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In internal combustion engines, a significant share of the fuel energy is wasted via the heat losses. This study aims to understand the heat losses and analyze the potential of the waste heat recovery when biofuels are used in SI engines. A numerical model is developed for a single-cylinder, four-stroke and air-cooled SI engine to carry out the waste heat recovery analysis. To verify the numerical solution, experiments are first conducted for the gasoline engine. Biofuels including pure ethanol (E100), E15 (15% ethanol) and E85 (85% ethanol) are then studied using the validated numerical model. Furthermore, the exhaust power to heat loss ratio (
Ali Qasemian; Sina Haghparast; Pouria Azarikhah; Meisam Babaie. Effects of Compression Ratio of Bio-Fueled SI Engines on the Thermal Balance and Waste Heat Recovery Potential. Sustainability 2021, 13, 5921 .
AMA StyleAli Qasemian, Sina Haghparast, Pouria Azarikhah, Meisam Babaie. Effects of Compression Ratio of Bio-Fueled SI Engines on the Thermal Balance and Waste Heat Recovery Potential. Sustainability. 2021; 13 (11):5921.
Chicago/Turabian StyleAli Qasemian; Sina Haghparast; Pouria Azarikhah; Meisam Babaie. 2021. "Effects of Compression Ratio of Bio-Fueled SI Engines on the Thermal Balance and Waste Heat Recovery Potential." Sustainability 13, no. 11: 5921.
Considering the fact that electrification is increasingly used in internal combustion engines, this paper aims at presenting a smart speed-load sensitive cooling map for better thermal management. For this purpose, first, thermal boundary conditions for the engine cooling passage were obtained by thermodynamic and combustion simulation. Next, the temperature distribution of the cooling passage walls was determined using conjugate heat transfer method. Then, the effect of engine load on wall temperature distribution was investigated, and it was observed that in the conventional mode where the cooling flow is only affected by the engine speed, the engine is faced with over-cooling and under-cooling. Therefore, the optimum flow for cooling the engine was achieved in such a way that the engine is hot enough and kept free from damage, while the engine has a more uniform temperature distribution. These calculations were performed by considering the boiling phenomenon. The results showed using the cooling map leads to a significant reduction in coolant flow, which in turn reduces the power consumption of the water pump and size of the radiator. Moreover, fuel consumption, hydrocarbon emission production, and the needed power of the coolant pump are enhanced by 2.1, 8.6, and 44.3%, respectively.
Alireza Naderi; Ali Qasemian; Mohammad Hasan Shojaeefard; Saman Samiezadeh; Mostafa Younesi; Ali Sohani; Siamak Hoseinzadeh. A smart load-speed sensitive cooling map to have a high- performance thermal management system in an internal combustion engine. Energy 2021, 229, 120667 .
AMA StyleAlireza Naderi, Ali Qasemian, Mohammad Hasan Shojaeefard, Saman Samiezadeh, Mostafa Younesi, Ali Sohani, Siamak Hoseinzadeh. A smart load-speed sensitive cooling map to have a high- performance thermal management system in an internal combustion engine. Energy. 2021; 229 ():120667.
Chicago/Turabian StyleAlireza Naderi; Ali Qasemian; Mohammad Hasan Shojaeefard; Saman Samiezadeh; Mostafa Younesi; Ali Sohani; Siamak Hoseinzadeh. 2021. "A smart load-speed sensitive cooling map to have a high- performance thermal management system in an internal combustion engine." Energy 229, no. : 120667.
Warm‐up period is considered as the most critical phase in the operation of any device that converts the energy of a fuel into heat, electricity, and other products, including power generation units since the system efficiency and environmental pollution levels are much worse than the normal operation in that phase. Considering this point, in this study, applying the zero‐flow coolant strategy to reduce the warm‐up period is suggested for power generation units and it is investigated in details. An internal combustion engine is selected as the case‐study and implementation of the method to enhance the performance of that from both energy and environmental aspects are studied comprehensively. As the results show, for the investigated engine, which has a capacity of 1.8 L, implementation of the method leads to 17% decrease in the warm‐up period. It is accompanied by 9.32% and 2.23% improvement in the amount of unburned hydrocarbon emission and fuel consumption. Moreover, based on the conducted discussion, despite other available methods to enhance systems that consume fuel, the method is so practical that it could be employed simply in an energy system without imposing a huge cost, which is taken into account as a significant advantage.
