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Article
The Parameters Change with Different Operation Conditions of Solar Chimney Power Plant Model

Authors: Rafid M. Hannun --- Salih E.Najim --- Mohammed H. Khalaf
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2014 Volume: 14 Issue: 2 Pages: 189-199
Publisher: Basrah University جامعة البصرة

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Abstract

The solar chimney power plant is one of the modern models studied on the world. This study presents an engineering and numerical analysis of solar chimney with different parameters. Also, it studies the comparison of two collector base shapes(circular and hexagonal) depend on the five storage material types and their effects on the heat transfer, velocity, efficiency, etc. inside the solar chimney system by considering the solar array intensity equations and the energy equation to calculate the heat transferred and stored by applying the laws of CFD. The finite volume method is used to analyze the geometry physical model by applying a commercial Fluent 6.3 code with Gambit 2.3. The obtained results show that the efficiency of solar chimney is increased by increasing the area of solar glassed collector with circular base shape than the others of polygonal or rectangular one because the circular was covered large area of system. So, the circular ground collector shape for thermal storage is the favour because it is the better to increase the velocity of entering air and to increase the efficiency of turbine. In addition to that the black Pebble storage plate is the better material for heat storage which is convected to air passed for operation of turbine than the other types aluminum, tar, copper and steel seriously.Keywords: solar energy, power tower, power chimney, renewable.


Article
Solar Chimney and Power Tower Techniques for Power Production in Nasiriya City

Authors: Rafid M. Hannun --- Mohammed H. Khalaf --- Amel Hashim Husain
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2018 Issue: 18 Pages: ُE63-E76
Publisher: Ministry of Oil وزارة النفط

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Abstract

The solar chimney and power tower are two of modern promised energy which can develop by low losses, simplicity and high power. In this paper, the solar chimney and fossil fuel power tower parameters are studied by using theoretical equations in computational fluid dynamics CFD that substituted in some computer programs such as MATLAP and FLUENT codes with additional related expressions. Five different models are used in this paper (Chimney height is: 12, 15, 20, 25, and 35 meter), (Diameter of collector base is: 5, 8, 10, 15, and 20 meter). The effect of inlet collector height, collector absorbability, solar radiation, ambient temperature, solar collector thickness and solar collector tilt angle are studied to find the other parameters and properties such as velocity distribution, power and efficiency of system. The erecting of power turbine is predicted by findings the velocity distribution between the base and chimney assembly. The numerical analysis was presented by using GAMBIT and FLUENT 6.3 to predict that high velocity at the expansion of chimney near the center of base – chimney bond position because of low density of air as a result to solar radiation flux (and burned gases cover collector in case of using the chimney for combustion of gases in oil refineries).. This position is very suitable for promoting and building the power turbine. The maximum power accumulated from these techniques is more than (6.7×105 Watt) where the velocity is (17.5 m/s). The study concluded that it is easy work to erect these chimney and power tower techniques closed to drilling and oil facilities in remote areas. So, all factors were studied to coincide with previous papers in this field.


Article
Design and Implementation of an Electronic Nose Based on Power-Law Model

Authors: Manlio Gaudioso مانيلو كاديبسو --- Giancarlo Raiconi دونكارلو ريكوني --- Walaa Mohammed H. Khalaf ولاء محم
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2011 Volume: 15 Issue: 4 Pages: 77-86
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Electronic noses are intelligent systems having the ability to identify and quantify different gases. They are capable to handle large data sets and to perform quite complex signal processing by employing commercial sensors. In this paper we examine four different gases (ethanol, methanol, acetone and benzene). The data are acquired and processed by a prototype multi-sensor monitoring system (electronic nose) which has been designed at University of Calabria. It includes five gas sensors plus two auxiliary sensors, for temperature and humidity, respectively. The system is equipped by an appropriate interface to a PC for visualizing and analyzing the data.
We introduce an analytical power law model of sensor response. Least square regression is performed to estimate model parameters. The model is then used for both gas classification and concentration estimate. The results of the numerical experiments on 172 gas samples are reported.

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