This paper develops a geothermal driven combined heating and power system to obtain multi-generation, in which power is generated by Organic Rankine Cycle and heating is supplied by radiant floor heating system. Comprehensive thermodynamic, exergoeconomic and exergoenvironmental models of the system are performed and the capital cost and environmental impacts of the system components are analyzed.

The development of an integrated solar energy system with multiple outputs is necessary for achieving sustainability for countries like India. A building-integrated passive solar energy technology (BIPSET) is developed for the generation of power, and water in addition to the air ventilation for the attached building prototype. The building prototype is scaled down to the model of the living room proposed

The purpose of this research is to evaluate greenhouse gas emission reduction opportunities from cogenerated electricity in oil sands production. A novel combined market penetration and bottom-up energy system modelling framework was developed to assess the long-range potential and marginal costs of cogenerated electricity in the oil sands. Feasible scenarios for incorporating cogeneration into the

Floating solar technology (FPV) emergence is driven by lack of available land, loss of efficiency at high operating cell temperature, energy security and decarbonization targets. It is a promising area of solar photovoltaic application, with a large global market potential. A significant challenge when assessing FPV projects is the lack of a suitable simulation tools for estimating the electricity

With the increasing demand of power sources, it is of great significance to evaluate different power generation systems and optimize the energy structure. The emergy is proved to be a comprehensive and powerful way to evaluate the sustainability of a system. In this paper, emergy is used to compare ten power generation systems by two calculation methods of emergy indices. The emergy data of integrated

Compressed air energy storage (CAES) systems are promising for the application of a standalone hybrid system. This study adopts a scenario-based bi-level programming method to design a standalone hybrid system that mainly contains wind turbines, diesel generators (DGs), and a CAES system. The demand response is considered as a deferrable load. The uncertainties on the wind power outputs and load demand

Seasonal performance of a heat pump in heterogeneous ground is investigated using a resistance-capacity model. Heat pump and borehole heat exchanger models are based on the existing ground-coupled heat pump system. Simulation results show that the application of average undisturbed ground temperature instead of a ground temperature profile has no effect on the obtained seasonal values of the coefficient

The conceptual design and systematic comparison of S-CO2 coal-fired power generation systems are performed in the viewpoint of the thermodynamic analysis and economic assessment to promote the practical application in the industry. First, the differences between the conventional steam boiler and S-CO2 boiler are pointed out. 3 layouts of the water-cooling wall are compared in the aspect of the hydrodynamic

In the present study, performance improvement of SRC and ORC systems used as a bottoming system in a GT based triple combined system was evaluated for varying turbine inlet temperature and pressure. In the first step, SRC was parametrically optimized for a varying pressure (from 10 bar to 100 bar) and temperature (from saturated steam temperature to 480 °C). In the second step, a parametric optimization

In order to reduce the cost of CO2 capture and storage, and promote the application of this technology in the coal chemical industry, we propose an integrated process combining an organic Rankine cycle, an absorption refrigeration cycle, and the purification of syngas from coal. Its purpose is to make efficient use of the waste heat produced in the manufacture of natural gas from coal, converting it

Hybrid fossil/renewable energy combined heat and power (CHP) systems harness local energy sources, save fossil fuels, and reduce greenhouse gas emissions. Here geothermal energy is integrated into a natural gas driven CHP system by employing both vapor-compressor and absorption cycles through a geothermal heat pump (GSHP). To increase the performance of the heat pumps, the mixed hot water from the

In the study, the daily and monthly performance of a photovoltaic thermal system integrated with phase change material is investigated in Shanghai, China. A three-dimensional model of photovoltaic thermal system integrated with phase change material system is developed and numerically simulated. Water is considered as working fluid, and the fluid flow regime is laminar and incompressible. Both quasi-steady

Part of the process gas cooling in a sample gas refinery is provided by a two-stage vapor compression refrigeration cycle. This cycle has been designed only based on thermodynamics’ objective function with propane refrigerant. A gas-turbine is used as the compressors’ driver in this sample plant. In the present study, the complete investigation of this compression refrigeration cycle with its gas turbine

A parametric investigation of the effects of excess air/fuel ratio (λ), spark timing (ST), and methanol injection timing (MIT) on the combustion characteristics and performance of a natural gas/methanol dual-fuel engine was conducted. The operation was carried out at 1600 rpm and a low load. λ was varied from 1.2 to 1.6, in increments of 0.1. The ST was kept close to the optimized value of brake thermal

In this study, the off-design performance of a Power-to-Gas process are predicted by means of a developed calculation model, implemented in commercial tool environments. With the aim to evaluate the behaviour of the several components in off-design conditions, specific calculation models have been integrated in the whole system model. Then, starting from a real wind production profile, four configurations

Utilization of waste or low grade energy can significantly contribute to the world’s energy demand and reduction of carbon dioxide emissions by employing absorption refrigeration systems. One of the major concerns linked with absorption refrigeration is its low efficiency and high capital cost. In present work, the objective was to develop an economic model for absorption refrigeration system adopting

