scholarly journals Numerical investigation of solar collectors as a potential source for sintering of ZrB2

2021 ◽  
Vol 1 (2) ◽  
pp. 76-84
Author(s):  
Mohammad Vajdi ◽  
Saeed Mohammad Bagheri ◽  
Farhad Sadegh Moghanlou ◽  
Amin Shams Khorrami
Keyword(s):  
Solar Energy ◽  
High Temperatures ◽  
Focal Point ◽  
Good Alternative ◽  
Heat Radiation ◽  
Collector System ◽  
Alternative Material ◽  
Energy Consuming ◽  
Ultrahigh Temperature ◽  
Solar Heat Flux

Sintering of ceramics is an energy-consuming process that needs high temperatures, therefore, in the present work; solar energy is used to produce high temperatures for the sintering aim of different materials. Solar energy concentrators increase the intensity of incident energy to the receiver provides high temperatures. Ultrahigh-temperature ceramics (UHTCs) due to their high melting point can also be a good alternative for receiver materials. In the present work, ZrB2 is introduced as an alternative material for solar receivers which can withstand high temperatures of sintering. The governing equations, including heat radiation and conduction ones are solved numerically using the finite element method. Transient heat transfer in the concentrator-collector system is investigated to check the feasibility of high temperatures needs for sintering at the receiver. The highest temperature of 1680 °C was achieved after 15 minutes at the focal point of the concentrator when the solar heat flux of 6.86 w/mm2 used for the location of the city of Ardabil in Iran. The obtained temperature can be used to sintering of some groups of materials.

scholarly journals The use of solar energy for the curing of ferrogeopolymer elements in the semiarid region

2019 ◽  
Vol 276 ◽  
pp. 01031 ◽  
Author(s):  
Partogi H Simatupang ◽  
Petrus Lubalu ◽  
Herry L Sianturi ◽  
Wilhelmus Bunganaen
Keyword(s):  
Solar Energy ◽  
Low Cost ◽  
Glass Plate ◽  
Energy Resource ◽  
Semiarid Region ◽  
Collector System ◽  
Good Potential ◽  
Dry Seasons ◽  
Wire Meshes ◽  
Potential Use

Kupang City in Timor Island of Indonesia, as a semiarid area, has abundant solar energy sources. Based on climatology data of Kupang City in 2013-2015, the minimum and maximum average temperatures in Kupang City range from 19.3-34.8oC. Besides, dry seasons last for about 8 months (April-November). This abundance of solar energy is a potential energy resource for the manufacturing of environmentally friendly ferrogeopolymer elements. Based on previous research, the production of geopolymer material can be done optimally with dry curing treatment at 60-80oC for less than 48 hours. Therefore, in this paper, a low-cost, energy efficient oven operated by a solar energy collector was developed. This paper describes a feasibility study of the use of solar energy for curing ferro-geopolymer elements. The ferro-geopolymer elements made were beams with length 600 mm, width 100 mm and height 100 mm. Wire meshes with 6x6mm of opening were used in 5 layers. The solar energy collector system used as an oven was a zinc coated drum which was painted black outwardly and was covered by a glass plate. Using this oven, it was possible to increase the ambient temperature by 1.62 to 2,37 times. Furthermore, this oven can also increase the flexure strength of ferrogeopolymer elements about ± 25.34%. This paper shows good potential use of solar energy in the manufacturing of ferro-geopolymer elements in the semiarid region.

Optimal solar energy collector system

Solar Energy ◽  
1975 ◽  
Vol 17 (2) ◽  
pp. 91-95 ◽  
Author(s):  
M. Kovarik
Keyword(s):  
Solar Energy ◽  
Collector System

scholarly journals Effect of adding insulation on the energy performances of rammed earth buildings in hot and arid climates

2020 ◽  
Vol 150 ◽  
pp. 01011
Author(s):  
Wical Cheikhi ◽  
Khadija Baba ◽  
Abderrahman Nounah ◽  
Choukri Cherradi
Keyword(s):  
Good Alternative ◽  
Energy Performance ◽  
Simulation Software ◽  
Sustainable Construction ◽  
Rammed Earth ◽  
Before And After ◽  
Energy Consuming ◽  
High Level ◽  
Earth Walls ◽  
Raw Earth

In a world context focused on energy efficiency and sustainable construction, returning to the use of raw earth in construction constitutes a good alternative to concrete construction, a system more energy consuming and yet more used nowadays. This return is justified by the excellent energy performance and the high level of thermal comfort provided by earth constructions in different climates. In cold climates, adding an insulation on earth walls has proven to be effective in improving their thermal performances. However, the influence of adding an insulation on the energy performance of rammed earth buildings in hot and arid climates remains to this day little explored. The present work comes in this order of ideas; it is based on a comparative study of the energetic performances of a mud building before and after the addition of the insulation. In order to compare between their performances, we have performed a simulation of the thermal behaviour of each by the dynamic thermal simulation software Design Builder.

