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Methodology to quantify the undesirable effects of the localized inefficiency of heat pick-up in suction line on an automotive air-conditioning system

Y.S.Sarath Reddy
Tata Motors Ltd-Suresh Tadigadapa, Santosh Ghorpade, Ankit Shukla
  • Technical Paper
  • 2020-28-0036
To be published on 2020-04-30 by SAE International in United States
The automotive application places very special demands on the air conditioning system. As is the case with any other process, system efficiency is very important and the automotive air-conditioning application is no exception. While the characteristics of all the major components in the air conditioning system like compressor, condenser, evaporator and blower contribute to overall system efficiency, localized inefficiencies do play a part and so must be kept to a minimum, especially in this day and age when extra emphasis is being paid on sustainability. One such phenomenon that contributes to the system inefficiency is heat pick-up in suction line. Since the temperature at the evaporator-outlet is quite lower than ambient and also its surroundings (steering system pipes and hoses, engine, air intake pipes and so on), the refrigerant picks up heat as it moves along the suction line up to the compressor inlet. This heat pick-up is detrimental to the overall system performance. Even though most of the automotive HVAC engineers are fairly aware of the undesirable effects of heat pick-up in suction line,…
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Development of Cooling Fan Model and Heat Exchange Model of Condenser to Predict the Cooling and the Heat Resistance Performance of Vehicle

Honda R&D Co., Ltd.-Yuichi Fukuchi, Kunihiko Yoshitake, Kazutaka Yokota
  • Technical Paper
  • 2020-01-0157
To be published on 2020-04-14 by SAE International in United States
The cooling performance and the heat resistance performance of commercial vehicle are balanced with aerodynamic performance, output power of power train, styling, the location of sensors, cost and many other parameters. Therefore, it is desired to predict the cooling performance and the heat resistance performance with high accuracy at the early stage of development. Three forms of heat transfer consist of conduction, convection and radiation. Among of these components, it is sometimes difficult to solve the thermal conduction accurately, because to prepare accurate shape and properties needs lots of time and efforts at the early stage of development. Therefore, the cooling performance of heat exchangers and the air temperature distribution in the engine compartment are predicted to access the cooling and the heat resistance performance of vehicle at the preliminary design stage. The air temperature distribution is dominated by the distribution of heat radiation on heat exchangers, the flow distribution which is produced by fans and thermal convection at the surface of parts in the engine compartment. For the case of middle or high vehicle…
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Development of Intercooler Hose for Future Engine

Hino Motors, Ltd.-Ryoji Kodama, Takahiro Onishi
  • Technical Paper
  • 2020-01-0236
To be published on 2020-04-14 by SAE International in United States
Current intercooler hoses, which are made from fluorocarbon rubber (FKM) and silicone rubber (VMQ) exhibit high heat resistance and durability. However, they will be used in more severe use environments, and there is a risk of problems arising with their current material composition. This investigation into issues concerning intercooler hoses in future engines found that FKM mechanical properties were insufficient under high temperature environments. In this research, efforts to improve the mechanical properties of FKM focused on the low durability of the internal FKM crosslinking points as the cause of this insufficiency. The current crosslinking method has excellent acid resistance and cannot be modified. An effective improvement the properties was therefore sought by adding a new distinct crosslinking network while preserving the current level of acid resistance of the existing network. Carbon black gel was used as a reinforcing agent to form the new network. Polymer types and blending were adjusted to achieve the target values and develop a new FKM, which was used to make a prototype hose and confirmed to be free of…
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Conductive Polymer/Carbon Nanotube Structural Materials

  • Magazine Article
  • TBMG-36172
Published 2020-03-01 by Tech Briefs Media Group in United States

Carbon nanotubes (CNTs) show promise for multifunctional materials for a range of applications due to their outstanding combination of mechanical, electrical, and thermal properties. These promising mechanical properties, however, have not translated well to CNT nanocomposites fabricated by conventional methods due to the weak load transfer between tubes or tube bundles.

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Spring Drive Fitting

  • Magazine Article
  • TBMG-36183
Published 2020-03-01 by Tech Briefs Media Group in United States

Valve and tube manufacturers continue to battle the problem of fitting pipes and tubing together quickly and reliably. The spring drive fitting addresses this challenge, bridging the gap between solutions for small-diameter tube fittings commonly seen in high-pressure, low-flow-area pneumatic systems and solutions for large flanges used in low-pressure, high-flow-area hydraulic systems.

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Aircraft Oxygen Replenishment Coupling for Civil Transport Aircraft (Design Standard)

A-10 Aircraft Oxygen Equipment Committee
  • Aerospace Standard
  • AS1219A
  • Current
Published 2020-02-28 by SAE International in United States
This SAE Aerospace Design Standard defines a coupling, which is installed in a high pressure (1850 to 2000 psig) oxygen system of a civil transport aircraft for the purpose of mating to ground oxygen replenishment facilities. Dimensions developed from AND10089, Detail Specification Sheet for Fitting End, Design Standard, For Cone Connection.
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Barometry for Altimeter Calibration

A-4 Aircraft Instruments Committee
  • Aerospace Standard
  • AIR1075B
  • Current
Published 2020-02-20 by SAE International in United States
This SAE Aerospace Information Report (AIR) is concerned only with aspects directly relating to available accuracy. While well-designed photoelectric, inductive or capacitive readers and pressure regulators, and other accessories are highly desirable for convenience and production rate, they are considered to be outside the scope of this AIR.
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Titanium Alloy, Hydraulic, Seamless Tubing 3.0Al - 2.5V Annealed

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4943L
  • Current
Published 2020-02-18 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Titanium Alloy Tubing, Seamless, Hydraulic 3Al - 2.5V, Texture Controlled Cold Worked, Stress Relieved

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4946F
  • Current
Published 2020-02-13 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Titanium Alloy Tubing, Seamless, Hydraulic 3Al - 2.5V, Controlled Contractile Strain Ratio Cold Worked, Stress Relieved

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4945H
  • Current
Published 2020-02-13 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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