Thermo-economic assessment of a micro CHP system fuelled by geothermal and solar energy

Tempesti, Duccio; Fiaschi, Daniele

doi:10.1016/j.energy.2013.01.058

Cited by 89 publications

(36 citation statements)

References 18 publications

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“…A mole fraction of 60% isobutane leads to a reduction of EGC of 4.0% compared to propane. In general, the obtained SIC are in a good agreement to the mentioned investigations [40][41][42][43]. In the context of the uncertainties of fluid properties, a sensitivity analysis is conducted for propane/isobutane (50/50).…”

Section: Economic Parameterssupporting

confidence: 63%

“…Existing thermo-economic analysis related to ORC power systems focus on fluid selection concerning pure working fluids and power plant configurations, like combined heat and power generation or other complex systems [32][33][34][35][36][37][38][39][40][41][42][43]. Regarding ORC power plants for waste heat recovery with an electric capacity below 5 kW, Quoilin et al [39] determine specific investment costs for 8 working fluids in the range of 2,136 €/kW and 4,260 €/kW.…”

Section: Introductionmentioning

confidence: 99%

“…In case of geothermal fluid temperature of 150 °C minimal specific investment costs of 2,500 €/kW result. Tempesti and Fiaschi [43] investigate a hybrid ORC power plant using geothermal and solar energy for three pure working fluids. In this context, R245fa leads to the lowest electricity generation costs between 93 and 120 €/MWh depending on design month.…”

Section: Introductionmentioning

confidence: 99%

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Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

Heberle

Brüggemann

2015

Energies

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Abstract:We present a thermo-economic evaluation of binary power plants based on the Organic Rankine Cycle (ORC) for geothermal power generation. The focus of this study is to analyse if an efficiency increase by using zeotropic mixtures as working fluid overcompensates additional requirements regarding the major power plant components. The optimization approach is compared to systems with pure media. Based on process simulations, heat exchange equipment is designed and cost estimations are performed. For heat source temperatures between 100 and 180 °C selected zeotropic mixtures lead to an increase in second law efficiency of up to 20.6% compared to pure fluids. Especially for temperatures about 160 °C, mixtures like propane/isobutane, isobutane/isopentane, or R227ea/R245fa show lower electricity generation costs compared to the most efficient pure fluid. In case of a geothermal fluid temperature of 120 °C, R227ea and propane/isobutane are cost-efficient working fluids. The uncertainties regarding fluid properties of zeotropic mixtures, mainly affect the heat exchange surface. However, the influence on the determined economic parameter is marginal. In general, zeotropic mixtures are a promising approach to improve the economics of geothermal ORC systems. Additionally, the use of mixtures increases the spectrum of potential working fluids, which is important in context of present and future legal requirements considering fluorinated refrigerants.

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Section: Economic Parameterssupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

Heberle

Brüggemann

2015

Energies

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“…A similar study is also presented by Zhou et al (2013). The combination of solar and geothermal heat sources powering ORC is also studied by Tempesti and Fiaschi (2013;Tempesti et al, 2012). Their studies show that R245fa allows the achievement of the lowest price of electricity production and the lowest overall cost of the CHP plant.…”

Section: Introductionmentioning

confidence: 86%

A Novel Prototype of a Small-Scale Solar Power Plant: dynamic Simulation and Thermoeconomic Analysis

Buonomano¹,

Calise²,

Vicidomini³

2016

American Journal of Engineering and Applied Sciences

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Abstract:The paper presents an innovative prototype of a solar power plant, purposely designed for small-scale applications such as residential and/or small commercial buildings. The system consists of 10 kW e Organic Rankine Cycle (ORC) plant and innovative solar thermal collectors. In particular, 235 m 2 of flat-plate evacuated solar collectors are designed to heat diathermic oil up to 180°C. A variable volume pump is managed by a feedback controller in order to obtain the desired outlet set point temperature for the different weather/load conditions. The hot diathermic oil passes through a storage tank, which is adopted with the purpose to reduce the oscillations due to the solar radiation variability. By means of the tank, a better exploitation of solar energy is also achieved, reducing the time-shift between production and demand. For achieving a constant ORC inlet temperature the tank outlet hot diathermic oil passes through a gas-fired burner, which provides auxiliary additional thermal energy. Therefore, the ORC simultaneously produces electrical energy and low temperature (45°C) cogeneration heat. This solar power plant was dynamically simulated in TRNSYS environment. The simulation tool includes a novel model in order to simulate the dynamic thermal behavior of solar collectors, whereas the ORC dynamic was simulated by means of a performance data map provided by the manufacturer. The model also includes a tool for the calculation of energy and economic parameters and the evaluation of the optimum thermoeconomic configuration. Results indicated that the best pay-back period is obtained for a solar field area of about 200 m 2 and a solar fraction of about 75%. Nevertheless, the system may be competitive from the economic point of view only if incentives can be made available, as commonly occurs for renewable applications, i.e., solar systems. This prototypal system aims to become a potential solar power system for small residential and/or commercial buildings. The presented study will be suitably used as a basis for the installation of a working prototype in located Naples, Italy.

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“…In particular, Astolfi et al [29] analysed a combined concentrating solar power system and a geothermal binary plant powering an ORC, and they obtained a levelized costs of electricity of 145-280 €/MWh (competitive value with respect to large, stand-alone concentrating solar power plants [29]) depending on the location of the plant. Tempesti et al [30,31] investigated the combination of geothermal heat sources and solar powering a ORC system, and also Zhou et al [32] studied these hybrid plants, concluding that the cost of electricity production can be reduced by 20% when this technology is used instead of the stand-alone Enhanced Geothermal System (EGS) [32]. Zhou [33] developed a model simulation of a hybrid geothermal solar both subcritical and supercritical ORC using Aspen to compare the two configurations, and results showed that the solar to electricity cost of supercritical ORC is about 1.5%-3.3% less than those of the subcritical system.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Simulation and Exergo-Economic Optimization of a Hybrid Solar–Geothermal Cogeneration Plant

2015

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This paper presents a dynamic simulation model and a parametric analysis of a solar-geothermal hybrid cogeneration plant based on an Organic Rankine Cycle (ORC) powered by a medium-enthalpy geothermal resource and a Parabolic Trough Collector solar field. The fluid temperature supplying heat to the ORC varies continuously as a function of the solar irradiation, affecting both the electrical and thermal energies produced by the system. Thus, a dynamic simulation was performed. The ORC model, developed in Engineering Equation Solver, is based on zero-dimensional energy and mass balances and includes specific algorithms to evaluate the off-design system performance. The overall simulation model of the solar-geothermal cogenerative plant was implemented in the TRNSYS environment. Here, the ORC model is imported, whereas the models of the other components of the system are developed on the basis of literature data. Results are analyzed on different time bases presenting energetic, economic and exergetic performance data. Finally, a rigorous optimization has been performed to determine the set of system design/control parameters minimizing simple payback period and exergy destruction rate. The system is profitable when a significant amount of the heat produced is consumed. The highest irreversibilities are due to the solar field and to the heat exchangers. OPEN ACCESSEnergies 2015, 8 2607

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Thermo-economic assessment of a micro CHP system fuelled by geothermal and solar energy

Cited by 89 publications

References 18 publications

Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

A Novel Prototype of a Small-Scale Solar Power Plant: dynamic Simulation and Thermoeconomic Analysis

Dynamic Simulation and Exergo-Economic Optimization of a Hybrid Solar–Geothermal Cogeneration Plant

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