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The subject of this paper is analysis of the cooling system of a conceptual advanced ultra-supercritical coal-fired power unit integrated with a CO2 capture and compression unit (CCU). The capture unit, based on wet chemical absorption using MEA (monoethanolamine), was modelled in Aspen PLUS. The obtained results were used in the power unit model developed in Ebsilon Professional. The aim of the calculations...
A great amount of researches on thermodynamic cycles have been active in recent years, such as ORC (organic Rankine cycle), Kalina cycle, et al. However, the ultimate aim of such researches, which could even be traced back to more than one century ago, has not changed with a tireless pursuing to Carnot cycle. In exiting researches, the working fluid, as a medium for energy conversion, is commonly...
Fast pyrolysis of lignocellulosic biomass constitutes a promising technology to reduce dependence on fossil fuels. The product, pyrolysis liquids, can either substitute heavy fuel oil directly, or be upgraded via e.g. hydroprocessing to diesel and petrol. This study presents a systematic evaluation of production costs and CO2 mitigation potentials of different fast pyrolysis value chain configurations...
A bipolar passive direct methanol fuel cell (DMFC) stack for portable applications is designed, fabricated and tested. Stainless steel sheet is chosen to fabricate the current collectors by using the traditional wire cutting and laser beam cutting techniques. A 3.5 μm Au layer is deposited on the current collectors using electroplating method to prevent electrochemical corrosion. A novel design of...
Fast cut back (FCB) technology of thermal power plant can restore electricity supply quickly after electric grid fault is repaired. In order to optimize the control technology for FCB, it is necessary to establish an accurate and simple mathematical model for thermal power plant. In this work, a mathematical model of coal-fired boiler-turbine is built up, basing on the balance laws of mass and energy...
Two different arrangements of a system including a cogeneration plant based on solid oxide fuel cell with internal reforming (IR-SOFC) and solid oxide fuel cell with external reforming (ER-SOFC) for producing power and hot water are modeled and analyzed thermodynamically. Also, in order to determine the optimal values of design parameters including SOFC inlet temperature, current density, steam-to-carbon...
During the cooling season, the beneficial effects of cool colors and cool paints are multiple and undebatable. Really, it is not well-know their impact during the heating season, when a heated external surface could be useful in order to reduce the heat losses.This paper, by means of experiments and numerical simulations, investigates the effect of high-reflective and high-emissive coatings on the...
Combined heat and power (CHP) plants are a great improvement over waste-to-energy incineration plants supplying only heat, and power plants supplying only electricity. The primary purpose of a functioning CHP plant however, may be to provide district heating services, and thereby its main output will be heat energy. This paper is a case study commissioned by Karlskoga Energi och Miljö AB (KEMAB in...
Numerical simulations were performed to assess the relationship between carbon monoxide (CO) and formaldehyde and unburned methanol-unregulated emissions in cylinders and a tailpipe with ozone (O3) addition from a direct-injection spark-ignition methanol engine. This simulation study was performed during cold-start and steady-state modes with O3 addition of 3000 and 7000 ppm. The initial phase of...
The operating parameters of task/ambient air conditioning (TAC) systems including supply air temperature (ts) and air flow rate (Qs) were reported to have critical effects on energy savings and thermally comfortable environment. Due to the existing contradictions between these two aspects, a multi-objective study should be carried out to realize consuming minimum energy and at the same time to guarantee...
The advancement in hydraulic turbine (HT) technology was exploited for energy and cost benefits in natural gas liquefaction. Replacing the conventional Joule–Thompson (JT) valve with HT has the potential to recover the work input. This research investigated the effect of replacing the JT valve with HT in the energy efficiency enhancement of a single mixed refrigerant (SMR) process. To fully take the...
Energy consumption for hot water production is a major draw in high efficiency buildings. Optimizing this has typically been approached from a thermodynamics perspective, decoupled from occupant influence. Furthermore, optimization usually presupposes existence of a detailed dynamics model for the hot water system. These assumptions lead to suboptimal energy efficiency in the real world. In this paper,...
A novel solar grading collector/regenerator system with heat recovery is proposed in this paper and a mathematical model of system is established. Numerical simulation shows that heat recovery does increase the performance of system reaching increments of 104% and 320% respectively for grading solar collector/regenerator with all heat recovery (Mode E) and single solar collector/regenerator with heat...
The aim of this numerical investigation is to analyze the performance of a building integrated photovoltaic/thermal (BIPV/T) system from exergoeconomic and enviroeconomic points of view for Kermanshah, Iran climatic condition. In the proposed system, the cooling potential of supply air and exhaust air is used for cooling the PV panels as well as heating the supply air by heat rejection of the panels...
An amorphous structure of BiInGaTe powders with a small size of 10–45 μm and a low melting point of 93.2 °C is fabricated using a gas atomization technique. It is patterned using a roll-to-plate printer and then reflowed at 110 °C to become thin Bi2Te3In2Te3Ga2Te3 thermoelectric film on a flexible polyethylene terephthalate (PET) substrate. Subsequently, the electrical conductivity of the Bi2Te3In...
The properties of biodiesel differ depending on feedstock fatty acid content. Moreover, biodiesel fatty acid composition influences the combustion process. For these reasons, noise emissions of a direct injection Perkins diesel engine fueled with olive pomace oil methyl ester (monounsaturated methyl esters) and palm oil methyl ester (saturated methyl esters) were studied under several steady-state...
High technology energy systems have generated a lot of interest due to their significant contribution to efficient and environmentally friendly energy production. Among them there are hybrid cycles which usually have higher energy efficiencies and can provide different forms of energy at the same time. The present research poses a question concerning thermodynamic performance of a molten carbonate...
Forecasting petroleum consumption is a complicated and challenging task because many parameters affect the oil consumption. Whereas a highly accurate prediction model can help one utilize data resources reasonably, an inaccurate model will lead to a waste of resources. Thus, choosing an optimization model with the best forecasting accuracy is not only a challenging task but also a remarkable problem...
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