Saman Samiezadeh; Ali Qasemian; Ali Sohani; Abolfazl Rezaei; Roozbeh Khodaverdian; Reza Soltani; Larry K. B. Li; Mohammad Hossein Doranehgard. Energy and environmental enhancement of power generation units by means of zero‐flow coolant strategy. International Journal of Energy Research 2021, 45, 10064 -10085.
AMA StyleSaman Samiezadeh, Ali Qasemian, Ali Sohani, Abolfazl Rezaei, Roozbeh Khodaverdian, Reza Soltani, Larry K. B. Li, Mohammad Hossein Doranehgard. Energy and environmental enhancement of power generation units by means of zero‐flow coolant strategy. International Journal of Energy Research. 2021; 45 (7):10064-10085.
Chicago/Turabian StyleSaman Samiezadeh; Ali Qasemian; Ali Sohani; Abolfazl Rezaei; Roozbeh Khodaverdian; Reza Soltani; Larry K. B. Li; Mohammad Hossein Doranehgard. 2021. "Energy and environmental enhancement of power generation units by means of zero‐flow coolant strategy." International Journal of Energy Research 45, no. 7: 10064-10085.
The aim of this study is to investigate the effects of Al and Cu nanostructures on the explosive boiling of a thin layer of liquid argon atoms on the Al and Cu substrates using molecular dynamics method. The results indicate that employing cone-shaped nanostructured surfaces leads to creation of thinner primary liquid layer as compared to the common Al or Cu smooth surfaces. Results show that using a cone-shaped nanostructured surface leads to a higher heat transfer rate and subsequently faster evaporating rate of the liquid layers due to increase in the solid–liquid contact area. In addition, it was found that Cu nanostructure has a more effective role in amplifying the explosive boiling, in comparison with Al nanostructure. The results further show that using the Al and Cu cone-shaped nanostructures on an Al smooth surface can increase the heat transfer by 29% and 38.7%, respectively.
Ali Qasemian; Mahmoud Qanbarian; Behrouz Arab. Molecular dynamics simulation on explosive boiling of thin liquid argon films on cone-shaped Al–Cu-based nanostructures. Journal of Thermal Analysis and Calorimetry 2020, 145, 269 -278.
AMA StyleAli Qasemian, Mahmoud Qanbarian, Behrouz Arab. Molecular dynamics simulation on explosive boiling of thin liquid argon films on cone-shaped Al–Cu-based nanostructures. Journal of Thermal Analysis and Calorimetry. 2020; 145 (2):269-278.
Chicago/Turabian StyleAli Qasemian; Mahmoud Qanbarian; Behrouz Arab. 2020. "Molecular dynamics simulation on explosive boiling of thin liquid argon films on cone-shaped Al–Cu-based nanostructures." Journal of Thermal Analysis and Calorimetry 145, no. 2: 269-278.
The aim of this study is to investigate the improvement of heat transfer efficiency of the Al and Cu substances by modifying the surfaces with conical nanostructures. The natural evaporation is simulated using the molecular dynamics method for a thin layer of Ar atoms on the solid surface. Moreover, a comparison of heat transfer behavior of the Ar atoms is presented for different substances through a comprehensive investigation. The investigated configurations include smooth Al and Cu surfaces, as well as the surfaces modified by conical Al/Cu nanostructures. Also, the distribution of Al/Cu nanostructures on surfaces is investigated. The results indicate that using Cu surface rather than the Al surface improves the heat transfer efficiency by 16.67%. In comparison with the smooth Al surface, employing conical Al and Cu nanostructures can enhance the heat transfer by 38.89% and 44.44%, respectively. Additionally, it is observed that featuring the Cu surface with Al and Cu nanostructures leads to improvement of heat transfer capability of the surface by and 39.81% and 47.59%, respectively. Furthermore, the effect of conically shaped Cu/Al nanostructures with different distribution but the same contact area to be used on the Al/Cu smooth surface on the heat transfer enhancement is studied. Based on the results, for all the structures in which Cu is considered as the base substance, the fluid temperature reaches the solid temperature faster, compared to Al as the base substance. Also, by embedding the nanostructures on Al and Cu smooth surfaces, the fluid temperature reaches the solid temperature faster in the case of Al/Cu smooth surfaces. Additionally, it is observed that employing the Cu nanostructure instead of the Al on Cu smooth surface is more effective for improving the heat transfer performance.
