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RISS 인기검색어
- 검색키워드
- 저자 : Ammar Abbas Ali (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Behavior of Box Concrete-Filled Steel Tube Columns Considering Confinement Effect
Ammar Abbas Ali,Nazar Jabbar Abbas 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3
In recent years considerable attention has been given to estimating the strength of box concrete-fi lled steel tube (CFST) stub columns. The eff ect of confi ning pressures is one of the complexities in determining the ultimate strength of the CFST columns. An experimental database of 188 tested columns has been used to produce two types of formulae: modifi ed and simplifi ed, that can help to predict the ultimate strength of box CFST columns with a wide range of geometrical and material properties. Diff erent code procedures and previous formulae given by other authors were used for verifi cation purposes and to show reliability. The axial load-shortening behaviors of composite columns were plotted using a proposed model of confi ned concrete adopted in a fi nite element analysis and compared with the experimental results. It has been found that the present formulae and concrete model have given results that agree quite well with the results of the experimental tests.
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Performance evaluation of novel solarpowered domestic air cooler with Peltier modules
Zafar Abbas,A. N. Shah,M. Tahir Hassan,M. Sarfraz Ali,Qamar ud Din,Bilal Naseem,Ammar Asghar,Ali Haider 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11
Shifting of air conditioning and ventilation plants from conventional to renewable energy systems is one of the effective ways to save energy and attain sustainability. In this experimental study, an effort has been made to design, fabricate, and evaluate the cooling performance of a solar-powered domestic air cooler with Peltier plates to meet the comfort criteria as per ASHRAE standards. It also investigates the effect of Peltier modules on the performance of conventional room air cooler. The experiments were conducted in a 12x12 room with one, two, three, and four Peltier modules operating at various ambient temperatures. The experiments were repeated three times at specified conditions. Peltier effect was used to decrease water temperature, and subsequently cooled water was used to decrease the temperature of the air after coming in contact with this water. The cooled air was then used to create a comfort zone. The results indicated a decrease in temperature of the experimental zone by 5 %, 13 %, 19 %, and 23 % using one, two, three, and four Peltier modules respectively. The increase in relative humidity was recorded as 5 % at 27 °C temperature of the experimental zone. The results of energy analysis showed a substantial amount of energy savings in this study and suggest that more than 200 MW energy can be saved by replacing conventional electric air coolers all over the country with proposed Peltier based domestic solar powered air cooler.
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