PhD Engineer at transmission company
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Saad Khan currently works at the Department of Electrical Engineering, United Arab Emirates University. Saad does research in Electrical Engineering. Their current project is 'fuel cell prognostic and diagnostic'.
June 2011 - present
- Managing Director
This paper introduces a novel dynamic semiempirical model for the proton exchange membrane fuel cell (PEMFC). The proposed model not only considers the stack output voltage but also provides valid waveforms of component voltages, such as the no‐load, activation, ohmic, and concentration voltages of the PEMFC stack system. Experiments under no‐load,...
This paper presents a dynamic temperature model for a proton exchange membrane fuel cell (PEMFC) system. The proposed model overcomes the complexity of conventional models using first-order expressions consisting of load current and ambient temperature. The proposed model also incorporates a PEMFC cooling system, which depends upon the temperature...
This paper deals with modelling proton exchange membrane fuel cell (PEMFC) open circuit voltage model. Unlike conventional models it reduces the cost of special sensors required in PEMFC which calculate the hydrogen and oxygen pressure inside the fuel cell system. The model uses semi-empirical equation to consider the water vapour pressure in PEMFC...
Proton exchange membrane fuel cell PEMFC is nonlinear source so modeling its output is essential. Also PEMFC is extremely prone to change in ambient conditions. Previously the complex modeling techniques have been used to model PEMFC voltage, but these technique are not good for online purposes. Hence a semiempirical approach has been suggested for...
This paper proposes a simplified proton-exchange membrane fuel cell (PEMFC) temperature model for the purpose of estimating PEMFC temperatures with high accuracy using air-cooling systems. Besides knowing that most of the existing models were designed for specific systems, the proposed model also focuses on generalizing the conventional temperature...
The availability of cost-effective and environmentally friendly electricity to the entire population is a prime concern of the South African government. It has brought attention to microgrid projects, especially when rural population is considered properly. To address the energy needs of any country, the focus line should be the cost and availabili...
Proton exchange membrane fuel cell (PEMFC) is a substitute energy source that provides electricity from hydrogen and oxygen fuel. The PEMFC has found its application not only in electric power generation but also has founds its use in electric vehicles and aircraft applications. The performance of the PEMFC is affected by the variation in ambient c...
This paper introduces a dynamic semiempirical model that predicts the degradation of a proton exchange membrane fuel cell (PEMFC) by introducing time-based terms in the model. The concentration voltage drop is calculated using a new statistical equation based on the load current and working time, whereas the ohmic and activation voltage drops are u...
The membrane water content of the proton exchange membrane fuel cell (PEMFC) is the most important feature required for water management of the PEMFC system. Any improper management of water in the fuel cell may lead to system faults. Among various faults, flooding and drying faults are the most frequent in the PEMFC systems. This paper presents a...
Due to the impediments of voltage source inverter and current source inverter, Z-Source Inverter (ZSI) has become notorious for better power quality in low and medium power applications. Several modifications are proposed for impedance source in the form of Quasi Z-Source Inverter (QZSI) and Neutral Point Clamped Z-Source Inverter (NPCZSI). However...
Proton exchange membrane fuel cell (PEMFC), as a source of electrical power, provides numerous benefits such as zero carbon emission and high reliability as compared to wind and solar energy. PEMFC operates at very low temperature, high power density and has very high durability as compared to other fuel cells. Being a non-linear power source with...
Proton exchange membrane fuel cell (PEMFC) is the most common type of fuel cell because of its many advantages over other renewable energy sources and other fuel cell types. The PEMFC is used for power and electric vehicle applications. Static and dynamic characteristics are of vital importance; the PEMFC has been modeled in numerous research using...
Wind energy has been widely harvested compared to the other renewable energy resources. Unfortunately, the cost of wind electricity generation is expensive for small-scale utilization. The objective of this work is to develop a low power and low-cost wind electricity generator by using an automotive alternator that can be utilized for small-scale g...
Proton exchange membrane fuel cell is an emerging renewable energy resource for transportation and power generation. Similar to other renewable resources, the performance of proton exchange membrane fuel cell is affected by ambient conditions. However, procedures for analyzing the influences of such conditions on the performance of proton exchange...
