Methodology of Thermal Balance Test for Diesel engines

Penhalbel, Luciano Tadeu Baffi; Ferreira, Edson; Araújo, Jorge Paulo Dantas de; Sobral, Mauro Roberto Souza; Moreira, Flávio Benjamin Borges

doi:10.4271/2008-36-0205

Cited by 3 publications

(3 citation statements)

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“…Determining the thermal energy losses in the exhaust system in relation to the actual conditions of operation of vehicles is a complex process [5]. Until recently only determining the dependence of energy losses on the operating parameters (engine speed, torque and power output) generated by the vehicles was possible.…”

Section: Introductionmentioning

confidence: 99%

Waste energy recovery analysis of a diesel engine exhaust system

Merkisz¹,

Fuć²,

Lijewski³

et al. 2014

WIT Transactions on Engineering Sciences

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The problem of waste energy recuperation from the exhaust gas of diesel engines has been investigated for many years by the manufacturers of passenger vehicles, heavy-duty vehicles and non-road vehicles. Currently, the energy of the exhaust gas is manly used for driving turbochargers. However, only part of the energy contained in the exhaust gas is used for this process. The outstanding energy is wasted through a heat exchange from the exhaust gas through the exhaust pipe to ambient air. Many scientific research works are aimed at the recovery of energy through transferring it from the walls to heat exchangers. The objective of the authors was the analysis of the temperature distribution in a diesel engine exhaust system in the aspect of recuperation of energy lost through heat exchange. To complete the objective, temperature and gas flow measurements were performed on the exhaust system of a 1.3 dm 3 diesel engine installed on a dynamic test stand. On the test stand a complete engine exhaust system was installed, identical to that used in a real vehicle. The tests were carried out in the NEDC homologation test that was reproduced on the dynamometer through ISAC 400 software made by AVL. For the measurements, the authors used thermoresistors and a mass flow meter for the exhaust gas mass flow measurement (part of the SEMTECH DS portable exhaust emissions analyzer).

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Section: Introductionmentioning

confidence: 99%

Waste energy recovery analysis of a diesel engine exhaust system

Merkisz¹,

Fuć²,

Lijewski³

et al. 2014

WIT Transactions on Engineering Sciences

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“…Q depends mainly on the two variables, which are the speed of engine n and the ratio of the load φ. In this study, each of them was divided into 10 intervals; the heat rejection depicted in Figure 2 is obtained from the heat balance experiment for the different pair (n, φ) [26] and is interpolated into a continuous function as defined in Equation ( 1):…”

Section: Heat Rejection Model Of Enginementioning

confidence: 99%

An Economical and Precise Cooling Model and Its Application in a Single-Cylinder Diesel Engine

2021

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The cooling system is an important subsystem of an internal combustion engine, which plays a vital role in the engine’s dynamical characteristic, the fuel economy, and emission output performance at each speed and load. This paper proposes an economical and precise model for an electric cooling system, including the modeling of engine heat rejection, water jacket temperature, and other parts of the cooling system. This model ensures that the engine operates precisely at the designated temperature and the total power consumption of the cooling system takes the minimum value at some power proportion of fan and pump. Speed maps for the cooling fan and pump at different speeds and loads of engine are predicted, which can be stored in the electronic control unit (ECU). This model was validated on a single-cylinder diesel engine, called the DK32. Furthermore, it was used to tune the temperature of the water jacket precisely. The results show that in the common use case, the electric cooling system can save the power of 255 W in contrast with the mechanical cooling system, which is about 1.9% of the engine’s power output. In addition, the validation results of the DK32 engine meet the non-road mobile machinery China-IV emission standards.

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“…These include the measurement of: fuel consumption, intake air temperature, exhaust gas temperature and mass flow, inlet and outlet coolant temperature, the coolant flow, engine speed, engine load etc. A detailed description of this method can be found in [6,7]. Yet, on traditional engine test beds it is impossible to reproduce dynamic states of engine operation that simulate actual vehicle driving cycles including not only the speed profile but also the vehicle parameters and driver behavior.…”

Section: Energy Balance Of a Combustion Engine Determined Under Actuamentioning

confidence: 99%

The assessment of exhaust system energy losses based on the measurements performed under actual traffic conditions

Fuć¹,

Merkisz²,

Lijewski³

et al. 2014

WIT Transactions on Ecology and the Environment

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It is generally acknowledged that energy losses from the exhaust system are approximately 30% of the total losses of energy supplied to the engine in the form of fuel. Part of this energy is used to heat the aftertreatment systems whose pollutant conversion rate is tightly related to their operating temperature. The exhaust gas flowing through the catalytic supports of the converters and filters warms them up while the outstanding energy contained in the gases is lost permanently. Hence, it is vital to recuperate the waste energy and convert it into different forms such as electrical energy using thermoelectric modules. In this paper, we determined the energy loss in an exhaust system of a city bus following the measurements carried out under actual traffic conditions on a regular bus route. The measurements of the exhaust gas temperature and mass flow were performed at three points. For this, thermoresistors and a portable exhaust emission analyzer SEMTECH DS (designed for exhaust emission testing under actual traffic conditions) were used. Based on the measured exhaust emission of CO 2 , CO and THC we determined the vehicle gas mileage. From the vehicle diagnostic system, we pulled basic data of the engine operation and based on this, the amount of energy supplied to the engine and the losses through the exhaust system throughout the entire test run of the bus were determined.

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Methodology of Thermal Balance Test for Diesel engines

Cited by 3 publications

References 0 publications

Waste energy recovery analysis of a diesel engine exhaust system

Waste energy recovery analysis of a diesel engine exhaust system

An Economical and Precise Cooling Model and Its Application in a Single-Cylinder Diesel Engine

The assessment of exhaust system energy losses based on the measurements performed under actual traffic conditions

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