The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In the present work, a novel combined power and ejector refrigeration cycle is proposed by an appropriate combination of a Kalina cycle (KC) and an ejector refrigeration cycle (ERC) to produce power output and cooling output, simultaneously. The exhaust of the turbine is fed to the ejector as a primary flow to draw the secondary flow into the ejector. Energy, exergy, and exergoeconomic analysis of...
With increasing concern for energy savings in universities, operational solutions, such as control strategies and occupant interventions, have been recommended to reduce energy use, due to the limited responsibilities of faculties and students for energy saving. Additionally, the energy-efficient allocation of classrooms can contribute to achieving further energy saving, because they have different...
As to the fuel injection system of electronic unit pump, of which fuel supply principles mainly be influenced by fuel supply camshaft. Due to the requirements of the diesel engine for the fuel supply system, a new method is presented to design the constant pressure injection fuel supply cam profile. First, design principles of the fuel supply camshaft profile according to the diesel engine combustion...
This study establishes an implicit constrained global optimization approach for electric vehicles with in-wheel motors. Limited wheel space and specified vehicle performance make the traditional global optimization algorithms ineffective. An innovative optimization approach is proposed to provide a full understanding of the design space and to find the optimal implicit constrained global solution...
This paper proposes a bi-objective optimization model for optimal siting and sizing of an energy storage system (ESS) in a microgrid in the presence of demand response program (DRP). The proposed bi-objective optimization model includes two different objective functions: 1) minimization of total investment cost as well as operation cost 2) minimization of loss of load expectation (LOLE). In order...
In this study oleaginous yeast, Rhodosporidium kratochvilovae HIMPA1 grown in glucose synthetic medium containing different nitrogen (1 g/l and 0.1 g/l) and phosphorus (0.05 g/l and 0.1 g/l) limited conditions. Among various N and P-limited conditions, the highest lipid content (60.34± 0.69%) obtained under synchronized limitation of N and P (0.1 g/l N and 0.05 g/l P). Live fluorescent cell imaging...
The importance of renewable energy usage is increasing gradually due to the reasons of energy supplying security, environmental pollution and reducing dependency on external sources in all over the world as also same in Turkey. Biomass is a clean and sustainable energy source that can be produced from various kind of organic waste. Turkey has considerable biomass energy potential, and about 6% of...
By using a multi-dimensional computational fluid dynamics (CFD) code, the combustion process of a heavy-duty diesel engine with low temperature combustion (LTC) at different loads was investigated. Based on the optimization results, the potential of the late intake valve closing (LIVC) strategy coupled with boosted intake pressure, as well as the influence of fuel injection timing and exhaust gas...
Among the regulatory policies, feed-in tariffs (FIT) and renewable portfolio standards (RPS) are the most popular to promote the development of renewable energy power industry. This paper uses system dynamics (SD) to establish models of long-term development of China's biomass power industry under FIT and RPS schemes, and provides a case study by using scenario analysis method. The model, on the one...
Niobrara shale cubes of 20 cm from Colorado were employed to investigate gas and supercritical CO2 injection-induced fracturing in naturally fractured caprocks of deep aquifers/depleted reservoirs and fractured shale reservoirs. Under tri-axial stresses, gas or supercritical CO2 was injected into the center of the cubes to induce fracturing. Real-time pressure and temperature, acoustic wave, pressure...
This paper presents the design and experimental testing of a dual-axis photovoltaic tracking system. The production and presentation of the tracking system are divided into the mechanical and electrical parts. The primary focus of the work is to present the accuracy of the open-loop control system (photo sensors) for tracking the trajectory of the Sun, which has been implemented and tested on a dual-axis...
The increasing demand on energy due to population growth and rise of living standards has led to considerable use of fossil fuels which cause environmental pollution and depletion of fossil fuels. Biodiesel proves to be a good alternative for fossil fuels. But sustainability of biodiesel is the key factor for determining it as a fuel in diesel engines. It needs identification of proper blend of biodiesel...
NG (Natural gas) distribution pressure varies in a wide range in different applications and has significant effect on system exergy efficiency. RC (Rankine cycle) and DEC (direct expansion cycle) can utilize the cold and pressure exergies of LNG (liquefied natural gas), respectively. In this paper, SRC (single-stage RC), PTRC (parallel two-stage RC) and CTRC (cascade two-stage RC) with and without...
Using renewable resources to generate electricity is becoming increasingly common all over the world. As the largest energy consumer in the world, China has established many biomass direct-fired power plants in recent years. However, most of these power plants would not survive without government subsidies because of the high cost of fuel. This study focuses on the fuel supply chain of biomass direct-fired...
In this work, we address the optimal design of an integrated microalgae-based biorefinery through the formulation of a mixed integer nonlinear programming model for the production of biodiesel and potential high-added value products. Main bioproducts are poly (hydroxybutyrate) (PHB) and astaxanthin. A combined heat and power cycle to transform biogas generated by the anaerobic digestion of waste streams...
Liquid desiccant dehumidification systems are widely used in many industries including HVAC. Special attention has been paid to the liquid desiccant air conditioning (LDAC) system performance analyses. However, the studies, such as factor analysis and performance optimization of LDAC system, have not received enough attention. This paper focuses on the factor analysis and optimization of the operational...
Oil price shocks continue to provide surprises, even with known driving factors. Unlike previous studies limited in original holistic time horizons, we examine impacts of oil supply and demand, the world economy, oil stocks, the futures market and the political stability in the Middle East on oil price fluctuations in multiple time horizons; the original time horizon serves as a comparison. We find...
Micro Direct Methanol Fuel Cell (μDMFC) has been a promising new type of portable energy device due to its high energy density, quick start features and simple operation environment. Water management is one of the most crucial problems for hindering the development of passive μDMFC. A novel cathode structure of passive μDMFC controlling water management and increasing methanol concentration is proposed...
This paper studies the power capture performance of solo Duck wave energy converter (WEC) arrays. The barrier function method combined with a quasi-Newton BFGS optimization algorithm is applied to find the maximum captured power of the array when the Ducks are under motion constraints. Based on this optimized maximum captured power, the effects of separation distance, wave period, incident wave direction...
This paper presents the set-up, the validation and the application of a two-phase incompressible three-dimensional Computational Fluid Dynamic (CFD) model for an extensive parameter study on the performance of a fixed, detached Oscillating Water Column (OWC) wave energy converter. The numerical study aims to assess the combined effect of relevant design parameters (chamber length, front wall draught,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.