The current economic development is based on high input and high consumption, which is contrary to the current green development concept. Improving energy economic efficiency is a powerful way to balance economic development and energy consumption. This paper focuses on estimation of energy economic efficiency of Yangtze River Urban Agglomeration (YRUA). The Slack-Based Model (SBM) was used to estimate

This paper aims to select the best hybrid renewable energy system (HRES) using a new multi-criteria decision-making model for supplying the power consumption of a government institution. The model considers social, environmental, technical, and economic criteria for providing a clear overview of the most suitable HRES design configurations. The proposed model has been implemented in two scenarios related

This work aims to investigate the operation characteristics of an organic Rankine cycle (ORC) system under the variable mass flow rate of the working fluid (ṁwf), such as the flow excursion in the field of direct vapor generation (DVG) systems. Besides, the mass flow rate of cooling source (ṁcs) was verified as an effective manipulated variable to respond the variation of ṁwf, which was an easily

In this study, a novel organic fluid-filled regenerative heat exchanger used heat recovery ventilation (OHeX-HRV) system was designed. Five organic-based fluids (R11, R123, R245fa, n-Pentane and Isopentane) were selected by considering operating conditions. Indoor air exit temperature, outdoor air inlet temperature and recovered heat by regenerative heat exchanger were analysed depending on varying

In this study, Solar Thermoelectric Generator Assisted Water Pump (STEGWP) for agricultural irrigation systems has been proposed and analyzed. A single module solar thermoelectric generator cell (STEGC) with average solar radiation value of Turkey was designed, and its electrical parameters were calculated in the laboratory environment. By using a tar-coated, heat-absorbing copper plate with a radiation

For the first time, ejector technology has been integrated with the adsorption technology in a single cycle to increase productivity of desalinated water. In this paper an innovative idea of allocating an ejector before the condenser of an adsorption water desalination system is presented. This work lays down the basic rules for using ejector technology along with the adsorption technology. The innovative

This study implemented the performance assessment and techno-economic optimization of residential ground source heat pump (GSHP). First, a detailed numerical model integrating the ground heat exchanger and heat pump and economic model considering economic indicators were developed to analyze the thermal and economic efficiency of residential GSHP. Then, Taguchi method was proposed to investigate the

For gaining both the maximum profit and the minimum exergy loss, a novel arranged gas engine combined heating and power system is proposed. This system was modeled in four aspects of energy, exergy, economic and environmental. By defining two objective functions including percentage of exergy destruction to the total inlet exergy and relative annual benefit, Genetic Algorithm was used for system multi-objective

Flat-plate solar collectors are one of the cleanest and most efficient heating systems available. This experimental study explores the effect of replacing water with surfactant-free rutile TiO2–water nanofluids as the working fluid in a symmetric flat-plate solar collector. The efficiency of the collector was investigated in Aghajari, a city in the south of Iran. Analysis was performed according to

Environmental conditions have a strong influence on the behavior and quality of the generated photovoltaic (PV) power. The partial sharing condition is a natural phenomenon that reduces the lifetime of the PV array and the effectiveness of the entire system. Dispersing the shadow equally over PV panels is the solution to avoid the negative impact of the partial shading condition. Accordingly, PV array

This paper aims to study the order reduction and dynamic performance of hydropower system with surge tank (HSST) for grid-connected operation. Firstly, for the hydropower system, the basic equations are presented, and the overall transfer function is derived. Then, a novel order reduction method for high order dynamic system is proposed to study the dynamic performance. The low order equivalent systems

To supply continuous and reliable power to the water monitoring systems and motorized control valves in urban water supply networks, the inline cross-flow turbine has been developed. This study aims to investigate the effects of different runner geometries on the performance of inline cross-flow turbines and to determine the optimal runner geometrical parameters. In this paper, a theoretical analysis

A key solution to imminent energy shortage and the protection of environment is to use much more of renewable resources of energy. There are various renewable resources of energy and choosing the most appropriate alternative is a complex task that involves several decision factors with different weights. Although nearly all decisions to be made by decision makers (DMs) in energy sector are subject