This article elaborates the novel approach for airgap magnetic field analysis of switched reluctance motor in case of rotor cracks and rotor tilt around its shaft axis. The fault diagnosis is illustrated on the basis of a 3-D model of the SRM using of a technique known as finite element analysis (FEA). The flux linkage analytical equations are used...
Renewable energy sources (RES) (fuel cell, hydro, wind, and solar PV) are having great impact on low voltage (LV) distribution networks and their operations. To overcome major power quality (PQ) issues such as voltage harmonics, flickers, and reactive power burden, a model of the practical medium voltage (MV) distribution system is presented in whi...
Power transmission lines provide a link between generation center and end user in every country. These generation power unit are located at different location in country. In Pakistan the generation is provided by hydral unit mostly located at northern areas of Pakistan and thermal power plants. These generation center are connected with National Gr...
%% fundamental parameter
IQE =1; % internal quantum efficiency
%% Circuit parameter for the solar cell, in units of Ohm.m2
RsContact = 0; % series resistance
Rsh = 1e6; % shunt resistance
%% environmental parameters
Tc =300; % temperature of the cell
%% doping density
ND = 0; % donor doping density
NA = 0; % acceptor doping density
%% Cell geometrical parameter
L = 1e-6; % thickness of cell
%% Material parameters
Material ='CdTe'; %either Lossy or Ideal
tau_SRH = 0.5e-6; % SRH lifetime in units of Seconds
Cn = 6e-32*1e-12; % Electron Auger recombination coefficient
Cp = 0.3*1e-30*1e-12;% Hole Auger recombination coefficient
RefBelow = 1; % reflectivity of the back-mirror of the cell
Mun = 1e3*1e-4; % electron mobility in m^2/(V.sec)
Mup = 500*1e-4;% hole mobility in m^2/(V.sec)
RefBelow = 1; % reflectivity of the back-mirror of the cell
nr = 3.5; % refractive index, assumed to be same as GaAs
%% Absorption Coefficients
Absorptivity = 'Dispersive'; % can be either Step or Dispersive
AbsorpCoeff = [600000000 200000000 100000000 50000000 20000000 400]; %% provide the material absorption coefficient
% here, in units of 1/m
Lambda = 1e-9*[260 400 500 600 800 900]; %% provide the wavelengths (in m) at which the
% absorption coefficient was measured, the array length should be
%the same as the absorption coefficient array
Eg = 1.124*q;
Eg = 1.31*q; % bandgap
Tfront =1; % Transmissivity of the front surface of the cell,
%% effective mass calculation
mc = 0.11*m0; % electron DOS effective mass
mv = 0.04*m0; % hole DOS effective mass
%% incident spectrum
SourceType = 'Spectrum'; % can be eithe Blackbody expression or an
% tabular spectrum, like AM 1.5 in W/m^2
Pin = [0.2 1.7 1.4 0.75 0.5 0.25]; %% provide the material incident spectrum here
% , in units of W/m2
LambdaSource = 1e-9*[250 500 750 1000 1250 1500]; %% provide the wavelengths (in m) at
% which the incident spectrum was measured, the array length should
% be the same as the absorption coefficient array
Esource = h*c./LambdaSource;
Emissivity = 1;
GeometricViewFactor = 2.18e-5*Emissivity; % View factor of the Sun,
% from the solar cell
Ts = 6000;
func = @(x) 2*pi*x.^3./(c^2*h^3*(exp(x/(kb*Ts))-1));
Esource = linspace(1e-3,10,1e3)*q; % photon energy array
Pin = func(Esource)*GeometricViewFactor.*Esource; %incident power
% in watts/m^2
Can anyone share his experimental data on PEMFC (other than Horizon 500 W PEMFC and NEXA 1200 W) which has a fan cooling system, I need current, ambient temperature, PEMFC temperature changes, also please mention number of fuel cells in a stack, area of fuel cell, mass of fuel cell as per datasheet. I will mention the person in my upcoming journal. This journal includes thermal modelling of PEMFC.