IBPSA1995

There is increasing interest in Europe in the use of displacement ventilation and chilled ceiling coolingsystems. A modelling methodology is presented here that deals with the significantly different heat transfer characteristics of these systems compared with conventional all-air systems. The purpose of the work is to develop a room model that is computationally efficient enough for annual hourly simulation purposes and a nodal model has been developed that is intermediate in complexity between a single air node model and a CFD model.

This paper presents the concept of an "open" simulation environment for performance-driven designexploration as a multi-directional approach to computer-aided daylighting modeling. A prototypicalrealization of a Generative Simulation Tool for Architectural Lighting (GESTALT) for simultaneoustreatment of daylighting-related design and performance variables is introduced. Earlier studies demonstrated that GESTALT can operate in an "explicit" mode, using a fast-response computational module.

This paper deals with the problem of empirical validation of thermal performance computer programs. It begins with a brief review of a number of techniques which have been used as a measure of the goodness-of-fit between measured and predicted data in a variety of empirical validation exercises. Several inadequacies inherent in existing techniques are identified as, a) no attempt is made to take into account the severity of the validation test. b) none give a single measure of the success (or otherwise) of the test. c) isolation of sources of error are difficult.

Dealing with issues of acquiring and accessing design knowledge in the conceptual stage of the design process is the focus of this research. This research starts by presenting a brief background about the limitations of the available energy-based CAAD tools. It then provides an illustration and description of the entire architecture of the conceptual model, identifies its different components and explains the relationships and interactions among these components.