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Replacing twin electric fan radiator with Single fan radiator

Engine Design & Testing-Tushar Warkhade
Tata Technologies, Ltd.-Aashish Bhargava, Gaurav Soni
  • Technical Paper
  • 2019-28-2381
Published 2019-11-21 by SAE International in United States
Downsizing is one of the crucial activities being performed by every automotive engineering organization. The main aim is to reduce – Weight, CO2 emissions and achieve cost benefit. All this is done without any compromise on performance requirement or rather with optimization of system performance. This paper evaluate one such optimization, where-in radiator assembly with two electric fan is targeted for downsizing for small commercial vehicle application. The present two fan radiator is redesigned with thinner core and use of single fan motor assembly. The performance of the heat exchanger is tested for similar conditions back to back on vehicle and optimized to get the balanced benefit in terms of weight, cooling performance and importantly cost. This all is done without any modification in vehicle interface components except electrical connector for fan. The side members and brackets design is also simplified to achieve maximum weight reduction. Further Cooling system performance of engine is evaluated along with Fuel efficiency; results are compared with present configuration.
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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…
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One-Dimensional Modeling of a Thermochemical Recuperation Scheme for Improving Spark-Ignition Range Extender Engine Efficiency

Univ of Minnesota-Twin Cities-William F. Northrop, Darrick Zarling
  • Technical Paper
  • 2019-24-0066
Published 2019-09-09 by SAE International in United States
Range extender (REx) engines have promise for providing low-cost energy for future battery electric vehicles. Due to their restricted operation range, REx engines provide an opportunity to implement system-level schemes that are less attractive for engines designed for highly transient operation. This paper explores a thermochemical recuperation (TCR) scheme for a 2-cylinder BMW spark-ignition REx engine using a 1-D model implemented in GT-Power™. The TCR reactor employs a unique catalytic heat exchange configuration that enables efficient transfer of exhaust sensible and chemical enthalpy to steam reform the incoming fuel. The engine model without the TCR reactor was validated using experimental emissions and performance data from a BMW engine operating on a test stand. A custom integrated heat exchanger and catalyst model was created and integrated with the validated engine. A parametric modeling sweep was conducted with iso-octane as fuel over a range of reformed fuel fraction. With the TCR reactor operating at a molar steam to carbon ratio of 1.0, engine efficiency was increased by 2.9% over the baseline REx engine within the most efficient…
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A New Take on Porous Medium Approach for Modelling Monoliths and Other Multiple Channel Devices

Coventry University-Gianluca Padula, Jonathan Saul, Svetlana Aleksandrova, Humberto Medina, Stephen Benjamin
  • Technical Paper
  • 2019-24-0049
Published 2019-09-09 by SAE International in United States
The porous medium approach is widely used to represent high-resistance devices, such as catalysts, filters or heat exchangers. Because of its computational efficiency, it is invaluable when flow losses need to be predicted on a system level. One drawback of using the porous medium approach is the loss of detailed information downstream of the device. Correct evaluation of the turbulence downstream affects the calculation of the related properties, e.g. heat and mass transfer.The novel approach proposed in the current study is based on a modified distribution of the resistance across the porous medium, which allows to account for the single jets developing in the small channels, showing an improved prediction of the turbulence at the exit of the device, while keeping the low computational demand of the porous medium approach.The benefits and limitations of the current approach are discussed and presented by comparing the results with different numerical approaches and experiments. The flexibility of the proposed approach in terms of describing the device geometry is demonstrated via an optimisation study where the size of the…
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CFD Modeling of Compact Heat Exchangers for I.C. Engine Oil Cooling

