pneumatic system (Chapter 36 of ATA 100) is at the inlet of the air conditioning shutoff valves. This boundary definition aligns with that in the…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

SAE Aerospace Applied Thermodynamics Manual Aerothermodynamic Systems Engineering and Design

AC-9 Aircraft Environmental Systems Committee
  • Aerospace Standard
  • AIR1168/3A
  • Current
Published 2019-09-24 by SAE International in United States
This section presents methods and examples of computing the steady-state heating and cooling loads of aircraft compartments. In a steady-state process the flows of heat throughout the system are stabilized and thus do not change with time. In an aircraft compartment, several elements compose the steady-state air conditioning load. Transfer of heat occurs between these sources and sinks by the combined processes of convection, radiation, and conduction in the following manner: 1 Convection between the boundary layer and the outer airplane skin. 2 Radiation between the external skin and the external environment. 3 Solar radiation through transparent areas directly on flight personnel and equipment and on the cabin interior surfaces. 4 Conduction through the cabin walls and structural members. 5 Convection between the interior cabin surface and the cabin air. 6 Convection between cabin air and flight personnel or equipment. 7 Convection and radiation from internal sources of heat such as electrical equipment. The subsequent paragraphs discuss methods of determining each of the heat transfer rates listed above, as well as the physiological considerations involved…
This content contains downloadable datasets
Annotation ability available