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Magnetic refrigeration is a fascinating superior choice technology as compared with traditional refrigeration that relies on a unique property of particular materials, known as the magnetocaloric effect (MCE). This paper provides a thorough understanding of different magnetic refrigeration technologies using a variety of models to evaluate the coefficient of performance (COP) and specific cooling capacity outputs. Accordingly, magnetic refrigeration models are divided into four categories: rotating, reciprocating, C-shaped magnetic refrigeration, and active magnetic regenerator. The working principles of these models were described, and their outputs were extracted and compared. Furthermore, the influence of the magnetocaloric effect, the magnetization area, and the thermodynamic processes and cycles on the efficiency of magnetic refrigeration was investigated and discussed to achieve a maximum cooling capacity. The classes of magnetocaloric magnetic materials were summarized from previous studies and their potential magnetic characteristics are emphasized. The essential characteristics of magnetic refrigeration systems are highlighted to determine the significant advantages, difficulties, drawbacks, and feasibility analyses of these systems. Moreover, a cost analysis was provided in order to judge the feasibility of these systems for commercial use.
Ali Alahmer; Malik Al-Amayreh; Ahmad Mostafa; Mohammad Al-Dabbas; Hegazy Rezk. Magnetic Refrigeration Design Technologies: State of the Art and General Perspectives. Energies 2021, 14, 4662 .
AMA StyleAli Alahmer, Malik Al-Amayreh, Ahmad Mostafa, Mohammad Al-Dabbas, Hegazy Rezk. Magnetic Refrigeration Design Technologies: State of the Art and General Perspectives. Energies. 2021; 14 (15):4662.
Chicago/Turabian StyleAli Alahmer; Malik Al-Amayreh; Ahmad Mostafa; Mohammad Al-Dabbas; Hegazy Rezk. 2021. "Magnetic Refrigeration Design Technologies: State of the Art and General Perspectives." Energies 14, no. 15: 4662.
The effect of different Ca-based additives in lignite on the sulfur removal during combustion has been examined using two Polish lignites. After demineralization, the lignite was loaded with Ca using different Ca-based compounds namely: calcium carbonate (CaCO3), calcium hydroxide Ca(OH)2 and calcium acetate Ca(CH3COO)2. Depending on the calcium compound used, the addition of Ca was by mechanical mixing or impregnation. The experiment was carried out in a laboratory scale drop-tube furnace reactor, under different O2 concentration and temperature range of 800–1100 °C. The results showed that Ca added to the lignite strongly suppressed the emission of SO2 under experimental conditions studied. The sulfur capture efficiency appeared to be independent of the calcium compound used and it increased along with the temperature rising up to 1100 °C. This may indicate that poorly dispersed Ca, prepared by mechanical mixing, offers as high efficiency in sulfur removal as Ca in ion-exchangeable form inserted by impregnation. The influence of mineral matter on the retention of SO2 during combustion was also investigated. It was found that some inorganic species inherently present in lignite, particularly calcium in natural form, reduce SO2 pollution.
Wojciech Zacharczuk; Artur Andruszkiewicz; Andrzej Tatarek; Ali Alahmer; Sameh Alsaqoor. Effect of Ca-based additives on the capture of SO2 during combustion of pulverized lignite. Energy 2021, 231, 120988 .
AMA StyleWojciech Zacharczuk, Artur Andruszkiewicz, Andrzej Tatarek, Ali Alahmer, Sameh Alsaqoor. Effect of Ca-based additives on the capture of SO2 during combustion of pulverized lignite. Energy. 2021; 231 ():120988.
Chicago/Turabian StyleWojciech Zacharczuk; Artur Andruszkiewicz; Andrzej Tatarek; Ali Alahmer; Sameh Alsaqoor. 2021. "Effect of Ca-based additives on the capture of SO2 during combustion of pulverized lignite." Energy 231, no. : 120988.
