scholarly journals An Innovative Design of an Integrated MED-TVC and Reverse Osmosis System for Seawater Desalination: Process Explanation and Performance Evaluation

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 607
Author(s):  
Omer Mohamed Abubaker Al-hotmani ◽  
Mudhar Abdul Alwahab Al-Obaidi ◽  
Yakubu Mandafiya John ◽  
Raj Patel ◽  
Iqbal Mohammed Mujtaba
Keyword(s):  
Reverse Osmosis ◽  
High Performance ◽  
Integrated System ◽  
Operating Conditions ◽  
The Novel ◽  
Innovative Design ◽  
High Performance Systems ◽  
Total Productivity ◽  
And Performance ◽  
Vapour Compression

In recent times two or more desalination processes have been combined to form integrated systems that have been widely used to resolve the limitations of individual processes as well as producing high performance systems. In this regard, a simple integrated system of the Multi Effect Distillation (MED)/Thermal Vapour Compression (TVC) and Permeate Reprocessing Reverse Osmosis (PRRO) process was developed by the same authors and confirmed its validity after a comparison study against other developed configurations. However, this design has a considerable amount of retentate flowrate and low productivity. To resolve this issue, two novel designs of MED and double reverse osmosis (RO) processes including Permeate and Retentate Reprocessing designs (PRRP and RRRO) are developed and modelled in this paper. To systematically assess the consistency of the presented designs, the performance indicators of the novel designs are compared against previous simple designs of MED and PRRO processes at a specified set of operating conditions. Results show the superiority of the integrated MED and double permeate reprocessing design. This has specifically achieved both economic and environmental advantages where total productivity is increased by around 9% and total retentate flowrate (disposed to water bodies) is reduced by 5% with a marginally reduced energy consumption.

scholarly journals Design and implementation of CNTFET based ternary 1x1 memories

2019 ◽  
Vol 8 (3) ◽  
pp. 175 ◽  
Author(s):  
S.Tamil Selvan ◽  
M. Sundararajan
Keyword(s):  
High Performance ◽  
Data Access ◽  
Cmos Technology ◽  
Access Time ◽  
The Novel ◽  
Design And Implementation ◽  
Technology Process ◽  
Sram Cell ◽  
And Performance ◽  
Power Application

In this paper presented Design and implementation of CNTFET based Ternary 1x1 RAM memories high-performance digital circuits. CNTFET Ternary 1x1 SRAM memories is implement using 32nm technology process. The CNTFET decresase the diameter and performance matrics like delay,power and power delay, The CNTFET Ternary 6T SRAM cell consists of two cross coupled Ternary inverters one is READ and another WRITE operations of the Ternary 6T SRAM cell are performed with the Tritline using HSPICE and Tanner tools in this tool is performed high accuracy. The novel based work can be used for Low Power Application and Access time is less of compared to the conventional CMOS Technology. The CNTFET Ternary 6T SRAM array module (1X1) in 32nm technology consumes only 0.412mW power and data access time is about 5.23ns.

The Ballistic Air Cleaner Concept for Army Vehicular Gas Turbines

1968 ◽  
Author(s):  
L. J. DuRocher ◽  
Hugo Giannotti
Keyword(s):  
Boundary Layer ◽  
Gas Turbines ◽  
High Performance ◽  
The Novel ◽  
Air Cleaner ◽  
And Performance

The air cleaner requirements for Army vehicular gas turbines are developed and performance of the novel boundary-layer ballistic type separator is discussed. A unit specifically designed for gas turbines demonstrates high performance. This separator is compared and field results are included.

Challenges Faced in Enhancing the Performance and Scalability in Parallel Computing Architecture

2016 ◽  
pp. 252-269
Author(s):  
M. Narayana Moorthi ◽  
R. Manjula
Keyword(s):  
Parallel Computing ◽  
High Performance ◽  
Cache Coherence ◽  
Computing Architecture ◽  
High Performance Systems ◽  
Practical Limit ◽  
Workload Distribution ◽  
And Performance ◽  
The Given ◽  
Processor Cores

Now a day the architecture of high performance systems are improving with more and more processor cores on the chip. This has both benefits as well as challenges. The benefit is running more task simultaneously which reduces the running time of the program or application. The challenges are what is the maximum limit of the number of cores in the given chip, how the existing and future software will make use of all the cores, what parallel programming language to choose, what are the memory and cache coherence issues involved when we increase the number of cores, how to solve the power and performance issues, how the cores are connected and how they are communicating to solve a single problem, workload distribution and load balancing issues in terms of scalability. There is a practical limit for speedup and scalability of number of cores on the chip which needs to be analyzed. So this chapter will focus on the introduction and overviews of parallel computing and the challenges faced in enhancing the performance and scalability in parallel computing architecture.

