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Polygeneration has gained increased attention since it embraces efficient energy utilization while contributing to alleviate environmental pollution. The fossil-fuel dependence of trigeneration/cogeneration systems presses for maximizing energy conversion rates. Waste Heat Recovery (WHR) from natural gas engine exhaust represents a significant opportunity to improve fuel utilization. This study presents a thermoeconomic analysis of a novel WHR system consisting of a Vortex Tube heat booster coupled to the exhaust stream of a 2000 kW natural gas engine that drives a Supercritical CO2 Brayton Cycle (SCBC). SCBC operates under two different configurations, namely Regenerative and Recompression. Results indicate that implementing the Vortex Tube (or Ranque-Hilsch tube) increases energy and exergy efficiencies up to around 1.85% and reduces exergy destruction by approximately 4–8%. The Recompression SCBC features higher thermal and exergy efficiencies, while the Regenerative SCBC results in higher power output. Economic indicators reveal that the energy production cost of the Recompression configuration is significantly lower than that of the Regenerative. The turbine features the highest share of total equipment cost, with around 40–50%, followed by the heater and regenerators. The proposed WHR system can potentially recover up to around 7.8% of the total engine power output and provide an electricity price lower than 0.3 $·kWh−1 with a payback period in the range of 8–12 years. Heat exchangers represent an opportunity to improve thermoeconomic performance since they significantly increase exergy costing and limit overall efficiency. Incorporating high thermal conductivity materials that fulfill safety requirements is vital for improving heat exchanger's performance and developing a cost-effective WHR system.
Daniel Maestre-Cambronel; Joel Guzmán Barros; Arturo Gonzalez-Quiroga; Antonio Bula; Jorge Duarte-Forero. Thermoeconomic analysis of improved exhaust waste heat recovery system for natural gas engine based on Vortex Tube heat booster and supercritical CO2 Brayton cycle. Sustainable Energy Technologies and Assessments 2021, 47, 101355 .
AMA StyleDaniel Maestre-Cambronel, Joel Guzmán Barros, Arturo Gonzalez-Quiroga, Antonio Bula, Jorge Duarte-Forero. Thermoeconomic analysis of improved exhaust waste heat recovery system for natural gas engine based on Vortex Tube heat booster and supercritical CO2 Brayton cycle. Sustainable Energy Technologies and Assessments. 2021; 47 ():101355.
Chicago/Turabian StyleDaniel Maestre-Cambronel; Joel Guzmán Barros; Arturo Gonzalez-Quiroga; Antonio Bula; Jorge Duarte-Forero. 2021. "Thermoeconomic analysis of improved exhaust waste heat recovery system for natural gas engine based on Vortex Tube heat booster and supercritical CO2 Brayton cycle." Sustainable Energy Technologies and Assessments 47, no. : 101355.
Alternative fuels for internal combustion engines (ICE) emerge as a promising solution for a more sustainable operation. This work assesses combustion and performance of the dual-fuel operation in the spark ignition (SI) engine that simultaneously integrates acetone–butanol–ethanol (ABE) and hydroxy (HHO) doping. The study evaluates four fuel blends that combine ABE 5, ABE 10, and an HHO volumetric flow rate of 0.4 LPM. The standalone gasoline operation served as the baseline for comparison. We constructed an experimental test bench to assess operation conditions, fuel mode, and emissions characteristics of a 3.5 kW-YAMAHA engine coupled to an alkaline electrolyzer. The study proposes thermodynamic and combustion models to evaluate the performance of the dual-fuel operation based on in-cylinder pressure, heat release rate, combustion temperature, fuel properties, energy distribution, and emissions levels. Results indicate that ABE in the fuel blends reduces in-cylinder pressure by 10–15% compared to the baseline fuel. In contrast, HHO boosted in-cylinder pressure up to 20%. The heat release rate and combustion temperature follow the same trend, corroborating that oxygen enrichment enhances gasoline combustion. The standalone ABE operation raises fuel consumption by around 10–25
Wilson Guillin-Estrada; Daniel Maestre-Cambronel; Antonio Bula-Silvera; Arturo Gonzalez-Quiroga; Jorge Duarte-Forero. Combustion and Performance Evaluation of a Spark Ignition Engine Operating with Acetone–Butanol–Ethanol and Hydroxy. Applied Sciences 2021, 11, 5282 .
AMA StyleWilson Guillin-Estrada, Daniel Maestre-Cambronel, Antonio Bula-Silvera, Arturo Gonzalez-Quiroga, Jorge Duarte-Forero. Combustion and Performance Evaluation of a Spark Ignition Engine Operating with Acetone–Butanol–Ethanol and Hydroxy. Applied Sciences. 2021; 11 (11):5282.