A concentrating solar power (CSP) unit was designed to work as a hybrid system to supply the required energy for heat water and high intensity light. The system consists of a parabolic solar dish that reflected light in a set of optical fiber light inside a receiver. In turn, this light was transmitted to an indoor photovoltaic (PV) panels to produce electrical energy or used directly as a source of light during the day. This study revealed the following points: (i) the increased number of fiber optics, the improved efficiency of solar panel and power generated; (ii) the efficiency of the hybrid solar system was 23.62%. (iii) when the separation distance between the fiber optics and the PV module was closed, the level of the power generated becomes higher; and finally; (v) this application is more suitable for a limited area in the roof of the building.
Malik I. Al-Amayreh; Ali Alahmer; Ahmad Manasrah. A novel parabolic solar dish design for a hybrid solar lighting-thermal applications. Energy Reports 2020, 6, 1136 -1143.
AMA StyleMalik I. Al-Amayreh, Ali Alahmer, Ahmad Manasrah. A novel parabolic solar dish design for a hybrid solar lighting-thermal applications. Energy Reports. 2020; 6 ():1136-1143.
Chicago/Turabian StyleMalik I. Al-Amayreh; Ali Alahmer; Ahmad Manasrah. 2020. "A novel parabolic solar dish design for a hybrid solar lighting-thermal applications." Energy Reports 6, no. : 1136-1143.
The main purpose of any vehicular climatic control in terms of heating and air conditioning (AC) systems is to achieve maximum thermal human comfort with energy efficient. Therefore, it is important to analyse the temperature distribution and air-flow field in the cabin compartment to achieve the highest and rapid human comfort. This paper adopted a Berkeley human comfort model to show the behaviour of a vehicular human sensation and comfort at different airflow velocity levels. A temporal history, local sensation (LS), and comfort (LC) were analysed for different body segments with the addition of the overall sensation (OS) and the overall comfort (OC) inside the passenger compartment under summer period weather conditions. This study revealed that: because of the air velocity plays crucial impacts on both convection and evaporation mechanisms which directly effects on the heat losses from the body and thermal human comfort, the controlling of air movement with the temperature helps the environmental cabin to achieve the comfort zone faster than the sole control of the temperature only. When activated the air conditioning systems, the vehicular environmental parameters will change dramatically and a rapid transient occurred especially in the first few minutes.
Ali Alahmer. Assessment of local and overall vehicular thermal human comfort and sensation states for transient, non- uniform conditions under variant air velocity levels. Australian Journal of Mechanical Engineering 2020, 1 -9.
AMA StyleAli Alahmer. Assessment of local and overall vehicular thermal human comfort and sensation states for transient, non- uniform conditions under variant air velocity levels. Australian Journal of Mechanical Engineering. 2020; ():1-9.
Chicago/Turabian StyleAli Alahmer. 2020. "Assessment of local and overall vehicular thermal human comfort and sensation states for transient, non- uniform conditions under variant air velocity levels." Australian Journal of Mechanical Engineering , no. : 1-9.
Frosting and fogging of automobile windshields is a common problem that emerges in daily driving. It is important and essential to quickly and completely defrost the windshield for safety purposes. In this study, a three-dimensional mathematical model was applied to investigate the flow distribution and flow characteristics on the windshield of a medium-size Model N800 truck. The simulation results were first compared with experimental data. The results showed that the simulation model could reliably predict the defrosting performance on the windshield. This model was then used to optimize the design of the defrosting duct that comprised the main part of the defroster. It was found that the guide plate and outlet position of the defrosting duct were the two major factors affecting the defrosting performance. Therefore, the guide plate was first optimized and the defrosting performance was analyzed. The results showed that the average pressure loss dropped by 21.56%, while the defrosting efficiency at the front white zone was improved to 89%. The position of the outlet of the airflow was further studied. The results showed that the defrosting efficiency at the front zone could be further improved to 99%.
Zhilong He; Xide Qu; Lantian Ji; Weifeng Wu; Xiaolin Wang. Analysis and Optimization of Truck Windshield Defroster. Applied Sciences 2020, 10, 5671 .
