scholarly journals Modeling, Simulation, and Optimization of a Solar-Based System of Desalination Using Humidification and Dehumidification

2020 ◽  
Vol 10 (10) ◽  
pp. 3361
Author(s):  
Khalifa Zhani ◽  
Khaled Ali Abuhasel
Keyword(s):  
Vapor Compression ◽  
Climate Conditions ◽  
Simulation And Optimization ◽  
Modeling Simulation ◽  
Solar Desalination ◽  
Multi Stage ◽  
Effective System ◽  
Flash Distillation ◽  
Simulation Results ◽  
Multiple Effect Distillation

Solar desalination systems are characterized by low freshwater production compared with the usual techniques of mineral and salt removal from water. The usual methods include, but are not limited to, multi-stage flash distillation, multiple-effect distillation, vapor-compression desalination, and reverse osmosis. Solar desalination requires various modifications to make it more productive than the usual methods. The method is suitable for energy and environmental protection, making it the most effective system. The adjustments involve using the humidification and dehumidification principle (HD). The three configurations of the HD solar desalination system in this project are designed to accommodate variations in climate conditions and seasonal changes. Mathematical models are designed to test the workability of the system in an ideal environment. The models are based on universal fluid equations that regulate the functioning of each component of the system. After the model is designed, a regulation algorithm is designed based on the model. The simulation results show that the gain in freshwater production using a regulation algorithm is in the order of 33%.

Integrated Wastewater Recovery and Reuse via Waste Heat Utilization

2013 ◽  
Author(s):  
Yaroslav Chudnovsky ◽  
Aleksandr Kozlov
Keyword(s):  
Energy Efficiency ◽  
Reverse Osmosis ◽  
Waste Heat ◽  
Wastewater Reuse ◽  
Electricity Consumption ◽  
Recovery Process ◽  
Vapor Compression ◽  
Membrane Processes ◽  
Multi Stage ◽  
Flash Distillation

A variety of industrial wastewater recovery technologies for different areas and applications has been developed over the years, including primarily thermal and membrane processes. The main thermal processes include atmospheric distillation, distillation with mechanical vapor compression, vacuum distillation, multi-stage flash distillation, multi-effect distillation with thermal vapor compression, etc. [1,2]. The membrane processes contain reverse osmosis, electrodialysis, and nanofiltration. The multi-stage flash distillation and reverse osmosis processes dominate in most applications. Wastewater recovery and re-use technologies have been expanding rapidly in recent decades. The market is also driven by the falling costs of wastewater recovery, which are due to the technological advances in the process. The costs of clean water produced by wastewater recovery process dropped considerably over the years as a result of reductions in price of equipment, reductions in power consumption and advances in system design and operating experiences. In this work state-of-the art and innovative wastewater recovery/re-use technologies are estimated and compared in their features and cost respects. The new technology is discussed that allows increasing in energy efficiency of the wastewater recycling and reduce electricity consumption associated with conventional methods. Successful development and implementation of the technology for food processing applications will provide large energy and water savings to the industry. These savings are tied to an energy efficiency increase and reduction in pumping power for process water supply. The ability to integrate waste heat recovery with wastewater reuse also leads to product cost reduction opportunities for producers.

Treatment of Oilfield Sewage by Thermal Distillation Technology

2014 ◽  
Vol 955-959 ◽  
pp. 2911-2914
Author(s):  
Jia Bin Zhu ◽  
Shu Zhong Wang ◽  
Jian Ping Yang
Keyword(s):  
Waste Heat ◽  
Water Shortage ◽  
Extraction Process ◽  
Low Grade ◽  
Water Recovery ◽  
Vapor Compression ◽  
Steam Assisted Gravity Drainage ◽  
Multi Stage ◽  
Liaohe Oilfield ◽  
Flash Distillation