CFD Modeling and Performance Analysis of a Thermoacoustically Driven Thermoacoustic Refrigerator

2021 ◽  
pp. 2150029
Author(s):  
Zahra Bouramdane ◽  
Abdellah Bah ◽  
Mohammed Alaoui ◽  
Nadia Martaj
Keyword(s):  
High Performance ◽  
Operating Conditions ◽  
Cfd Modeling ◽  
Geometrical Parameters ◽  
Pressure Amplitude ◽  
Cfd Analysis ◽  
Thermoacoustic Engine ◽  
Simulation Results ◽  
And Performance ◽  
Thermoacoustic Refrigerator

Although thermoacoustic devices comprise simple components, the design of these machines is very challenging. In order to predict the behavior and optimize the performance of a thermoacoustic refrigerator driven by a standing-wave thermoacoustic engine, considering the changes in geometrical parameters, two analogies have been presented in this paper. The first analogy is based on CFD analysis where a 2D model is implemented to investigate the influence of stack parameters on the refrigerator performance, to analyze the time variation of the temperature gradient across the stack, and to examine the refrigerator performance in terms of refrigeration temperature. The second analogy is based on the use of an optimization algorithm based on the simplified linear thermoacoustic theory applied for designing thermoacoustic refrigerators with different stack parameters and operating conditions. Simulation results show that the engine produced a high-powered acoustic wave with a pressure amplitude of 23[Formula: see text]kPa and a frequency of 584[Formula: see text]Hz and this wave applies a temperature difference across the refrigeration stack with a cooling temperature of 292.8[Formula: see text]K when the stacks are positioned next to the pressure antinode. The results from the algorithm give the ability to design any thermoacoustic refrigerator with high performance by picking the appropriate parameters.

Development of “SAWBLAST®” Fuel Nozzle Concept for Improved Fuel Atomization and Mixing in High Performance Gas Turbine Combustors: Part I—Conceptual Design

2012 ◽  
Author(s):  
Mohammed A. Mawid ◽  
F. Philip Lee
Keyword(s):  
High Performance ◽  
Operating Conditions ◽  
The Novel ◽  
Nozzle Design ◽  
Fuel Injector ◽  
Cold Flow ◽  
Fuel Atomization ◽  
Fuel Nozzle ◽  
Combustion Tests ◽  
Spray Characterization

A novel piloted-single lip airblast fuel nozzle design concept termed “SAWBLAST®” was conceived, designed, fabricated, and tested. It has three airflow passages and two fuel circuits for pilot and main. The fuel nozzle was tested under cold flow conditions for spray characterization such as spray patternation, ACd, and SMD. A large test matrix that included over 22 design configurations, in addition to a baseline fuel nozzle was used. Based upon the cold flow spray characterization tests, two different fuel injector design configurations were down selected for combustion tests. The down selected configurations incorporated specific design features and geometries to reflect the novel fuel nozzle concept. The spray characterization tests for “SAWBLAST®” design configuration labeled as number 4 (in text) yielded a much improved spray patternation than a baseline piloted airblast fuel nozzle with a similar total ACd and under the same operating conditions. This improvement amounted to about 40% reduction in the spray patternation compared to the baseline fuel nozzle design. This level of improvement was deemed as substantial over the currently employed piloted airblast fuel nozzles. The same “SAWBLAST®” design configuration number 4 also showed better SMD performance than the baseline near the spray edges.

Performance characteristics of natural-refrigerants- based ejector expansion refrigeration cycles

2009 ◽  
Vol 223 (5) ◽  
pp. 543-550 ◽  
Author(s):  
J Sarkar
Keyword(s):  
Heat Exchanger ◽  
Internal Heat ◽  
Area Ratio ◽  
Operating Conditions ◽  
Coefficient Of Performance ◽  
Internal Heat Exchanger ◽  
Optimum Parameters ◽  
And Performance ◽  
Vapour Compression ◽  
Cycle Temperature

The thermodynamic analyses and comparison of three natural-refrigerants-based vapour compression refrigeration cycles (ammonia, isobutane, and propane) are presented in this article using a constant pressure mixing ejector as an expansion device. Optimization of the area ratio of the ejector is done based on maximum cooling coefficient of performance (COP) and performance improvement for different operating conditions. The effect of using an internal heat exchanger is studied as well. Results show that optimum area ratio and cooling COP increases with a decrease in cycle temperature lift, whereas the COP improvement over basic expansion cycle increases with the increase in cycle temperature lift. Study shows that the optimum parameters, as well as performance using the ejector as an expansion device, are strongly dependent on the refrigerant properties as well as the operating conditions. The optimum area ratio is maximum for ammonia and minimum for propane, whereas maximum cooling COPs are similar. Using the ejector as an expansion device, propane yields a maximum COP improvement of 26.1 per cent followed by isobutane (22.8 per cent) and ammonia (11.7 per cent) for studies ranges. The effect of using an internal heat exchanger in the ejector expansion refrigeration cycle is found to be not profitable.

