An-Najah National University

Abu-Hilal

 

 
  • Saturday, October 1, 2011
  • Experimental Energy Study for Domestic Hot Water Storage Tanks
  • Published at:Jordan Journal of Mechanical and Industrial Engineering
  • In the last decade, energy and water become the most important commodities as the world is suffering from a critical shortage in water and energy. Researchers are working hard on renewable energy, and energy saving. In this paper, an experimental study of the usable energy for domestic hot water storage tank was performed. Different supply features and different flow rates have been considered. To save energy in the storage tank, the turbulent mixing must be eliminated. In this study a cover over the supply lines was imposed. It has been found that the cover for the side supply feature improves the temperature distributions in the tank. For the bottom supply feature investigations indicated important improvement in the total usable hot water. Approximately 17% saving in usable hot water was achieved by using a round curved cover on the bottom supply line. The achieved saving in energy and hot water will help in reducing the consumed energy in residential buildings and thus keep us in a better environment.
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  • Wednesday, February 2, 2011
  • Thermal Analysis of Discrete Water supply in Domestic Hot Water Storage Tank
  • Published at:Jordan Journal of Mechanical and Industrial Engineering
  • Energy and water are very important commodities to human life. The world is suffering from a critical shortage in water and energy; the researchers must work hard to find sources of potable water and renewable energy. Energy and water saving techniques have a great importance especially in this transmission period. In this paper analyses were done for discrete water supply in hot water storage tanks, aiming to reduce energy and water losses. The analyses were based on an experimental study for the temperature distribution in the hot water storage tank for different flow rates and off periods, 3, 6, and 9 L/min, and 5, 10, and 15 minutes were considered for flow rates and off periods respectively. It has been found that increasing the hot water consumption rate reduces the total delivered hot water to the consumer. The analyses indicated increase in the usable hot water for small and medium off periods. This increase results in water and energy saving for the consumer.

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  • Tuesday, February 1, 2011
  • Evaluating Thermal Performance of Solar Cookers under Jordanian Climate
  • Published at:Jordan Journal of Mechanical and Industrial Engineering
  • This study presented a short review on the solar cooker designs and applications. Two designs of cookers were tested. The first type has a painted black base and second has internal reflecting mirrors. These designs were examined under two modes of operations: at fixed position and on tracking system. The cooker at a fixed position had recorded thermal efficiencies ranging from 17 % to a sharp peak of 41.2% at the maximum solar intensity of the day around 11-12 am with an average overall efficiency around 27.6%. Whereas, cooker with internal reflecting mirrors installed on a sun tracking system gave higher water and pot temperatures, and thermal efficiency ranged from 25.3% to 53.1% with an average overall efficiency around 40.6 %. Cookers installed on sun tracking system had the advantage of maintaining a higher and closer range of thermal efficiencies through the daylight than the ones at fixed positions.

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  • Saturday, January 1, 2011
  • Proposed Energy Saving Techniques for Multi-Apartment Buildings
  • Published at:Int. J. of Thermal & Environmental Engineering,Volume 3, No. 1(2011) 27-36
  • During the last decade and as a result of the significant increase in the population of Jordan, multi-apartment buildings
    became the most dominant building format, especially in Amman the capital of Jordan. The lack of well-developed
    passive heating, cooling and energy saving solutions, made the reliance on central heating in winter and air conditioners
    in summer the prominent choice for residents. The sustained significant increase in the use of these high energyconsuming
    systems, have started to exert a heavy toll on the national economy and have raised environmental and public
    health concerns. This study is devoted to the analysis of heating and cooling problems in the new multi-apartment
    buildings in Jordan. The main focus of this study is to minimize fuel and electricity consumption. Techniques for heating
    and cooling are proposed. This study shows that the proposed techniques will lead to significant savings in total energy
    consumption. These sav
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  • Wednesday, September 29, 2010
  • Thermal Analysis of Discrete Water Supply in Domestic
  • Published at:Proceeding of The Seventh Jordanian International Mechanical Engineering Conference 27-29/9/2010.Paper No. 1569320448
  • Energy and water are very important commodities to human life. The world is
    suffering from a critical shortage in water and energy; the researchers must work hard to
    find sources of potable water and renewable energy. Energy and water saving
    techniques has a great importance especially in this transmission period. In this paper
    analyses were done for discrete water supply in hot water storage tanks, aiming to
    reduce energy and water losses. The analyses were based on an experimental study for
    the temperature distribution in the hot water storage tank for different flow rates and off
    periods, 3, 6, and 9 lpm, and 5, 10, and 15 minutes were considered for flow rates and
    off periods respectively. It has been found that increasing the hot water consumption
    rate reduces the total delivered hot water to the consumer. The analyses indicated
    increase in the usable hot water for small and medium off periods. This increase results
    in water a
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PROFILE

Prof. Dr.-Ing. Mohammed Abu-Hilal
Applied Mechanics, Mechanical Vibration
 
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