The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Ibrahim Dincer - One of the best experts on this subject based on the ideXlab platform.
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PERFORMANCE ASSESSMENT OF Cogeneration PLANTS
Energy Conversion and Management, 2020Co-Authors: Mehmet Kanoglu, Ibrahim DincerAbstract:In this paper, performance assessment of various building Cogeneration systems is conducted through energy and exergy efficiencies. The Cogeneration plants considered include steam-turbine system, gas-turbine system, diesel-engine system, and geothermal system. Here, the Cogeneration operation refers to the simultaneous generation of electrical power and heating for buildings (especially for space heating and hot water). Selected actual operating data are employed for analysis and performance assessment. The same amount of electrical and thermal product outputs is considered for all systems, except the diesel, to facilitate comparisons. Also, the effects of certain operating parameters (e.g., steam pressure, water temperature) on the energy and exergy efficiencies are investigated. The diesel-engine and geothermal systems appear to be thermodynamically more attractive, in that they have higher exergy efficiencies, than steam-turbine and gas-turbine systems. The results demonstrate that exergy analysis is a useful tool in performance assessments of Cogeneration systems and permits meaningful comparisons of different Cogeneration systems based on their merits. Such results can allow the efficiency of Cogeneration systems to be increased, and the applications of Cogeneration in larger energy systems to be configured more beneficially, leading to reductions in fuel use and environmental emissions.
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Energetic and exergetic performance analyses of a combined heat and power plant with absorption inlet cooling and evaporative aftercooling
Energy, 2011Co-Authors: Abdul Khaliq, Ibrahim DincerAbstract:In this paper, exergy method is applied to analyze the gas turbine cycle Cogeneration with inlet air cooling and evaporative aftercooling of the compressor discharge. The exergy destruction rate in each component of Cogeneration is evaluated in detail. The effects of some main parameters on the exergy destruction and exergy efficiency of the cycle are investigated. The most significant exergy destruction rates in the cycle are in combustion chamber, heat recovery steam generator and regenerative heat exchanger. The overall pressure ratio and turbine inlet temperature have significant effect on exergy destruction in most of the components of Cogeneration. The results obtained from the analysis show that inlet air cooling along with evaporative aftercooling has an obvious increase in the energy and exergy efficiency compared to the basic gas turbine cycle Cogeneration. It is further shown that the first-law efficiency, power to heat ratio and exergy efficiency of the Cogeneration cycle significantly vary with the change in overall pressure ratio and turbine inlet temperature but the change in process heat pressure shows small variation in these parameters. © 2011 Elsevier Ltd.
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Performance assessment of Cogeneration plants
Energy Conversion and Management, 2009Co-Authors: Mehmet Kanoglu, Ibrahim DincerAbstract:In this paper, performance assessment of various building Cogeneration systems is conducted through energy and exergy efficiencies. The Cogeneration plants considered include steam-turbine system, gas-turbine system, diesel-engine system, and geothermal system. Here, the Cogeneration operation refers to the simultaneous generation of electrical power and heating for buildings (especially for space heating and hot water). Selected actual operating data are employed for analysis and performance assessment. The same amount of electrical and thermal product outputs is considered for all systems, except the diesel, to facilitate comparisons. Also, the effects of certain operating parameters (e.g., steam pressure, water temperature) on the energy and exergy efficiencies are investigated. The diesel-engine and geothermal systems appear to be thermodynamically more attractive, in that they have higher exergy efficiencies, than steam-turbine and gas-turbine systems. The results demonstrate that exergy analysis is a useful tool in performance assessments of Cogeneration systems and permits meaningful comparisons of different Cogeneration systems based on their merits. Such results can allow the efficiency of Cogeneration systems to be increased, and the applications of Cogeneration in larger energy systems to be configured more beneficially, leading to reductions in fuel use and environmental emissions. © 2008 Elsevier Ltd. All rights reserved.
William Dhaeseleer - One of the best experts on this subject based on the ideXlab platform.