AMA StyleZhilong He, Xide Qu, Lantian Ji, Weifeng Wu, Xiaolin Wang. Analysis and Optimization of Truck Windshield Defroster. Applied Sciences. 2020; 10 (16):5671.
Chicago/Turabian StyleZhilong He; Xide Qu; Lantian Ji; Weifeng Wu; Xiaolin Wang. 2020. "Analysis and Optimization of Truck Windshield Defroster." Applied Sciences 10, no. 16: 5671.
This work presents performance study of a concentrating photovoltaic/thermal (CPV/T) collector and its efficiency to produce electric and thermal power under different operating conditions. The study covers a detailed description of flat photovoltaic/thermal (PV/T) and CPV/T systems using water as a cooling working fluid, numerical model analysis, and qualitative evaluation of thermal and electrical output. The aim of this study was to achieve higher efficiency of the photovoltaic (PV) system while reducing the cost of generating power. Concentrating photovoltaic (CPV) cells with low-cost reflectors were used to enhance the efficiency of the PV system and simultaneously reduce the cost of electricity generation. For this purpose, a linear Fresnel flat mirror (LFFM) integrated with a PV system was used for low-concentration PV cells (LCPV). To achieve the maximum benefit, water as a coolant fluid was used to study the ability of actively cooling PV cells, since the electrical power of the CPV system is significantly affected by the temperature of the PV cells. This system was characterized over the traditional PV systems via producing more electrical energy due to concentrating the solar radiation as well as cooling the PV modules and at the same time producing thermal energy that can be used in domestic applications. During the analysis of the results of the proposed system, it was found that the maximum electrical and thermal energy obtained were 170 W and 580 W, respectively, under solar concentration ratio 3 and the flow rate of the cooling water 1 kg/min. A good agreement between the theoretical and experimental results was confirmed.
Mohamed R. Gomaa; Mujahed Al-Dhaifallah; Ali Alahmer; Hegazy Rezk. Design, Modeling, and Experimental Investigation of Active Water Cooling Concentrating Photovoltaic System. Sustainability 2020, 12, 5392 .
AMA StyleMohamed R. Gomaa, Mujahed Al-Dhaifallah, Ali Alahmer, Hegazy Rezk. Design, Modeling, and Experimental Investigation of Active Water Cooling Concentrating Photovoltaic System. Sustainability. 2020; 12 (13):5392.
Chicago/Turabian StyleMohamed R. Gomaa; Mujahed Al-Dhaifallah; Ali Alahmer; Hegazy Rezk. 2020. "Design, Modeling, and Experimental Investigation of Active Water Cooling Concentrating Photovoltaic System." Sustainability 12, no. 13: 5392.
The energy demand for cooling and air conditioning systems is increasing worldwide, especially in regions with high solar radiation intensity. One of the reasons for this is the increase of comfort demands worldwide. The most cooling and air conditioning systems are the conventional electrically driven one type such as compression refrigeration machines and air conditioning systems. Through the huge electricity consumption for cooling and air conditioning, the environmental problems get bigger and bigger, because of carbon dioxide (CO2) and other pollutant emissions. One of the possibilities to reduce the primary energy consumption is through the use of solar energy for driving the thermal driven absorption or adsorption refrigeration systems, or desiccant cooling. Another possibility is using solar energy to produce electrical energy and this can be used to drive the conventional refrigeration systems. Many research and developmental efforts in the last years have been done to enforce the spreading of solar-driven cooling systems. This paper will illustrate the state of the art about the energy consumption for cooling and air conditioning systems, available solar-driven cooling systems and the potential of the utilization of such systems in comparison to the conventional ones. Moreover, this paper highlights some different methods of optimization, which used to maximize the performance and minimize the cost.
Ali Alahmer; Salman Ajib. Solar cooling technologies: State of art and perspectives. Energy Conversion and Management 2020, 214, 112896 .
