Thermal management in conventional diesel engines

Praveen, S.M.; Saravanan, B.; Siddharthan, B.; Kumaragurubaran, S.B.

doi:10.1016/j.matpr.2020.03.531

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…Various researchers focused on the effect of thermostat performance with paraffin actuators on engine cooling systems where the circuit design and thermostat design are investigated [17][18][19][20]. The paraffin actuator for car thermostats are working particularly between 30 and 120 C. The working temperature range of e-vehicle battery cooling circuits is at around 30 C [6], the conventional internal combustion engine cooling circuits is at around 80 C [21] and also heated thermostat cooling circuits is around 120 C [22].…”

Section: Introductionmentioning

confidence: 99%

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Paraffin/polyacrylonitrile hybrid nanofibers for thermal hysteresis enhancement of paraffin actuators

Kutlu

Eren

Aykut

2021

Journal of Industrial Textiles

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Fast and facile one-step preparation of paraffin/polyacrylonitrile hybrid nanofibers via single needle (uniaxial) electrospinning system was studied. As-spun paraffin/polyacrylonitrile nanofibers were used for thermal hysteresis enhancement of paraffin actuators. Solid paraffin with the melting point of 32, 58, 89 and 114°C were employed for the preparation of the paraffin/polyacrylonitrile nanofibers. Differential scanning calorimetry measurements revealed that the melting point of the paraffin in paraffin/polyacrylonitrile hybrid nanofiber was clearly detectable and the melting entalpy coming from the paraffin part gradually increased from 9.6 to 101.5 J/g with the increase in the melting points of the added same amount of paraffins in paraffin/polyacrylonitrile nanofibers. When both calorimetric and weight loss measurements were considered, the paraffin which has the melting point of 32°C was found to be suitable to produce hybrid nanofibers paraffin actuator. Therefore, this hybrid nanofiber was selected for the application in paraffin actuators for e-vehicle battery cooling systems where the battery temperature must be kept between 15 and 35°C. Paraffin compound of the paraffin actuators was prepared with a mixture of pure paraffin and paraffin/polyacrylonitrile nanofiber with the wt.% of 2.5, 5, 7.5 and 10. In the hysteresis measurements, the hysteresis value at 3 mm stroke was successfully enhanced as 1.7, 3.4, 11.9 and 15.3% sequentially for the samples produced with the above ratios. Beyond hysteresis enhancement, the phenomena of thermal percolation threshold effect and thermal conductivity contrast ratio effect in nano scale were emprically exposed on opening and closing behavior of the paraffin actuator.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Paraffin/polyacrylonitrile hybrid nanofibers for thermal hysteresis enhancement of paraffin actuators

Kutlu

Eren

Aykut

2021

Journal of Industrial Textiles

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“…An extensive literature deals with engine thermal management as a promising option for obtaining reduced emissions and lower fuel consumption via a faster thermal stabilization of the engine [10,11]. Wide margins for enhanced engine performance are associated with a shorter warm up time of the lubricant oil [12,13,14]: a higher temperature of the lubricant is associated with lower viscosity and higher mechanical and organic efficiencies due to lower friction mean effective pressure (FMEP), particularly during engine cold states, when both the power unit and the aftertreatment line provide poor performance [15,16].…”

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confidence: 99%

Model Parameterized Assessment of a Thermal Storage Unit for Engine Oil Warm-up Improvement

Vittorini

Diomede

Battista

et al. 2022

J. Phys.: Conf. Ser.

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Despite the attention paid to components downsizing and down weighting, as well as to combustion control and exhaust gases after-treatment, friction reduction remains a promising area of intervention when it comes to the reduction of the environmental impact of internal combustion engines. The larger gain must be sought at cold starts, when the viscosity of the lubricant oil is higher and does not allow proper friction reduction. Moreover, during the first phases of engine operation, the metallic masses are not yet warm and do not contribute to the thermal stabilization of the lubricant. Further consequences of unfavourable thermal conditions are increased specific fuel consumption and pollutant emissions. Proper thermal management could effectively speed up the reaching of the design operating temperature of the oil and positively affect both homologation and on-road operation. The abundance of waste thermal energy during normal operation supports the option of on-board thermal storage for faster oil heating: water, heated by exhaust gases or residual thermal energy from previous use or by a combination of the two, can be stored inside a thermally insulated tank and serve as heating fluid in a dedicated water/oil heat exchanger. The paper presents a model based evaluation of this opportunity. The model has been validated thanks to an experimental activity carried out on an IVECO 3.0 L light-duty diesel engine, during a transient cycle (i.e., homologation one) reproduced on a dynamometric test bench. Different configurations in terms of hot storage volume, hot storage initial temperature, and the flow rate of the hot water during operation have been studied, producing optimized values for the hot water and storage unit design.

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The Effects of the Oil Temperature Warm-Up on Engine Fuel Consumption

Di Giovine,

Di Battista,

Cipollone

2024

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">The need for even more efficient internal combustion engines in the road transportation sector is a mandatory step to reduce the related CO<sub>2</sub> emissions. In fact, this sector impacts significantly on greenhouse gases worldwide, and the path toward hybrid and electric powertrains has just begun. In particular, in heavy-duty vehicles the full electrification of the powertrain is far to be considered as a really feasible alternative. So, internal combustion engines will still play a significant role in the near/medium future. Hence, technologies having a low cost to benefits (CO<sub>2</sub> reduction) ratio will be favorably introduced in existing engines. Thermal management of engines is today a recognized area of research. Inside this area, the interest toward the lubricant oil has a great potential but not yet fully exploited. Engine oil is responsible of the mechanical efficiency of the engine which has a significant potential of improvement. A faster warm-up during a daily urban trip when the engine starts from a cold state is a good way to reduce fuel consumption (CO<sub>2</sub> emissions) and also harmful emissions, which represent the most critical aspect in urban areas. Conventional oil warm-up takes several minutes to reach a thermal regime, during which inefficiencies related to the low oil temperature are significant.</div><div class="htmlview paragraph">In this paper, the relation between oil temperature and fuel consumption of a turbocharged diesel engine has been evaluated, matching a theoretical approach with experimental data. The oil warm-up has been registered during a homologation cycle when the engine was managed as light-duty propulsion system. Most part of the working conditions was done with the oil far from a thermal regime, demonstrating poor efficiency and high harmful emissions. Then, several strategies to speed up the oil warm-up have been investigated, characterizing the benefits in terms of CO<sub>2</sub> emissions. Particularly, the use of a thermal storage available on board resulted effective, as well as an eventual heat recovery from exhaust gases which immediately reach a temperature level enough to heat up the oil.</div></div>

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Thermal management in conventional diesel engines

Cited by 3 publications

References 8 publications

Paraffin/polyacrylonitrile hybrid nanofibers for thermal hysteresis enhancement of paraffin actuators

Paraffin/polyacrylonitrile hybrid nanofibers for thermal hysteresis enhancement of paraffin actuators

Model Parameterized Assessment of a Thermal Storage Unit for Engine Oil Warm-up Improvement

The Effects of the Oil Temperature Warm-Up on Engine Fuel Consumption

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