Influence of HVOF Thermal Spray Process on the Microstructures and Properties of Fe-Based Amorphous / Nano Metallic Coatings

2009 ◽  
Vol 633-634 ◽  
pp. 685-694 ◽  
Author(s):  
X.Q. Liu ◽  
Y.G. Zheng ◽  
X.C. Chang ◽  
W.L. Hou ◽  
Jian Qiu Wang
Keyword(s):  
High Performance ◽  
Good Alternative ◽  
Metallic Coating ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Hvof Thermal Spray ◽  
Alternative Material ◽  
High Microhardness ◽  
Coating Microstructure ◽  
Hvof Thermal Spray Process

A new Fe-based amorphous / nano metallic coating with a good combination of high microhardness and excellent erosion corrosion resistance was produced by high velocity oxygen fuel (HVOF). The coating microstructure, amorphous phase content and properties under different HVOF processes were evaluated. It was found that they are very sensitive to the powder feed rate, stand-off distance and oxygen flow. This high performance amorphous / nano metallic coating could be applied as a good alternative material in erosion and corrosion environments.

Textile Drying Using Solar Process Steam

1979 ◽  
Author(s):  
M. E. Beesing
Keyword(s):  
High Temperature ◽  
Solar Energy ◽  
Steam Generator ◽  
Solar Collector ◽  
Drying Process ◽  
Parabolic Trough ◽  
Collector System ◽  
High Temperature Water ◽  
Process Heat ◽  
Temperature Water

This paper describes a solar energy collector system for providing process heat to a textile drying process in a WestPoint Pepperell mill in Fairfax, Alabama. The solar collector system uses 24 single axis tracking parabolic trough concentrating collectors to heat water in a high temperature water loop. The high temperature water fuels a steam generator to provide process steam. The process that was solarized is a textile drying process using cylindrical can dryers. The dryers are utilized in the slashing operation, a textile process where yarn is treated with sizing in preparation for weaving.

Dynamic Simulation Study on a Coal-Fired Power Plant Aided With Low-Temperature Solar Energy

2019 ◽  
Author(s):  
Xin Li ◽  
Yongliang Zhao ◽  
Ming Liu ◽  
Junjie Yan
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Solar Energy ◽  
Output Power ◽  
Large Scale ◽  
Solar Power ◽  
Flow Ratio ◽  
Design And Optimization ◽  
Collector System ◽  
Steam Extraction

Abstract The concept of coal-fired power generation aided with solar energy uses stable fossil energy to compensate the instability and intermittently of solar power and reduces the cost of concentrated solar power (CSP) by decreasing the large-scale heat storage and turbine systems of CSP. In this study, trough solar collector system (TSCS) was integrated into the low-pressure heater side of a 660 MW coal-fired power generation system. In the system in which the 6# LP heater is completely replaced by TSCS, the variation value of the steam extraction flowrate of the LP heaters and the turbine output power decrease with the reduction in loads from 100% to 60% THA, and the output power increases by approximately 1 MW under 100% THA. When TSCS completely replaces the 6# LP heater under the load of 75%, the effects of direct normal irradiance (DNI) increase and flow ratio decrease on the main operating parameters of solar-aided coal-fired power plant (SCPP) were studied. Results show that the step increase of DNI decreases the 5# steam extraction flowrate and increases the output power by nearly 3 MW. When the flow ratio decreases by 139.87 kg/s, the output power decreases by around 0.35 MW. The dynamic characteristics of SCPP under different parallel situations with the load of 75% were also studied. As the number of parallel stage increases, the decrement in 5# steam extraction flowrate and the increment in output power decrease. The response time also decreases. Our study aims to provide detailed references for the control system design and optimization of coal-fired power units aided with solar energy.

Alternative Material to be Applied in Oil Well Cementing Subjected to High Temperatures to Avoid Compressive Strength Retrogression

2019 ◽  
Author(s):  
Romero Gomes da Silva Araújo ◽  
Julio Cezar de Oliveira Freitas ◽  
Bruno Leonardo de Sena Costa ◽  
Paulo Henrique Silva Santos Moreira ◽  
Fabrício Pereira Feitoza da Silva ◽  
...  
Keyword(s):  
Compressive Strength ◽  
High Temperatures ◽  
Oil Well ◽  
Alternative Material

Optimal Utilization of Solar Arrays: Design and Implimentation of a Motorised Solar Energy Photovoltaic Array System

2009 ◽  
Vol 62-64 ◽  
pp. 533-536 ◽  
Author(s):  
E.U. Ubeku ◽  
S.O. Igbinovia
Keyword(s):  
Solar Cell ◽  
Solar Energy ◽  
Solar Panel ◽  
Stepper Motor ◽  
The Sun ◽  
Photovoltaic Array ◽  
Solar Arrays ◽  
Collector System ◽  
System A

In this paper a motorized solar energy collector system-a driver system that positioned the solar cell panel differently during day-time was design and implemented. The aim is to optimize the amount of solar energy that can be trapped from the sun using a solar cell panel. This is achieved by using a stepper motor, controlled by Atmel AT89C52 microcontroller, to align the panel such that all incident rays strike normal to the panel’s surface thereby maximizing the amount of solar energy that can be trapped from the sun. The alignment is time dependant. This model was implemented and tested and the results proved to be successful in maximizing the energy received from the sun than if the solar panel was fixed at a particular position.

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