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‘Smart Grids’ are expected to help facilitate a better integration of distributed storage and demand response options into power systems and markets. Quantifying the associated system benefits may provide valuable design and policy insights. Yet many existing energy system models are not able to depict various critical features associated with Smart Grids in a single comprehensive framework. These...
This paper presented a systematic design and experimental results of a 190 kW e biomass fixed bed gasification and polygeneration pilot plant using a double air stage downdraft approach. Wood chips were used as feedstock that was converted through gasification polygeneration into three-phase (GSL) products, namely producer gas (gas), charcoal (solid) and extract (liquid). The pilot plant mainly...
This article analyses some design parameters on the exergetic and energetic performances for a small turbojet engine for unmanned vehicles. On the basis of theoretical data employed, some exergetic and aerothermodynamics aspects of the engine and its components are parametrically studied in terms of compressor pressure ratio (π c ) and turbine inlet temperature (T t4 ). The results...
Energy analysis results confirmed that abandoned rice fields provide a good opportunity for Japan to fulfill its E-3 target by producing ethanol from high-yield rice feedstock. However, to be a viable alternative, a biofuel should not only provide a net energy gain and reduce the emissions of polluting gases, but also be ecologically and economically competitive. Thus, an integrated ecological-economic...
The construction of an offshore demonstration wind farm was planned in a southwestern sea-area of the Korean Peninsula. To estimate economic feasibility and to establish a reliable design basis, it is necessary to identify the design parameters of the demo-farm. For a reliable estimation of the design parameters, the first offshore meteorological mast, HeMOSU (Herald of the Meteorological and Oceanographic...
In the above paper a hybrid seeker optimization algorithm and sequential quadratic programming (SOA-SQP) is proposed for solving the dynamic economic dispatch (DED) problem. The DED problem is formulated with the objective to minimize the total cost function over a dispatch period and satisfying the ramp rate constraints and other constraints. According to the optimal results for the two test systems,...
Dynamic performance of adsorption chillers (ACs) with adsorbent beds of loose grains is addressed in this paper. Temporal evolution of quasi-isobaric ad-/desorption curves for simple bed configuration of n-layers of loose grains (n = 1, 2, 4, and 8) located on a heat transfer metal support is studied. The support is subjected to fast temperature drop (50 °C → 30 °C) or jump (58 °C → 80 °C) typical...
Energy recovery has been found to be a promising approach for disposal of polymer waste such as expanded polystyrene (EPS) which entraps large volume of air. Biodiesel known as an advantageous alternative fuel possesses bio-solvent attributes and is feasible to be used for energy recovery from EPS. In this study, maximum EPS dissolution value in biodiesel was calculated and a homogenous fuel composition...
This paper presents a detailed finite-volume model of a concentrating photovoltaic/thermal (PVT) solar collector. The PVT solar collector consists in a parabolic trough concentrator and a linear triangular receiver. The bottom surfaces of the triangular receiver are equipped with triple-junction cells whereas the top surface is covered by an absorbing surface. The cooling fluid (water) flows inside...
A comprehensive thermodynamic modeling and optimization is reported of a polygeneration energy system for the simultaneous production of heating, cooling, electricity and hot water from a common energy source. This polygeneration system is composed of four major parts: gas turbine (GT) cycle, Rankine cycle, absorption cooling cycle and domestic hot water heater. A multi-objective optimization method...
This paper presents decomposition models for the change in carbon productivity, which is considered a key indicator that reflects the contributions to the control of greenhouse gases. Carbon productivity differential was used to indicate the beginning of decomposition. After integrating the differential equation and designing the Log Mean Divisia Index equations, a three-dimensional absolute decomposition...
Coal-fired thermal power plants are the major source of CO 2 emission among fossil fuel power plants. In thermal power plants, coal combustion produces flue gas containing a number of gases including hazardous pollutants, such as CO 2 , mercury (Hg), sulfur dioxide (SO 2 ), and oxides of nitrogen (NO x ). Among all, CO 2 is the largest contributor to global...
This study investigated the long run relationship between urbanization, energy consumption and carbon dioxide emission in seven regions, namely, East Asia and Pacific, East Europe and Central Asia, Latin America and the Caribbean, Middle East and North Africa, South Asia, Sub-Saharan Africa, and Western Europe. To achieve the goal of the study, the fully modified ordinary least square (FMOLS) was...
A sequential esterification and transesterification method was used successfully to convert high free fatty acid oil into biodiesel with almost 100% conversion. The esterification system was catalysed by ferric-alginate beads (0.16:1 ferric-alginate beads to lauric acid mass ratio, 15:1 methanol to lauric acid molar ratio, methanol refluxing temperature (65 °C), reaction time of 3 h) and transesterification...
Six solar-powered air-conditioners, based on four principles (LiBr + H 2 O liquid sorption, silicagel + water solid sorption, BaCl 2 + NH 3 thermochemical reaction, and desiccant + humid air open cycles) have been operated in five places (from the low-altitude Alps to a tropical island including Mediterranean Sea shore). A common experimentation procedure was applied over...
In this study, an entire simulation model is developed to investigate the influence of fast gas turbine start-up (within 20 min) on the dynamic behavior of a Benson heat recovery steam generator. The model includes a new high pressure feedwater control concept that considers a large number of live plant parameters and derivative functions. The advanced feedwater control circuit offers the possibility...
The commentary made by Jones [1], while raising some important points about CO 2 adsorption induced coal matrix swelling, is irrelevant to the methodology used in Jasinge et al. [2] article [D. Jasinge, P.G. Ranjith, Xavier Choi, J. Fernando [2012, Energy, 39, 303–309]] and this rebuttal is Jasinge et al.'s [2] response to Jones's [1] criticism. Jasinge et al. [2] paper presents a series of...
The objectives of this study are to (i) develop a reference energy system and forecast of energy consumption (EC) for a 25 year period (2011–2035) for Iran and (ii) examine the effects of several demand and supply side management strategies on resource depletion and environmental emissions. A reference energy system is developed utilizing Iran energy balance data for 2009. Bottom-up analysis is performed...
This paper examines a TMS (thermal management system) of a range-extended EV (electric vehicle), which operates on its battery before the gasoline engine engages. In this period of independence of the ICE (internal combustion engine), the vehicle performance characteristics such as range, power for acceleration, fuel economy and emissions depend solely on the battery performance. Since the magnitude...
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