The Experts below are selected from a list of 192 Experts worldwide ranked by ideXlab platform
Nick Barnard - One of the best experts on this subject based on the ideXlab platform.
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Building Services Standard Solutions
Computer Aided Architectural Design Futures 2001, 2020Co-Authors: Benachir Medjdoub, Paul Richens, Nick BarnardAbstract:Object-based CAD programming is used to take advantage of standardisation to handle the schematic design, sizing, layout and (potentially) pipe-routing for LPHW (Low Pressure Hot Water) Plant Rooms in buildings. From a simple specification of the Plant Room geometry, and the heating load in kw, our software proceeds through a number of steps. First the standard number and size of modular boilers, pumps etc. is determined from the heat load. Then a compatible optimising 3D variational solution is generated, using Constraint Logic Programming. Our approach is highly interactive. Modifying the topology of the solution is done directly through the graphic interface, e.g. modifying a boiler position is done by dragging; the system automatically updates the 3D model including the pipe-routing while maintaining all the constraints, and hence the validity of the design.
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generation of variational standard Plant Room solutions
Automation in Construction, 2003Co-Authors: Benachir Medjdoub, Paul Richens, Nick BarnardAbstract:We have used the object-based CAD programming to take advantage of standardisation to handle the selection, sizing, layout and (potentially) pipe routing for Low-Pressure Hot Water (LPHW) Plant Rooms in buildings. Our approach combines automation and interactivity. From a simple specification of the Plant Room geometry (an orthogonal polygon with known obstructions, openings and external walls), and the heating load in kW, our software proceeds through a number of steps. First, the number and size of standard modular boilers, pumps, etc., are determined from the heat load. Then, a compatible optimising 3D variational solution is generated, using Constraint Logic Programming. To do this, we firstly enumerate a satisfactory topological solution, and then refine it to form a compatible geometrical solution. The final step generates pipe routes, using optimisation techniques to minimise the length of pipes and the number of bends. The solution obtained can be modified or improved by the designer, for which we have interactivity. Modifying the topology of the solution or the geometry of the Plant Room is done directly through the graphic interface, e.g. modifying a boiler position is done by dragging; the system automatically updates the 3D model including the pipe routing while maintaining all the design rules. The solutions generated by our prototype have been tested against conventional solutions in a benchmarking exercise. Advantages have been underlined and suggestions for further development have been made.
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Building Services Standard solutions: variational generation of Plant Room layouts
2001Co-Authors: Benachir Medjdoub, Paul Richens, Nick BarnardAbstract:Object-based CAD programming is used to take advantage of standardisation to handle the schematic design, sizing, layout and (potentially) pipe-routing for LPHW (Low Pressure Hot Water) Plant Rooms in buildings. From a simple specification of the Plant Room geometry, and the heating load in kw, our software proceeds through a number of steps. First the standard number and size of modular boilers, pumps etc. is determined from the heat load. Then a compatible optimising 3D variational solution is generated, using Constraint Logic Programming. Our approach is highly interactive. Modifying the topology of the solution is done directly through the graphic interface, e.g. modifying a boiler position is done by dragging; the system automatically updates the 3D model including the pipe-routing while maintaining all the constraints, and hence the validity of the design.
Benachir Medjdoub - One of the best experts on this subject based on the ideXlab platform.
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Building Services Standard Solutions
Computer Aided Architectural Design Futures 2001, 2020Co-Authors: Benachir Medjdoub, Paul Richens, Nick BarnardAbstract:Object-based CAD programming is used to take advantage of standardisation to handle the schematic design, sizing, layout and (potentially) pipe-routing for LPHW (Low Pressure Hot Water) Plant Rooms in buildings. From a simple specification of the Plant Room geometry, and the heating load in kw, our software proceeds through a number of steps. First the standard number and size of modular boilers, pumps etc. is determined from the heat load. Then a compatible optimising 3D variational solution is generated, using Constraint Logic Programming. Our approach is highly interactive. Modifying the topology of the solution is done directly through the graphic interface, e.g. modifying a boiler position is done by dragging; the system automatically updates the 3D model including the pipe-routing while maintaining all the constraints, and hence the validity of the design.
