Researches of Impact of Ionizing Radiation on Some Characteristics of Diesel Fuel
Lala Cabbarova,
Islam Mustafayev
Issue:
Volume 2, Issue 3, September 2017
Pages:
41-45
Received:
7 June 2017
Accepted:
27 June 2017
Published:
27 July 2017
DOI:
10.11648/j.jeece.20170203.11
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Abstract: As the object of study used samples of diesel fuel from the oil of Azerbaijan. Laboratory studies conducted on Сo60 gamma-source at dose rate of Р= 0.18 Gy/s at different absorbed doses D=15-150 kGy. The results of chromatographic, IR-spectroscopic studies are given. Concentrations, radiation-chemical yields of the obtained gases are established. Defined iodine number, viscosity, density before and after irradiation at various absorbed doses of fuel samples and measured their radiation resistance. The methods applied to determination of radiation stability are based on radiation of a product and the subsequent determination of the changes which happened in it. Impact of radiation on operational characteristics of fuels in static conditions on a regular technique before radiation was researched. Radiation oxidations of processes considered in the field of low temperatures when chain processes don't happen. The purpose of this work is the research of radiation firmness of fuels from oils of Azerbaijan. Results of such researches allow to estimate radiation stability of fuels, to find out influence of irradiation on general composition of fuels and possible changes of qualities of fuels.
Abstract: As the object of study used samples of diesel fuel from the oil of Azerbaijan. Laboratory studies conducted on Сo60 gamma-source at dose rate of Р= 0.18 Gy/s at different absorbed doses D=15-150 kGy. The results of chromatographic, IR-spectroscopic studies are given. Concentrations, radiation-chemical yields of the obtained gases are established. D...
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A Review on Solar Tracking Systems and Their Classifications
Issue:
Volume 2, Issue 3, September 2017
Pages:
46-50
Received:
11 June 2017
Accepted:
4 July 2017
Published:
1 August 2017
DOI:
10.11648/j.jeece.20170203.12
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Abstract: The output power produced by high concentration solar thermal and photovoltaic systems is directly related to the amount of solar energy acquired by the system. Therefore, it is necessary to track the sun’s position with a high degree of accuracy. This can be achieved by the system called solar tracking system. Solar tracking system is the most common method of increasing amount of solar radiation from the sun to the solar collectors either Flat plate or concentrated collectors. The main objective of this research is to review different tracking mechanisms for solar tracking system, 18 papers were reviewed. The result showed that solar tracking system can either be dual axis or single axis trackers depending on freedom degree of motion. Dual axis trackers are the best option for places where the position of the sun keeps changing during the year at different seasons. Single axis trackers are a better option for places around the equator where there is no significant change in the apparent position of the sun.
Abstract: The output power produced by high concentration solar thermal and photovoltaic systems is directly related to the amount of solar energy acquired by the system. Therefore, it is necessary to track the sun’s position with a high degree of accuracy. This can be achieved by the system called solar tracking system. Solar tracking system is the most com...
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Exergy Flow Destruction of an Ice Thermal Energy Storage Refrigeration Cycle
Badr Habeebullah,
Majed Alhazmy,
Nedim Turkmen,
Rahim Jassim
Issue:
Volume 2, Issue 3, September 2017
Pages:
51-61
Received:
19 July 2017
Accepted:
1 August 2017
Published:
25 August 2017
DOI:
10.11648/j.jeece.20170203.13
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Abstract: A computational model based on exergy analysis of optimization of an ice-on coil thermal energy storage refrigeration cycle is developed in this paper. The method is based on exergy destruction analysis and optimization. As there are single and/or two phase refrigerant streams involved in the heat transfer and pressure drop in the compressor, condenser, expansion valve, evaporator, and between the ice tank and the environment, then there are irreversibilities or exergy destruction due to finite temperature difference and due to pressure losses. These two irreversibilities which represent the principles of components of the total irreversibilities are not independent and there is a trade-off between them. In this paper the effects of pressure drop ratio (PDR) in the evaporator and the condenser on the total number of exergy destruction units and the exergetic efficiency of a refrigeration cycle are determined. The pressure drop irreversibility to the total irreversibility for ΔPcond =25 → 100 kPa and PDR =1 are determined to be 7.45% → 27.08%.
Abstract: A computational model based on exergy analysis of optimization of an ice-on coil thermal energy storage refrigeration cycle is developed in this paper. The method is based on exergy destruction analysis and optimization. As there are single and/or two phase refrigerant streams involved in the heat transfer and pressure drop in the compressor, conde...
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