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the impact of thermal storage on the operational behaviour of residential chp facilities and the overall co2 emissions
Renewable & Sustainable Energy Reviews, 2007Co-Authors: Dries Haeseldonckx, Leen Peeters, Lieve Helsen, William DhaeseleerAbstract:When evaluating the environmental impact of small-scale Cogeneration facilities, two important boundary conditions are often overlooked. Firstly, Cogeneration units are mostly considered as stand-alone facilities, although, in reality, they will be part of a system that may also contain a thermal-storage tank and back-up boiler. Secondly, usually mainly static and simplified methods are used to calculate the possible reduction of CO2 emissions. In this paper, these issues are discussed in two parts. The dimensioning of Cogeneration facilities to fulfil a certain heat demand and the impact of thermal-storage tanks on the operational behaviour of these units are dealt with. It is shown that the use of thermal-storage tanks prolongs the yearly operation time of a CHP facility and allows the Cogeneration unit to operate more continuously. Also, it is clarified how to interpret thermal load-duration diagrams in a correct way. Furthermore, the impact of thermal storage on the overall CO2 emissions is investigated. Hereby, the interaction with the expansion of the central power system and the annual use of the Cogeneration units are two important parameters. Using a small thermal-storage device causes the net reduction of CO2 emissions, in comparison with a reference scenario without additionally installed Cogeneration, to be almost three times higher compared to the case without heat buffer. Finally, it is shown that the operational behaviour of multiple small-scale Cogeneration units can be approximated by the behaviour of one large fictitious unit for the determination of the net reduction of CO2 emissions.
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the impact of the implementation of Cogeneration in a given energetic context
IEEE Power & Energy Magazine, 2002Co-Authors: Kris Voorspools, William DhaeseleerAbstract:In order to evaluate the value of Cogeneration, usually static-simplified criteria are used, neglecting the entire energetic context and the dynamic interaction between Cogeneration and the centralized electric system. Therefore, a dynamic method, based on simulation of scenarios, is proposed. For a given demand for heat and electricity, two scenarios are worked out: a scenario where no additional Cogeneration is installed and a scenario where Cogeneration is added, possibly also resulting in a more moderate expansion of the central power system. To correctly portray the dynamic response of the central power system, it is simulated. The use of this method on concrete possibilities for Cogeneration in Belgium, demonstrates the need for this dynamic method. For industrial Cogeneration, the static simplified method seems valid because of the high and constant utilization of this form of Cogeneration. In the case of Cogeneration in the commercial sector, however, where the heat demand is only present during a limited period of time, the static method is not valid and the environmentally friendly nature of this kind of Cogeneration is less obvious. As a general conclusion, it can be stated that every specific possibility for Cogeneration has to be evaluated separately in its own overall energetic context, including the entire electricity generation system.
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the evaluation of small Cogeneration for residential heating
International Journal of Energy Research, 2002Co-Authors: Kris Voorspools, William DhaeseleerAbstract:The decision whether or not to install small Cogeneration for residential purposes mainly depends on individual economic considerations, combined with ecological awareness. Since in most cases, the economic balance is still unfavourable, government grants are considered in order to bridge this economic barrier. It is however still unclear how these grants are best spent to obtain an optimal environmental benefit. In the case of Cogeneration, mainly static and simplified methods are used, completely neglecting the dynamic interaction between the Cogeneration systems and the central power system and the dynamic response of the Cogeneration units themselves. In this paper, these issues are discussed in two parts. The first part clarifies how an actual Cogeneration unit, if necessary in combination with a back-up boiler and heat storage, will respond to a certain demand. For this purpose, experiments were performed to establish the transient and stationary behaviour of the system. It is shown that the transient heating of the Cogeneration engine is rather slow (e.g. half an hour after cold start, the engine only produced 65% of the heat it would have in stationary regime) where the electric transient behaviour is negligible. In the second part of the paper, dynamic simulations are performed to quantify the impact (primary energy saving and reduction in greenhouse-gas emissions) of the massive installation of Cogeneration for residential heating. Two important parameters are isolated. First, the interaction with the expansion of the central power system is very important. If the installation of Cogeneration prevents the commissioning of new power plants, the potential energy saving and (especially) emission reduction are reduced. The second parameter is the annual use of the Cogeneration units. Here, the potential energy saving and emission reduction increase with increasing annual use. Copyright © 2002 John Wiley & Sons, Ltd.
