Sadegh Seddighi

HAN University of Applied Sciences | HAN · School of Engineering and Automotive

Self-powered membrane-less seawater electrolysis is modeled to predict H2 production rate.

This paper explores the relationship between human health and energy technologies, with a focus on how energy technology needs to adapt to new health challenges. The authors examine how a clean, affordable, and reliable energy infrastructure is critical for mitigating the impact of future pandemics. They also look at how increasing the proportion o...

Harvesting electrical charge using triboelectrification provides a promising path to realizing uninterrupted self-powered sensors with application in wearable electronics and personal healthcare. This paper reports a high-performance flexible and stretchable self-powered humidity sensor based on triboelectric nanogenerators (TENG) that provides ext...

Measurement of oil and gas two-phase flow with variable flow regimes is to a large extent relies on flow patterns and their transitions. Using multiphase flowmeters in flows with high gas volume fractions usually associated with uncertainty. This work presents a dynamic neural network method to measure the flow rate using a nonlinear autoregressive...

This study investigates cold thermal energy storage (CTES) using a helical coil heat exchanger modified with bubble injection. One of the effective methods for increasing the heat transfer rate in heat exchangers is using bubble injection. A helical coil heat exchanger is immersed inside a cylindrical water storage tank, where the helical coil is t...

The triboelectric nanogenerator (TENG) is a promising technology for mechanical energy harvesting. TENG has proven to be an excellent option for power generation but typically TENGs output power drops significantly in humid environments. In this work, the effect of electrode’s material on power output, considering smooth and nanostructured porous s...

This work aims at capturing CO2 from natural gas using a verified finite element mathematical model by improving the membrane wettability, membrane structure, the type of absorbents used in the system, and the physical parameters like membrane porosity and the number of fibers used in hollow fiber membrane contactor (HFMC). The model is developed t...

Background: During the past 20 years, Iran has been experiencing a significant increase in the occurrence of disasters mainly due to the emergence of anthropogenic climate change. This paper aims at analyzing the trend of national budget allocation in Iran over the last 100 years to evaluate the focus of the Iranian state on the four phases of Prep...

Public-Private-People Partnership is a significant element in disaster response. COVID-19 as a pandemic has been the worst disaster in the last decades in Iran in terms of exposure and magnitude. In order to respond effectively, the Iranian government needs an extra capacity which may be provided by the private sector and people. This study aims to...

Oxy-fuel combustion is a promising technology for carbon capture and storage (CCS) from large point sources. In particular, fluidized bed (FB) boilers represent one of the power generation technologies capable of utilizing the oxy-fuel concept. This paper reviews the published material on the key aspects of oxy-fuel circulating FB, including the bo...

The steady flow test rig is a device for studying the influence of the intake and exhaust ports of the cylinder head on the flow motion inside the cylinder in internal combustion engines. In this paper, the swirl flow as a critical mixing mechanism inside the cylinders of internal combustion engines has been investigated by the vane type swirl mete...

This work investigates the simultaneous removal of CO2 and H2S from natural gas by a novel PVDF membrane structure using CaCO3 nanoparticles aiming at increasing the efficiency of separation process. This work presents to what extent the CaCO3 nanoparticles improve the separation efficiency; proposes the optimum range of nanoparticle share in the m...

This work presents a new method for reducing the formation of nitrogen oxide (NOx) emission in power generation by varying the dominating NOx formation reaction mechanism. A burner secondary oxidizer (BSO) injection is introduced in which a part of the required oxidizer for the reactions is distributed in a way to selectively increase the reactant...

This study presents the first results on comparing Na- and Ca- based absorbers for separating SO2 from flue gases in two-phase flows where the gas is modeled as a continuous phase and the absorber droplets are solved as a discrete phase. The reactions are solved as volumetric reactions where reactions are assumed to be in instantaneous equilibrium...

This work presents first-of-a-kind results on the enhanced oil recovery (EOR) by CO2 stream of oxy-fuel-fired circulating fluidized bed (CFB) boilers for Constant Furnace Size Scenario and Constant Thermal Power Scenario. The CO2 flow rate, the associated impurities and the furnace thermal properties are investigated. The total mass flow rate of th...

In this study, using spatial analysis of the effect of power plants placement as well Height, contamination of NO2 and SO2 for the 22 areas of Tehran. The results show that the power plant distance from residential areas has a strong negative effect with a precision of 99% on the amount of these two pollutants and this effect on the SO2 pollutant i...

In this study, numerical and laboratory analysis of the release of nitrogen oxides in a cylindrical combustion chamber under the flux combustion regimen (FLOX) and the effect of adding SO2 on the release of this pollutant has been addressed. The combination and entry of methane and air into the combustion chamber is non-premixed. In numerical simul...

This work presents the numerical results on reduction of sulfur emission from combustion of heavy oil in a combustion chamber. One of the most practical methods for sulfur emission reduction is flue gas desulfurization (FGD). In this study various FGD absorbers have been studied by means of numerical simulations. The flow is assumed turbulent two-p...

This work investigates the erosion of an elbow pipe due to the gas-solids turbulent pipe flow using computational fluid dynamics (CFD) with special attention to the effect of particle rotational motion on erosion. The gas-solid flow is solved by employing two-way coupled Eulerian-Lagrangian approach while enhanced wall treatment is used for modelin...

This work investigates the design of large scale oxy-fuel circulating fluidized bed (CFB) boilers in two industrial pathways of constant thermal power scenario and constant furnace size scenario using a new version of a model validated with 100 kWth and 4 MWth oxy-fuel CFB boilers. This work suggests that the major approach for elevating the circul...

The temperature and heat extraction parameters of a utility-scale, oxy-fuel-fired boiler are investigated using a mathematical model that was originally developed and validated with data from 100-kWth to 4-MWth oxy-fuel-fired circulating fluidized bed units. This work involves an existing furnace, which was developed for air-firing, and evaluates i...

Heat transfer to wall panels in the furnace of a circulating fluidized bed (CFB) was investigated by means of a mathematical model in combination with measurements obtained from a 4–MWth CFB unit operated under air and oxy-fuel firing conditions. The conditions at the wall panels corresponded to a concentration of solids in the range of 0.35–18 kg/...

Oxy-fuel combustion, which is a promising technology for the abatement of carbon dioxide emissions, can be applied in circulating fluidized-bed (CFB) power plants. In this study, the effects of operational conditions on the progress of oxy-fuel CFB combustion were investigated by means of a mathematical model for CFB oxy-fuel combustion together wi...

This paper investigates the heterogeneous and homogeneous reactions involved in the formation and reduction of carbon monoxide (CO) in a 100 kW oxy-fuel-fired circulating fluidized-bed furnace, using CO as an indicator of the progress of combustion. A mathematical combustion model, which takes into account both the mixing and kinetics, is developed...

A one-dimensional model has been developed with the aim of investigating oxyfuel circulating fluidized bed (CFB) combustion for CO2 capture with the main focus of assessing the heat balance of the CFB loop. For different oxygen concentrations in the gas flow fed to the furnace, the model calculates the external solids recirculation and the heat loa...