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The European Union approach towards a low-carbon society in EU provides many measures. Appropriate heat load forecasting techniques offer opportunity for more effective schedule operations and cost minimization. The Company Energetika Ljubljana claims the largest district heating network in the Republic of Slovenia. Although the company has a 150-year tradition, the company has not implemented any...
Hydro-thermal unit commitment (HTUC) is an extension of unit commitment (UC) problems. The hydro-thermal unit commitment problem considered in this study aims at minimizing the total fuel cost of thermal units while satisfying the constraints of spinning reserve, minimum online/offline, ramp rate, hydraulic networks, etc. A hybrid particle swarm optimization approach with small population size (HPSO-SP)...
With China's urbanization, issues relating to emission reduction of buildings have become more prominent. Based on the latest data, we estimate total area of China's buildings, total housing area, and residential elevator stock. And also, we estimate energy consumption and carbon emission from the fossil fuel during building operation phase. Two index decomposition analysis on changes of urban residential...
Solar heating applied to rural buildings is without a doubt an interesting alternative for reducing energy consumption in cold regions. The thermal performance of transpired solar collector is enhanced by the impingement of jet. To make a better use of the jet impingement, a GTC (glazed transpired solar collector) with perforating corrugated plate is developed. A mathematical model based on the energy...
Pretreating biomass prior to pyrolysis was investigated. Three undesirable catalysts naturally present in biomass were identified: inorganics, acids, and water. A pretreatment sequence incorporating acid leaching and torrefaction was developed to reduce/remove these catalysts. Acid leaching targeted reducing the biomass's inorganic content. The acidic liquor produced during torrefaction was rich in...
The main purpose of this study is to derive a methodology for the analysis to determine the best CCHP (Combined Cooling Heat and Power) scheme in the presence of uncertainties differently from deterministic method. The proposed methodology helps decision makers see all the possible risks that impact the amortization of the system. Decisions for investments are generally taken by the conventional method,...
In this paper, we developed a detailed process model to evaluate the potential of heat generation from biomass combustion in a CFB (circulating fluidized bed) combustor by coupling Aspen Plus simulator and dedicated FORTRAN subroutines. Mass yields of permanent syngas and solid char are simulated with respect to the pyrolysis temperature by a series of experimental correlations. Particular emphasis...
A chemical or petrochemical site is generally made up of several plants that are linked together through process streams. The linking process streams are often cooled down in their source plants, then transferred into storage tanks, and reheated in destination plants. This repeatedly cooling and heating results in low energy-use efficiency and more area installed in heat exchanger network. In this...
Power crisis is a sensitive issue which can handicap activities of any country at large. In Pakistan, industries consume the majority of energy, of which 28% is the electrical energy. About 30–80% of the electrical energy consumed by industries is due to electric motors. This study aims to promote electrical energy conservation in industries of Pakistan by presenting benefits of replacing existing...
A new type of Gurney flap is applied for energy extraction enhancement of a flapping airfoil. Two-dimensional Navier-Stokes simulations at Re = 104 are conducted to study the effect of Gurney flaps with various heights. The investigations are undertaken over a wide range of kinematic parameters (reduced frequency k, pitching amplitude θ0). Numerical results show that the application of a Gurney flap...
The emerging technology, transactive energy network, can allow multiple interconnected micro-grids (a.k.a. micro-grid clusters) to exchange energy for greater energy efficiency. Existing research has demonstrated that the micro-grid clusters can achieve some collective interests (e.g., minimizing total energy cost). However, some micro-grids may have to make sacrifices of their individual interests...
Pulsating heat pipe (PHP) is a relatively new and promising addition to the family of passive two-phase energy transport devices. By charging with water-methanol, water-ethanol and water-acetone zeotropic mixtures at various volume mixing ratios, a vertical closed-loop PHP has been experimentally investigated with heat input ranged from 10 W to 100 W. It was found that because of the zeotropic properties...
Low methane content landfill gas is not suitable for feeding engines and is generally flared. This type of landfill gas may be enriched by removing the inert carbon dioxide. An innovative process, based on the carbon dioxide captured by means of accelerated carbonation of bottom ash was proposed and studied for the above purpose. The process was investigated at a laboratory scale, simulating different...
Offshore wind technology is rapidly developing and a wind farm can be integrated with offshore power stations. This paper considers as case study a futuristic platform powered by a wind farm and three combined cycle units consisting of a gas turbine and an ORC (organic Rankine cycle) module. The first aim of this paper is to identify the maximum amount of wind power that can be integrated into the...
High penetration of wind power generation and deregulated electricity market brings a great challenge to the electricity system operators. It is crucial to make optimal strategy among various generation units and spinning reserve for supporting the system safety operation. By integrating interval two-stage programming and stochastic robust programming, this paper proposes a novel robust model for...
This study presents a generic methodology to select working fluids for ORC (Organic Rankine Cycles) taking into account property uncertainties of the working fluids. A Monte Carlo procedure is described as a tool to propagate the influence of the input uncertainty of the fluid parameters on the ORC model output, and provides the 95%-confidence interval of the net power output with respect to the fluid...
LDCH (Liquid desiccant-vapor compression hybrid) air-conditioning systems are popular for reducing energy consumption. This work tests a conventional LDCH air-conditioning experimental setup and establishes the corresponding mathematical model to analyze the effect of the concentrated solution branch in the SSHE (solution–solution heat exchanger) on the cooling capacity of the evaporator; the results...
Understanding the impacts of CV&C2 (climate variability and change) on electricity systems is paramount for operators preparing for weather-related disruptions, policymakers deciding on future directions of energy policies and European decision makers shaping research programs. This study conducted a systematic literature review to collate consistent patterns of impacts of CV&C on electricity...
To avoid the coincidence between the tower nature frequency and rotational excitation frequency, a SEZ (speed exclusion zone) must be built for a two-blade wind turbine with a full rated converter. According to the literature, two methods of SEZ-crossing could be adopted. However, none of them have been studied in industrial applications, and their performance remains unclear. Moreover, strategies...
The characteristics of repetitive extinction-ignition dynamics of flames are investigated numerically for hydrogen-air mixtures in a heated micro channel. A Low Mach number formulation, detailed chemical kinetics and different molecular diffusivities for each species are utilized in all simulations. In this regard, the effects of inlet velocity, equivalence ratio, and channel width on amplitude and...
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