AMA StyleAli Alahmer, Salman Ajib. Solar cooling technologies: State of art and perspectives. Energy Conversion and Management. 2020; 214 ():112896.
Chicago/Turabian StyleAli Alahmer; Salman Ajib. 2020. "Solar cooling technologies: State of art and perspectives." Energy Conversion and Management 214, no. : 112896.
Performance assessment of a two-bed silica gel-water adsorption refrigeration system driven by solar thermal energy is carried out under a climatic condition typical of Perth, Australia. A Fourier series is used to simulate solar radiation based on the actual data obtained from Meteonorm software, version 7.0 for Perth, Australia. Two economic methodologies, Payback Period and Life-Cycle Saving are used to evaluate the system economics and optimize the need for solar collector areas. The analysis showed that the order of Fourier series did not have a significant impact on the simulation radiation data and a three-order Fourier series was good enough to approximate the actual solar radiation. For a typical summer day, the average cooling capacity of the chiller at peak hour (13:00) is around 11 kW while the cyclic chiller system coefficient of performance (COP) and solar system COP are around 0.5 and 0.3, respectively. The economic analysis showed that the payback period for the solar adsorption system studied was about 11 years and the optimal solar collector area was around 38 m2 if a compound parabolic collector (CPC) panel was used. The study indicated that the utilization of the solar-driven adsorption cooling is economically and technically viable for weather conditions like those in Perth, Australia.
Ali Alahmer; Xiaolin Wang; K. C. Amanul Alam. Dynamic and Economic Investigation of a Solar Thermal-Driven Two-Bed Adsorption Chiller under Perth Climatic Conditions. Energies 2020, 13, 1005 .
AMA StyleAli Alahmer, Xiaolin Wang, K. C. Amanul Alam. Dynamic and Economic Investigation of a Solar Thermal-Driven Two-Bed Adsorption Chiller under Perth Climatic Conditions. Energies. 2020; 13 (4):1005.
Chicago/Turabian StyleAli Alahmer; Xiaolin Wang; K. C. Amanul Alam. 2020. "Dynamic and Economic Investigation of a Solar Thermal-Driven Two-Bed Adsorption Chiller under Perth Climatic Conditions." Energies 13, no. 4: 1005.
Hospitals and other healthcare facilities are complex environments that require a special consideration to HVAC design as in requirement a large amounts of ventilation, which leads to high amount of energy consumption. This manuscript presents a description of chilled water/ HVAC systems for health care facilities. A case study of a Farah hospital located in Amman/ Jordan was implemented to perform cooling load using radiant time series (RTS). This paper manipulates the effect of changing relative humidity with dry bulb temperature on the cooling load, power consumption and chiller selection using three types of building namely: commercial building, hospital building and green hospital building to choose the best indoor design conditions with minimum power consumption. To reduce the energy cost for chiller, a solar photovoltaic was proposed to overcome the portion of the air conditioning power requirement and reduce the demand on the electrical grid. A proposed solar photovoltaic technology unit was analyzed and modeled using a hybrid optimization model for renewable energies (HOMER) software. The results revealed that: (i) the applying green building criterion will lead to significant reduction in cooling load and power consumption up to 25%; (ii) A higher relative humidity and in design inside temperature, a lower cooling load and power consumption required, (iv) PV systems sizing depend on load data, solar radiation, battery data, inverter data and investment cost of the system, and finally (v) there is a potential to adopt solar PV as strategic and alternative option to reduce the cooling cost.
Ali Alahmer; Sameh AlSaqoor. Energy efficient of Using Chilled Water System for Sustainable Health Care Facility Operating by Solar Photovoltaic Technology. Energy Procedia 2019, 156, 65 -71.
AMA StyleAli Alahmer, Sameh AlSaqoor. Energy efficient of Using Chilled Water System for Sustainable Health Care Facility Operating by Solar Photovoltaic Technology. Energy Procedia. 2019; 156 ():65-71.