Mehmet Kanoglu - One of the best experts on this subject based on the ideXlab platform.
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PERFORMANCE ASSESSMENT OF Cogeneration PLANTS
Energy Conversion and Management, 2020Co-Authors: Mehmet Kanoglu, Ibrahim DincerAbstract:In this paper, performance assessment of various building Cogeneration systems is conducted through energy and exergy efficiencies. The Cogeneration plants considered include steam-turbine system, gas-turbine system, diesel-engine system, and geothermal system. Here, the Cogeneration operation refers to the simultaneous generation of electrical power and heating for buildings (especially for space heating and hot water). Selected actual operating data are employed for analysis and performance assessment. The same amount of electrical and thermal product outputs is considered for all systems, except the diesel, to facilitate comparisons. Also, the effects of certain operating parameters (e.g., steam pressure, water temperature) on the energy and exergy efficiencies are investigated. The diesel-engine and geothermal systems appear to be thermodynamically more attractive, in that they have higher exergy efficiencies, than steam-turbine and gas-turbine systems. The results demonstrate that exergy analysis is a useful tool in performance assessments of Cogeneration systems and permits meaningful comparisons of different Cogeneration systems based on their merits. Such results can allow the efficiency of Cogeneration systems to be increased, and the applications of Cogeneration in larger energy systems to be configured more beneficially, leading to reductions in fuel use and environmental emissions.
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Performance assessment of Cogeneration plants
Energy Conversion and Management, 2009Co-Authors: Mehmet Kanoglu, Ibrahim DincerAbstract:In this paper, performance assessment of various building Cogeneration systems is conducted through energy and exergy efficiencies. The Cogeneration plants considered include steam-turbine system, gas-turbine system, diesel-engine system, and geothermal system. Here, the Cogeneration operation refers to the simultaneous generation of electrical power and heating for buildings (especially for space heating and hot water). Selected actual operating data are employed for analysis and performance assessment. The same amount of electrical and thermal product outputs is considered for all systems, except the diesel, to facilitate comparisons. Also, the effects of certain operating parameters (e.g., steam pressure, water temperature) on the energy and exergy efficiencies are investigated. The diesel-engine and geothermal systems appear to be thermodynamically more attractive, in that they have higher exergy efficiencies, than steam-turbine and gas-turbine systems. The results demonstrate that exergy analysis is a useful tool in performance assessments of Cogeneration systems and permits meaningful comparisons of different Cogeneration systems based on their merits. Such results can allow the efficiency of Cogeneration systems to be increased, and the applications of Cogeneration in larger energy systems to be configured more beneficially, leading to reductions in fuel use and environmental emissions. © 2008 Elsevier Ltd. All rights reserved.
M Vellini - One of the best experts on this subject based on the ideXlab platform.
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high efficiency Cogeneration electricity from Cogeneration in chp plants
Energy Procedia, 2015Co-Authors: M Gambini, M VelliniAbstract:Abstract In 2004, the European Parliament and the Council of the European Union adopted the Directive 2004/8 EC whose purpose is to increase energy efficiency and develop high efficiency Cogeneration of heat and power. Italy brought into force this law by means of the Legislative Decree February 8, 2007, n. 20 and two ministerial decrees (the ministerial decree of Environment Ministry (August 4, 2011), that integrates the Decree n.20, and the ministerial decree of Ministry of Economic Development (September 5, 2011), that lays down the conditions and procedures for access to the support system of Cogeneration). From January 1, 2011, the legislative and incentive Cogeneration context is radically changed and, consequently, new boundary conditions must be taken into account in order to evaluate performance of Cogeneration plants. Therefore, in this paper authors have analysed the different types of plants in operation in Italy and have calculated the percentage of electricity from Cogeneration of each type of plant, taking into account the typical operating parameters. The result of this paper may therefore be a valuable tool for the operators of the Cogeneration sector in order to identify the suitability of an investment in this sector.
