scholarly journals Designing Rainwater Harvesting Systems Cost-Effectively in a Urban Water-Energy Saving Scheme by Using a GIS-Simulation Based Design System

Water ◽  
2015 ◽  
Vol 7 (11) ◽  
pp. 6285-6300 ◽  
Author(s):  
Yie-Ru Chiu ◽  
Yao-Lung Tsai ◽  
Yun-Chih Chiang
Keyword(s):  
Energy Saving ◽  
Rainwater Harvesting ◽  
Design System ◽  
Urban Water ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Harvesting Systems

scholarly journals Incorporating Rainwater Harvesting Systems in Iran’s Potable Water-Saving Scheme by Using a GIS-Simulation Based Decision Support System

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 752 ◽  
Author(s):  
Yie-Ru Chiu ◽  
Kamaleddin Aghaloo ◽  
Babak Mohammadi
Keyword(s):  
Decision Support ◽  
Water Stress ◽  
Support System ◽  
Large Scale ◽  
Rainwater Harvesting ◽  
Water Saving ◽  
Urban Water ◽  
Simulation Based ◽  
Harvesting Systems ◽  
Guilan Province

Rainwater harvesting systems (RWHSs) have been accepted as a simple and effective approach to ease the worsening of urban water stress. However, in arid and semiarid regions, a comprehensive method for promoting domestic RWHSs in a large-scale water-saving scheme that incorporates water consumption reducing equipment (WCRE) and gray water reuse (GWR), has not been well developed. For this, based on the case study of Guilan Province, Iran, this study addressed the temporal-spatial complex of rainfall and proposed a GIS-simulation-based decision support system (DSS). Herein, two scenarios, i.e., the typical RWHS and the modified RWHS for arid areas, were tested; and the associated economic analysis was performed and compared with WCRE and GWR. Moreover, for larger-scale implementation, the multiple criteria decision making (MCDM) technique was further applied to address the social-environmental complexity of these water-saving methods. Guilan Province has thereby been classified into three priority levels, providing a straightforward understanding of how to promote the large-scale water-saving scheme. Compared with the traditional generalized method, sensitivity analysis verified that this DSS enhanced the information value. Hence, the DSS that provides more holistic and comprehensive support has been identified as a useful tool to ease the threat of urban water stress.

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

2020 ◽  
pp. 095965182097389
Author(s):  
Samir Kumar Hati ◽  
Nimai Pada Mandal ◽  
Dipankar Sanyal
Keyword(s):  
Energy Saving ◽  
Absolute Error ◽  
Fast Response ◽  
Maximum Energy ◽  
Radial Clearance ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Axial Piston

Losses in control valves drag down the average overall efficiency of electrohydraulic systems to only about 22% from nearly 75% for standard pump-motor sets. For achieving higher energy efficiency in slower systems, direct pump control replacing fast-response valve control is being put in place through variable-speed motors. Despite the promise of a quicker response, displacement control of pumps has seen slower progress for exhibiting undesired oscillation with respect to the demand in some situations. Hence, a mechatronic simulation-based design is taken up here for a variable-displacement pump–controlled system directly feeding a double-acting single-rod cylinder. The most significant innovation centers on designing an axial-piston pump with an electrohydraulic compensator for bi-directional swashing. An accumulator is conceived to handle the flow difference in the two sides across the load piston. A solenoid-driven sequence valve with P control is proposed for charging the accumulator along with setting its initial gas pressure by a feedforward design. Simple proportional–integral–derivative control of the compensator valve is considered in this exploratory study. Appropriate setting of the gains and critical sizing of the compensator has been obtained through a detailed parametric study aiming low integral absolute error. A notable finding of the simulation is the achievement of the concurrent minimum integral absolute error of 3.8 mm s and the maximum energy saving of 516 kJ with respect to a fixed-displacement pump. This is predicted for the combination of the circumferential port width of 2 mm for the compensator valve and the radial clearance of 40 µm between each compensator cylinder and the paired piston.

Based on the CAD / CAE Technology Product Simulation Design System

2012 ◽  
Vol 479-481 ◽  
pp. 186-189
Author(s):  
Yu Zhao
Keyword(s):  
Product Design ◽  
Design System ◽  
Simulation Design ◽  
Analysis And Design ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Technology Product ◽  
Design Requirements ◽  
Cae Technology ◽  
Performance Analysis And Design

The paper analyze the existing CAD / CAE methods and differences in product design requirements. It points out that firstly, performance analysis and design is the core of mechanical product design; Secondly, integrated CAD / CAE technology, product design should be based on CAE-centric the design process. It proposes simulation-based design methods and constructs a performance-oriented product design system.

scholarly journals Towards Circular Water Neighborhoods: Simulation-Based Decision Support for Integrated Decentralized Urban Water Systems

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1227 ◽  
Author(s):  
Dimitrios Bouziotas ◽  
Diederik van Duuren ◽  
Henk-Jan van Alphen ◽  
Jos Frijns ◽  
Dionysios Nikolopoulos ◽  
...  
Keyword(s):  
Rainwater Harvesting ◽  
Water Cycle ◽  
Urban Water ◽  
Management Support ◽  
Beneficial Effects ◽  
Simulation Based ◽  
Distributed Solutions ◽  
Multiple Challenges ◽  
Neighborhood Scale ◽  
Urban Water Cycle

