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Dedicated energy crop production is seen as a path to develop local biomass sources for consumer heating needs. Nevertheless, one drawback of the novel energy crops is a more complex composition than stemwood sources been generally described as “problematic” fuels. Consequently, conversion technology should be adapted to manage their combustion characteristics. The main objective of this work was...
In this paper, Computational Fluid Dynamics (CFD) technique is used to investigate the adaption of adjustable ejector for variable cooling loads and the characteristics of ejector pressure recovery in a multi-evaporator refrigeration system (EMERS) using R134a as the refrigerant. The performance of pressure recovery reflects the performance of the compression energy saving. The developed CFD model...
Encouraging consumers to use less electricity through information is essential for sustainable use of energy and demand response is indeed a key component of the smart grids concept. The aim with this study is to understand differences between consumer categories and what this could mean e.g. to develop effective demand response measures. In-depth analyses of answers from a questionnaire sent out...
Wind energy is a fluctuating resource which can diverge quickly and causes the frequency deviation. To overcome this problem, the current paper deals with a frequency control scheme for a small power system by a coordinated control strategy of a wind turbine generator (WTG) and a battery energy storage system (BESS). The small power system composes of a wind turbine, a battery storage and a diesel...
We assess the feasibility of hybrid solar-biomass power plants for use in India in various applications including tri-generation, electricity generation and process heat. To cover this breadth of scenarios we analyse, with the help of simulation models, case studies with peak thermal capacities ranging from 2 to 10 MW. Evaluations are made against technical, financial and environmental criteria. Suitable...
A recyclable and reusable Ru/Al 2 O 3 catalyst is prepared for hydrogen generation from the hydrolysis process of alkaline sodium borohydride (NaBH 4 ) solution. The hydrogen generation rate by the hydrolysis and methanolysis of alkaline NaBH 4 was explored as a function of NaOH concentration. Meantime, the byproducts derived from the spent alkaline NaBH 4 solution...
A dynamic model of a regional energy system has been developed to support sustainable waste treatment with greenhouse gases (GHG) mitigation, addressing the possibility for development towards a regional fossil fuel-free society between 2011 and 2030. The model is based on conventional mixed integer linear programming (MILP) techniques to minimize the total cost of regional energy systems. The CO...
In this work, standard diesel, neat biodiesel, biodiesel(85%)-methanol(15%) (B85M15) and biodiesel(85%)-ethanol(15%) (B85E15) fuels are tested. Experiments are carried out using a two-cylinder, 4-cycle, direct injected, water-cooled diesel engine at five loads between no load and a full load of 3000 rpm. Performance and emission characteristics of the engine fueled with biodiesel-ethanol and biodiesel-methanol...
Direct numerical simulation (DNS) is used to study spray combustion in a slab layer configuration. The gas phase is simulated in an Eulerian way, while the droplets are tracked with a Lagrangian method. The coupling between the two phases is considered. A fourth-order explicit Runge–Kutta method for time integration and an eighth-order central differencing scheme for spatial discretization are used...
This paper presents the relationships for the heat transfer performance of two-stream heat exchangers (THEs) and two-stream heat exchanger networks (THENs) with the entropy generation, the entropy generation number, the revised entropy generation number, the entransy dissipation, the entransy dissipation number and the entransy-dissipation-based (EDB) thermal resistance. The results indicate that...
Microcapsules containing n-octadecane with different methylmethacrylate (MMA (methyl methacrylate))-based copolymer shells were fabricated by a suspension-like polymerization. Butyl acrylate (BA), butyl methacrylate (BMA), lauryl methacrylate (LMA) and stearyl methacrylate (SMA) were employed as monomers to copolymerize with MMA. Pentaerythritol tetraacrylate (PETRA) was employed as a crosslinking...
This paper presents a discussion of “A novel meta-heuristic optimization methodology for solving various types of economic dispatch problem” Fesanghary et al. “Energy” 34 (2009) 757–766. The discussed paper presented economic dispatch problem by experimenting with six case studies considering 38, 13, 15, 6, and 10-unit test systems along with multi area economic dispatch (MAED) problem. However, in...
This study examines the factors that affect fuelwood consumption in cookstoves and estimates fuelwood consumption associated with the use of cookstoves in a rural isolated West African village with a population of 770. Five primary applications of cookstoves were identified: cooking meals, heating water for washing, roasting peanuts, making medicine, and steeping tea. Six factors were identified that...
A new combined power and desalination system is proposed. This system is driven by low grade heat sources such as solar energy, geothermal or waste heat. This system combines a supercritical organic Rankine cycle (SORC), an ejector and a multi-effect distillation (MED) desalination system, which could be used for seawater or concentrated brine such as frac flowback water produced during natural gas...
To improve the forecasting accuracy of crude oil price with deeper understanding of the market microstructure, this paper proposes a wavelet decomposed ensemble model. The proposed model follows the Heterogeneous Market Hypothesis that assumes the unstationarity and dynamic changing nature of the underlying market structure and introduces the wavelet analysis to analyze the dynamic underlying Data...
Cogeneration involves the production of both electricity and thermal energy generally in the form of steam or hot water, and it has a great potential of saving primary energy in comparison to separate generation technologies. The use of cogeneration provides high energy conversion efficiency, and it also lowers the emissions released to the environment. Exergy analysis is an effective tool which provides...
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