CumInCAD is a Cumulative Index about publications in Computer Aided Architectural Design
supported by the sibling associations ACADIA, CAADRIA, eCAADe, SIGraDi, ASCAAD and CAAD futures

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authors Mahdavi, A., Mathew, P., Hartkopf, V. and Loftness, V.
year 1996
title Bi-directional Inference in Thermal Design
source Design Computation: Collaboration, Reasoning, Pedagogy [ACADIA Conference Proceedings / ISBN 1-880250-05-5] Tucson (Arizona / USA) October 31 - November 2, 1996, pp. 133-143
summary This paper demonstrates a computational bi-directional energy modeling approach for building design development. Conventional simulation tools may be labeled as mono-directional in that they require a more or Iess complete design definition in order to derive performance indicators. However, in certain circumstances, it may be desirable to reverse this process: a bi-directional (or "open") inference mechanism would allow for the identification of those changes in the design variables that would accommodate a desired change in a performance indicator. The performance-to-design mapping process is an ambiguous one: the same performance (e.g. energy use of a building, temperature variations in a space) may be achieved by different design configurations (various wall and window dimensions/properties, building orientation/massing, etc.). As a result, the actual implementation of a bi-directional inference tool is a rather difficult task. The development described in this paper utilizes a preference-based approach that involves the formalization of various external or internal constraints and preferences (such as code and standard requirements, results of post-occupancy studies, individual priorities of designers and their clients, etc.) in terms of normalized numeric scales.

After a brief review of the underlying technology for the implementation of the inference engine, the paper demonstrates an actual design session using a bi-directional thermal simulation tool. Specifically, a use-scenario is described in which the designer explores the tradeoffs between various design variables (glazing area, glazing type, and floor mass) in view of the resulting energy performance of a typical residential building. The paper concludes with a discussion of the potential and limitations of the bi-directional approach toward active convergence support for performance-oriented design development.

series ACADIA
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100%; open Mahdavi, A. and Berberidou-Kallivoka, L. (1993) Find in CUMINCAD A 'Two-way Inference Approach' to Daylighting Simulation , Journal of the Illuminating Engineering Society, Winter 1993

100%; open Mahdavi, A. and Berberidou-Kallivoka, L. (1994) Find in CUMINCAD GESTALT: A Prototypical Realization of an 'Open' Daylighting Simulation Environment , Journal of the Illuminating Engineering Society. Volume 23, Number 2, Summer 1994. pp. 62 - 71

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100%; open Mahdavi, A. and Mathew, P. (1996) Find in CUMINCAD Implementation Strategies for Open Inference Design Environments , ITCSED '96 Conference, Glasgow, U.K. (to be published)

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100%; open Mahdavi, A., Loftness, V., Mathew, P., Brahme, R., Kumar, R., and Wong, N.H. (1996) Find in CUMINCAD Integrated Modeling of the Thermal Environment , Proceedings of the 1996 International Symposium of CIB W67 (Energy and Mass Flows in the Life Cycle of Buildings). Vienna, Austria. (to be published)

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100%; open Mahdavi, A. (1995) Find in CUMINCAD SEMPER: A Computational Tool for Active and Multi-Domain Design and Evaluation Support , CBPD-Report No. 95-04-01, Center for Building Performance and Diagnostics, Camegie Mellon University, Pittsburgh, PA (submitted to the U.S. Department of Energy)

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