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Articles 1 - 7 of 7
Full-Text Articles in Engineering
Energy Efficiency And Economic Feasibility Of An Absorption Air-Conditioning System Using Wet, Dry And Hybrid Heat Rejection Methods, Julia Aman, Paul Henshaw, David S-K Ting
Energy Efficiency And Economic Feasibility Of An Absorption Air-Conditioning System Using Wet, Dry And Hybrid Heat Rejection Methods, Julia Aman, Paul Henshaw, David S-K Ting
Mechanical, Automotive & Materials Engineering Publications
In tropical and sub-tropical regions, air-conditioning systems account for the greatest electricity consumption and high water use. Solar-driven absorption cooling systems can conveniently reduce electricity consumption at need. The performance of this cooling system depends on the system’s heat rejection. A simulation was performed for a 15 kW single effect ammonia-water absorption cooling system driven by low temperature thermal energy and with three different heat rejection methods (wet cooling, dry cooling, and hybrid cooling). This hybrid cooling system uses wet cooling on the absorber and dry cooling on the condenser. The system performance and economics of the chiller with these …
Bubble-Pump-Driven Libr-H2o And Licl-H2o Absorption Air-Conditioning Systems, Julia Aman, Paul Henshaw, David S-K Ting
Bubble-Pump-Driven Libr-H2o And Licl-H2o Absorption Air-Conditioning Systems, Julia Aman, Paul Henshaw, David S-K Ting
Mechanical, Automotive & Materials Engineering Publications
A thermally-driven bubble pump, powered by solar or waste heat energy, is a simple and efficient technique for lifting a liquid from lower to higher levels, after which it can flow by gravity. In this study, solar thermal driven pumps were incorporated in the solar collector as well as in the refrigerant cycle to provide a design of an air-conditioning system for a residential home that is independent of grid electricity. The crystallization challenge, low pressure, and low efficiency are the main downsides of bubble-pump-driven LiBr-H2O refrigeration systems, in comparison with other bubble-pump-driven diffusion absorption refrigeration systems. Therefore, a complete …
Performance Evaluation Of Reverse Logistics Enterprise – An Agent-Based Simulation Approach, Gowtham Ravi Sankara Pandian, Walid Abdul-Kader
Performance Evaluation Of Reverse Logistics Enterprise – An Agent-Based Simulation Approach, Gowtham Ravi Sankara Pandian, Walid Abdul-Kader
Industrial and Manufacturing Systems Engineering Publications
Reverse logistics (RL) has been applied in many industries and sectors since its conception. Unlike forward logistics, retracing consumer goods from the point of consumption to the point of inception is not a well-studied process. It involves many uncertainties such as time, quality and quantity of returns. The returned products can be remanufactured, have parts harvested, or be disposed safely. It is important to implement these activities in a cost-effective manner. The aim of this research is to measure the performance of the RL enterprise with the help of an agent-based simulation model. The major entities in the RL network …
Digit-Level Serial-In Parallel-Out Multiplier Using Redundant Representation For A Class Of Finite Fields, Parham Hosseinzadeh Namin, Roberto Muscedere, Majid Ahmadi
Digit-Level Serial-In Parallel-Out Multiplier Using Redundant Representation For A Class Of Finite Fields, Parham Hosseinzadeh Namin, Roberto Muscedere, Majid Ahmadi
Electrical and Computer Engineering Publications
Two digit-level finite field multipliers in F2m using redundant representation are presented. Embedding F2m in cyclotomic field F2(n) causes a certain amount of redundancy and consequently performing field multiplication using redundant representation would require more hardware resources. Based on a specific feature of redundant representation in a class of finite fields, two new multiplication algorithms along with their pertaining architectures are proposed to alleviate this problem. Considering area-delay product as a measure of evaluation, it has been shown that both the proposed architectures considerably outperform existing digit-level multipliers using the same basis. It is …
Simultaneous Measurement Of Refractive Index And Thickness Of Multilayer Systems Using Fourier Domain Optical Coherence Tomography, Part 2: Implementation, Payman Rajai
Mechanical, Automotive & Materials Engineering Publications
We introduce a theoretical method for simultaneous measurement of refractive index and thickness of multilayer systems using Fourier domain optical coherence tomography (FD-OCT) without any auxiliary arrangement. The input data to the formalism are the FD-OCT measured optical path lengths (OPLs) and properly selected spectral components of FD-OCT interference spectrum. The outputs of the formalism can be affected significantly by uncertainty in measuring the OPLs. An optimization method is introduced to deal with the relatively large amount of uncertainty in measured OPLs and enhance the final results. Simulation result shows that by using the optimization method, indices can be extracted …
Simultaneous Measurement Of Refractive Index And Thickness Of Multilayer Systems Using Fourier Domain Optical Coherence Tomography, Part 1: Theory, Payman Rajai
Mechanical, Automotive & Materials Engineering Publications
We introduce a theoretical framework for simultaneous refractive index and thickness measurement of multilayer systems using the Fourier domain optical coherence tomography (FD-OCT) system without any previous information about the item under investigation. The input data to the new formalism are the FD-OCT measured optical path lengths and properly selected spectral components of the FD-OCT interference spectrum. No additional arrangement, reference reflector, or mechanical scanning is needed in this approach. Simulation results show that the accuracy of the extracted parameters depends on the index contrast of the sample while it is insensitive to the sample’s thickness profile. For transparent biological …
Three-Dimensional Container Loading: A Simulated Annealing Approach, Hanan Mostaghimi Ghomi, Bryan Gary St. Amour, Walid Abdul-Kader
Three-Dimensional Container Loading: A Simulated Annealing Approach, Hanan Mostaghimi Ghomi, Bryan Gary St. Amour, Walid Abdul-Kader
Industrial and Manufacturing Systems Engineering Publications
High utilization of cargo volume is an essential factor in the success of modern enterprises in the market. Although mathematical models have been presented for container loading problems in the literature, there is still a lack of studies that consider practical constraints. In this paper, a Mixed Integer Linear Programming is developed for the problem of packing a subset of rectangular boxes inside a container such that the total value of the packed boxes is maximized while some realistic constraints, such as vertical stability, are considered. The packing is orthogonal, and the boxes can be freely rotated into any of …