- Member of the ASME, The American Society of Mechanical Engineers
- Member of ASHRAE, The American Society of Heating, Refrigerating and Air-Conditioning Engineers
- Member of CIBSE, Chartered Institution of Building Services Engineers
- Member of AIRAH, The Australian Institute of Refrigeration, Air Conditioning and Heating
- Member of SBSE, The Society for Building Science Educators
- Member of ausSCIG, Australian Solar Cooling Interest Group
Research Training Program (RTP) Scholarship
The UTS FEIT 2017 Technology Research Showcase People’s Choice Prize: Winner
- Thermal Comfort.
- Building Design for Energy Efficiency and Sustainability.
- Energy Efficiency and Energy Auditing in the Ventilation and air conditioning.
- Building Energy Simulation
- Energy Recovery Ventilation, Heat Recovery Ventilation and Indirect evaporative cooling.
- Heat Exchangers.
- Solar Thermal Cooling.
- Night Sky Radiation.
- Advanced Manufacturing and Prototyping.
- UTS 49316 Material Handling
- UTS 48621 Engineering Manufacturing
- UTS 49322 Air Conditioning
- UTS 48663 Advanced Manufacturing
Al-Zubaydi, AYT & Hong, G 2019, 'Experimental study of a novel water-spraying configuration in indirect evaporative cooling', Applied Thermal Engineering, vol. 151, pp. 283-293.View/Download from: Publisher's site
© 2019 Elsevier Ltd Indirect evaporative cooler (IEC) is a clean cooling device in development for air conditioning systems. It uses the water to partially replace the refrigerant and can be applied as a standalone cooling system or an energy recovery ventilation system. Driven by the concern about the sustainability, IEC has been required to reduce the power to operate and increase its capacity in order to reduce the energy consumption and increase the overall efficiency of the air condition system. The water distribution over the plate walls in the cooler is a key factor affecting the IEC performance and efficiency. This study investigates the effect of a novel suggested water spray configuration on the performance of a ventilation energy recovery IEC. Experiments were conducted to investigate three water spray modes: external spray, internal spray and mixed internal and external sprays. The results show that the mixed mode performs best and internal spraying mode performs better than the external spraying mode does in terms of the wet-bulb efficiency, cooling capacity and the COP of IEC. The mixed mode improves the performance further by increasing wettability.
Al-Zubaydi, AYT & Hong, G 2018, 'Experimental investigation of counter flow heat exchangers for energy recovery ventilation in cooling mode', International Journal of Refrigeration, vol. 93, pp. 132-143.View/Download from: Publisher's site
© 2018 Elsevier Ltd and IIR Ventilation heat recovery is a system that requires low power to operate and has a high capacity to reduce the energy consumption and increase the overall efficiency for air conditioning. This paper reports the experimental investigation of air-to-air heat exchangers employed for heat recovery ventilation in cooling mode. The two main objective of this research are to design, fabricate and testing two polymers heat exchangers of different plate geometries and to evaluate and compare the thermal performance two quasi-counter flow plate heat exchangers. The key aims were to evaluate the effect of the surface geometry of the plates heat exchanger on the performance parameters specified in ANSI/ASHRAE Standard 84 and ANSI/AHRI Standard 1060 and narrow the gap of the limited experimental comparison of polymers sensible heat exchanger in cooling mode. The experiments were conducted on two polymer heat exchangers, one with a flat plate and the other with a dimpled surface plate. The experimental results showed that the cooling capacity of the dimpled surface heat exchanger as ventilation heat recovery system in cooling mode was 50–60% better than that of the flat surface plate heat exchanger. In addition, the sensible efficiency of the dimpled surface heat exchanger was higher than that of the flat surface plates heat exchanger at lower air velocities and higher air initial temperatures. The highest COP was 6.6 achieved with dimpled surface heat exchanger under primary air operating temperature of 32.6 °C.
Al-Zubaydi, AYT & Dartnall, WJ 2014, 'Design and Modelling of Water Chilling Production System by the Combined Effects of Evaporation and Night Sky Radiation', Journal of Renewable Energy, vol. 2014, pp. 1-8.View/Download from: Publisher's site
The design and mathematical modelling of thermal radiator panel to be used primarily to measure night sky radiation wet coated surface is presented in this paper. The panel consists of an upper dry surface coated aluminium sheet laminated to an ethylene vinyl acetate foam backing block as an insulation. Water is sprayed onto the surface of the panel so that an evaporative cooling effect is gained in addition to the radiation effect; the surface of a panel then is wetted in order to study and measure the night sky radiation from the panel wet surface. In this case, the measuring water is circulated over the upper face of this panel during night time. Initial TRNSYS simulations for the performance of the system are presented and it is planned to use the panel as calibrated instruments for discriminating between the cooling effects of night sky radiation and evaporation.
Al-Zubaydi, AY 2013, 'Building Models Design And Energy Simulation With Google Sketchup And Openstudio', Journal of Advanced Science and Engineering Research, vol. 3, no. 4.
The necessity to approach the zero net building design and the improving of building thermal performance augmented the need to use the energy simulation programmes in order to estimate the building energy consumption and virtually modify the structure and the construction material. Energy Plus software from the US Department of Energy introduced a plug-in for Google SketchUp drawing software known as Open Studio, this tool can be considered as a free licences powerful simulation tool available for all engineers to estimate and modify the buildings energy consumption. In this paper we presented a step by step simulation procedure to explain the software capability and encourage the use of the tool by engineers interested in energy efficiency calculations
Al-Zubaydi, AY 2011, 'Solar air conditioning and refrigeration with absorption chillers technology in Australia–an overview on researches and applications', Journal of Advanced Science and Engineering Research, vol. 1, no. 1, pp. 23-41.