Chicago/Turabian StyleWilson Guillin-Estrada; Daniel Maestre-Cambronel; Antonio Bula-Silvera; Arturo Gonzalez-Quiroga; Jorge Duarte-Forero. 2021. "Combustion and Performance Evaluation of a Spark Ignition Engine Operating with Acetone–Butanol–Ethanol and Hydroxy." Applied Sciences 11, no. 11: 5282.
The study presents a complete one-dimensional model to evaluate the parameters that describe the operation of a Proton Exchange Membrane (PEM) electrolyzer and PEM fuel cell. The mathematical modeling is implemented in Matlab/Simulink® software to evaluate the influence of parameters such as temperature, pressure, and overpotentials on the overall performance. The models are further merged into an integrated electrolyzer-fuel cell system for electrical power generation. The operational description of the integrated system focuses on estimating the overall efficiency as a novel indicator. Additionally, the study presents an economic assessment to evaluate the cost-effectiveness based on different economic metrics such as capital cost, electricity cost, and payback period. The parametric analysis showed that as the temperature rises from 30 to 70 °C in both devices, the efficiency is improved between 5-20%. In contrast, pressure differences feature less relevance on the overall performance. Ohmic and activation overpotentials are highlighted for the highest impact on the generated and required voltage. Overall, the current density exhibited an inverse relation with the efficiency of both devices. The economic evaluation revealed that the integrated system can operate at variable load conditions while maintaining an electricity cost between 0.3-0.45 $/kWh. Also, the capital cost can be reduced up to 25% while operating at a low current density and maximum temperature. The payback period varies between 6-10 years for an operational temperature of 70 °C, which reinforces the viability of the system. Overall, hydrogen-powered systems stand as a promising technology to overcome energy transition as they provide robust operation from both energetic and economic viewpoints.
Rony Escobar-Yonoff; Daniel Maestre-Cambronel; Sebastián Charry; Adriana Rincón-Montenegro; Ivan Portnoy. Performance assessment and economic perspectives of integrated PEM fuel cell and PEM electrolyzer for electric power generation. Heliyon 2021, 7, e06506 .
AMA StyleRony Escobar-Yonoff, Daniel Maestre-Cambronel, Sebastián Charry, Adriana Rincón-Montenegro, Ivan Portnoy. Performance assessment and economic perspectives of integrated PEM fuel cell and PEM electrolyzer for electric power generation. Heliyon. 2021; 7 (3):e06506.
Chicago/Turabian StyleRony Escobar-Yonoff; Daniel Maestre-Cambronel; Sebastián Charry; Adriana Rincón-Montenegro; Ivan Portnoy. 2021. "Performance assessment and economic perspectives of integrated PEM fuel cell and PEM electrolyzer for electric power generation." Heliyon 7, no. 3: e06506.
Internal combustion engines are widely implemented in several applications; however, they still face significant challenges due to the sealing capacity of the compression rings. Gas leakage through the crankcase, also known as blow-by, directly impacts power losses, overall efficiency, and global emissions. Therefore, the present study investigates the influence of parameters such as the ring gap, ring masses, and twist angle of the compression rings on the sealing capacity of the combustion chamber. A mathematical model is proposed to account for geometric, dynamic, and operational characteristics in a single-cylinder diesel engine. The results indicated that the greatest gas losses to the crankcase occur during the compression and combustion stages as a consequence of extreme pressure conditions. Specifically, at least 0.5% of the gases locked in the combustion chamber are released on each cycle, while increasing the mass of the compression rings boosts the gas leakage due to higher inertial forces in the rings. In contrast, a positive twist angle of the compression rings reduced the combustion gases leakage by
Brando Hernández-Comas; Daniel Maestre-Cambronel; Carlos Pardo-García; Marlen Fonseca-Vigoya; Jhon Pabón-León. Influence of Compression Rings on the Dynamic Characteristics and Sealing Capacity of the Combustion Chamber in Diesel Engines. Lubricants 2021, 9, 25 .
AMA StyleBrando Hernández-Comas, Daniel Maestre-Cambronel, Carlos Pardo-García, Marlen Fonseca-Vigoya, Jhon Pabón-León. Influence of Compression Rings on the Dynamic Characteristics and Sealing Capacity of the Combustion Chamber in Diesel Engines. Lubricants. 2021; 9 (3):25.
Chicago/Turabian StyleBrando Hernández-Comas; Daniel Maestre-Cambronel; Carlos Pardo-García; Marlen Fonseca-Vigoya; Jhon Pabón-León. 2021. "Influence of Compression Rings on the Dynamic Characteristics and Sealing Capacity of the Combustion Chamber in Diesel Engines." Lubricants 9, no. 3: 25.