Dual level vehicle heat rejection system

Malvicino, C.; Sciullo, Fausto Di; Cuniberti, M.; Vestrelli, Francesco; Beltramelli, Fabrizio

doi:10.1533/9780857095053.7.473

Cited by 6 publications

(2 citation statements)

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“…Two roll bond HEXs installed on the engine hood and below the engine could dissipate 60% of heat from the engine in all the test conditions. In reference [2] two levels of cooling systems (high-temperature and low-temperature systems) were introduced to a car. The condenser and the intercooler were cooled by liquid instead of air.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Aluminum and Graphite Foam Heat Exchangers Under Countercurrent Arrangement

Lin¹,

Yuan²,

Sundén³

2013

Heat Transfer Engineering

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Due to the increasing power requirement and the limited available space in the vehicles, a countercurrent heat exchanger (HEX) is proposed for the position on the roof of the vehicle compartment. Furthermore, a new material, graphite foam with high thermal conductivity and low density, is a potential material for HEXs in vehicles. In order to evaluate the performance of the graphite foam HEX, the CFD computational fluid dynamics (CFD) approach is applied in a comparative study between the graphite foam and the aluminum HEXs under countercurrent flow condition. The analysis is conducted for the thermal performance (heat transfer coefficient) and the pressure loss. The simulation results show that the graphite foam HEX proves higher thermal performance than the aluminum HEX. However, due to the high pressure loss in the graphite foam HEX, the coefficient of performance in the graphite foam HEX is much lower than that of the aluminum HEX. A specific case study is carried out to evaluate the performance of graphite foam HEX as well. Useful recommendations are highlighted and provided to promote the development of the countercurrent flow HEXs in vehicles.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of Aluminum and Graphite Foam Heat Exchangers Under Countercurrent Arrangement

Lin¹,

Yuan²,

Sundén³

2013

Heat Transfer Engineering

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“…In addition, two levels of cooling systems (high temperature and low temperature systems) were introduced to a car in Ref. [6]. The condenser and the intercooler were cooled by liquid instead of air.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Countercurrent Flow Heat Exchanger Placed on the Truck Compartment Roof

Lin

Yuan

Sundén

2012

Journal of Thermal Science and Engineering Applications

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Due to the increasing power requirement and the limited available space in vehicles, placing the heat exchanger at the roof or the underbody of vehicles might increase the possibility to handle the cooling requirement. A new configuration of the heat exchanger has to be developed to accommodate with the position change. In this paper, a countercurrent heat exchanger is developed for position on the roof of the vehicle compartment. In order to find an appropriate configuration of fins with high thermal performance on the air side, the computational fluid dynamics approach is applied for a comparative study among louver fin, wavy fin, and pin fin by using ANSYS FLUENT software. It is found that the louver fin performs high thermal performance and low pressure drop. Thus, the louver fin is chosen to be the configuration of the countercurrent flow heat exchanger. It is also found that the countercurrent flow heat exchanger presents higher heat transfer coefficient than the cross flow heat exchanger. Furthermore, the overall size and the air pumping power of the countercurrent flow heat exchanger are lower than those in the cross flow heat exchanger. Several suggestions and recommendations are highlighted.

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