In this study, the thermal performance of solar air heater (SAH) has been predicted using artificial neural network (ANN) with relevant input parameters. To complete this aim, two different types of SAHs were developed using roughened (arc shaped wire rib) and smooth duct. Many researchers have been used system parameters, operating parameters and meteorological parameters to predict the performance

Methods for supporting the bidding processes of hybrid wind-photovoltaic (W-PV) farms are scarce, especially when numerous goals are included in the optimization problem. Therefore, the primary objective of this study is to develop a novel model that can help bidding of W-PV farms considering a range of objectives that maximize the environmental and welfare benefits. This new approach contributes to

In this paper, a geothermal energy extraction system has been designed based on a two-phase closed thermosiphon, cascade phase change material heat exchanger, and an organic Rankin cycle. The proposed system is thermodynamically analyzed for supplying power and heat to a selected hotel in Sarein city in Iran. In the first step, the optimum diameter of the two-phase closed thermosiphon, according to

Butanol and hydrogen both have unique thermodynamic properties and their combustion reactivity might be significant to energy sustainability. This work examined the effects of n-butanol-hydrogen-gasoline blends on turbocharged gasoline direct injection (TGDI) engine performance, combustion and gaseous emissions at different spark timing (ST), brake mean effective pressure (BMEP) and loads. Experiments

This study presents a new strategy using cluster analysis, multivariate adaptive regression splines and conditional inference trees to benchmark and evaluate building electricity usage. Different from the existing studies, cluster analysis was first used to group buildings based on their annual electricity usage patterns in order to improve the accuracy of the benchmarking result. Multivariate adaptive

The energy and cost saving of flat plate collector using Al2O3/water nanofluids and with wire coil with core rod inserts were studied experimentally. The experiments were conducted for various particle loadings of nanofluid (0.1%, 0.2% and 0.3%) and nanofluid with various p/d values of wire coil with core-rod inserts (p/d = 1.79, 2.54 and 3.24). The potential increase of collector efficiency is converted

Water wheels are hydropower converters installed in sites with heads typically below 6 m. Due to their low environmental impacts and costs, water wheels are sustainable technologies. The estimation of their weight is essential to quantify construction and transportation costs, and the load on the ground. The weight estimation of a water wheel is the aim of the present study. A short-cut equation, relating

In this work, global solar radiation is estimated based on sunshine duration. Solar radiation measurements have been collected from the Indian Meteorological Department (Pune, India) for the period 1986–2000. 25 model forms were selected from the literature which correlates the clearness index with sunshine duration. The coefficients of models are extracted from the data. k-fold cross-validation is

This paper presents a novel hybrid solar cooling system driven by a concentrated photovoltaic/thermal unit (CPV/T). The electricity of the PV module is used to power the thermoelectric cooler while the thermal energy is used to run an absorption cooler. The effective cooling of the PV module provides more electricity, but less thermal energy quality (temperature). Thus, there is more cooling effect

Traditional algorithms, such as Perturb and Observe (P&O), Incremental Conductance (IC), Beta and others, have commonly been used to perform the maximum power point tracking (MPPT) in photovoltaic (PV) system. On the other hand, the overall system performance can be largely impaired when PV systems are subjected to partial shading conditions, once, usually, traditional algorithms operate at the local

The techno-economic performance of two different CSP technologies i.e. Solar tower (ST) and parabolic trough (PT) were evaluated in this paper, each at two different locations in Ghana (Navrongo and Tamale) using the System Advisor Model (SAM) software. From the simulated results, levelized cost of energy (LCOE) of 13.67 ¢/kWh and 14.73 ¢/kWh were recorded for the ST modelled at Navrongo and Tamale

Accurate wind speed forecasting is beneficial to the management of the wind power system. A hybrid WPD-DA-NAR wind speed forecasting model under moving window framework is proposed in this study. The WPD (Wavelet Packet Decomposition) is utilized to process the original wind speed time series. Since the mother wavelet function is the core component of the WPD, the matching relationship between the