A novel waste incineration power system highly integrated with a supercritical CO2 power cycle and a coal-fired power plant has been developed. In the hybrid configuration, the supercritical CO2 cycle gains energy from the superheater of the waste-to-energy (WTE) boiler, and the saturated steam produced by the WTE boiler is employed to heat the feedwater of the coal power plant. Consequently, the cascade

Heat pumps represent a link between different energy vectors and their application in thermal and electrical grids can improve the overall operational flexibility of the system. In this work, the optimal integration of electrically driven heat pumps within a hybrid distributed energy system is investigated. A multi-objective stochastic optimization methodology is proposed to evaluate the integrated

A new model for mapping the near-surface wind speed L-moments on a high spatial resolution scale (250 m × 250 m) is introduced (GloWiSMo). The target variables are the first five L-moments of 6146 globally distributed wind speed time series. ERA5 reanalysis wind speed available on a 0.25° × 0.25° grid was used as predictor representing the large-scale wind field. Eleven predictors derived from a land

This study evaluated the outcome differences when adopting five different solar irradiation databases on the sizing of hybrid solar photovoltaic-diesel generators designed to supply electricity to isolated minigrids. To do this, the two most widely adopted photovoltaic (PV) simulation packages in the market, namely PVsyst® and HOMER Energy® were used. The different origins, data timespan, space and

The blade air loads of the Airborne Wind Turbine (AWT) may be significantly influenced by the unsteady flow-field at high altitude. Under these susceptible situations, the rotor needs in-depth considerations with respect to transient aspects. The present study focuses on the unsteady aerodynamic performance of stand-alone rotor under the influence of wind shear, yawed, and tilted configurations. The

Following paper presents detail investigation of the Maisotsenko cycle (M-Cycle) cooling tower through numerical modeling. For the purpose of this study, ε-NTU model of the M-Cycle cooling tower (MCT) was developed and validated against experimental data. The results of the simulation allowed to analyze the heat and mass transfer process occurring inside the M-Cycle cooling tower and observe its most

In the present article, the thermodynamic potential of a sustainable plasma-assisted nitrogen fixation process for co-production of ammonia and hydrogen is investigated. The developed process takes advantage of chemical looping system by using a liquid metal such as gallium to drive nitrogen fixation reaction using three reactors including reactor R1 to produce gallium nitride from gallium and nitrogen

Steam Rankine cycle is the most widely used power cycle for the electric power generation and its process modification can effectively improve the power generation efficiency. To evaluate the thermal performance of these process modifications, the “thermal cycle splitting analytical method” was proposed and illustrated by general formulas. In this analytical method, the modifications of the thermal

The paper presents a new control method to optimize energy flows of a micro-scale concentrated solar power (MicroCSP) system in order to minimize the electrical energy consumption of a building heating, ventilation, and air conditioning (HVAC) system integrated with a MicroCSP system. A new real-time optimal control method is proposed using exergy-based model predictive control (XMPC) techniques. To

In this paper, a conceptual design of decoupled duplex Stirling machine was described. The motions of the displacers and the shared piston were decoupled by controlling the displacers and piston to be stationary at the top or bottom dead center. The overall coefficient of performance (COPoverall) of decoupled duplex Stirling machine could achieve 1.11–1.4 and 1.7–2.1 for cooling and heating respectively

A constructal thermodynamic optimization model for ocean thermal energy conversion system (OTECS) with a dual-pressure organic Rankine cycle (DPORC) to make better use of the ocean thermal energy is established in this paper. It is performed by combing constructal theory with finite time thermodynamics. Optimal design of the OTECS is conducted under the conditions of the fixed total heat transfer area

Mechanical energy storage systems are among the most efficient and sustainable energy storage systems. There are three main types of mechanical energy storage systems; flywheel, pumped hydro and compressed air. This paper discusses the recent advances of mechanical energy storage systems coupled with wind and solar energies in terms of their utilization. It also discusses the advances and evolution

This paper focuses on evaluating a free piston Stirling engine (FPSE) using describing function method along with a genetic algorithm (GA). In this regard, first, the nonlinear terms of the free piston Stirling engine are investigated by describing function technique and then, the stability of system oscillation is demonstrated using the proposed novel method. Indeed, the mentioned idea is characterized

Aiming to make full use of the heat on PV, a novel solar assisted heat pump with hybrid Fresnel PV plus TEG evaporator (FPV/TEG/SAHP) is proposed and the performance is predicted in this paper. As we all know, most irradiation is transformed to heat as the solar irradiation is absorbed by the PV, resulting in high temperature, while the evaporator of the heat pump could provide a lower temperature

This article aims to propose a novel high-efficient, autonomous, hybrid solar air purification, electrical generation and thermal recovery system, and conduct a preliminary feasibility analysis on the proposed system. The main works involve: (1) a short review on PV/T driven purification technology, (2) the introduction on the PV/T driven air purification system based on the heterogeneous photocatalytic

