Waste heat recovery from the exhaust of a diesel generator using Rankine Cycle

Hossain, S.N.; Bari, Saiful

doi:10.1016/j.enconman.2013.06.009

Cited by 79 publications

(24 citation statements)

References 40 publications

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“…Some researchers to estimate the energy availability of the HEX in exhaust carried the exergy analysis out [10,14]. By considering some assumptions for simplification of the combustion product as ideal gas, the specific exergy of the exhaust is calculated by using the following equation [14], …”

Section: Exergy Analysismentioning

confidence: 99%

“…By considering some assumptions for simplification of the combustion product as ideal gas, the specific exergy of the exhaust is calculated by using the following equation [14], …”

Section: Exergy Analysismentioning

confidence: 99%

“…They concluded that waste heat recovery efficiency is between 60 and 70 % for most of the engine's operating region, also they mentioned that heat transfer area for a finned-tube evaporator should be selected carefully based on the engine's most typical operating region. Recently, Hossain and Bari [14,15] applied a new HEX for a diesel engine experimentally and numerically. They applied SST k -x for their modeling and optimized the working fluid pressure and the orientation of heat exchangers which found the additional power increased from 16 to 23.7 %.…”

Section: Introductionmentioning

confidence: 99%

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Investigations of fin geometry on heat exchanger performance by simulation and optimization methods for diesel exhaust application

Hatami

Ganji

Gorji-Bandpy

2015

Neural Comput & Applic

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In this paper, three cases of heat exchangers (HEXs) in the exhaust of a diesel engine are modeled numerically for improving the exergy recovery amount. Simple double pipes, longitudinal and circular finned-tube HEXs are modeled to study the fin effect in waste heat recovery amount. It is tried to compare the circular and longitudinal fin's effect (with the same surface area) on exergy recovery and pressure drop in the exhaust. As a main outcome, results show that circular fins cannot enhance exergy recovery due to trapping the gases between them and producing a high pressure drop compared to longitudinal fins. Also, L 16 Taguchi array is applied to find the most important parameters in longitudinal fins to find the optimum design for this heat exchanger. Finally, a multi-objective optimization by central composite design is applied to find the optimum dimensions of proposed HEX in different engine loads.

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Section: Exergy Analysismentioning

confidence: 99%

“…By considering some assumptions for simplification of the combustion product as ideal gas, the specific exergy of the exhaust is calculated by using the following equation [14], …”

Section: Exergy Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigations of fin geometry on heat exchanger performance by simulation and optimization methods for diesel exhaust application

Hatami

Ganji

Gorji-Bandpy

2015

Neural Comput & Applic

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“…On the base of the reviewed articles [5][6][7][8][9][10][11][12][13] the tube heat exchangers were most commonly used. The efficiency varied from 24 % to 76 % depending on the design and operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on Rankine cycle evaporator efficiency intended for exhaust waste heat recovery of a diesel engine

et al. 2017

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Abstract. The paper pressents an experimental study of Rankine cycle evaporator efficiency. Water was chosen as the working fluid in the system. The experimental test was conducted on a test bench equipped with a burner charged by compressed fresh air. Generated exhaust gases parameters were previously determined over the diesel engine operating range (28 engine operating points were studied). For each test point the working fluid parameters (flow rate and evaporating pressure) were varied. Thus, the enthalpy flow through the heat exchanger was determined. Heat exchanger was designed as 23 helical tubes are inserted. On the basis of the results, it was found out that efficiency varies from 25 % to 51,9 %. The optimal working fluid pressure is 20 bar at most of the operating points while the optimum fluid mass flow rate varies from 2 g/s to 10 g/s.

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“…The objective of the turbocharger is to increase engine torque and the specific power output with no or slight bsfc reductions less than 1% [10]. Indeed, a turbocharged diesel engine still rejects 35-40% of input energy through the exhaust gas [11]. Therefore, WHR applications can also be found in turbocharged engines.…”

Section: Introductionmentioning

confidence: 99%

Study of Organic Rankine Cycles for Waste Heat Recovery in Transportation Vehicles

Pascual¹

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Regulations for ICE-based transportation in the EU seek carbon dioxide emissions lower than 95 g CO 2 /km by 2020. In order to fulfill these limits, improvements in vehicle fuel consumption have to be achieved. One of the main losses of ICEs happens in the exhaust line. Internal combustion engines transform chemical energy into mechanical energy through combustion; however, only about 15-32% of this energy is effectively used to produce work, while most of the fuel energy is wasted through exhaust gases and coolant. Therefore, these sources can be exploited to improve the overall efficiency of the engine. Between these sources, exhaust gases show the largest potential of Waste Heat Recovery (WHR) due to its high level of exergy. Regarding WHR technologies, Rankine cycles are considered as the most promising candidates for improving Internal Combustion Engines. However, the implementation of this technology in modern passenger cars requires additional features to achieve a compact integration and controllability in the engine. While industrial applications typically operates in steady state operating points, there is a huge challenge taking into account its impact in the engine during typical daily driving profiles.This thesis contributes to the knowledge and characterization of an Organic Rankine Cycle coupled with an Internal Combustion Engine using ethanol as working fluid and a swash-plate expander as expansion machine. The main objective of this research work is to obtain and quantify the potential of Organic Rankine Cycles for the use of residual energy in automotive engines. To do this, an experimental ORC test bench was designed and built at CMT (Polytechnic University of Valencia), which can be coupled to different types of automotive combustion engines. Using these results, an estimation of the main variables of the cycle was obtained both in stationary and transient operating points. A potential of increasing ICE mechanical efficiency up to 3.7% could be reached at points of high load installing an ORC in a conventional turbocharged gasoline engine. Regarding transient conditions, a slightly simple and robust control based on adaptive PIDs, allows the control of the ORC in realistic driving profiles. High loads and hot conditions should be the starting ideal conditions to test and validate the control of the ORC in order to achieve high exhaust temperatures that justify the feasibility of the system.In order to deepen in the viability and characteristics of this particular application, some theoretical studies were done. A 1D model was developed using LMS Imagine.Lab Amesim platform. A potential improvement of 2.5% in fuel conversion efficiency was obtained at the high operating points as a direct consequence of the 23.5 g/kWh reduction in bsfc. To conclude, a thermo-economic study was developed taking into account the main elements of the installation costs and a minimum Specific Investment Cost value of 2030 C/kW was obtained. Moreover, an exergetic study showed that a total amount of 3.75 kW...

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Waste heat recovery from the exhaust of a diesel generator using Rankine Cycle

Cited by 79 publications

References 40 publications

Investigations of fin geometry on heat exchanger performance by simulation and optimization methods for diesel exhaust application

Investigations of fin geometry on heat exchanger performance by simulation and optimization methods for diesel exhaust application

Experimental study on Rankine cycle evaporator efficiency intended for exhaust waste heat recovery of a diesel engine

Study of Organic Rankine Cycles for Waste Heat Recovery in Transportation Vehicles

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