On thermoeconomics of energy systems at variable load conditions: integrated optimization of plant design and operation

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Abstract

Thermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems, its differentmethodologies 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 quasisteadyoperation, but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variableenergy demand. In this paper, the fundamentals of thermoeconomics for systems operated at variable load are discussed, examiningthe cost formation process and, separately, the cost fractions related to capital depreciation (which require additional distinctions withrespect to plants in steady operation) and to exergy consumption. The relevant effects of the efficiency penalty due to off design operationon the exergetic cost of internal flows are also examined. An original algorithm is proposed for the integrated optimization of plantdesign 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 demonstrativepurposes, the proposed thermoeconomically aided optimization is performed for a grid connected trigeneration system to be installed ina large hotel.
Lingua originaleEnglish
pagine (da-a)2341-2355
RivistaEnergy Conversion and Management
Volume48, Issue 8
Stato di pubblicazionePublished - 2007

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Cost accounting
Depreciation
Costs
Hotels
Lagrange multipliers
Exergy
Energy conservation
Hot Temperature
Design optimization

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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title = "On thermoeconomics of energy systems at variable load conditions: integrated optimization of plant design and operation",
abstract = "Thermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems, its differentmethodologies 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 quasisteadyoperation, but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variableenergy demand. In this paper, the fundamentals of thermoeconomics for systems operated at variable load are discussed, examiningthe cost formation process and, separately, the cost fractions related to capital depreciation (which require additional distinctions withrespect to plants in steady operation) and to exergy consumption. The relevant effects of the efficiency penalty due to off design operationon the exergetic cost of internal flows are also examined. An original algorithm is proposed for the integrated optimization of plantdesign 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 demonstrativepurposes, the proposed thermoeconomically aided optimization is performed for a grid connected trigeneration system to be installed ina large hotel.",
keywords = "Thermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems, 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, examining the cost formation process and, expressed either in terms of net cash flow or primary energy saving. The method is suitable for application in complex energy systems, its different methodologies allowing solution of problems in the fields of cost accounting, plant design optimisation and diagnostic of malfunctions. However, separately, such as ‘‘facilities of components of a same product’’ connected to external networks for power or heat distribution. For demonstrative purposes, 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, the fundamentals of thermoeconomics for systems operated at variable load are discussed, the proposed thermoeconomically aided optimization is performed for a grid connected trigeneration system to be installed in a large hotel., the thermoeconomic methodologies as such are particularly appropriate to analyse large industrial systems at steady or quasisteady operation",
author = "Fabio Cardona and Antonio Piacentino and Cardona",
year = "2007",
language = "English",
volume = "48, Issue 8",
pages = "2341--2355",
journal = "Energy Conversion and Management",
issn = "0196-8904",
publisher = "Elsevier Limited",

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T1 - On thermoeconomics of energy systems at variable load conditions: integrated optimization of plant design and operation

AU - Cardona, Fabio

AU - Piacentino, Antonio

AU - Cardona, null

PY - 2007

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N2 - Thermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems, its differentmethodologies 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 quasisteadyoperation, but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variableenergy demand. In this paper, the fundamentals of thermoeconomics for systems operated at variable load are discussed, examiningthe cost formation process and, separately, the cost fractions related to capital depreciation (which require additional distinctions withrespect to plants in steady operation) and to exergy consumption. The relevant effects of the efficiency penalty due to off design operationon the exergetic cost of internal flows are also examined. An original algorithm is proposed for the integrated optimization of plantdesign 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 demonstrativepurposes, the proposed thermoeconomically aided optimization is performed for a grid connected trigeneration system to be installed ina large hotel.

AB - Thermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems, its differentmethodologies 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 quasisteadyoperation, but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variableenergy demand. In this paper, the fundamentals of thermoeconomics for systems operated at variable load are discussed, examiningthe cost formation process and, separately, the cost fractions related to capital depreciation (which require additional distinctions withrespect to plants in steady operation) and to exergy consumption. The relevant effects of the efficiency penalty due to off design operationon the exergetic cost of internal flows are also examined. An original algorithm is proposed for the integrated optimization of plantdesign 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 demonstrativepurposes, the proposed thermoeconomically aided optimization is performed for a grid connected trigeneration system to be installed ina large hotel.

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KW - 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

KW - examining the cost formation process and

KW - expressed either in terms of net cash flow or primary energy saving. The method is suitable for application in complex energy systems

KW - its different methodologies allowing solution of problems in the fields of cost accounting

KW - plant design optimisation and diagnostic of malfunctions. However

KW - separately

KW - such as ‘‘facilities of components of a same product’’ connected to external networks for power or heat distribution. For demonstrative purposes

KW - 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 co

KW - the fundamentals of thermoeconomics for systems operated at variable load are discussed

KW - the proposed thermoeconomically aided optimization is performed for a grid connected trigeneration system to be installed in a large hotel.

KW - the thermoeconomic methodologies as such are particularly appropriate to analyse large industrial systems at steady or quasisteady operation

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VL - 48, Issue 8

SP - 2341

EP - 2355

JO - Energy Conversion and Management

JF - Energy Conversion and Management

SN - 0196-8904

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