Search results for " trigeneration"

showing 3 items of 3 documents

Assessing the feasibility of cogeneration retrofit and district heating/cooling networks in small Italian islands

2017

Sustainability of energy supply strategies in small islands has been emerging as a severe issue, due to the large margins for improvement and rationalization of the most frequently adopted solutions. In most of the European islands, large amounts of heat are wasted by the operation of engine-based power plants; conversely, heat is produced by boilers (supplied by liquid fuels) or by electric equipment for a number of different uses, like domestic hot water production or space heating in winter. In this paper a techno-economic analysis is proposed to assess the feasibility of CHP-retrofit of the existing power plants and the possible utilization of the recovered heat to supply, via a distric…

Engineering020209 energyHeating cooling02 engineering and technologyIndustrial and Manufacturing EngineeringCogeneration020401 chemical engineeringEnvironmental protectionHeat densityHeat recovery ventilation0202 electrical engineering electronic engineering information engineeringSettore ING-IND/10 - Fisica Tecnica IndustrialeCogeneration District heating/cooling Economic viability Energy analysis Energy load assessment Small islands TrigenerationEnergy supply0204 chemical engineeringElectrical and Electronic EngineeringCivil and Structural EngineeringCogeneration trigeneration residential/tertiary energy uses load estimation district heating/cooling small islands energy analysis economic viability.Settore ING-IND/11 - Fisica Tecnica AmbientaleWaste managementbusiness.industryMechanical EngineeringElectric equipmentBuilding and ConstructionPollutionGeneral EnergySustainabilityPublic supportbusiness
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On thermoeconomics of energy systems at variable load conditions: integrated optimization of plant design and operation

2007

Abstract Thermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems, its different methodologies allowing solution of problems in the fields of cost accounting, plant design optimisation and diagnostic of malfunctions. However, the thermoeconomic methodologies as such are particularly appropriate to analyse large industrial systems at steady or quasi-steady operation, but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variable energy demand. In this paper, the fundamentals of thermoeconomics for systems operated at variable load are discussed, examining the cost formation process an…

ExergyEngineeringPrimary energyRenewable Energy Sustainability and the Environmentbusiness.industryThermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems its different methodologies allowing solution of problems in the fields of cost accounting plant design optimisation and diagnostic of malfunctions. However the thermoeconomic methodologies as such are particularly appropriate to analyse large industrial systems at steady or quasisteady operation but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variable energy demand. In this paper the fundamentals of thermoeconomics for systems operated at variable load are discussed examining the cost formation process and separately the cost fractions related to capital depreciation (which require additional distinctions with respect to plants in steady operation) and to exergy consumption. The relevant effects of the efficiency penalty due to off design operation on the exergetic cost of internal flows are also examined. An original algorithm is proposed for the integrated optimization of plant design and operation based on an analytical solution by the Lagrange multipliers method and on a multi-objective decision function expressed either in terms of net cash flow or primary energy saving. The method is suitable for application in complex energy systems such as ‘‘facilities of components of a same product’’ connected to external networks for power or heat distribution. For demonstrative purposes the proposed thermoeconomically aided optimization is performed for a grid connected trigeneration system to be installed in a large hotel.Energy Engineering and Power TechnologyCost accountingThermoeconomicsGridEnergy conservationVariable (computer science)symbols.namesakeFuel TechnologyNuclear Energy and EngineeringLagrange multipliersymbolsProcess engineeringbusinessSimulation
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On the Reliability of Optimization Results for Trigeneration Systems in Buildings, in the Presence of Price Uncertainties and Erroneous Load Estimati…

2016

Cogeneration and trigeneration plants are widely recognized as promising technologies for increasing energy efficiency in buildings. However, their overall potential is scarcely exploited, due to the difficulties in achieving economic viability and the risk of investment related to uncertainties in future energy loads and prices. Several stochastic optimization models have been proposed in the literature to account for uncertainties, but these instruments share in a common reliance on user-defined probability functions for each stochastic parameter. Being such functions hard to predict, in this paper an analysis of the influence of erroneous estimation of the uncertain energy loads and pric…

OptimizationMathematical optimizationEngineeringenergy loadControl and OptimizationLinear programming020209 energyEnergy Engineering and Power TechnologyPrice02 engineering and technologycogeneration; trigeneration; buildings; optimization; linear programming; stochastic; uncertainty; sensitivity; energy loads; priceslcsh:TechnologyCogenerationbuildingSettore ING-IND/10 - Fisica Tecnica Industriale0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringEngineering (miscellaneous)Integer programminglcsh:TTrigenerationRenewable Energy Sustainability and the Environmentbusiness.industryUncertaintylinear programmingcogenerationsensitivitybuildingsStochasticPower (physics)energy loadsProfitability indexStochastic optimizationElectricitybusinesspricesEnergy (miscellaneous)Efficient energy useEnergies; Volume 9; Issue 12; Pages: 1049
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