Chicago/Turabian StyleAli Alahmer; Sameh AlSaqoor. 2019. "Energy efficient of Using Chilled Water System for Sustainable Health Care Facility Operating by Solar Photovoltaic Technology." Energy Procedia 156, no. : 65-71.
This chapter describes different available technologies to provide the cooling effect by utilizing solar energy for both thermal and photovoltaic ways. Moreover, this chapter highlights the following points: (i) the main attributes for different solar cooling technologies to recognize the main advantages, challenges, disadvantages, and feasibility analysis; (ii) the need for further research to reduce solar cooling chiller manufacture costs and improve its performance; (iii) it provides useful information for decision-makers to select the proper solar cooling technology for specific application. Furthermore, some references, which include investigation results, will be included. A conclusion about the main gained investigation results will summarize the investigation results and the perspectives of such technologies.
Salman Ajib; Ali Alahmer. Solar Cooling Technologies. Energy Conversion - Current Technologies and Future Trends 2019, 1 .
AMA StyleSalman Ajib, Ali Alahmer. Solar Cooling Technologies. Energy Conversion - Current Technologies and Future Trends. 2019; ():1.
Chicago/Turabian StyleSalman Ajib; Ali Alahmer. 2019. "Solar Cooling Technologies." Energy Conversion - Current Technologies and Future Trends , no. : 1.
Ali Alahmer; Sameh Alsaqoor. Simulation and optimization of multi-split variable refrigerant flow systems. Ain Shams Engineering Journal 2018, 9, 1705 -1715.
AMA StyleAli Alahmer, Sameh Alsaqoor. Simulation and optimization of multi-split variable refrigerant flow systems. Ain Shams Engineering Journal. 2018; 9 (4):1705-1715.
Chicago/Turabian StyleAli Alahmer; Sameh Alsaqoor. 2018. "Simulation and optimization of multi-split variable refrigerant flow systems." Ain Shams Engineering Journal 9, no. 4: 1705-1715.
Adsorption chiller technology has received much attention in the last few decades due to its advantages in utilizing low grade thermal energy and eco-friendly refrigerant. However, it has not been wide commercialized due to its low coefficient of performance (COP) and low specific cooling power (SCP) compared to conventional refrigeration technologies. This paper reviews different strategies to improve the COP and SCP of adsorption chillers. Heat recovery, mass recovery, multi-stage, multi-bed, improved adsorption structures and optimized operating conditions are discussed in this review. This study revealed that: (i) for operating conditions of low evaporative temperature, low generation temperature or high condensing temperature, a mass recovery technique is strongly recommended; (ii) in the case of intermittent cold production systems, use of constant temperature adsorption cooling cycle strategy is preferred; (iii) an appropriate cycle time and switching time are important to achieve the optimal system performance since the adsorption chiller performance is strongly dependent on the operating conditions; (iv) by employing a novel composite adsorbent material, along with improvements in heat exchanger design, advanced adsorption cycles can be a promising technology to improve adsorption chiller performance. This review highlights the need for further research to reduce chiller manufacture costs, increase power-to-mass ratio and improve understanding of dynamic long term chiller performance when driven by solar or waste thermal energy.
Ali Alahmer; Salman Ajib; Xiaolin Wang. Comprehensive strategies for performance improvement of adsorption air conditioning systems: A review. Renewable and Sustainable Energy Reviews 2018, 99, 138 -158.
AMA StyleAli Alahmer, Salman Ajib, Xiaolin Wang. Comprehensive strategies for performance improvement of adsorption air conditioning systems: A review. Renewable and Sustainable Energy Reviews. 2018; 99 ():138-158.
Chicago/Turabian StyleAli Alahmer; Salman Ajib; Xiaolin Wang. 2018. "Comprehensive strategies for performance improvement of adsorption air conditioning systems: A review." Renewable and Sustainable Energy Reviews 99, no. : 138-158.
