Browsing by Author "Al-Khawaja, Mohammed"
Now showing items 1-20 of 24
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Analysis of novel regenerative thermo-mechanical refrigeration system integrated with isobaric engine
Sleiti, Ahmad K.; Al-Ammari, Wahib A.; Al-Khawaja, Mohammed ( American Society of Mechanical Engineers , 2021 , Article)Refrigerants of the conventional cooling systems contribute to global warming and ozone depletion significantly, therefore it is necessary to develop new cooling systems that use renewable energy resources and waste heat ... -
Analysis of the effect of global climate change on ground source heat pump systems in different climate categories
Mohamad, Kharseh; Altorkmany, Lobna; Al-Khawaja, Mohammed; Hassani, Ferri ( Elsevier , 2015 , Article)Ground source heat pump (GSHP) systems exhibit high thermal performance. Consequently, they are increasingly used to heat and cool buildings. The thermal performance of GSHP systems strongly depends on the operation ground ... -
A combined thermo-mechanical refrigeration system with isobaric expander-compressor unit powered by low grade heat – Design and analysis
Ahmad K., Sleiti; Al-Khawaja, Mohammed; Al-Ammari, Wahib A. ( Elsevier , 2020 , Article)Refrigeration and air conditioning systems consume about 17% of the world-wide electricity and their conventional refrigerants cause ozone depletion and global warming. In this study a novel thermo-mechanical refrigeration ... -
Comparison between different measures to reduce cooling requirements of residential building in cooling-dominated environment
Mohamad, Kharseh; Al-Khawaja, Mohammed; Hassani, Ferri ( Elsevier , 2014 , Article)In hot climate region like Arabian Peninsula, air conditioning systems are the major energy consumer. Therefore, there are compelling reasons to study the energy requirements in buildings sector to reduce the energy ... -
Computational Simulation Of Organic Rankine Cycle Retrofitted To Petroleum Well
Kharseh, Mohamad; Al-khawaja, Mohammed ( Hamad bin Khalifa University Press (HBKU Press) , 2014 , Conference Paper)Geothermal refers to existing heat energy in deep rock and sedimentary basins. Unlike other types of renewable energy resources, geothermal energy provides a stable source of energy as it can be exploited regardless of ... -
Digital Twin for Power Plants, Energy Savings and other Complex Engineering Systems
Sleiti, Ahmad K.; Kapat, Jayanta S.; Vesely, Ladislav; Al-Khawaja, Mohammed ( Qatar University Press , 2021 , Poster)Digital Twin (DT) is a digital representation of a machine, service, or production system that consists of models, information, and data used to characterize properties, conditions, and behavior of the system. Renewable ... -
Energy conversion of heat from abandoned oil wells to mechanical refrigeration - Transient analysis and optimization
Al-Khawaja, Mohammed; K. Sleiti, Ahmad; A. Al-Ammari, Wahib ( Elsevier , 2012 , Article)This study investigates the potential of using the geothermal energy from abandoned oils in a novel three-loop system; geothermal, power and cooling loops to produce cooling effect. The geothermal loop drives the power and ... -
Experimental Investigation of Innovative Thermal Mechanical Refrigeration System
Sleiti, Ahmad K.; Al-Ammari, Wahib A.; Al-Khawaja, Mohammed ( Qatar University Press , 2021 , Poster)The current electrical refrigeration and air condition systems are considered as one of the major sources for ozone depletion and global warming problems. Furthermore, they consume a large percentage of the worldwide gross ... -
Experimental investigation on the performance of a novel thermo-mechanical refrigeration system driven by an expander-compressor unit
Ahmad K., Sleiti; Al-Ammari, Wahib A.; Al-Khawaja, Mohammed; Saker, Ahmad T. ( Elsevier , 2022 , Article)Operating thermos-mechanical refrigeration (TMR) ejector-based and organic Rankine cycle-based refrigeration systems at ultra-low temperature heat source (60 °C to 100 °C) is challenging and limited by their low coefficient ... -
Ground response to global warming
Kharseh, Mohamad; Al-Khawaja, Mohammed ( Springer Verlag , 2016 , Article)Owing to the awareness of the impact of global warming, there has been a growing interest in studying the relationship between the climatic changes and human activities. An increased global mean air temperature leads to ... -
