Computer-aided working-fluid design, thermodynamic optimisation and thermoeconomic assessment of ORC systems for waste-heat recovery

This paper proposes the configuration of an Organic Rankine Cycle (ORC) coupled to a solar domestic hot water system (SDHWS) with the purpose of analyzing the cogeneration capacity of the system. A simulation of the SDHWS was conducted at different temperatures, observing its performance to determine the amounts of useable heat generated by the solar collector; thus, from an energy balance point of view, the amount of heat that may be used by the ORC could be determined. The working fluid that would be suitable for the temperatures and pressures in the system was selected. The best fluid for the given conditions of superheated vapor at 120 °C and 604 kPa and a condensation temperature of 60 °C and 115 kPa was acetone. The main parameters for the expander thermodynamic design that may be used by the ORC were obtained, with the possibility of generating 443 kWh of annual electric energy with 6.65% global efficiency of solar to electric power, or an overall efficiency of the cogeneration system of 56.35% with a solar collector of 2.84 m2.

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“…For this particular study a pump efficiency of

[ 12 , 15 , 16 , 51 , 52 ] is considered. The power required by the pump can be calculated by

…”

Section: Expandermentioning

confidence: 99%

Design and Analysis of the Domestic Micro-Cogeneration Potential for an ORC System Adapted to a Solar Domestic Hot Water System

Leal-Chávez

Beltran-Chacon

Cardenas-Terrazas

et al. 2019

Entropy

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“…Considering the maximum temperature of the waste heat of 270 °C and the minimum temperature constrain, Maraver et al [24] concludes that pentane is the optimum fluid within the 300 to 120 °C temperature boundary and White et al [29] indicates that pentane achieves the lowest specific investment cost for a maximum temperature of 250 °C. However, Invernizzi, Iora, and Silva [12] state that although pentane obtained the best thermodynamic performance when designing a bottoming ORC for a 100 kWe micro turbine, the hexamethyldisiloxane (MM) expander size parameter is more suitable.…”

Section: Working Fluidmentioning

confidence: 99%

A Review on Combining Micro Gas Turbines with Organic Rankine Cycles

et al. 2019

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Current energy conversion machines such as the micro gas turbine can be improved by harvesting the low-grade energy of the exhaust. A prominent option for such is the organic Rankine cycle due to its relatively efficient and reliable design. This manuscript presents a review on the subject and is the first step toward the design of an organic Rankine cycle bottoming a 100 kWe recuperated gas turbine. After introducing and covering the historical development of the technology, appropriate guidelines for defining the cycle arrangement and selecting the fluid are presented. At last, the viability of the cycle is assessed by assuming an appropriate efficiency value and general cost functions. The organic Rankine is expected to generate an additional 16.6 kWe of power, increasing the electrical efficiency from 30 to 35%. However, the capital cost increase was estimated in 48%.

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“…14 The discrete molecular structure makes the integrated design problem a challenging mixedinteger nonlinear programming (MINLP) problem (for a recent review see Papadopoulos et al 1 ). In literature, frameworks for integrated design based on CAMD have been developed, for example, for the design of working fluids for ORCs, [15][16][17][18][19][20][21][22][23] refrigerants for heat pumps, 24,25 mixtures, 25,26 solvents for absorption processes, [27][28][29][30][31][32][33] extraction processes, 34,35 or reactions. 36 Methods for the integrated design of processes and molecules usually consider a fixed predefined process flowsheet configuration.…”

Section: Introductionmentioning

confidence: 99%

Integrating superstructure‐based design of molecules, processes, and flowsheets

2020

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The key to many chemical and energy conversion processes is the choice of the right molecule, for example, used as working fluid. However, the choice of the molecule is inherently coupled to the choice of the right process flowsheet. In this work, we integrate superstructure‐based flowsheet design into the design of processes and molecules. The thermodynamic properties of the molecule are modeled by the PC‐SAFT equation of state. Computer‐aided molecular design enables considering the molecular structure as degree of freedom in the process optimization. To consider the process flowsheet as additional degree of freedom, a superstructure of the process is used. The method results in the optimal molecule, process, and flowsheet. We demonstrate the method for the design of an organic Rankine cycle considering flowsheet options for regeneration, reheating, and turbine bleeding. The presented method provides a user‐friendly tool to solve the integrated design problem of processes, molecules, and process flowsheets.

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Computer-aided working-fluid design, thermodynamic optimisation and thermoeconomic assessment of ORC systems for waste-heat recovery

Cited by 91 publications

References 68 publications

Design and Analysis of the Domestic Micro-Cogeneration Potential for an ORC System Adapted to a Solar Domestic Hot Water System

Design and Analysis of the Domestic Micro-Cogeneration Potential for an ORC System Adapted to a Solar Domestic Hot Water System

A Review on Combining Micro Gas Turbines with Organic Rankine Cycles

Integrating superstructure‐based design of molecules, processes, and flowsheets

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