Thermo-ecological optimization of a solar collector

Szargut, Jan; Stanek, Wojciech

doi:10.1016/j.energy.2006.06.010

Cited by 66 publications

(19 citation statements)

References 2 publications

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“…However, it should be noted that the authors are also planning to conduct the thermoecological and thermoeconomic analyses as they were included in the work [30,32,33].…”

Section: Discussionmentioning

confidence: 99%

“…In order to construct this model, the authors assumed that interconnections between the analyzed integrated oxy-fuel combustion power plant and domestic economy were rather weak, which permitted them to establish indices of thermo-ecological costs concerning fuels, raw materials and semi-products on the basis of a priori knowledge [34]. However, the thermo-ecological optimization of a solar collector was also established [30].…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that due to environmental-impact considerations and energy-conversion efficiency, the renewal and development of heat pumps and CHP systems has been increasing from large-to microscale systems (μCHP) for industrial, building applications and even photovoltaic/thermal (PV/T) configurations or fuel cell CHP systems [17,[21][22][23][24][25][26][27][28][29][30][31][32]. Energy and exergy analyses have been conducted by many authors, for example: (1) a combined heat and power system by Feidt & Costea [28]; (2) a novel hybrid solar heating, cooling and power generation system for remote areas by Zhai et al [22]; (3) a combined molten carbonate fuel cell-gas turbine system by El-Emam & Dincer [25]; (4) a comparison of Proton Exchange Membrane Fuel Cell and Solid Oxide Fuel Cell-based μCHP systems by Barelli et al [27].…”

Section: Introductionmentioning

confidence: 99%

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Exergy Losses in the Szewalski Binary Vapor Cycle

Kowalczyk

Ziółkowski

Badur

2015

Entropy

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Abstract:In this publication, we present an energy and exergy analysis of the Szewalski binary vapor cycle based on a model of a supercritical steam power plant. We used energy analysis to conduct a preliminary optimization of the cycle. Exergy loss analysis was employed to perform a comparison of heat-transfer processes, which are essential for hierarchical cycles. The Szewalski binary vapor cycle consists of a steam cycle bottomed with an organic Rankine cycle installation. This coupling has a negative influence on the thermal efficiency of the cycle. However, the primary aim of this modification is to reduce the size of the power unit by decreasing the low-pressure steam turbine cylinder and the steam condenser. The reduction of the "cold end" of the turbine is desirable from economic and technical standpoints. We present the Szewalski binary vapor cycle in addition to a mathematical model of the chosen power plant's thermodynamic cycle. We elaborate on the procedure of the Szewalski cycle design and its optimization in order to attain an optimal size reduction of the power unit and limit exergy loss.

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“…However, it should be noted that the authors are also planning to conduct the thermoecological and thermoeconomic analyses as they were included in the work [30,32,33].…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exergy Losses in the Szewalski Binary Vapor Cycle

Kowalczyk

Ziółkowski

Badur

2015

Entropy

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“…The detailed description of the TEC-LC method, including the set of equations, can be found in [29], [30] and for this reason is not reported here. In previous works, TEC referring to RES was implemented, for example, to optimize solar collector used for production of hot water [31], as well as for evaluation of biofuel conversion processes [32] or electricity produced in micro-wind turbines [33]. The total thermo-ecological cost can be presented as follows:…”

Section: Methodsmentioning

confidence: 99%

Application of multi-criteria methods to compare different solutions of supplying buildings in electricity from photovoltaic systems

Mendecka

Stoltmann

2016

E3S Web Conf.

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Abstract. Nowadays, the technologies of electricity generation in distributed systems are usually associated with Renewable Energy Sources (RES). The choice of the construction site depends mainly on the availability of the power system. However, energy planning, especially in case of RES, is a complex process involving multiple and often conflicting objectives. The complexity of the selection of the electricity system is typically addressed with the use of multi-criteria tools, involving all of the considered criteria and also different methods of their aggregation. The result is a final ranking of the available alternatives. This paper describes the application of a multi-criteria decision tool for the comparative analysis of the use of alternative options of the PV technology for electricity production. Four decision variants are considered, including the different construction of solar farms (static and movable structure) and different types of configuration of individual installation (off and on-grid). The construction of each new sources of electricity generation, including PV, is the multi-threaded and multi-dimensional decision problem. The criteria used in the analysis combine economic, environmental and social issues. The first of the considered criterion is the Net Present Value (NPV) which determines the economic viability of the project. The second criterion, thermo-ecological cost (TEC), connecting energy and environmental issues. Finally, the Land Use (LU) is considered as a social criterion. As aggregation function, the Weighted Sum Method (WSM) is used. The sensitivity analysis of the criteria weights was performed with the use of a novel method involving Monte Carlo simulation and a method of data reconciliation.

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“…The balance method of TEC calculation is described in Section 2 of the presented paper. The results of the TEC analysis may be used for the selection of production technology and for the optimization of the design and operational parameters of the production installations [8][9][10]. These results can lead to the minimisation of depletion of non-renewable resources that is one of the requirements of sustainable development.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Ecological Evaluation of Nuclear Power Plant within the Whole Life Cycle

et al. 2015

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Polish energy sector is mainly based on coal combustion, which is responsible for increasing the CO2 emission. Simultaneously, European trends toward sustainability and global warming mitigation will lead to significant changes in the structure of electricity generation in Poland. Due to the domestic energy policy the increase of renewable resources utilisation, as well as installation of first nuclear power units (3x1.6 GWel), are planned in the perspective of the year 2030. The comparison of nuclear power plant with the existing coal ones requires the evaluation within the whole life cycle as well as the application of the common measure of the consumption of natural resources. Both requirements are fulfilled in the case of Thermo-Ecological Cost (TEC) analysis. TEC was introduced by Szargut and expresses the cumulative exergy consumption of non-renewable resources burdening the final consumed goods, e.g. electricity. Moreover, TEC takes into account the additional non-renewable exergy consumption required for mitigation of environmental losses caused by rejection of harmful waste products. In the paper, the TEC algorithm adopted for nuclear power plant is presented. In this case, the whole life cycle includes the following phases: 1) mining and milling, 2) conversion of fuel, 3) enrichment (diffusion or centrifuge), 4) fuel fabrication, 5) plant construction, 6) plant operations, 7) waste management, 8) plant decommissioning and 9) transport. The obtained results are compared with the average TEC index for the Polish energy mix. The direct exergy analysis shows that the direct exergetic efficiency of existing nuclear power unit is about 10% points lower than that of typical coal power unit. However, the TEC analysis proved that in the whole life cycle of the resource utilisation the exergetic efficiency is significantly lower in the case of the nuclear fuel cycle. The main cause of this imperfection appears in the stage of conversion, enrichment and nuclear fuel fabrication.

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Thermo-ecological optimization of a solar collector

Cited by 66 publications

References 2 publications

Exergy Losses in the Szewalski Binary Vapor Cycle

Exergy Losses in the Szewalski Binary Vapor Cycle

Application of multi-criteria methods to compare different solutions of supplying buildings in electricity from photovoltaic systems

Thermo-Ecological Evaluation of Nuclear Power Plant within the Whole Life Cycle

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