Radiative properties of transparent insulations made of a layer of parallel, small-diameter, thin-walled, visible light transparent pipes placed perpendicularly to the surface of a flat solar absorber are investigated theoretically. A formula for the radiation heat losses through the insulation is derived based on two main assumptions: the system is in steady-state and the fourth power of the temperature along each pipe is linear. Arguments in favor of the assumptions are given. The formula, combined with standard formulas for the conductive heat flux, enables prediction that a 10 cm thick transparent insulation under insolation of 1000 W/m2, at ambient temperature 20 °C, could theoretically raise the absorber temperature to 429 °C and produce 410 W mechanical power under the ideal Carnot cycle. In order to reach that high energy conversion efficiency, the insulation pipes should have diameter less than 0.5 mm and walls about 5 μm thick, which may be technologically challenging.
Marek K. Lewkowicz; Sameh AlSaqoor; Ali Alahmer; Gabriel Borowski. Modeling and Optimization of Transparent Thermal Insulation Material. Journal of Solar Energy Engineering 2018, 140, 054501 .
AMA StyleMarek K. Lewkowicz, Sameh AlSaqoor, Ali Alahmer, Gabriel Borowski. Modeling and Optimization of Transparent Thermal Insulation Material. Journal of Solar Energy Engineering. 2018; 140 (5):054501.
Chicago/Turabian StyleMarek K. Lewkowicz; Sameh AlSaqoor; Ali Alahmer; Gabriel Borowski. 2018. "Modeling and Optimization of Transparent Thermal Insulation Material." Journal of Solar Energy Engineering 140, no. 5: 054501.
It presents a method to extract pure water from atmospheric air, which depends on intensifying the water vapor from the air. The plant was designed to perform the optimum levels to produce high quality water with minimal electricity consumption. The harvesting water was inspected and analyzed based on ISO/IEC 17025 method to check the purity of water. This study also investigates the potential of a solar powered using for atmospheric water generation (AWG) as a new option for fresh water production. A proposed solar AWG unit was assembled, analyzed and modeled using HOMER software. The results demonstrated that the water produced by the water extraction plant is pure, safe, economical, and acceptably tasting. It can be used as drinking water after treated by filter and disinfected by Ultra Violet Light (UV) technique. The feasibility analysis showed that there is a potential to adopt solar powered of AWG as strategic and alternative option for a small area; which is suffering from a shortage of drinking water.
A. Alahmer; M. Al-Dabbas; S. AlSaqoor; A. Al-Sarayreh. Utilizing of Solar Energy for Extracting Freshwater from Atmospheric Air. Applied Solar Energy 2018, 54, 110 -118.
AMA StyleA. Alahmer, M. Al-Dabbas, S. AlSaqoor, A. Al-Sarayreh. Utilizing of Solar Energy for Extracting Freshwater from Atmospheric Air. Applied Solar Energy. 2018; 54 (2):110-118.
Chicago/Turabian StyleA. Alahmer; M. Al-Dabbas; S. AlSaqoor; A. Al-Sarayreh. 2018. "Utilizing of Solar Energy for Extracting Freshwater from Atmospheric Air." Applied Solar Energy 54, no. 2: 110-118.
This paper presents the possibility of using the numerical methods to analyze the work of hydraulic systems on the example of a cooling system of a power boiler auxiliary devices. The variety of conditions at which hydraulic system that operated in specific engineering subsystems requires an individualized approach to the model solutions that have been developed for these systems modernizing. A mathematical model of a series-parallel propagation for the cooling water was derived and iterative methods were used to solve the system of nonlinear equations. The results of numerical calculations made it possible to analyze different variants of a modernization of the studied system and to indicate its critical elements. An economic analysis of different options allows an investor to choose an optimal variant of a reconstruction of the installation.
S. AlSaqoor; A. Alahmer; F. Al Quran; A. Andruszkiewicz; K. Kubas; P. Regucki; W. Wędrychowicz. Numerical modeling for the retrofit of the hydraulic cooling subsystems in operating power plant. Thermal Engineering 2017, 64, 551 -558.
