Vehicle Testing and Development Involving a Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse

Osman, Azmi; Yusof, M. Khairul Arif Muhammad; Rafi, Mohammad

doi:10.4271/2016-01-0647

Cited by 8 publications

(21 citation statements)

References 13 publications

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“…Figure 3 shows the proposed cooling circuit with the EHRU located in between the cylinder block outlet and T-junction #2. The cooling circuit shares similarities with the cooling circuits used in the earlier studies 11,12 except that the coolant passage in between the two T-junctions is not connected to any heat exchanger. Like the earlier studies, the coolant flows from T-junction #1 to #2 when the thermostat is fully close or partially open.…”

Section: Cooling Circuit and Ehrumentioning

confidence: 99%

“…In improving the warm-up performances, it is necessary for the thermal inertia to be reduced 19,20 or alternatively, to increase the heat transfer from the source to overcome the high thermal inertia. 21 Osman et al 11,12 have also published relevant papers in this area. Understanding that a typical turbocharger has coolant inlet and outlet for cooling, they proposed the use of the conventional turbocharger as an EHRU.…”

Section: Introductionmentioning

confidence: 99%

“…From the above-mentioned papers, the coolant flowing through the cylinder head became hot rapidly and it stayed hot in most of the engine operations except when the engine speed was high or when the thermostat was wide open. 11,12 Significant amount of precious heat from the cylinder head coolant was lost to the relatively cooler EHRU in the early part of cold start. As the EHRU became hotter than the coolant from the cylinder head, the resulting temperature difference was smaller than what it would be with cooler coolant feed.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on recoverable thermal energy from low thermal inertia exhaust heat recovery unit

Osman

Zulkifli

Said

et al. 2021

Advances in Mechanical Engineering

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Modern engines in general waste plenty of heat to the exhaust gas and coolant. Considering that daily driving consists of frequent cold start, idling, and part load driving within short driving distances, the potentials to recover heat from high enthalpy exhaust gas are limited. In recovering heat from low enthalpy exhaust gas, a low thermal inertia exhaust heat recovery unit (EHRU) with no heat transfer fins is proposed to be integrated to the simplified split cooling circuit used in the earlier studies. This lightweight, compact and simple EHRU concept made of machined steel plate is targeted for naturally aspirated engines that are still being widely used worldwide. Cooler coolant feed from the bottom of the cylinder block’s water jacket rear end provided large temperature difference between the coolant and exhaust gas. In evaluating its effectiveness in speeding up the recovered heat availability for reuse, a 1.3 l passenger car equipped with strategically placed multiple thermocouples and flow meters was tested using NEDC test. From the experiments and classical analysis, the recovered thermal energy was available in just 25 s after cold start. The study also provided a new direction on the design of EHRU and its integration into an engine.

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Section: Cooling Circuit and Ehrumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study on recoverable thermal energy from low thermal inertia exhaust heat recovery unit

Osman

Zulkifli

Said

et al. 2021

Advances in Mechanical Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…This leads to less HC and CO emissions [11], lower friction, reduced heat loss [12] and faster catalyst light-off [13]. Means of hasting warm-up are: coolant path optimization [14], exhaust heat recovery [15], immersion heaters, thermal mass reduction, thermal energy storage and improvement of heat transfer between oil and coolant [16].…”

Section: Introductionmentioning

confidence: 99%

Development and Validation of a Submodel for Thermal Exchanges in the Hydraulic Circuits of a Global Engine Model

Broatch

Olmeda

Martín

et al. 2018

SAE Technical Paper Series

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To face the current challenges of the automotive industry, there is a need for computational models capable to simulate the engine behavior under low-temperature and low-pressure conditions. Internal combustion engines are complex and have interconnected systems where many processes take place and influence each other. Thus, a global approach to engine simulation is suitable to study the entire engine performance. The circuits that distribute the hydraulic fluids-liquid fuels, coolants and lubricants-are critical subsystems of the engine. This work presents a 0D model which was developed and set up to make possible the simulation of hydraulic circuits in a global engine model. The model is capable of simulating flow and pressure distributions as well as heat transfer processes in a circuit. After its development, the thermo-hydraulic model was implemented in a physical based engine model called Virtual Engine Model (VEMOD), which takes into account all the relevant relations among subsystems. In the present paper, the thermo-hydraulic model is described and then it is used to simulate oil and coolant circuits of a diesel engine. The objective of the work is to validate the model under steady-state and transient operation, with focus on the thermal evolution of oil and coolant. For validation under steady-state conditions, 22 operating points were measured and simulated, some of them in cold environment. In general, good agreement was obtained between simulation and experiments. Next, the WLTP driving cycle was simulated starting from warmed-up conditions and from ambient temperature. Results were compared with the experiment, showing that modeled trends were close to those experimentally measured. Thermal evolutions of oil and coolant were predicted with mean errors between 0.7ºC and 2.1ºC. In particular, the warm-up phase was satisfactorily modeled.

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“…This increases the importance of the reduction of the engine warm up phase [10,11], and, furthermore, it rebounds on interventions on the cooling and lubricating circuits [12,13], as well as in the combustion progression. Under misfiring conditions, in fact, combustion cannot supply sufficient power to drive the engine and to overcome the increased friction losses.…”

Section: Introductionmentioning

confidence: 99%

Improving Engine Oil Warm Up through Waste Heat Recovery

Battista

Cipollone

2017

Energies

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Abstract:In the transportation sector, engine oil thermal management has not yet received the attention it deserves in the path towards carbon dioxide and pollutants reduction. During the homologation cycle (which represents a typical daily trip), oil temperature reaches its thermal steady value, which insures best performances in terms of viscosity, only in the final part of the trip, when most part of the harmful emissions have been already emitted; therefore, a warm up acceleration would surely represent a strong beneficial action. In this paper, a faster warming up of the lubricant oil was done using the heat owned by the exhaust gases, which was almost immediately ready after the engine ignition, in the early part of a driving cycle. An experimental activity has been developed in a turbocharged engine (F1C 3L IVECO), modifying the oil circuit in order to heat up the oil during the cold phase of a homologation cycle by the exhaust gases. A significant reduction of fuel consumption and pollutant emissions savings has been experimentally demonstrated. Also, the interaction between the modified oil circuit, engine, coolant circuit, and exhaust line has been investigated in order to have a system view of the new heating oil technology.

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Vehicle Testing and Development Involving a Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse

Cited by 8 publications

References 13 publications

Experimental study on recoverable thermal energy from low thermal inertia exhaust heat recovery unit

Experimental study on recoverable thermal energy from low thermal inertia exhaust heat recovery unit

Development and Validation of a Submodel for Thermal Exchanges in the Hydraulic Circuits of a Global Engine Model

Improving Engine Oil Warm Up through Waste Heat Recovery

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