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high efficiency Cogeneration performance assessment of industrial Cogeneration power plants
Energy Procedia, 2014Co-Authors: M Gambini, M VelliniAbstract:In 2004, the European Parliament and the Council of the European Union adopted the Directive 2004/8 EC whose purpose is to increase energy efficiency and develop high efficiency Cogeneration of heat and power. Italy brought into force this law by means of the Legislative Decree February 8, 2007, n. 20: from January 1, 2011, the high efficiency Cogeneration is the Cogeneration that meets the requirements of Directive 2004/8/EC. Then, Italy adopted two ministerial decrees: the ministerial decree of Environment Ministry (August 4, 2011), that integrates the Decree n.20, and the ministerial decree of Ministry of Economic Development (September 5, 2011), that lays down the conditions and procedures for access to the support system of Cogeneration: for each year in which the requirements of high efficiency Cogeneration are met, the Cogeneration units are entitled to energy efficiency certificates (White Certificates), whose number is proportional to the energy saving achieved. Therefore, from January 1, 2011 the legislative and incentive Cogeneration context is radically changed and, consequently, new boundary conditions must be taken into account for feasibility studies and performance assessments of Cogeneration plants. So, in this paper we want to evaluate the impact of this new legislative context on the competitiveness of the various Cogeneration technologies. To this end, after an illustration of the new criteria to meet the qualifications of the high efficiency Cogeneration, a comparison between different generation technologies will be developed by highlighting the impact of the new incentive context.
M Gambini - One of the best experts on this subject based on the ideXlab platform.
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high efficiency Cogeneration electricity from Cogeneration in chp plants
Energy Procedia, 2015Co-Authors: M Gambini, M VelliniAbstract:Abstract In 2004, the European Parliament and the Council of the European Union adopted the Directive 2004/8 EC whose purpose is to increase energy efficiency and develop high efficiency Cogeneration of heat and power. Italy brought into force this law by means of the Legislative Decree February 8, 2007, n. 20 and two ministerial decrees (the ministerial decree of Environment Ministry (August 4, 2011), that integrates the Decree n.20, and the ministerial decree of Ministry of Economic Development (September 5, 2011), that lays down the conditions and procedures for access to the support system of Cogeneration). From January 1, 2011, the legislative and incentive Cogeneration context is radically changed and, consequently, new boundary conditions must be taken into account in order to evaluate performance of Cogeneration plants. Therefore, in this paper authors have analysed the different types of plants in operation in Italy and have calculated the percentage of electricity from Cogeneration of each type of plant, taking into account the typical operating parameters. The result of this paper may therefore be a valuable tool for the operators of the Cogeneration sector in order to identify the suitability of an investment in this sector.
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high efficiency Cogeneration performance assessment of industrial Cogeneration power plants
Energy Procedia, 2014Co-Authors: M Gambini, M VelliniAbstract:In 2004, the European Parliament and the Council of the European Union adopted the Directive 2004/8 EC whose purpose is to increase energy efficiency and develop high efficiency Cogeneration of heat and power. Italy brought into force this law by means of the Legislative Decree February 8, 2007, n. 20: from January 1, 2011, the high efficiency Cogeneration is the Cogeneration that meets the requirements of Directive 2004/8/EC. Then, Italy adopted two ministerial decrees: the ministerial decree of Environment Ministry (August 4, 2011), that integrates the Decree n.20, and the ministerial decree of Ministry of Economic Development (September 5, 2011), that lays down the conditions and procedures for access to the support system of Cogeneration: for each year in which the requirements of high efficiency Cogeneration are met, the Cogeneration units are entitled to energy efficiency certificates (White Certificates), whose number is proportional to the energy saving achieved. Therefore, from January 1, 2011 the legislative and incentive Cogeneration context is radically changed and, consequently, new boundary conditions must be taken into account for feasibility studies and performance assessments of Cogeneration plants. So, in this paper we want to evaluate the impact of this new legislative context on the competitiveness of the various Cogeneration technologies. To this end, after an illustration of the new criteria to meet the qualifications of the high efficiency Cogeneration, a comparison between different generation technologies will be developed by highlighting the impact of the new incentive context.