In the current study, a domestic diesel electricity generator based new thermoelectric cogeneration system is studied with a 20% blend of mahua biodiesel fuel. The exhaust of the engine is considered as the heat source with the rectangular configuration geometry of the exhaust pipe, for heating water and producing electricity using thermoelectric generators. A thermal resistance model is developed

In this paper, a fuzzy logic based Mandani-type controller is applied to an industrial frequency converter to couple a photovoltaic generator to a conventional centrifugal pump for water pumping applications. The system operates in closed loop and the DC bus voltage regulation of the frequency converter is done indirectly by varying the speed of the pump according to the power provided by the photovoltaic

This paper presents a case study of the Penghu bus transportation system wherein all the diesel buses were considered for replacement with battery-swapping e-buses. A genetic algorithm was employed to optimize the battery charging and discharging capacity at different time points during the timeframe, thereby minimizing the total single-day cost of the bus system. Demand response was used to adjust

In the present study, optical and thermal modelling is applied with the aim to contribute to the identification of the proper form of the overall performance equation of Parabolic Trough Collectors (PTC). Numerical experiments are performed for a range of operational parameter values that refer to medium temperatures. The computational data are used for assessing the capability of existing and new

Low-cost and efficient electro-catalysts can play a key role in electro-catalytic water oxidation reaction. Hereinto, highly stable semiconducting nickel oxide (NiO) nanoparticles were synthesized by a facile, biomimetic and cost effective one pot synthesis route. Nickel (II) acetate tetrahydrate was used as a precursor and medicinal plant Olea ferruginea Royle as a reducing agent. The biosynthesized

Ghana has been facing cyclical erratic power supply in recent years due to increasing population, urbanization and industrialization. The country’s electricity generation is hugely dependent on fossil fuels which makes the cost of electricity generation susceptible to cost of fuel on the international market and other economic factors such as exchange rate, despite the country’s huge renewable energy

The combination of solar dishes and Stirling engines is a promising and reliable technology to convert solar radiation into power which can minimize fossil fuel consumption for electricity generation. The current research intends to explore solar dish/Stirling engine system functionality under different operating conditions and climates. A numerical routine has been developed and adopted to TRNSYS©

A reliable model for photovoltaic (PV) cell/panel is of great interest; it helps to simulate and better understand the behavior of PV systems. Consequently, better control and optimization of the system can be achieved. The most used models of PV cell/panel in literature are the one-diode (ODM) and double-diode (DDM) models. Their accuracy strongly depends on their parameters which must be obtained

In this paper, the day-ahead scheduling problem of a smart microgrid (SMG) is modeled as a multi-objective function consisting of: i) minimizing the operation cost and the emission pollution in generation side ii) minimizing the load curtailment cost with the strategic conversion of curtailable loads (CLs) and iii) coordinating of shiftable loads (SLs) and the output power of wind turbines (WTs). The

In this research, a novel integration is presented to develop a hydrogen-based strategy solution for 600 kW electrical power production. The proposed system consists of solid oxide fuel cell (SOFC), gas turbine, organic Rankine cycle (as the Waste-to-Energy technology), and a proton exchange membrane (PEME). PEME utilizing as a hydrogen production unit in order to cover a portion of SOFC fuel consumption

Recently, an increasing number of studies have proposed various methods for predicting wind speed to overcome the difficulties caused by the irregularity and randomness of raw data in exploring renewable wind power generation. The lack of both effective data preprocessing techniques and combined forecasting strategies has hindered the development of effective and reliable forecasting systems. In this

Due to increasing concerns about global warming, greenhouse gas emissions, and the depletion of fossil fuels, electric vehicles (EVs) powered by lithium-ion batteries have been placed on the forefront as alternative vehicles. Although lithium-ion battery has noticeable features, including high energy and power density, its highly nonlinear and dynamic nature needs to be continuously monitored by an

