IBPSA1995

The paper describes a component-based dynamic simulation of a variable air volume (VAV) air conditioning system. The model is based closely on the design of one floor of a real commercial office building in London. The model includes an air handling unit and a duct system incorporating pressure independent VAV boxes. The paper describes the simulation, environment used to test control systems and to develop fault; detection and diagnosis procedures and presents results of simulations that illustrate how the simulation can be used to study the interactions between control loops.

PowerDOE a new, PC-based building energy performance simulation tool, combines the full capabilities of DOE-2.IE with an easy-to-use, flexible WindowSTMgraphical user interface (GUI). PowerDOE is a collaborative effort between the U.S. Department of Energy's Lawrence Berkeley Laboratory (LBL) and the Electric Power Research Institute (EM). This paper describes the PowerDOE user interface and the methods used to unify the building description and building analysis process.

Two main modelisation techniques are the analytic and systemic methods. After a presentation of  each method applied to building simulation, this paper emphases the benefit of systemic modelisation for  multizone cases. Using a conceptual description of a  building issued of previous method, one particular  sub-system appears naturally, i.e. the thermal zone.  Then, the physical coupling of thermal zones can simply  be solved. Building description through data structures, required for thermal simulation, is easily reached.

 TRNSYS is a modular transient system simulation program that has been commercially available since  1975. The primary use of TRNSYS is to model  thermal energy systems. Although TRNSYS was  originally developed for use with solar thermal  applications, an effort has been made to broaden the  scope of TRNSYS by increasing the number of general HVAC components and improving the  usability of the building model. Some of the more  recently available HVAC models include the ASHRAE  Primary and Secondary Toolkits and FIVACSIM+  components.

This paper describes research related to the New Zealand Building Code. It reports a survey ofinternational approaches to building energy performance regulation. It also examines the use ofsimulation and other design tools by New Zealand building consultants.

Data for convective heat transfer coefficients (CHTC's) published in the literature tend to be for anisolated heated vertical plate, with few data based on measurements at room surfaces Accurate values of CHTC's for internal room surfaces are needed for heat transfer calculations in buildings using thermal models and also for room air movement calculations using CFD models. Most existing computer models use CHTC's that have been calculated for isolated surfaces. This work presents accurate convective heat transfer coefficients for a heated wall in a room.

CONTAM94 is an easily used, public domain airflow and contaminant migration analysis program.combining algorithms for modeling airflow and contaminant dispersal in multizone buildings. Itemploys a simplified graphic description of the building for both data entry and the presentation of simulation results. It runs on commonly available 4861 X class PC compatible computers with VGA graphics and MS-DOS. It can handle buildings containing a large number of zones.

"Bioclimatic Architecture" offers adequate inner thermal comfort for human use, while, responding to the climatic outdoor conditions with reduced heating and cooling loads. This demand. asks for prediction. and preevaluation of thermal performance of architectural design. solutions. The new German building-regulation sets legal limits to precalculated, yearly heating-loads / m2, considering solar gains through transparent building elernents.

This paper presents; the evaluation, of the impact of a CO2-based DCV system, which was performed bycomputer simulation. A subroutine was developed, and then integrated, using the Functional Values feature, within a model of a large existing office building, which was developed using the MICRO-DOE2 software, version E. Since the CO2-based DCV system has to be integrated with a conventional control system, which maintains the desired mixing air temperature, the impact on the indoor air quality and the energy performance of the building depends on the type of conventional control.

Three energy analysis programs (BESA-Desian, PC-BLAST and MICRO-DOE2. 1 D) were used by threeresearchers to evaluate the energy and cost savings in a larae existing office building located in Montreal. The purpose of this study was twofold: (1) to test the programs' capabilities to predict the energy performance of an existing large commercial building, using information normally available to an energy consultant, that is without additional and expensive monitoring, and (2) to test the programs' capabilities to evaluate the impact of several energy efficientmeasures.