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Modeling thermoelectric generator (TEG) performances plays an important role in guiding the design of TEGs to achieve better efficiency. However, a rigorous 1-D TEG modeling performance has not yet been conducted, which prevents reliable prediction of TEG performance. In this work, a detailed 1-D model has been developed to take into account temperature-dependent thermoelectric material properties,...
Energy system contains multiple uncertainties, and it is hard to express all its uncertainties by only one method. In order to solve this problem, an interval-fuzzy possibilistic programming (IFPP) method was developed based on the interval parameter programming (IPP), the fuzzy possibilistic programming (FPP) and fuzzy expected value equation within a general optimization framework. In this model,...
CO2-based enhanced geothermal systems (EGS) are being widely studied due to great heat extraction and additional CO2 sequestration. However, the existing studies ignored surrounding formation permeability and approximately calculated CO2 sequestration based on flow tests of water-based EGS. In this paper, heat extraction and CO2 sequestration in a CO2-based EGS were simulated simultaneously based...
The rising concern about environmental impacts of fossil fuels has forced supply chains to focus more on environmentally sustainable energy sources. Solar is one of the most promising alternative sources of energy that is widely available and environment friendly. In this respect, this paper develops a two-phase approach based on data envelopment analysis and robust optimization models to design and...
Hydraulic fracturing is often conducted to create artificial fractures as flow paths in Hot Dry Rock (HDR) geothermal reservoirs. However, the fractures could be closed due to the high geo-stress conditions, resulting in low efficiency of geothermal productivity. Hence, maintaining a high hydraulic permeability of the created fractures is a key point for the success of Enhanced Geothermal Systems...
With increasing penetration of renewable energy sources, it is necessary to analyze its impact on the allocation of optimal power generation schedule. In this work, the pumped storage hydrothermal (PSHT) system incorporating solar units has been undertaken. The novel integrated heuristic approach named as time varying acceleration coefficient particle swarm optimization with mutation strategies (TVAC-PSO-MS)...
The paper presents a thermodynamic analysis of selected CAES and LAES systems. The LAES cycle is a combination of an air liquefaction cycle and a gas turbine power generation cycle. CAES and LAES systems are simulated using Aspen HYSYS software. CAES is modeled in a dynamic mode. A comprehensive thermodynamic analysis was conducted along with the comparison of storage volumes. The results indicate...
The solar/autothermal hybrid gasifier (SAHG) is an attractive approach to provide continuous production of the syngas via coupling autothermal and solar gasification together, where the SAHG mainly includes fully solar, hybrid, and fully autothermal modes. An ICE CCHP system driven by the SAHG with an indirectly irradiative two-cavity reactor introduced conceptually and investigated thermodynamically...
This is the first article presenting the detection of discrete and stratified nature of fringes in the lignin-related segment of the activation energy profile of a biomaterial. The torrefied biomaterial made from the cotton stalk was evaluated for intrinsic physico-chemical transformations in comparison with the raw cotton stalk. The intrinsic hemicellulose and cellulose components disappeared due...
Nowadays, severe uncertainty of electricity market price is a challenge issue in power systems that market players are faced. As one of market players, merchant compressed air energy storage system can be studied to investigate how energy is purchased/sold in the presence of electricity market price uncertainty. Therefore, this paper proposes, robust optimization approach is employed to achieve the...
With the non-advanced portion of the US Renewable Fuel Standard having been largely met by corn ethanol, many states are looking to cellulosic crops as the next source of biofuels. In Indiana, attention is turning to biojet fuels and renewable diesel as forming the demand for these crops. This paper seeks to determine the optimal manufacturing site locations and supply chain logistics for the conversion...
Single layer feed-forward network (SLFN) is well applied to find mapping relationships between the input data and the output data. However, the SLFN has two obvious shortcomings of the indetermination structure and parameters. Therefore, this paper proposes a novel self-organizing cosine similarity learning network (SO-CSLN), which can obtain a stable structure and suitable parameters. The hidden...
Supercritical water gasification (SCWG) is a promising clean coal technology. A new power generation system with integrated supercritical water gasification of coal andCO2 capture is proposed in this article. The gasification product consisted of H2, CO, CO2, CH4, and unreacted supercritical water is directly combusted with pure O2to provide heat for other units of the system, and the combustion product...
Vertical axis wind turbines like Darrieus turbines are very interesting type of wind turbines at domestic zones which have low wind speed, but this type has a low performance compared quantitatively to horizontal axis wind turbines. Further research work is needed to increase its performance to match the higher demand of the power generation in small-scale applications. The main target of the current...
Here, we report on the first ever study of an innovative kind of cement composite incorporated with n-octadecane (OC)/diatomite shape-stabilized composite phase change material (PCM). Diatomite decorated with carbon nanoparticles and calcined at 800 °C for 3 h (DC) was considered as the optimum supporting matrix due to its hierarchical porous microstructure and attractive crystallization character...
Assessment of the climate-related impacts on energy systems usually implies regression approaches. That restricts generalization of the published results for the regions which are not covered with detailed research yet. The climate change impacts on the Russian power industry were for the first time quantified in a systematic way. A robust physically-based simulation approach was used to simulate...
Little is known about the effects of using emulsion fuel for extended operation hours. Emulsion fuels comprise of water, low grade diesel fuel (D2) and surfactant in the ratio of 10:89:1 v/v% (E10) and 20:79:1 v/v% (E20). The characteristics of carbon deposits from an engine after a run of 200 h were examined. The carbon deposit analysis performed were macroscopic/microscopic photographs, thermogravimetric...
The heating energy consumption per floor area (HECPA) and heating degree days (HDD) are effective indicators in quantifying the energy demand for heating with climate change. Using the heating energy consumption and meteorological data, an attempt has been made to analyse the relationship between the HECPA and HDD in different regions of northern China by the linear regression model. Based on the...
The paper presents the validation of a 1D compressor model (1DCM) applied to the simulation of deep-surge operation. The compressor is described following an enhanced map-based approach, where proper "virtual pipes" are placed upstream and downstream the compressor to deal with the mass and energy storage and wave propagation effects. The proposed methodology, which takes into account main...
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