Case studies in industry and services
Nabil Beithou; Zaid Abu Al-Ganam
Abstract
Energy is a main factor in developing nations. Energy is almost a must for surviving with dignity. Palestine situation is different from other countries which can import their energy needs from outside. Palestinians are facing a critical shortage in energy due to Israeli Occupation. They must depend ...
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Energy is a main factor in developing nations. Energy is almost a must for surviving with dignity. Palestine situation is different from other countries which can import their energy needs from outside. Palestinians are facing a critical shortage in energy due to Israeli Occupation. They must depend on the naturally available energy to survive in dignity and develop their lives. In this paper, the scope of using geothermal energy in Palestine is taken into consideration, its availability and practical applications, as a source of renewable energy, which is identified by the reliability and sustainability. It has been found that the Palestinians should depend on their own free energy; geothermal energy has a notable role in reducing the residential energy consumption especially for the heating and cooling purposes. Geothermal energy could also be used to reduce the electrical bill that overloading the Palestinians shoulders by using low temperature geothermal water in generating electricity.
Thermal Comfort
Abdullah. N. Olimat; Ahmed Al-Salaymeh; Ayman Al-Maaitah
Abstract
Experimental analysis of thermal properties of phase change material was conducted using DCS and TG apparatus. Moderate rang of temperature of phase change material was selected and experimentally investigated. Measurement of melting and solidification temperature at several heating rate are carried ...
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Experimental analysis of thermal properties of phase change material was conducted using DCS and TG apparatus. Moderate rang of temperature of phase change material was selected and experimentally investigated. Measurement of melting and solidification temperature at several heating rate are carried out. Furthermore, the stability and thermal decomposition of the selected phase change material are also investigated. Experiment demonstrates clearly the phase change material effect in melting and solidification. The lab test with DSC and TG proves that the catalogue data of the Plus ICE H190 PCM is reasonable to be used for thermal storage devices with great deal of consistency. In general, results showed that the utilization of phase change material in thermal storage is feasible to store and extract heat at constant temperature in the range between 170oC to 200oC which has many applications in engineering and industry.
Thermal Comfort
Ubeidulla F. Al-Qawabeha
Abstract
AISI H13 tool steel is applied widely to produce many kinds of hot work dies, such as forging dies, extrusion dies, die-casting dies and so on. The successful employment of metal in engineering application relies on the ability of the metal to meet design and services requirements and to be fabricated ...
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AISI H13 tool steel is applied widely to produce many kinds of hot work dies, such as forging dies, extrusion dies, die-casting dies and so on. The successful employment of metal in engineering application relies on the ability of the metal to meet design and services requirements and to be fabricated to the proper dimensions. The capability of metal to meet these requirements is determined by mechanical and physical properties of the metal. Burnishing processes is considered as a surface plastic deformation method, which used to improve surface texture (micro hardness, average surface roughness, and maximum surface roughness). This work present the effect of isothermal annealing temperature and roller burnishing process on the surface properties of H13 alloy steel .This steel was annealed at a different temperatures to get different types of pearlite with different grains and grain size. After that, the steel was burnished with different forces, feeds, and burnishing speeds. The effect of annealing temperatures and roller burnishing on the hardness, micro hardness, average surface roughness and microstructure and metallographic analysis have been investigated. The results showed that roller burnishing could increase the surface hardness under the selected specified conditions depending on the isothermal annealing temperatures by 104%, 45% and 90% for the work parts with 3000C, 500 0C and 6200C annealing temperatures respectively. In addition, roller burnishing significantly improves the smoothness of the steel surfaces. The average roughness obtained was ranged from 0.11μm to 0.17μm. In this paper, the microstructure analysis, micrograph of the isothermal annealed H13 alloy steel have been given. It has been shown that depending on the isothermal annealing temperature there are different types of grains and grain size of treated steel in pearlite phase.