This paper explores passive flow control via leading-edge (LE) slats to reduce the dynamic stall (DS) phenomenon and related blade-wake interaction in an H-Darrieus type vertical axis wind turbine (VAWT) operating under low wind speed conditions. A comprehensive 2D unsteady computational fluid dynamics (CFD) assessment has been carried out for the non-slatted baseline rotor and the advance slatted

This study proposes a new configuration for synthesizing clean ammonia using clean hydrogen produced by the renewables. The proposed system mainly consists of proton exchange membrane electrolyser, pressure swing adsorption unit, compressor, ammonia synthesis reactors and condenser. The designed configuration uses a cascaded approach for ammonia synthesis by employing two reactors in series to achieve

Biodiesel has been widely considered as an alternative fuel for aircraft and power generation turbine engines, but experimentation in literature is mostly limited to microturbines and technological challenges remain open regarding its sustainability. The present study publishes the experimental methodology and the obtained results of testing a full-scale turbojet engine J69-T-25A using blends of JetA1

Regarding the important role of combined cooling and power (CCP) systems in improving the efficiency of power plants, and also the ability of ORC and ERC systems in the exploitation of low-to medium-grade energy sources, a novel CCP system is presented which is based on geothermal flash cycle as topping cycle, organic Rankine cycle, and ejector refrigeration as the bottoming cycle for power and cooling

Greenhouse cultivation is a rapidly growing part of the agricultural sector. The reduction of energy use in greenhouses is strongly connected with the reduction of the production cost and the impact of greenhouse farming on the environment. In this work, an innovative greenhouse structure towards energy conservation and crop frost preventing is studied in a real scale greenhouse structure. The system

Thermochemical technologies used to burn municipal solid waste are one of the relatively new and appropriate methods for waste management. By burning waste, heat and gases have arisen which can be used as the energy source to generate electricity. Due to the high cost, pollution emissions and diversity of such power plants, comprehensive studies are required. Therefore, the purpose of this study is

The analysis of energy consumption patterns in agriculture is vital because of the concern for natural resources and the adverse effects of the misuse of various energy resources on human and environmental health. The present research is an attempt on the ecological sustainability assessment of rice production in Mazandaran Province, Iran, using the emergy analysis approach and fuzzy logic. Two agricultural

A solar concentration photovoltaic (CPV) system with compact linear Fresnel reflector (CLFR) concentrator is described in this paper. The design approach of the CPV system is introduced. Four different CLFRs are designed and compared, including one complete type and three hybrid type CLFRs. In order to evaluate the optical performance of the CPV system, solar concentration processes of the four CLFRs

We developed a comprehensive infrastructure simulator that optimizes the energy consumption of the city. The entire optimization of the simulator—including the planned network connecting the demand side to the supply side of the city—is a notable feature of the machine. The demand side equipment (air conditioning heat source type) and supply side infrastructure (system power, distributed power source

As global climate change is becoming a more pervasive issue, the environmental impact of electricity production is once again in the spotlight. In the context of global climate change it is critical to focus on shifting towards more sustainable electricity production methods, which meet the electricity demand without contributing significantly to the environmental footprint. Using photovoltaic (PV)

Photovoltaic market is a globally growing market, and this also reflects the current trend in Turkey. In this study, a grid-connected photovoltaic (PV) power plant of 2130.7 kWp rated power located in the eastern part of Turkey was analysed. The photovoltaic plant was assessed in terms of performance parameters such as reference yield, array yield, final yield, inverter efficiency, capture loss, system

In current attempt, to augment the efficiency of unit, turbulators with different styles were scrutinized. For better describing the nanomaterial behavior, mixture model was employed and turbulent flow with use of k-ɛ model was examined. For verification purpose, comparison with experimental data was reported. With involve of holes, Sgen,th augments about 8.88% for lowest Re. Highest reduction of Sgen

This study presents an evaluation of the potential impacts of Renewable Energy Sources (RES) and Demand Response (DR) on the Generation and Transmission Expansion Planning (GTEP) problem. This is highly essential in order to increase RES penetration in power systems thereby ensuring long term energy security and emissions reduction. GTEP with demand response is jointly considered so as to achieve an