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A constraint-based parametric model to support building services design exploration
Architectural Engineering and Design Management, 2013Co-Authors: Benachir Medjdoub, Mokhtaria Benzohra CheniniAbstract:In this paper, we present a generative design approach using constraint-based programming to handle the space configuration for ceiling mounted fan coil systems in buildings. This work utilises and builds on the result from previous projects presented in Medjdoub et al. [(2003). Generation of variational standard Plant Room solutions. Automation in Construction, 12(2), 155–166] and Medjdoub [(2009). Constraint-based adaptation for complex space configuration in building services. ITcon, 14, 724–735.]. In Medjdoub [(2009). Constraint-based adaptation for complex space configuration in building services. ITcon, 14, 724–735], we have presented a hybrid approach using case-based reasoning and constraint satisfaction problem approach to deal with the space configuration and pipe routing of complex design problems for ceiling mounted fan coil systems in buildings. One of the limitations of the aforementioned approach is that the solution generated is defined only geometrically. In this work, we have redefined t...
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generation of variational standard Plant Room solutions
Automation in Construction, 2003Co-Authors: Benachir Medjdoub, Paul Richens, Nick BarnardAbstract:We have used the object-based CAD programming to take advantage of standardisation to handle the selection, sizing, layout and (potentially) pipe routing for Low-Pressure Hot Water (LPHW) Plant Rooms in buildings. Our approach combines automation and interactivity. From a simple specification of the Plant Room geometry (an orthogonal polygon with known obstructions, openings and external walls), and the heating load in kW, our software proceeds through a number of steps. First, the number and size of standard modular boilers, pumps, etc., are determined from the heat load. Then, a compatible optimising 3D variational solution is generated, using Constraint Logic Programming. To do this, we firstly enumerate a satisfactory topological solution, and then refine it to form a compatible geometrical solution. The final step generates pipe routes, using optimisation techniques to minimise the length of pipes and the number of bends. The solution obtained can be modified or improved by the designer, for which we have interactivity. Modifying the topology of the solution or the geometry of the Plant Room is done directly through the graphic interface, e.g. modifying a boiler position is done by dragging; the system automatically updates the 3D model including the pipe routing while maintaining all the design rules. The solutions generated by our prototype have been tested against conventional solutions in a benchmarking exercise. Advantages have been underlined and suggestions for further development have been made.
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Building Services Standard solutions: variational generation of Plant Room layouts
2001Co-Authors: Benachir Medjdoub, Paul Richens, Nick BarnardAbstract:Object-based CAD programming is used to take advantage of standardisation to handle the schematic design, sizing, layout and (potentially) pipe-routing for LPHW (Low Pressure Hot Water) Plant Rooms in buildings. From a simple specification of the Plant Room geometry, and the heating load in kw, our software proceeds through a number of steps. First the standard number and size of modular boilers, pumps etc. is determined from the heat load. Then a compatible optimising 3D variational solution is generated, using Constraint Logic Programming. Our approach is highly interactive. Modifying the topology of the solution is done directly through the graphic interface, e.g. modifying a boiler position is done by dragging; the system automatically updates the 3D model including the pipe-routing while maintaining all the constraints, and hence the validity of the design.
Paul Richens - One of the best experts on this subject based on the ideXlab platform.
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Building Services Standard Solutions
Computer Aided Architectural Design Futures 2001, 2020Co-Authors: Benachir Medjdoub, Paul Richens, Nick BarnardAbstract:Object-based CAD programming is used to take advantage of standardisation to handle the schematic design, sizing, layout and (potentially) pipe-routing for LPHW (Low Pressure Hot Water) Plant Rooms in buildings. From a simple specification of the Plant Room geometry, and the heating load in kw, our software proceeds through a number of steps. First the standard number and size of modular boilers, pumps etc. is determined from the heat load. Then a compatible optimising 3D variational solution is generated, using Constraint Logic Programming. Our approach is highly interactive. Modifying the topology of the solution is done directly through the graphic interface, e.g. modifying a boiler position is done by dragging; the system automatically updates the 3D model including the pipe-routing while maintaining all the constraints, and hence the validity of the design.
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generation of variational standard Plant Room solutions
Automation in Construction, 2003Co-Authors: Benachir Medjdoub, Paul Richens, Nick BarnardAbstract:We have used the object-based CAD programming to take advantage of standardisation to handle the selection, sizing, layout and (potentially) pipe routing for Low-Pressure Hot Water (LPHW) Plant Rooms in buildings. Our approach combines automation and interactivity. From a simple specification of the Plant Room geometry (an orthogonal polygon with known obstructions, openings and external walls), and the heating load in kW, our software proceeds through a number of steps. First, the number and size of standard modular boilers, pumps, etc., are determined from the heat load. Then, a compatible optimising 3D variational solution is generated, using Constraint Logic Programming. To do this, we firstly enumerate a satisfactory topological solution, and then refine it to form a compatible geometrical solution. The final step generates pipe routes, using optimisation techniques to minimise the length of pipes and the number of bends. The solution obtained can be modified or improved by the designer, for which we have interactivity. Modifying the topology of the solution or the geometry of the Plant Room is done directly through the graphic interface, e.g. modifying a boiler position is done by dragging; the system automatically updates the 3D model including the pipe routing while maintaining all the design rules. The solutions generated by our prototype have been tested against conventional solutions in a benchmarking exercise. Advantages have been underlined and suggestions for further development have been made.