Mahmoud Qanbarian; Ali Qasemian; Behrouz Arab. Molecular dynamics simulation of enhanced heat transfer through conical Al/Cu nanostructures. Computational Materials Science 2020, 180, 109710 .
AMA StyleMahmoud Qanbarian, Ali Qasemian, Behrouz Arab. Molecular dynamics simulation of enhanced heat transfer through conical Al/Cu nanostructures. Computational Materials Science. 2020; 180 ():109710.
Chicago/Turabian StyleMahmoud Qanbarian; Ali Qasemian; Behrouz Arab. 2020. "Molecular dynamics simulation of enhanced heat transfer through conical Al/Cu nanostructures." Computational Materials Science 180, no. : 109710.
An appropriate heat transfer rate prediction for an internal combustion engine is important from many perspectives. This study investigates the appropriate coefficients of heat transfer correlation and provides a new method for calculating the convective heat transfer coefficient of combustion chamber walls of an HCCI engine. Therefore, a thermodynamic code including the combustion and heat transfer processes, which are coupled with an optimization algorithm, is used to estimate P-θ behavior of an HCCI engine. Double-Wiebe function and Woschni correlations are applied for combustion and heat transfer respectively in a single-zone model. The results show that the use of heat transfer correlation without improvement in coefficients and exponents for different engines, leads to significant errors in the prediction of in-cylinder pressure. Comparison of computational results with the experimental data shows that original Woschni correlation in the single-zone model cannot predict in-cylinder pressure appropriately. Modifications made in this paper resulted in a change of more than 40% in some coefficients of the existing heat transfer correlation, to provide accurate prediction of the engine thermodynamic behavior of an HCCI engine.
A Qasemian; M Rezaei. Improving combustion chamber heat transfer correlation of an HCCI engine in order to achieve a more accurate thermodynamic model. IOP Conference Series: Materials Science and Engineering 2020, 671, 012019 .
AMA StyleA Qasemian, M Rezaei. Improving combustion chamber heat transfer correlation of an HCCI engine in order to achieve a more accurate thermodynamic model. IOP Conference Series: Materials Science and Engineering. 2020; 671 (1):012019.
Chicago/Turabian StyleA Qasemian; M Rezaei. 2020. "Improving combustion chamber heat transfer correlation of an HCCI engine in order to achieve a more accurate thermodynamic model." IOP Conference Series: Materials Science and Engineering 671, no. 1: 012019.
This paper investigates the effect of some biofuels on thermal balance and performance characteristics of a single-cylinder, four-stroke SI internal combustion engine. In this study, total and instantaneous energy balance of an air-cooled, small-scale engine using various biofuels is investigated. An experimental study is carried out on gasoline engine to validate the numerical calculations. Bio-alternative fuels which include methanol, ethanol and 2-ethanol–gasoline-blended fuels consisting of E85, E15 are examined numerically. Results indicate that methanol is the most effective fuel in aspect of power generation. Ethanol, E85, E15 and gasoline are placed in next positions, respectively. Break specific fuel consumption shows totally reversed trend. It is evaluated that by increasing engine speed, heat transfer to brake power ratio decreases and lower percentage of energy in form of heat transfer is lost. The least heat transfer to brake power ratio among studied fuel is related to methanol which approves it as the most efficient biofuel. Based on instantaneous in-cylinder energy balance analysis, at the end of combustion and during expansion stroke, instantaneous brake work of fuels outpaces each other at around 40° crank angle aTDC.
Pouria Azarikhah; Sina Jenabi Haghparast; Ali Qasemian. Investigation on total and instantaneous energy balance of bio-alternative fuels on an SI internal combustion engine. Journal of Thermal Analysis and Calorimetry 2019, 137, 1681 -1692.
AMA StylePouria Azarikhah, Sina Jenabi Haghparast, Ali Qasemian. Investigation on total and instantaneous energy balance of bio-alternative fuels on an SI internal combustion engine. Journal of Thermal Analysis and Calorimetry. 2019; 137 (5):1681-1692.
Chicago/Turabian StylePouria Azarikhah; Sina Jenabi Haghparast; Ali Qasemian. 2019. "Investigation on total and instantaneous energy balance of bio-alternative fuels on an SI internal combustion engine." Journal of Thermal Analysis and Calorimetry 137, no. 5: 1681-1692.