A performance analysis of solar chimney thermal power systems

The objective of this study was to evaluate the solar chimney performance theoretically (techno-economic). A mathematical model was developed to estimate the following parameter: Power output, Pressure drop across the turbine, the max chimney height, Airflow temperature, and the overall efficiency of solar chimney. The mathematical model was validated with experimental data from the prototype in Manzanares power. It can be concluded that the differential pressure of collector-chimney transition section in the system, is increase with the increase of solar radiation intensity. The specific system costs are between 2000 Eur/kW and 5000 Eur/kW depending on the system size, system concept and storage size. Hence, a 50 MWe solar thermal power plant will cost 100-250 Eur million. At very good sites, today’s solar thermal power plants can generate electricity in the range of 0.15 Eur/kWh, and series production could soon bring down these costs below 0.10 Eur /kWh

Silicate Sorption on Ankerite from a Standard Silicate Solution

Abstract This work represents the potential impact of geological deposition conditions on the durability of glass used for radioactive waste disposal. The durability of highly radioactive glass could be influenced by iron mineral compositions or other near field parameters inside the final disposal repository. In this paper, silicate sorption by natural ankerite is experimentally studied. Preliminary study using the graphite furnace atomic absorption method to measure the change in concentrations of silicon in standard solution in the presence of natural ankerite was performed. All standard solutions were diluted from a saturated silicate stock solution. Natural ankerite mineral samples which were collected from Rudabánya, Hungary, showed strong sorption of (H4SiO4) on their interface. Batch experiments containing specific masses of natural ankerite and silicate solution were carried out in order to illustrate a better understanding of silicate reduction in solution due to the sorption mechanism of ankerite, evidence that ankerite has the ability to uptake silicate was seen. The desorption of adsorbed silicate was tested and it was noticed that only very small amounts of silicate returned to the solution showed tiny reversed concentrations of silicate which may an indication of chemisorption

Commercial Banks' Contribution to Expanded Investment and Credit in Jordan

Purpose: The study aimed to investigate the role of commercial banks in increasing investment and credit facilities in Jordan.   Theoretical framework: The theoretical literature in this study sheds a light on the role of the commercial banks in in increasing investment and credit facilities. It also sheds a light on the role of commercial banks in supporting economy.   Design/methodology/approach:  The researchers adopted a descriptive analytical and quantitative approaches. The study’s sample includes all the commercial banks in Jordan. The researcher collected data on commercial banks from reports issued by the Central Bank of Jordan. The sampled banks include: (Bank of Jordan, Arab Bank, Capital Bank and Etihad Bank). The data targets the period (2017-2020).   Findings: The researcher found that there is an important role for Commercial banks in investment in general, due to an increasing the financial indicators of Commercial banks related to investment during the years (2017-2020). The study reported that the value of Commercial banks credit facilities increased significantly during .The comparison period (2017-2020)   Research, Practical & Social implications: The present study provides information and review of literature for the ones interested in conducting studies about the impact of commercial banks on economic variables. It also provides the decision makers in the Jordanian Ministry of Finance with useful information for supporting and improving investment in Jordan.   Originality/value: The present study is significant because it is the first study that addresses the role of commercial banks in increasing investment and credit facilities in Jordan as far as the researcher knows

Banking Risk Management In Jordanian Commercial Banks In Accordance with the Basel Accords

Purpose: The aim of this study is to shed a light on risk management in Jordanian commercial banks in accordance with the Basel Accords.   Theoretical framework: The researcher reviewed the relevant literature related to risk management   Design/methodology/approach: The descriptive analytical approach was adopted. The questionnaire was used as a data collection tool. The sample consists of all the public administrations in banks and employees in risk management and control. It consists from 120 individuals.   Findings: The results of the study showed that the field of "The application of banking risk management in Jordanian commercial banks in accordance with the Basel Accords" ranges from strong to medium, while the field of "Techniques and principles of banking risk management applied by Jordanian commercial banks" ranges from strong to moderate,   Research, Practical & Social implications: This study allows Jordanian commercial banks to improve their abilities in managing risks based on Basel accords   Originality/value: This study is important because it is one of the few studies that shed a light on Basel Accords along with risk managemen

Magnetic Contactless Crank-rocker Machine

Objective: In this paper, a proposed technique of motion transmission is introduced, which is based on the crank-rocker principle of motion. The energy transmission action is performed through magnetic force, in which no direct connection is made between the energy source input and the energy load output. Also, to illustrate the concept of motion and to approve the continuity of energy transmission using this proposed technique, a simple model of this mechanism has been built and run, showing the basic sequence of operation. Methodology/analysis: In this mechanical transmission mechanism, one side is rotating and the other side is vibrating, in which any side is energy input (which is usually the vibrating rocker), and the other side is energy output (which is the rotating crank). That seems similar to the classical crank-rocker machine in the four-bar mechanism, but without direct mechanical contact between the input and output energy stream. The concept of motion and mathematical analysis with structuring conditions is provided in this paper, where the dynamic analysis of the system is left for future work. A pilot physical prototype is manufactured and experimentally tested, validating the proposed design. Findings: The structural parameters of this proposed contactless crank-rocker machine have been modelled and simulated using the MATLAB program. It shows that these parameters could be selected and optimized to guarantee the minimum conditions for continued energy transmission. Based on these parameters, a simple model has been built and operated, which illustrates the concept of motion and validates the finding of MATLAB simulation. Novelty/improvement:Contactless crank-rocker motion is a very promising technique. It is possible to apply it in many applications, like the energy harvesting area, and it could be employed certainly in specific designs, such as MEMS, where no other motion transmission types can be used. Doi: 10.28991/ESJ-2022-06-02-07 Full Text: PD