Organic Rankine cycle (ORC) is a promising technology to recovery and utilization of low grade thermal energy. In recent years, there are few researches on ORC performance prediction based on Machine Learning, mainly due to a lack of reasonable methodology and case demonstration. This paper presented a comprehensive method to achieve a reasonable application of Machine Learning into ORC research for

By coupling the heat transfer and chemical reactions, biomass-steam gasification in a lab-scale spouted gasifier is numerically simulated via the multiphase particle-in-cell approach. The proposed model is firstly validated with the experimental results. Then, the spatial distributions of biomass particles, spout-annulus boundary, the gas species, the gas-solid flux, together with the influences of

Indigenous peoples in the Northern communities of Canada are experiencing some of the worst catastrophic effects of climate change, given the Arctic region is warming twice as fast as the rest of the world. Paradoxically, this increasing temperature can be attributed to fossil fuel-based power generation on which the North is almost totally reliant. At the moment, diesel is the primary source of electricity

A large part of the scientific community efforts is focused on improving efficiency and reducing costs of desalination processes. For that, this work presents a methodology to find optimal operation strategies, based on genetic algorithms and a highly customizable dynamic solar desalination model set, of any system’s configurations according to several criteria. This methodology has been tested in

The present paper evaluates numerically the feasibility of a solar jet-ejector refrigeration system from an efficiency maximization perspective with three low environmental impact refrigerants, namely, R1234yf, R1234ze and R600a. Special emphasis is given to the jet-ejector internal geometry optimization as a mechanism to improve the overall cycle performance. The jet-ejector entrainment ratio in different

The present study investigates the thermo-fluid characteristics of a double pipe heat exchanger (DPHX) with split longitudinal fins (SLF) on the annulus side. The studied tubes with SLF are a modification of the conventional longitudinal finned tubes (LF) that allows for consecutive surface interruptions to break the boundary layer and provide an interrupted fluid passage along the flow length. The

This article is intended to deepen the understanding of molecular shape selectivity of HZSM-5 in catalytic conversion of biomass pyrolysis vapors through the study of catalyst effective pore size. Ex-situ catalytic fast pyrolysis (CFP) of biomass over HZSM-5 with varied catalyst loadings were carried out using a continuous feeding two-stage fluidized-bed/fixed-bed combination reactor. Results showed

There is a wide array of biomass utilisation pathways to mitigate greenhouse gas emissions. The characteristic of biomass, the demand for products, and the local constraints determine the sustainability of utilisation. Generic principles and criteria can be applied to the analysis of specific instances. This work develops a decision-making tool for determining the most sustainable use of biomass for

With the increase in global environmental problems and the energy crisis, the oscillating wave surge converter has been extensively studied in the past decades owing to its simple geometry and direct energy capture mechanism. However, systematic optimization of this converter is yet to be achieved. Consequently, in this study, a scaled oscillating wave surge converter under regular waves is numerically

Strict internal space limit of compact electronics makes it hard to use cooling tubes for the forced convection or phase change materials (PCMs) block to thermal control. In this paper, two types of high thermal conductive flexible phase change material (FPCM) with latent heat of 160.2 J/g and 153.1 J/g were developed into film morphology with the thickness of 0.4 mm, and were used to manage heat dissipation

It is important to determine the most optimal configuration of a Savonius vertical axis wind turbine that attains the best performance with a high self-starting ability. Thus, the effects of several design parameters including twist angle, overlap ratio, and endplates size ratio, along with the wind velocity on the performance of the Savonius wind turbine are investigated. Novel assessment methods

A combined cooling, heating, and power generation system is proposed for the recovery of exhaust waste heat of the diesel engine. The engine rejected heat recovery system consisted of a domestic water heater (DWH), an organic Rankine cycle (ORC) and an Ejector Refrigeration Cycle (ERC) for heating aims, power generation, and cooling aims, respectively. The Diesel engine is fed by different fuels and

In this paper we report on the design and testing of a novel vertical axis wind turbine (VAWT) system. The system consists of two counter-rotating VAWT rotors and a deflector that is placed between the two rotors. The system’s performance is first quantified in wind tunnel experiments and subsequently, three-dimensional computational fluid dynamics (CFD) simulations are performed to complement the

In this paper, a new analytical method is proposed to extract all five-parameter of solar cell, namely the shunt resistance, series resistance, diode ideal factor, photo-current, and reverse saturation current density, based on the one-diode model of silicon solar cells. By applying the relationship between the slope of I–V curve and five parameters, five individual algebraic equations are established

The present paper investigated the seasonal solar thermal energy storage (SSTES) using solid-gas thermochemical sorption technology that has inherently combined function of heat pump and energy storage. The thermochemical reactions that can discharge heat at a higher temperature usually requires a relatively higher desorption temperature during charging process, which could be problematic to efficiently