AMA StyleS. AlSaqoor, A. Alahmer, F. Al Quran, A. Andruszkiewicz, K. Kubas, P. Regucki, W. Wędrychowicz. Numerical modeling for the retrofit of the hydraulic cooling subsystems in operating power plant. Thermal Engineering. 2017; 64 (8):551-558.
Chicago/Turabian StyleS. AlSaqoor; A. Alahmer; F. Al Quran; A. Andruszkiewicz; K. Kubas; P. Regucki; W. Wędrychowicz. 2017. "Numerical modeling for the retrofit of the hydraulic cooling subsystems in operating power plant." Thermal Engineering 64, no. 8: 551-558.
The adsorption chiller technology makes possible to construct the chillers that can be powered by a low temperature heat source, which improves the efficiency of the energy and minimises the level of environmental pollutions. It has been found that adsorption chillers are valuable when the heat source is affordable as cogeneration, solar, geothermal, or waste heat sources, especially in situations when the heat is partially dissipated in the environment. On the other hand, adsorption chillers are non-competitive if the heat is delivered from dedicated combustion of fossil fuels, hence the relatively low COP of adsorption chillers against compressor chillers. For this reason, it was proposed and tested three-beds with dual evaporators of 100 kW adsorption chiller driven with low temperature heat from cogeneration. In order to achieve the highest performance, the switching time was optimized. It was found that the best adsorption performance is at switching time of about 900 sec to get the highest COP around 0.645 and total cooling capacity around 90.5 kW.
Sameh AlSaqoor; Ali Alahmer; Maciej Chorowski; Piotr Pyrka; Zbigniew Rogala. Performance evaluation for a low temperature heat powered for 3-beds with dual evaporators silica gel water adsorption chillers. 2017 8th International Renewable Energy Congress (IREC) 2017, 1 -6.
AMA StyleSameh AlSaqoor, Ali Alahmer, Maciej Chorowski, Piotr Pyrka, Zbigniew Rogala. Performance evaluation for a low temperature heat powered for 3-beds with dual evaporators silica gel water adsorption chillers. 2017 8th International Renewable Energy Congress (IREC). 2017; ():1-6.
Chicago/Turabian StyleSameh AlSaqoor; Ali Alahmer; Maciej Chorowski; Piotr Pyrka; Zbigniew Rogala. 2017. "Performance evaluation for a low temperature heat powered for 3-beds with dual evaporators silica gel water adsorption chillers." 2017 8th International Renewable Energy Congress (IREC) , no. : 1-6.
Nowadays, the world and the countries faced the main global problem related to production of huge quantities of wastes. Scientists are looking for methods, which can reduce the amount of wastes on landfills. The domestic waste and oil shale consist approximately of more than 45% and 22 % of organic fraction respectively. Used tires are very trouble some elements of municipal waste, but they are a good raw material for the pyrolysis process. This paper considers the possibilities of using new techniques based on a low temperature, quasi-pyrolysis technique combined with catalytic and adsorptive cleaning of post pyrolysis gasses with recovery of post-reaction heat. The advantages of the above mentioned new way over the conventional technology which based on the flame, does not produces additional by-products such as NO x , dioxins, furans, carbon dioxide, methane, etc. The maximum temperature of the process is not higher than 550 °C. In this manuscript appears the results of our experiments obtained from utilization waste, and oil shale using the above mentioned method.
Sameh AlSaqoor; Ali Alahmer; Nader Aljabarin; Mosa Gougazeh; D. Czajczynska; Renata Krzyżyńska. Effects of utilization of solid and semi-solid organic waste using pyrolysis techniques. 2017 8th International Renewable Energy Congress (IREC) 2017, 1 -5.
AMA StyleSameh AlSaqoor, Ali Alahmer, Nader Aljabarin, Mosa Gougazeh, D. Czajczynska, Renata Krzyżyńska. Effects of utilization of solid and semi-solid organic waste using pyrolysis techniques. 2017 8th International Renewable Energy Congress (IREC). 2017; ():1-5.