Geomorphological Mapping of Razzaza–Habbaria Area using Remote Sensing Techniques

Landforms on the earth surface are so expensive to map or monitor. Remote Sensing observations from space platforms provide a synoptic view of terrain on images. Satellite multispectral data have an advantage in that the image data in various bands can be subjected to digital enhancement techniques for highlighting contrasts in objects for improving image interpretability. Geomorphological mapping involves the partitioning of the terrain into conceptual spatial entities based upon criteria. This paper illustrates how geomorphometry and mapping approaches can be used to produce geomorphological information related to the land surface, landforms and geomorphic systems. Remote Sensing application at Razzaza–Habbaria area southwest of Razzaza Lake shows the different geomorphologic units and the land use maps that were delineated from Landsat ETM+ Image. Digital Image unsupervised classification was adopted to delineate the different classes by applying ERDAS 8.4 software. According to this classification five classes were selected and delineated in different colors

Impact of Climate Changes on the Hydrochemistry of Razaza Lake and Rahaliya – Shithatha Springs – Central Iraq

The climate parameters, rainfall, temperature data for more than forty years for three Iraqi meteorological stations (Baghdad, Basra, and Mosul) were studied .The results show good evidence of climate change indicated by the remarkable decrease of the average means annual rainfall in the studied stations, with the remarkable increase of the average minimum annual temperature. The impact of the climatic change on the hydrochemistry of Razaza lake and Rahaliya – Shithatha springs was obvious in increasing the water salinity as studied for years 1995 and 2013. The average mean annual rainfall for ten years intervals indicate that there were a remarkable decrease in amount of rainfall from 90 mm for the period 1992-2001 to about 71 mm for the period 2002- 2013.  The Razzaza lake water has indicated that chloride group and one major family (Chloride-sodium family) is the dominant for years 1995 and 2013 with increase of Mg ions during 2013. The Rahaliya – Shithatha springs’ water has showed that the sulphate and chloride groups are dominant for years 1995 and 2013, with increase of sulphate group to 80% during 2013. Keywords: Climatic changes, hydrochemistry, Razaza lake and Rahaliya – Shithatha springs, Iraq

Basins and Cultivated Lands Recharge Evaluation on The Basis of Experimental & Mathematical Analysis in Hashimiya-Iraq

القياسات الرياضية والحقلية والدراسة المختبرية المعتمدة لتققيم صلاحية الاشكال الرياضية ضمنها نموذج هورتن في حساب الترشيح وهي معادلة الطاقة والمتعددة والمختلطة . العمل شمل قياسات الترشيح لمنطقة الهاشمية الواقعة وسط العراق والتي قسمت الى تسعة قطاعات اداريةهي الجربوعية ،الهاشمية ،النويدرة ،الطبرة ،ااسادة ،الزينية ،اج3،الفياضية والتياس.الدراسة الحالية أثبتت أن معادلة الطاقة هي الافضل حيث يصل معامل الارتباط 0.996 بينما للمتعددة والمختلطة وهورتن 0.947،0.958 و0.84 على التوالي. من الجدير بالذكر ، ان نموذج هورتن يعرض ترشيح اوطأ بعد الساعتين.عمق الترشيح الحقيقيي في الطبقة الحاملة التحت سطحية حسبت بالاعتماد على النماذج الحقلية والفحوصات المختبرية لنسيج التكوين الجيولوجي لتحديد المسامية لمنطقة الهاشمية.A mathematical, field measurements and laboratorial study was adopted to evaluate the validity of many mathematical forms including Horton Model for estimating infiltration rate and infiltration potential, they are; power, polynomial and mixed formulas. The work composed of infiltration field measurements for Hashyimia Region located in the middle of Iraq which for simplicity and accuracy is divided into nine administration agricultural sectors namely as; Jerboeyia, Hashyimia, Niwedra, Tebra, Sada, Zineyia, H3, Fayadhiya, and Bazul sectors. The current study proved that the power formula is the best fit to the measuring data than polynomial, mixed and Horton models since the power formula offers 0.996 correlation factor whereas polynomial, mixed and Horton offer 0.947, 0.958 and 0.84 respectively. It is worth to mention that in all cases Horton Model offers less infiltration potential after 2hrs since infiltration process is starte

Исследование работоспособности эксцентрикового сверлильно-фрезерного патрона

In work the description of a design and results of research of characteristics a drilling- milling cartridge is resulted.Приводится описание конструкции и результаты исследования характеристик эксцентрикового сверлильно-фрезерного патрона

Energetic Investigation and Economic Feasibility for a University Campus in Romania towards Becoming an Energy Supplier

This research investigates and evaluates the University Politehnica of Bucharest (UPB) possibilities to become an energy self-supplying by building up its own power plant and becoming an energy distributor. The campus has already been connected to the national natural gas supplying pipe and the local district heating and electrical network.A set of criteria was used to evaluate the feasibility of this project. Technical, financial, and environmental considerations were taken into account to determine the most suitable solution. The feasibility study assumed three proposals of an energy supply system considered for the university buildings / campus. Gas-fired heating plant, gas-fired Internal Combustion Engine cogeneration plant and gas fired Internal Combustion Engine for cogeneration with an Organic Rankine Cycle ORC.The details of each proposal were discussed to obtain the optimum solution. Elaborate. It was found from a financial and environmental perspective that the most feasible project is gas-fired Internal Combustion Engine cogeneration, considering profit revenue from selling / exporting power to the domestic electricity grid. And the Net Present Value was around one million euros for 15 years life