Integrated novel solar distillation and solar single-effect absorption systems
Ahmad K., Sleiti; Al-Ammari, Wahib A.; Al-Khawaja, Mohammed ( Elsevier , 2021 , Article)Novel hybrid single-slope solar distillation systems integrated with single-effect solar absorption cooling system are designed, analyzed and optimized for production of cooling effect and freshwater, simultaneously. The ... -
Laboratory-scale pull-out tests on a geothermal energy pile in dry sand subjected to heating cycles
Elzeiny, Rehab; Suleiman, Muhannad T.; Xiao, Suguang; Qamar, Mu’Ath Abu; Al-Khawaja, Mohammed ( National Research Council of Canada , 2020 , Article)Ground source heat pumps coupled with energy piles operate intermittently, subjecting the piles to temperature cycles throughout their lifetime. The research presented in this paper focuses on studying the thermomechanical ... -
Modified-thermal borehole shear test device and testing procedure to investigate the soil-structure interaction of energy piles
Xiao, Suguang; Suleiman, Muhannad T.; Naito, Clay; Al-Khawaja, Mohammed ( ASTM International , 2017 , Article)The intermittent operation of heat pumps connected to energy piles causes cyclic variation of temperature in the pile and surrounding soil, affecting the soil-pile interaction in ways that have not been fully investigated ... -
Novel solar driven cooling system integrated with solar still system
Sleiti, Ahmad K.; Al-Ammari, Wahib A.; Al-Khawaja, Mohammed ( Qatar University Press , 2020 , Poster)Novel integrated solar cooling and solar distillation system is introduced to meet the high cooling and fresh water demands in hot and arid regions such as Qatar. The system is composed of a solar-driven ejector cooling ... -
A novel solar integrated distillation and cooling system – Design and analysis
Ahmad K., Sleiti; Al-Ammari, Wahib A.; Al-Khawaja, Mohammed ( Elsevier , 2020 , Article)To meet the high cooling and fresh water demands in hot and arid regions, a novel integrated solar cooling and solar distillation system is introduced. The system consists of a solar ejector cooling system integrated with ... -
Optimization of energy pile conductance using finite element and fractional factorial design of experiment
Ahmed, Khaled; Al-Khawaja, Mohammed; Suleiman, Muhannad ( Springer Verlag , 2019 , Book chapter)In Ground Source Heat Pumps (GSHP), Energy Piles pose as heat exchangers that transfer the heat from the buildings to the shallow ground lower temperature in order to decrease the energy consumption whilst cooling the ... -
Potential of ground source heat pump systems in cooling-dominated environments: Residential buildings
Mohamad, Kharseh; Al-Khawaja, Mohammed; Suleiman, Muhannad T. ( Elsevier , 2015 , Article)For countries in the Arabian Peninsula, air conditioning (A/C) systems account for 65% of the energy consumption, all of which comes from fossil fuel. Given the preparation for the 2022 World Cup, which will be held in ... -
Retrofitting measures for reducing buildings cooling requirements in cooling-dominated environment: Residential house
Kharseh, Mohamad; Al-Khawaja, Mohammed ( Elsevier Ltd , 2016 , Article)Air conditioning systems in hot and developing countries are the major energy consumers. Unfortunately, Arabian Peninsula countries still rely completely on fossil fuel. Therefore, there are compelling reasons to investigate ... -
Review of innovative approaches of thermo-mechanical refrigeration systems using low grade heat
Sleiti, Ahmad K.; Al-Ammari, Wahib A.; Al-Khawaja, Mohammed ( Hindawi , 2020 , Article)Cooling and refrigeration systems consume around 17% of the world-wide electricity. Enhancing the performance of these systems, using renewable energy resources and waste heat recovered from industrial processes, will lead ... -
Solar Energy For More Eco-friendly Mosque In Qatar
Kharseh, Mohamad; Al-Khawaja, Mohammed; Abdu Ghani, Saud ( Hamad bin Khalifa University Press (HBKU Press) , 2014 , Conference Paper)There is mounting evidence that the global warming and, consequently, the climate changes are anthropogenic and attributed to fossil fuel consumption. Therefore, it is mandatory to find alternative solutions that can replace ...