Chicago/Turabian StyleSameh AlSaqoor; Ali Alahmer; Nader Aljabarin; Mosa Gougazeh; D. Czajczynska; Renata Krzyżyńska. 2017. "Effects of utilization of solid and semi-solid organic waste using pyrolysis techniques." 2017 8th International Renewable Energy Congress (IREC) , no. : 1-5.
This study presents a comparative analysis of performance, exhaust and noise emissions for a one-cylinder, four-stroke, spark-ignition engine powered by gasoline fuels of two different grades of research octane numbers (RONs), namely octane 90, and octane 95. During the experimental works, each fuel test was performed by varying the engine speed within the range from 1000 to 3600 rpm. The SI engine was connected to eddy current dynamometer with electronic control unit (ECU), an exhaust gas analyzer and the sound level meter (SLM) to determine engine performance, exhaust emissions, and measuring the sound pressure level (SPL) in decibels (dBA) and one octave frequency bands in the audible human range at different engine speeds, respectively. The experimental results showed that the using gasoline with octane grades higher than the requirement of an engine will decrease the engine performance. On average, the brake power and thermal efficiency for the SI engine fuelled with octane 90 is higher than that of gasoline octane 95 by 6% and 11% respectively, and improvement of BSFC by 14%, which is mainly due to higher heating value. Even though, the volumetric efficiency of octane 95 is more 5% than octane 90 due to higher latent heat and heat capacity. In general, the exhaust emission profiles for NOx and CO of the engine improved for octane 95 by 11% and 17% respectively. On the other side, the HC and CO2 emissions concentration of gasoline octane 90 is lower than that of gasoline octane 95 by 18% and 12% respectively. Finally, the noise levels showed a trend of the increase of disturbing for higher octane number and the increase of divergence between the two values of SPL at higher speed for both fuels.
Ali Alahmer; Wail Aladayleh. Effect two grades of octane numbers on the performance, exhaust and acoustic emissions of spark ignition engine. Fuel 2016, 180, 80 -89.
AMA StyleAli Alahmer, Wail Aladayleh. Effect two grades of octane numbers on the performance, exhaust and acoustic emissions of spark ignition engine. Fuel. 2016; 180 ():80-89.
Chicago/Turabian StyleAli Alahmer; Wail Aladayleh. 2016. "Effect two grades of octane numbers on the performance, exhaust and acoustic emissions of spark ignition engine." Fuel 180, no. : 80-89.
Ali Alahmer; Xiaolin Wang; Raed Al-Rbaihat; K.C. Amanul Alam; Bidyut Saha. Performance evaluation of a solar adsorption chiller under different climatic conditions. Applied Energy 2016, 175, 293 -304.
AMA StyleAli Alahmer, Xiaolin Wang, Raed Al-Rbaihat, K.C. Amanul Alam, Bidyut Saha. Performance evaluation of a solar adsorption chiller under different climatic conditions. Applied Energy. 2016; 175 ():293-304.
Chicago/Turabian StyleAli Alahmer; Xiaolin Wang; Raed Al-Rbaihat; K.C. Amanul Alam; Bidyut Saha. 2016. "Performance evaluation of a solar adsorption chiller under different climatic conditions." Applied Energy 175, no. : 293-304.
Ali Alahmer. Thermal analysis of a direct evaporative cooling system enhancement with desiccant dehumidification for vehicular air conditioning. Applied Thermal Engineering 2016, 98, 1273 -1285.
AMA StyleAli Alahmer. Thermal analysis of a direct evaporative cooling system enhancement with desiccant dehumidification for vehicular air conditioning. Applied Thermal Engineering. 2016; 98 ():1273-1285.
Chicago/Turabian StyleAli Alahmer. 2016. "Thermal analysis of a direct evaporative cooling system enhancement with desiccant dehumidification for vehicular air conditioning." Applied Thermal Engineering 98, no. : 1273-1285.