The air conditioning sector demand for energy has increased incessantly in Australia in the past few years due to global warming and the increase of life standards. This added more loads on the electricity demand and a significant increase in peak demand due to the use of conventional air conditioning systems, in addition to the environmental impact of energy producing from fossil fuels. Nevertheless, to minimise the environmental impact associated with air conditioning/ refrigeration system operation it is logical to evaluate the alternative options for energy sources and/or refrigerant systems. The solar assisted air conditioning /refrigeration system is presented as an attractive substance utilise the free, clean and sustainable solar energy. In this study, an overview of the different solar assisted air conditioning technologies available and their applications with a brief literature of the current related research and study in Australia, the review cover the solar thermal assisted cooling system (Absorption, Adsorption, Ejector systems, Desiccant cooling, thermo-mechanical) and the Solar electric cooling technology. From the study, the Solar cooling system applied Absorption chillers present as the most promising technology available.
Al-Zubaydi, AYT, Hong, G & Dartnall, WJ 2016, 'CFD Modelling and Analysis of Different Designs Plate Heat Exchangers', Proceedings of the 10th Australasian Heat and Mass Transfer Conference, Australasian Heat and Mass Transfer Conference, Queensland University of Technology, Brisbane, Australia, pp. 145-152.
The indirect evaporative cooling system and heat recovery system utilize the return (secondary) air to condition the fresh (primary) air by means of air-to-air heat exchange between the two streams. The temperature difference between the primary and secondary air streams in indirect evaporative cooling system is relatively small. Therefore, efficient heat exchangers should be used since they play a major role in the overall system performance and economics. The parallel plate type heat exchangers have been widely adopted in Indirect Evaporative Cooling (IEC) systems due to their high efficiency in operating at small temperature difference. In this paper we present a theoretical analysis of different designs of counter flow aluminium plate type heat exchanger and results of CFD analysis of pressure drop, flow velocity and thermal effectiveness. For improving the heat transfer between the plates and minimizing the energy loss, the analysis proves useful in the optimization method for selecting parameters of the plate heat exchangers.
Al-Zubaydi, AYT, Dartnall, J & Dowd, A 2012, 'Design, construction and calibration of an instrument for measuring the production of chilled water by the combined effects of evaporation and night sky radiation', ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), International Mechanical Engineering Congress and Exposition, ASME, Houston, Texas, USA, pp. 1523-1532.View/Download from: Publisher's site
This paper presents the design and mathematical modeling of thermal radiator panels to be used primarily to measure night sky radiation from dry and wet coated surfaces. Three panels may be used in conjunction as a combined measuring system. One panel consists of an upper dry surface coated aluminum sheet laminated to an ethylene vinyl acetate foam backing block having a pattern of parallel flow water channels and header channels milled into its mating surface prior to lamination to the aluminum sheet. This configuration provides a fin and channel radiator instrument whereby circulating water may be used to measure the heat loss from this panel to night sky radiation. In a second configuration, the surface of a panel without buried water channels but otherwise identical may be wetted in order to study and compare the night sky radiation from its wet surface. In this case, the measuring water is circulated over the upper face of this panel. In a third configuration, water is sprayed onto the surface of the second panel (or a similar panel) so that an evaporative cooling effect is gained in addition to the radiation effect. Initial TRNSYS simulations for the performance of all three configurations are presented and it is planned to use the panels as calibrated instruments for discriminating between the cooling effects of night sky radiation and evaporation. Copyright © 2012 by ASME.
Al-Zubaydi, AY 2013, 'Architectural modifications : performance assessment of the solar cooling system for a small size office building'.
Across the world, governments, organisations and individuals are seeking to obtain the most effective, cheapest and environmentally clean power sources. During the last decade, air conditioning systems that use renewable energies have undergone significant development. This expansion has been driven, in large part, by successive periods of extreme solar heat and increased demand for the comfort of summer air conditioning in residential and commercial buildings. Most of Australia's greenhouse gas emissions (about 50%) come from the burning of fossil fuels for energy (e.g., for electricity and transport). For this reason, looking for a reduction in the energy used in buildings as well as looking for alternative power sources to fossil fuels should be explored. This project presents approaches to increasing the performance of a solar cooling system by improving the energy efficiency of the building for a typical small-sized Australian office building in Sydney, New South Wales (NSW). Solar cooling systems with a thermally driven LiBr-H2O single-effect absorption chiller that utilises the solar thermal energy provided through evacuated tube solar thermal collectors and thermal back-up is a popular system among solar cooling applications around the world. In this study, the performance of a similar system is evaluated and compared with a conventional cooling system in terms of energy, economic and environmental aspects. The aim of this project was to examine a solar air conditioning system with absorption chiller contributions in a small office building cooled in different thermal efficiency scenarios by demonstrating and evaluating specific architectural improvements to the basic model of the building. These improvements took the form of double-glazed windows, overhanging window shades, and a combination of double-glazed windows and overhanging shades in the environment of Sydney, NSW. TRNSYS and OpenStudio/EnergyPlus software with the graphical interference of Goog...