A Fuel Cell Stack Architecture to Make all Cells Have Equal Operational Conditions and Performance

2012 ◽  
Author(s):  
Hong Liu ◽  
Peiwen Li ◽  
Alexandra Hartz
Keyword(s):  
Fuel Cell ◽  
High Performance ◽  
Proton Exchange Membrane ◽  
Experimental Tests ◽  
Proton Exchange ◽  
The Novel ◽  
Fuel Cell Stack ◽  
Operational Conditions ◽  
And Performance ◽  
Exchange Membrane

This paper presents a novel architecture for a proton-exchange membrane (PEM) fuel cell stack, which is based on the concept that every cell in the stack works at the same condition and thus each cell has the same contribution to the overall output voltage and power. To meet this proposed requirement, special flow distributors were used to evenly distribute fuel and airflow to every fuel cell in the stack. Details of the flow distributor and experimental tests of a four-cell fuel cell stack are presented in the paper. The experimental results demonstrated the desired high performance of the fuel cell stack. It is proved that the novel architecture for fuel cell stack is successful and of significance to the development of high performance fuel cell stacks.

Enhancing the Scalability of Multi-FPGA Stencil Computations via Highly Optimized HDL Components

2021 ◽  
Vol 14 (3) ◽  
pp. 1-33
Author(s):  
Enrico Reggiani ◽  
Emanuele DEL Sozzo ◽  
Davide Conficconi ◽  
Giuseppe Natale ◽  
Carlo Moroni ◽  
...  
Keyword(s):  
Power Efficiency ◽  
High Performance ◽  
Performance Enhancement ◽  
State Of The Art ◽  
Design Flow ◽  
Art Works ◽  
Multiple Devices ◽  
High Performance Systems ◽  
Computationally Intensive ◽  
And Performance

Stencil-based algorithms are a relevant class of computational kernels in high-performance systems, as they appear in a plethora of fields, from image processing to seismic simulations, from numerical methods to physical modeling. Among the various incarnations of stencil-based computations, Iterative Stencil Loops (ISLs) and Convolutional Neural Networks (CNNs) represent two well-known examples of kernels belonging to the stencil class. Indeed, ISLs apply the same stencil several times until convergence, while CNN layers leverage stencils to extract features from an image. The computationally intensive essence of ISLs, CNNs, and in general stencil-based workloads, requires solutions able to produce efficient implementations in terms of throughput and power efficiency. In this context, FPGAs are ideal candidates for such workloads, as they allow design architectures tailored to the stencil regular computational pattern. Moreover, the ever-growing need for performance enhancement leads FPGA-based architectures to scale to multiple devices to benefit from a distributed acceleration. For this reason, we propose a library of HDL components to effectively compute ISLs and CNNs inference on FPGA, along with a scalable multi-FPGA architecture, based on custom PCB interconnects. Our solution eases the design flow and guarantees both scalability and performance competitive with state-of-the-art works.

The high-performance HRM systems in shaping employee performance – an analysis into the mediating effect of the psychological contract based on organisations in Central Poland

2020 ◽  
Vol 25 (3) ◽  
pp. 581-601
Author(s):  
Anna Rogozińska-Pawełczyk
Keyword(s):  
Literature Review ◽  
Psychological Contract ◽  
High Performance ◽  
Employee Performance ◽  
Mediating Effect ◽  
Central Poland ◽  
High Performance Systems ◽  
And Performance ◽  
Intermediate Variables

This paper uses independent and intermediate variables (individual and organisational) to study employee performance. It was prepared based on a literature review and a study of relations between the high-performance systems (the main predictor) and employee performance (composed of their behaviours and performance) mediated by the fulfilment of psychological contract. The research showed that the high-performance HRM systems (consisting of content, process and climate) directly and indirectly influence employee performance through the mediating effect of the psychological contract setting out the obligations of employers and employees towards each other.

Analysis and Assessment of Tower Solar Collector Driven Trigeneration System

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Abdul Khaliq ◽  
Mathkar A. Alharthi ◽  
Saeed Alqaed ◽  
Esmail M. A. Mokheimer ◽  
Rajesh Kumar
Keyword(s):  
Energy Efficiency ◽  
Solar Collector ◽  
Lithium Bromide ◽  
Rankine Cycle ◽  
Significant Rise ◽  
Exergy Efficiency ◽  
Integrated System ◽  
Operating Conditions ◽  
Heating And Cooling ◽  
And Performance

Abstract This paper describes the development and performance assessment of a tower solar collector driven integrated system operating in trigeneration mode to generate electricity, heating, and cooling, in a carbon-free manner. The proposed system applies a heliostat-based central receiver unit as a base of solar energy input to drive the steam Rankine cycle which is combined with the process heater and the lithium bromide-water operated absorption chiller. An analysis is performed to monitor the behavior of energy and exergy efficiency at various operating conditions of the proposed trigeneration system. The computed results are authenticated with the reported literature. A comparison is made between the present findings and reported results in the form of exergy efficiency, total exergy destroyed, and energy efficiency. Consideration of process heat and cold along with electricity provides a promising increase in energy efficiency from 15.8% to 64.1% while the exergy efficiency is enhanced from 16.9% to 24.4%. Variation in direct normal irradiations from 600 W/m2 to 1000 W/m2 results in the significant rise of energetic and exergetic outcomes of the proposed trigeneration system. Out of 100% solar exergy supplied to the proposed trigeneration, 24% is generated as the exergetic output, 1.6% is lost to ambient, and the remaining 74.4% is the exergy destroyed in the system components.

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