Centralized urban water management currently faces multiple challenges, both at the supply side and the demand side. These challenges underpin the need to progress to the decentralization of urban water, where multiple distributed technologies (water-aware appliances, rainwater harvesting, greywater recycling, sustainable urban drainage) are applied in an integrated fashion and as a supplement to centralized systems to design more resilient neighborhoods. However, the methods and tools to assess the performance of these distributed solutions and provide management support for integrated projects are still few and mostly untested in real, combined cases. This study presents a simulation-based framework for the quantitative performance assessment of decentralized systems at a neighborhood scale, where different technologies can be linked together to provide beneficial effects across multiple urban water cycle domains. This framework links an urban water cycle model, which provides a scenario-based simulation testbed for the response of the whole system, with key performance indicators that evaluate the performance of integrated decentralized solutions at a neighborhood scale. The demonstrated framework is applied to provide an ex ante evaluation of SUPERLOCAL, a newly developed area in Limburg, the Netherlands, designed as a circular, water-wise neighborhood where multiple decentralized technologies are combined.

Assessment of the role of green infrastructure in sustainable urban water management

2020 ◽  
Author(s):  
Ágnes Gulyás ◽  
Ákos Csete
Keyword(s):  
Green Infrastructure ◽  
Surface Runoff ◽  
Urban Areas ◽  
Rainwater Harvesting ◽  
Water Cycle ◽  
Urban Water ◽  
Urban Water Management ◽  
Sustainable Urban Water Management ◽  
Harvesting Systems

<p>Due to the climate change caused uncertainty, the urban areas face new challenges. In addition to mitigating the negative effects, it is important the developments need to implemented in a sustainable manner. The problem of urban areas is substantial on account of their growing spatial size and population, furthermore the inadequate infrastructure. Urban districts with inadequate infrastructure can be a major source of water pollution, but also have a significant impact on the well-being of the citizens. In modern urban planning the sustainable urban water management based on the usage of green infrastructure. Green infrastructure is an important tool to make urban water cycle sustainable by linking artificial, engineered elements (gray infrastructure) with the services provided by vegetation. Green infrastructure can help to make the urban water cycle sustainable in many ways. Its primary role is the mitigating effect, such as reducing and retaining surface runoff with the process of interception and evaporation. Due to the complex structure of vegetation, it can also play an important role in infiltration (by root system), thus also reducing surface runoff.</p><p>Providing adequate data on the role of green infrastructure <strong>–</strong> even on a city-wide scale <strong>–</strong> can help decision makers. To accomplish this, hydrological models can play an important role. If these models (i-Tree Hydro) based on appropriate meteorological and land cover data, they can help to estimate the runoff and infiltration of study areas and the reducing effect of vegetation (interception, evaporation). In our study, we attempted to compare two significantly different urban district based on these aspects and to analyze the differences. Analyzes in the two study areas of Szeged (Hungary) all suggest the vegetation can significantly contribute to the reduction of surface runoff. Differences between these urban districts can be quantified so these data can serve as a basis for decision making in urban planning processes.</p><p>As another element of our research, we analyzed the relationship between surface runoff and infiltration in modeling study (SWMM) of rainwater harvesting systems in public institutions (kindergartens). In this part of the research, besides the efficiency of the rainwater harvesting systems, we got data about the extent of surface runoff, evaporation and infiltration on yard of kindergartens.</p>

Impact of Simulation-Based Design on Today's Shipbuilders

1997 ◽  
Vol 34 (01) ◽  
pp. 1-9
Author(s):  
Michael A. Polini ◽  
Daniel J. Wooley ◽  
James D. Butler
Keyword(s):  
Structural Analysis ◽  
Ship Design ◽  
Design System ◽  
Concurrent Design ◽  
Research Projects ◽  
Newport News ◽  
Single Plate ◽  
Simulation Based Design ◽  
Simulation Based ◽  
The Impact

The Advanced Research Projects Agency (ARPA) sponsored the development of a prototype of the n rt-generation ship design system. The results of the project, titled Simulation-Based Design (SBD), were demonstrated in June of 1994. Based on its success and on the benefits it offers over today's systems, ARPA has initiated a new program to full)' develop SBD. The goal is to create a virtual environment in which a ship can be totally designed, manufactured, operated, and evaluated before a single plate is cut, part is ordered, or piece of equipment is purchased. The ramifications of such a tool are widespread across both the commercial and naval shipbuilding markets, and SBD will, undoubtedly, lead to changes in the way we do business. Newport News Shipbuilding (NNS) was a partner on one of the teams responsible for developing one of the two prototypes considered by ARPA. As such, they have had an opportunity to weigh the impact of such a system in today's marketplace. This paper discusses some of the capabilities that SBD will provide to shipbuilders of the future, especially in the areas of concurrent design, coupled analyses (e.g., seakeeping and structural analysis), digital mockups, and manufacturing simulation.

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