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D Browne, K Menzel

Method for Validation of Building Simulation Results using Sensor Data

Abstract: In general, current Building Energy Simulation Tools are used for pre-construction design and comparison of designs rather than a full exact varying representation of reality. To provide the best level of detail full CFD analysis for the entire building would be required. However this is currently by far outside the scope of current computing power for a building energy system. Because these simulation tools are designed for comparison of potential designs and because of the difficulty in predicting occupant behaviour, very often the predicted results do not correlate with the real actual performance when buildings are in operation. From project experience encountered in the EU FP7 IntUBE project, a deficit has been encountered whereby the correlation between simulation results and real measured data is not entirely accurate. This paper discusses a method of validation, which will provide a means of comparing measured data (e.g. sensors and weather data), and simulated data (e.g. near future simulations). This method for validation of building simulation results initially involves a comparison of data from building simulation and respective measured sensor readings. From this comparison, value is added from correction of simulation results, and/or input to simulation parameters. Further worth can also be provided by gaining knowledge for creation of simulation profiles which are difficult to predict before construction & operation. Additional value can also be derived from identifying conditions of poor results and relevant factors which can be corrected. Simulation data and actual data is available from a housing unit in Barcelona Spain and research building in Cork Ireland.The expected result to be derived from this method is to give an indication of quality of simulated data results and provide feedback. If the difference between simulated and real data is too large, steps to improve results will be suggested. In future it is envisioned that automated adjustments may performed to simulation inputs to correct results. Aside from near future simulation validation, the tool may be able to provide long term commissioning feedback to detect and alert users to long term degradation of systems and possible maintenance or repair remedies.

Keywords: Simulation, Data Modelling, Validation

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Full text: content.pdf (109,859 bytes) (available to registered users only)

Series: w78:2011 (browse)
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Hensen J L M, Clarke J A

Integrated simulation for building design: an example state-of-the-art system

Abstract: "Most design practitioners will be aware of the emerging building simulation technologies and its benefits in terms of environmental performance assessment of building designs. As yet, few practitioners are able to claim expertise in the application of building performance simulation. This situation is poised to change with the advent of: performance based standards; societies dedicated to the effective deployment of simulation - such as the International Building Performace Simulation Association (IBPSA); appropriate training and continuing education; and the growth in small-to-medium sized practices offering simulation-based services. This paper attempts to outline the current state-of-the-art in integrated building performance simulation as a design tool. The ESP-r system (http://www.strath.ac.uk/Departments/ESRU) is used as an example where integrated simulation is a core philosophy behind the development. The current state and future developments are illustrated with examples. The importance of interoperability between simulation modules is discussed in the area of air flow, multiimensional conduction, lighting, CFD, and electrical power flow modelling. The use of integrated performance simulation for reducing the environmental impact of buildings is illustrated by a contemporary case study regarding the design of a high profile, low energy demonstration building. The design incorporates a range of energy demand reduction measures, as well as various embedded renewable energy supply systems. Finally, the paper will argue that for building simulation to penetrate the design profession in the near future, there is a need for appropriate training and professional technology transfer initiatives."

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Full text: content.pdf (721,713 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.environment (0.023588) class.impact (0.022970) class.education (0.022056)
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Permission to reproduce these documents have been graciously provided by Icelandic Building Research Institute. The assistance of the editor, Mr. Gudni Gudnason, is gratefully appreciated


Khait A,Noskov A,Alekhin V,Antipin A

Numerical simulation and visualization of air flow in ranque-hilsch vortex tube

Abstract: Visualization of air flow which appears in Ranque-Hilsch vortex tube is performed by numerical simulations using different turbulence models. The following turbulence models have been used during computations: k-?, k-? Realizable, k-? RNG, SST and SAS-SST. It was found out that only SAS-SST turbulence model can predict the existence of large-scale secondary vortex structures within the computational domain. The existence of large-scale secondary vortex structures is confirmed by different experimental studies.

Keywords: Ranque-Hilsch effect,vortex tube,computational fluid dynamics,CFD,flow visualization

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Full text: content.pdf (1,280,986 bytes) (available to registered users only)

Series: convr:2013 (browse)
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Pilgrim M, Bouchlaghem D, Holmes M, Loveday D

Visualisation in building design and analysis

Abstract: "Research on data visualisation is undergoing major developments in a number of different fields. These developments include investigating ways of applying visualisation techniques and systems for more efficient manipulation, interpretation and presentation of data. Research into applied visualisation has so far taken place in the fields of Computational Fluid Dynamics, Medicine, Social Sciences, and the Environment. In the built environment field however, the potential of new visualisation technologies to enhance the presentation of performance data from simulation programmes (of the type used by engineering design consultants, for example) has remained almost unexplored. Improvements in this area would lead to a better and more efficient use of these simulation programs and would facilitate the interpretation of such output data by construction industry professionals, leading to better, more informed design decisions. This paper presents an initial study on Data Visualisation and its effective use in the thermal analysis of buildings. Much of the current data visualisation in the engineering and scientific world focuses on very large data sets produced by applications such as FEA, CFD or GIS. As such the tools developed to date are often too expensive or not appropriate for the visualisation of the relatively smaller data sets produced by thermal analysis tools. The objective of the work summarised here was to develop a method of visualising the data produced by the thermal analysis tools which would run on an average desktop PC and be easy to maintain/customise and above all present the data in an intuitive manner. A workplace observational study of several engineers performing such an analysis revealed each was spending a significant amount of time manipulating the output within commercial spreadsheet packages. Further studies revealed the most common tasks were the inspection of predicted internal conditions, location of glazed elements transmitting significant solar radiation and the identification of high internal surface temperatures. Two applications were therefore proposed. The first is designed to automatically process the output within the spreadsheet environment. The second is designed to display the solution in three dimensions to aid spatial recognition and data navigation. The spreadsheet tools were developed over a period of several months and then released to all users of the analysis tools. The 3D tool was developed over a longer period and has been subjected to small group tests. Each tool was developed using Microsoft Visual Basic making them both easy to maintain and freely available. The 3D tool reads in flat text files produced by the analysis and automatically generates a framed HTML page with an embedded 3D VRML world describing the building and its results. This study shows that each of the proposed applications significantly improves some of the attributes associated with usability, namely; learnability, efficiency, memorability, errors and satisfaction. The spreadsheet tool increased efficiency and decreased errors but offered no real satisfaction. The 3D tool offers increased satisfaction but at present does not efficiently present all of the data required. Finally, It is possible to develop low cost Data Visualisation tools to improve the overall usability of a thermal analysis tool within a built environment consultantcy."

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Full text: content.pdf (404,505 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.social (0.027102) class.environment (0.018138) class.economic (0.016196)
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Permission to reproduce these documents have been graciously provided by Icelandic Building Research Institute. The assistance of the editor, Mr. Gudni Gudnason, is gratefully appreciated


Walter O’Grady, Marcus Keane

Specifiation Of An IFC Based Software Application To Support CFD Simulation

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Full text: content.pdf (1,052,713 bytes) (available to registered users only)

Series: w78:2006 (browse)
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