Politecnico di Milano-Augusto Della Torre, Gianluca Montenegro, Angelo Onorati
UFI Filters-Roberto Icarelli
Published 2019-09-09 by SAE International in United States
This work describes the development of a computational model for the CFD simulation of compact heat exchangers applied for the oil cooling in internal combustion engines. Among the different cooler types, the present modeling effort will be focused on liquid-cooled solutions based on offset strip fins turbulators. The design of this type of coolers represents an issue of extreme concern, which requires a compromise between different objectives: high compactness, low pressure drop, high heat-transfer efficiency. In this work, a computational framework for the CFD simulation of compact oil-to-liquid heat exchangers, including offset-strip fins as heat transfer enhancer, has been developed. The main problem is represented by the need of considering different scales in the simulation, ranging from the characteristic size of the turbulator geometry (tipically μm - mm) to the full scale of the overall device (typically cm - dm). Therefore, the developed modeling approach is based on a multi-scale concept, which applies: a) detailed simulations, performed on a refined grid on a representative elementary volume (REV), to characterize the fluid-dynamic and heat-transfer properties of…
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Charge Air Cooler Internal Cleanliness, Leakage, and Nomenclature

Cooling Systems Standards Committee
  • Ground Vehicle Standard
  • J1726_201909
  • Current
Published 2019-09-05 by SAE International in United States
This SAE Recommended Practice provides test methods and criteria for evaluating the internal cleanliness and air leakage for engine charge air coolers. This SAE Recommended Practice also provides nomenclature and terminology in common use for engine charge air coolers, related charge air cooling system components, and charge air cooling system operational performance parameters.
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Water Spray and High Humidity Endurance Test Methods for AMS1424 and AMS1428 Aircraft Deicing/Anti-Icing Fluids

G-12ADF Aircraft Deicing Fluids
  • Aerospace Standard
  • AS5901D
  • Current
Published 2019-09-04 by SAE International in United States
This document establishes the minimum requirements for an environmental test chamber, and test procedures to carry out anti-icing performance tests according to the current materials specification for aircraft deicing/anti-icing fluids. The primary purpose for such a test method is to determine the anti-icing endurance under controlled laboratory conditions of AMS1424 Type I and AMS1428 Type II, III, and IV fluids.
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Combustion Gas Heat Exchanger

  • Magazine Article
  • TBMG-34897
Published 2019-08-01 by Tech Briefs Media Group in United States

Two very challenging problems facing the U.S. and the world are energy security and global climate change, largely due to dependence on fossil fuels. Cost-effective technologies have been developed that are capable of substantial energy savings through improved energy efficiency.

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Recommended Practice for an Engineering Analysis for A/C Efficiency Credits

Interior Climate Control Vehicle OEM Committee
  • Ground Vehicle Standard
  • J3174_201907
  • Current
Published 2019-07-18 by SAE International in United States
Under U.S. GHG and CAFE regulations, manufacturers are required to perform confirmatory testing to validate indirect air conditioning credits (refer to 40 CFR 86.1868-12). The purpose of this Reccomended Practice is to provide manufacturers with updated criteria for the 2020 and later model years. This Recommended Practice discribes the work done by the IMAC GHG CRP to develop test procedures, publish SAE Standards, and determine performance requirements to demonstrate the performance of A/C technologies from the pre-approved credit menu meeting regulatory requirements. Also, enclosed in this Recommended Practice are instructions that can be used by vehicle manufacturers in establishing an engineering analysis in lieu of performing the AC17 test on a vehicle which does not incorporate the credit-generating technologies. These procedures for performing an engineering analysis should be sufficient to satisfy the requirements of the regulation to earn credits for indirect A/C technologies from the pre-approved credit menu.
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A/C Compressor Oil Separator Effectiveness Test Standard

Interior Climate Control MAC Supplier Committee
  • Ground Vehicle Standard
  • J3112_201907
  • Current
Published 2019-07-15 by SAE International in United States
This SAE Standard establishes the test conditions and reporting method for quantifying refrigerant circuit oil circulation rate (OCR) reduction effectiveness of mobile air conditioning compressors using R-134a and R-1234yf refrigerants that include oil separators and/or other design features for the purpose of reducing the OCR in the refrigerant circuit. This standard and the OCR values it produces are not intended to make judgement on suitability of OCR values with regard to compressor durability.
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