Modeling and Simulation of a Two-Stage Air Cooled Adsorption Chiller with Heat Recovery Part I: Physical and Mathematical Performance Model

Makahleh, Firas M.; Badran, Ali A.; Attar, Hani; Amer, Ayman; Al-Maaitah, Ayman

doi:10.3390/app12136542

Cited by 8 publications

(4 citation statements)

References 33 publications

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“…In the MATLAB program, periodic boundary conditions for pressure are iteratively applied for each sector, while these conditions are inherently built into the VACCALC framework. Note that the simulation link was applied as in the references [24][25][26].…”

Section: Methodology Of Modeling and Simulationmentioning

confidence: 99%

Simulation of SESAME’s Synchrotron Storage Ring for the Pressure Predictions in Vacuum System

Makahleh,

Attar,

Manasrah

et al. 2023

Adv. Sci. Technol. Res. J.

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Many particle accelerators rely on maintaining low pressures to ensure efficient operation, minimize beam losses, and reduce radiation background. To ensure a beam lifetime of 1-20 hours for the Synchrotron-light for Experimental Science and Applications in the Middle East (SESAME) vacuum system, an ideal average dynamic pressure of 1×10 -9 mbar was targeted. This pressure was intended to be maintained while running the accelerator at a current of 400 mA after a cumulative dose of 100 Ah. In this study, a MATLAB code was employed to develop a series of one-dimensional equations that simulate the behavior of the vacuum system within the SESAME storage ring. The proposed model was then compared with the results generated by the VACCALC software and the Particle Monte Carlo (TPMC) MOLFLOW code, establishing a comprehensive assessment framework. The collected data from the model was subsequently compared with the recorded static and dynamic pressure measurements obtained during more than 1000 Ah of beam conditioning at 2.5 GeV. In results, the projected and actual values of dynamic pressures exhibited a satisfactory degree of agreement across the investigated range of beam conditioning doses, with a consistency factor exceeding 2 after a 100 Ah dose.

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Section: Methodology Of Modeling and Simulationmentioning

confidence: 99%

Simulation of SESAME’s Synchrotron Storage Ring for the Pressure Predictions in Vacuum System

Makahleh,

Attar,

Manasrah

et al. 2023

Adv. Sci. Technol. Res. J.

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“…The production of energy and industrial applications both produce enormous amounts of heat, as is well known [11][12][13]. The majority of this heat loss is high energy.…”

Section: Figure 1 Current and Expected Global Electricity Generationmentioning

confidence: 99%

Performance Evaluation of a Small Scale Ammonia-Water Absorption Cooling System for Off-Grid Rural Homes: A Numerical and Experimental Study

Younes,

Altork,

Shaban

2024

IJHT

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In areas with unreliable electricity, the absorption system serves as a crucial, eco-friendly refrigeration technology. This study addresses the system's performance gaps, evaluating the 100 W NH3-H2O absorption cooling system under various conditions. The focus is on its suitability for electricity-challenged areas, employing theoretical and experimental methods. Two configurations are tested based on input heat sources, using bifacial Photovoltaic (PV) or solar parabolic troughs integrated with the absorption chiller. The Engineering Equation Solver (EES) program determines thermodynamic properties, with the model split into sections-one with the solution heat exchanger (SHX) excluding the liquid-vapor heat exchanger (LVHX) and the other incorporating both. The findings indicate a direct correlation between higher evaporator and generator temperatures and an increase in the Coefficient of Performance (COP). The theoretical and experimental cooling COP values reach 0.62 and 0.63, respectively, at 7℃ evaporator temperature and 85℃ generator temperature. Similarly, at 95℃ generator temperature, the COP values are 0.629 and 0.637 for the same evaporator temperature. The theoretical maximum COP at 3℃ evaporator temperature is 0.512 at 90°C generator temperature, with experimental COP approaching 0.52 at generator temperatures of 96℃, 98℃, and 100℃. The integration of an LVHX into the chiller module demonstrates a notable improvement in cycle performance, enhancing efficiency by approximately 7-7.5%. In conclusion, this study offers crucial insights into optimizing the NH3-H2O absorption cooling system for off-grid scenarios, contributing to a broader understanding of absorption refrigeration technology in diverse environmental conditions.

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“…The third term represents the heat transfer by cooling water. The outlet temperature of the cooling water is calculated by Log Mean Temperature Difference (LMTD) (Figure 19): Schematic of two-stage adsorption chiller [34].…”

Section: Figure 16mentioning

confidence: 99%

Modeling and Simulation of Fluid Flow and Energy Systems

Makahleh,

Nassar

2023

Simulation Modeling - Recent Advances, New Perspectives, and Applications

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Engineering and science-related problems become more complicated as human knowledge evolves. This complication includes apparatus geometry and operational environment such as extreme variations in pressure and temperature. Analytical solution for such problems needs many assumptions that underestimate the problem under study and could lead to unrealistic results. Moreover, an experimental setup for a certain problem is constrained by the prototype size and each experiment is set up for certain operating conditions. This leads to building up many setups to deal with changes in size and operating conditions and, therefore, the prototype validation becomes very expensive and time-consuming. This calls for modeling and simulation approaches to deal with such engineering problems with the powerful computational capabilities available nowadays. Real-world patterns and processes are roughly modeled by scientific models. They may be refuted because they are representations, which are by definition imperfect. Models, however, are quite helpful for a variety of reasons. They first give us a method to comprehend procedures that would otherwise be incomprehensible to us. They also give scientists a base on which to build new research and theories. Finally, modeling and simulation reduce the time and cost of prototyping.

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Modeling and Simulation of a Two-Stage Air Cooled Adsorption Chiller with Heat Recovery Part I: Physical and Mathematical Performance Model

Cited by 8 publications

References 33 publications

Simulation of SESAME’s Synchrotron Storage Ring for the Pressure Predictions in Vacuum System

Simulation of SESAME’s Synchrotron Storage Ring for the Pressure Predictions in Vacuum System

Performance Evaluation of a Small Scale Ammonia-Water Absorption Cooling System for Off-Grid Rural Homes: A Numerical and Experimental Study

Modeling and Simulation of Fluid Flow and Energy Systems

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