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Building Services Standard solutions: variational generation of Plant Room layouts
2001Co-Authors: Benachir Medjdoub, Paul Richens, Nick BarnardAbstract:Object-based CAD programming is used to take advantage of standardisation to handle the schematic design, sizing, layout and (potentially) pipe-routing for LPHW (Low Pressure Hot Water) Plant Rooms in buildings. From a simple specification of the Plant Room geometry, and the heating load in kw, our software proceeds through a number of steps. First the standard number and size of modular boilers, pumps etc. is determined from the heat load. Then a compatible optimising 3D variational solution is generated, using Constraint Logic Programming. Our approach is highly interactive. Modifying the topology of the solution is done directly through the graphic interface, e.g. modifying a boiler position is done by dragging; the system automatically updates the 3D model including the pipe-routing while maintaining all the constraints, and hence the validity of the design.
Charles Wang Wai Ng - One of the best experts on this subject based on the ideXlab platform.
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Comparisons of soil suction induced by evapotranspiration and transpiration of S. heptaphylla
Canadian Geotechnical Journal, 2015Co-Authors: Ankit Garg, Anthony Kwan Leung, Charles Wang Wai NgAbstract:For a given evapotranspiration (ETr), both soil evaporation and Plant transpiration (Tr) would induce soil suction. However, the relative contribution of these two processes to the amount of suction induced is not clear. The objective of this study is to quantify ETr- and Tr-induced suction by a selected tree species, Scheffllera heptaphylla, in silty sand. The relative contribution of transpiration and evaporation to the responses of suction is then explored based on observed differences in Tr- and ETr-induced suction. In total, 12 test boxes were used for testing: 10 for vegetated soil with different values of leaf area index (LAI) and root area index (RAI), while two were for bare soil as references. Each box was exposed to identical atmospheric conditions controlled in a Plant Room for monitoring suction responses over a week. Due to the additional effects of soil evaporation, ETr-induced suction could be 3%–47% higher than Tr-induced suction, depending on LAI. The significance of evaporation reduced ...
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Experimental investigation of induced suction distribution in a grass-covered soil
Ecological Engineering, 2013Co-Authors: Charles Wang Wai Ng, K.x. Woon, Anthony Kwan LeungAbstract:Abstract Evapotranspiration from a grass-covered ground is known to induce suction by soil evaporation and grass transpiration. However, grass-induced suction in the ground when it is subjected to wetting and drying are not yet well understood. In this study, a laboratory test program was conducted to investigate the magnitude and distribution of suction induced by Bermuda grass growing in silty sand. In total, four test boxes compacted with silty sand were prepared, three of which covered with Bermuda grass while one test box was left bare as control. All the four test boxes were subjected to wetting and drying in a Plant Room with temperature and humidity controlled. Under identical atmospheric conditions and initial soil density and water content, peak suction induced within the root zone in grassed soil was 1.5 times higher than that in bare soil after 20 days of drying. A vertical suction influence zone was identified to be up to four times the root depth while the lateral suction influence zone was one diameter of ring collar away from the centre of the plot. Upon wetting, suction retained at depth right below the root zone in grassed soil was found to be 40% higher than that in bare soil. For three grass replicates that were germinated under identical atmospheric conditions, they produced different shoot lengths and induced different magnitudes of suction. No direct correlation between grass shoot length and grass-induced suction could be found.
N. M. Abdulloev - One of the best experts on this subject based on the ideXlab platform.
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Assessment of the Stress-Strain States of the Host Mass and Lining of the Rogun Hydroelectric Power Plant Room
Power Technology and Engineering, 2020Co-Authors: L. N. Gakhova, Kh. A. Safarzoda, N. M. AbdulloevAbstract:In this study, the numerical modeling of the stress-strain state of the host rock mass around underground hydraulic structures located at great depths in a mountain massif is carried out. According to the results, the regularities of changes in the stress-strain state of the host mass and the lining of the underground structure during stage-wise construction were established. Moreover, the considered approach enables to estimate the bearing capacity of the lining and the residual life of the structure. This is done using the results of the field data on the change in the convergence of the underground structure with the lining and the numerical analysis of the structural elements stress state.