Energy
R. Aghagolzadeh Silakhor; O. Jahanian; B. Alizadeh Kharkeshi
Abstract
Using cogeneration systems is a great way to tackle fossil fuel consumption problems. This paper introduces a Combined Cooling Heating Power (CCHP) system to recover the waste heat of an RK215 heavy diesel engine as a prime mover. Therefore the CCHP system consists of Internal Combustion Engine (RK215), ...
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Using cogeneration systems is a great way to tackle fossil fuel consumption problems. This paper introduces a Combined Cooling Heating Power (CCHP) system to recover the waste heat of an RK215 heavy diesel engine as a prime mover. Therefore the CCHP system consists of Internal Combustion Engine (RK215), a heat storage tank, and an absorption chiller. Also, the system has been studied in four modes: CCHP, CHP, CCP, and single generation. The waste heat ratio has changed due to a y factor, and the effect of this different parameter, such as the start of fuel injection and exhaust gas heat, on the system's efficiency by considering first and second laws of thermodynamic in different operating modes has been investigated. The system's highest energy and exergy efficiency in CCHP mode is equal to 50.46 and 30.8%, respectively. According to the result, as the CCHPs cooling load to the absorption chiller increases, the performance also rises. Also, the system’s carbon dioxide emissions reduction has been studied. The results showed that using different modes for waste heat recovery can reduce carbon dioxide by up to 30% approximately for different modes. Also, the fuel energy saving ratio (FESR) has been investigated, and the results showed that systems in CCHP, CHP, and CCP modes could have FESR approximately equal to 21%.
S. Talesh Amiri; R. Shafaghat; O. Jahanian; A. H. Fakhari
Abstract
To better homogenize the mixture of fuel and air in the combustion chamber and to enhance the controllability of ignition timing in Reactivity Controlled Compression Ignition (RCCI) engines, controlling the start of injection (SOI) timing can be essential. By changing the SOI timing, at some specific ...
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To better homogenize the mixture of fuel and air in the combustion chamber and to enhance the controllability of ignition timing in Reactivity Controlled Compression Ignition (RCCI) engines, controlling the start of injection (SOI) timing can be essential. By changing the SOI timing, at some specific crank angles (CAs), the fuel can impact the edge of the piston bowl and create some difficulties. In this research, initially, efforts are made to recognize the range of SOI timing in which this collision process takes place (in the range of 44-54° bTDC), then, performance and the emission levels of the engine were evaluated in the beginning and end of this interval. The findings suggest that the nitrogen oxides emissions and the maximum in-cylinder mean pressure are higher in SOI of 44° bTDC, as compared to those in the SOI timing of 54°bTDC, although the latter has higher ignition delay and unburnt hydrocarbon (UHC) emission. Moreover, some evaluations were carried out to examine how the temperature of the fuel-air mixture can affect the performance of the engine in this specific range. It was found that as the IVC temperature increases, it rises the indicated mean effective pressure (IMEP), in-cylinder pressure, and NOx emission.
M. M. Namar; A. R. Mogharrebi; O. Jahanian
Abstract
Nowadays, two main deals of researchers in different fields of industries are emissions and fuel consumption. The political turmoil of crude oil besides stricter environmental laws in the world tends researchers to find novel ways for fuel consumption and emissions reduction. Using Ethanol-Gasoline blend ...
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Nowadays, two main deals of researchers in different fields of industries are emissions and fuel consumption. The political turmoil of crude oil besides stricter environmental laws in the world tends researchers to find novel ways for fuel consumption and emissions reduction. Using Ethanol-Gasoline blend as fuel in spark ignition engines is considered as a promising idea to achieve this goal for internal combustion engines industries. Providing a model to investigate the performance of Ethanol-Gasoline fueled engine in different operating conditions is still needed to reduce experimental test costs. In this study, a thermodynamic model of ethanol-gasoline fueled spark ignition engine is provided and the effects of operating conditions on engine performance are investigated in detail after validating simulation results via experimental data. Results show the provided model generates reliable data of engine performance in the full range of fuel composition, from pure ethanol to pure gasoline. In addition, studied engine produces maximum power besides best fuel consumption when it is run at 3000 rates per minute. Also, the best performance is achieved with E-45 composition while NOx emission raise 60 percent in comparison to pure gasoline. So, it can be introduced as design point for studied engine.
