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Application of Phase Change Materials (PCM) for reducing cabin heat load

Tata Motors Ltd-Mayank Manoj Dubey, Suresh Tadigadapa, Abhijit DUBE, Ankit Shukla, Anurag Maurya, Y.S.Sarath Reddy
  • Technical Paper
  • 2020-28-0037
To be published on 2020-04-30 by SAE International in United States
In regions like Indian Subcontinent, Gulf or Saharan & Sub-Saharan Africa, where the sunshine is abundant almost all year round, air-conditioning is an important aspect of vehicles (passenger cars, buses etc). Higher heat means higher cooling demand which means bigger AC system which in turn. Now AC compressor is a parasitic load on the engine like other auxiliaries. Upcoming emission norms will result in more stringent constraints on the power that can be made available to auxiliaries by engine. Moreover, one of the most frequent customer complaint in JD Power rating survey results of passenger vehicles is "AC cooling not fast enough". Hence, the proposed idea suggests a way reduce the air conditioning power consumption, without compromising on the cool-down performance by eliminating the heat load source itself. The best way to beat the heat and reduce cabin heat load is the stop the heat build-up itself. The present paper explores one such mean of reducing cabin heat build-up by leveraging latent heat properties of phase change materials and thus improving the air condition performance.With…
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Impact of different types of glazing on Air- Conditioning system performance of vehicle

Maruti Suzuki India, Ltd.-Akshay Bhateja
  • Technical Paper
  • 2020-01-1249
To be published on 2020-04-14 by SAE International in United States
Due to intense peak summer temperatures and sunny summers in tropical countries like India, achieving the required cabin temperature in vehicle without compromising on fuel efficiency is becoming increasingly challenging. The major source of heat load on vehicle is solar load. Therefore, a study has been conducted to evaluate the heat load on vehicle cabin due to solar radiations and its impact on vehicle Air-Conditioning system performance with various combinations of door glasses and windscreen. The glasses used for this study are classified as Green, Dark Green, Dark Gray, Standard PVB (Polyvinyl Butyral) Windscreen and PVB Windscreen having Infrared Cut particles. For each glass, part level evaluation was done to find out the percentage transmittance of light of different wavelengths and percentage transmittance of heat flux through each glass. To verify the effectiveness of each glass, vehicle level Air-Conditioning system performance test was done in All Weather Chassis Dyno Facility for each retrofitted vehicle. Retrofitted vehicle configurations were decided as per regional visible light transmittance regulations. To eliminate the effect of manufacturing variance while evaluating…
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In-situ studies on the effect of solar control glazings on in-cabin thermal environment for hot and humid climatic zones

Saint Gobain India Pvt., Ltd.-Jyothi Latha Tamalapakula
  • Technical Paper
  • 2020-01-1257
To be published on 2020-04-14 by SAE International in United States
Thermal comfort in a passenger cabin is the basic necessity of an occupant especially in hot and humid climatic conditions. It is known that the reflective glazing solutions provide better thermal comfort inside the cabin due to significant reflection of IR part of solar radiation. However, in hot and humid climatic zones like India, significant reduction in heat load can also be achieved through cost effective solar control absorbing glazings. Thus, the present work aims to study the effect of solar control absorbing glazings on cabin inside temperatures and its impact on thermal comfort of the occupants in tropical climates. A combination of glazing sets with a range of solar energy transmission and absorption values are considered for the study. Indoor soak and cool tests are performed on a sedan model with multiple sets of solar control absorbing glass combinations. A constant ambient temperature of 38˚C and solar radiation of 1000W/m2 are maintained throughout the tests. Wind speed was simulated for a vehicle running speed of 45kmph. Net heat gain inside the cabin as a…
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Spectral Transmission Test

Glazing Materials Standards Committee
  • Ground Vehicle Standard
  • J1796_202003
  • Current
Published 2020-03-11 by SAE International in United States
The scope of this SAE performance standard is to define the test method by which the direct solar and visible transmittance of safety glazing materials for road vehicles shall be measured. Adherence to this performance standard will facilitate writing, use, and referencing of reports by government, industry, and other organizations.
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Polymer Coating Cools Down Buildings

  • Magazine Article
  • TBMG-35972
Published 2020-02-01 by Tech Briefs Media Group in United States

Common cooling methods such as air conditioners are expensive, consume significant amounts of energy, require ready access to electricity, and often require coolants that deplete ozone or have a strong greenhouse effect. An alternative to these energy-intensive cooling methods is passive daytime radiative cooling (PDRC), a phenomenon where a surface spontaneously cools by reflecting sunlight and radiating heat to the colder atmosphere. PDRC is most effective if a surface has a high solar reflectance that minimizes solar heat gain and a high thermal emittance that maximizes radiative heat loss to the sky.

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Accelerated Exposure of Automotive Interior Trim Materials Using Outdoor Under-Glass Controlled Sun-Tracking Temperature and Humidity Apparatus

Textile and Flexible Plastics Committee
  • Ground Vehicle Standard
  • J2230_202001
  • Current
Published 2020-01-15 by SAE International in United States
This SAE standard specifies operating procedure for the exposure of automotive interior trim materials in an outdoor behind-glass apparatus in which the temperature is controlled in a 24 hour cycle. The humidity is controlled during the dark (night) portion of the cycle.
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Design Treatment for Advanced Metals Enables Easier Machining

  • Magazine Article
  • TBMG-35802
Published 2020-01-01 by Tech Briefs Media Group in United States

Exotic and advanced metals are used in aircraft, orthopedic components, medical instruments, cars, solar panels, military equipment, and other applications. They are referred to as advanced or exotic because they are more difficult to find and more costly to use in manufacturing.

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Bosch unveils electronic sun visor

Automotive Engineering: January/February 2020

Kami Buchholz
  • Magazine Article
  • 20AUTP02_12
Published 2020-01-01 by SAE International in United States

Bosch engineers have re-imagined the sun visor as a transparent liquid crystal display (LCD) panel that uses algorithms to darken only the area where sunlight hits the driver's eyes. The rest of the visor panel remains see-through for visibility.

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NASA’s BITSE Solar Scope

  • Magazine Article
  • TBMG-35765
Published 2020-01-01 by Tech Briefs Media Group in United States

NASA and the Korea Astronomy and Space Science Institute (KASI) recently tested a new way to see the Sun, high over the New Mexico desert. A balloon — large enough to hug a football field — took flight in September 2019, carrying beneath it a solar scope called BITSE. BITSE is a coronagraph, a kind of telescope that blocks the Sun’s bright face in order to reveal its dimmer atmosphere, called the corona. Short for Balloon-borne Investigation of Temperature and Speed of Electrons in the corona, BITSE seeks to explain how the Sun spits out the solar wind.

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Hyundai brings brave new tech to 2020 Sonata

Automotive Engineering: January/February 2020

Lindsay Brooke
  • Magazine Article
  • 20AUTP02_13
Published 2020-01-01 by SAE International in United States

Amid a steadily contracting sedan universe, Hyundai has dug in its heels and thoroughly redesigned and engineered its Sonata for 2020. The eighth-generation model sports a shapely (to our eyes) exterior form slightly reminiscent of Audi's A7. It's underpinned by a new platform shared with its 2021 Kia Optima cousin that will serve multiple FWD/AWD passenger cars and crossovers, according to senior U.S. product-planning manager, Mike Evanoff.

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