A large amount of waste heat is generated in the oil extraction process when using steam assisted gravity drainage (SAGD) technology. Thermal distillation technology is recommended to deal with the Liaohe Oilfield sewage. It not only can utilize the low-grade energy source, but also can recover the water to settle the water shortage problem. The principles and processes of multi-stage flash distillation (MSF), multi-effect distillation (MED) and vapor compression (VC) are introduced, and the tech-economic analysis is also made. It is found that it has significant advantage in heat and water recovery using the MED technology to deal with the Liaohe Oilfield sewage.

scholarly journals Modeling and Simulation of a Desiccant Evaporative Cooling System

2019 ◽  
Vol 26 (3) ◽  
pp. 10-18
Author(s):  
Omar M. Hamdoon ◽  
Burhan M. Al-Ali
Keyword(s):  
Cooling System ◽  
Vapor Compression ◽  
Air Conditioning System ◽  
Climate Conditions ◽  
Compression System ◽  
Evaporative Cooling System ◽  
Vapor Compression System ◽  
Three Stages ◽  
Simulation Results ◽  
System Operating

This paper studies the performance of a proposed desiccant assisted air conditioning system operating under the hot and dry climate conditions of Mosul city, Iraq. The proposed system consists of three stages: indirect/direct evaporative cooler, an enthalpy wheel, and a traditional vapor compression system. The performance of the suggested system is compared with that of the vapor compression system operating at the same conditions. The simulation results showed that an optimum rotational speed of 12.5 rpm is required for the enthalpy wheel to achieve the best system performance. The simulation results also showed the ability of the proposed system to achieve a power consumption saving of 51.03%, in the ventilation mode, and 22.93%, in the mixing mode with a ventilation mixing ratio of 0.4 when compared to the vapor compression system.

scholarly journals Experimental Validation of a Solar Powered Multistage Flash Desalination Unit with Alternate Storage Tanks

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2143
Author(s):  
Mishal Alsehli
Keyword(s):  
Water Resources ◽  
Solar Collector ◽  
Fossil Fuels ◽  
Feed Water ◽  
Daily Production ◽  
Solar Desalination ◽  
High Solar Radiation ◽  
Multi Stage ◽  
Tank Design ◽  
Solar Powered

The fossil fuels that power conventional desalination systems cause substantial environmental impact. Solar desalination can satisfy critical water needs with only a minimal contribution to global warming. The current work presents an attractive new design suitable for regions with limited water resources and high solar radiation rates. This work is an experimental study of a newly designed, solar-powered, multi-stage flash (MSF) desalination plant. The design could address the need to increase the limited water resources in solar energy-rich areas. The prototype consists of a solar collector, an MSF unit, and a novel dual thermal storage tank design. In this prototype, preheated brine is directly heated by circulation through the solar collector. Two tanks serve the MSF unit; one tank feeds the MSF unit while the other receives the preheated feed water. The two tanks alternate roles every 24 h. The study was conducted in Taif, Saudi Arabia, throughout the month of September 2020. The results of the experiment showed that 1.92 square meters of solar collector area is needed for an average daily production of 19.7 kg of fresh water, at a cost of approximately $0.015 per liter.

A Unitary-UCA-Root-MUSIC Algorithm Based on MSWF

2014 ◽  
Vol 610 ◽  
pp. 339-344
Author(s):  
Qiang Guo ◽  
Yun Fei An
Keyword(s):  
Computer Simulation ◽  
Computational Complexity ◽  
Real Time ◽  
Unitary Transformation ◽  
Wiener Filter ◽  
Doa Estimation ◽  
Signal Subspace ◽  
Music Algorithm ◽  
Multi Stage ◽  
Simulation Results

A UCA-Root-MUSIC algorithm for direction-of-arrival (DOA) estimation is proposed in this paper which is based on UCA-RB-MUSIC [1]. The method utilizes not only a unitary transformation matrix different from UCA-RB-MUSIC but also the multi-stage Wiener filter (MSWF) to estimate the signal subspace and the number of sources, so that the new method has lower computational complexity and is more conducive to the real-time implementation. The computer simulation results demonstrate the improvement with the proposed method.

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