In this paper a new procedure of determining the thermal resistance and the thermal capacity of multilayer walls is described. Its feature is the simulation of the thermal behaviour of the wall with subsequent parameter identification. The possibilities and limits of the procedure are shown and filustrated with results from an one- and a two-layer wall. A comparison of the described method with the wellImown averaging method shows the advantages in using dynamic analysis.
Modern, Message-Based operating systems with Graphic User Interfáces have spurred tremendous advances in software development. Usability, connectivity, and transparency of software has increased, as has the transfarability of the skills learned in one application to another.
Building Simulation software developers have ample opportunity to profit from the advanced technology that is now available, such as sophisticated edit controls, helpful concepts such as Cue Help and Wizards, and the powerful modularizations made possible by Dynamic Link Libraries.
This paper gives an overview and examples of varíous approaches to system simulation in buildings. Advantages and disadvantages of the different methods with respect to problems commonly encountered in building performance evaluation are described. Merits and drawbacks of the various methods and approaches are ülustrated by case study material. Finally some conclusions and directions for future work are indicated.
During the recent years a lot of models describing air flows in buildings have been designed by Researchers. These models, which are based more or less on simplified approaches coming from fluid dynamics, share a high complexity level because of complex geornetrical structure and. complex components of buildíngs. This complexity is the source of bad, experimental fitting, most of all because scale models don't correspond to the needs for fitting.
The aim of this study is to form the basis of a further analysis on night ventilation for cooling purposes in modern Swedish office buildings. An existíng Swedish office building with night ventilation has; been monitored and a complementary study on building energy end-uses with the help of the DOE-2 building simulation program. has been carried out.
An Anglo-French collaborative project is presently under way with the dual purpose : a) to collect high quality data sets for the empirical validation of thermal simulation programs of buildings and b) to develop and test advanced data analysis techniques. The aim is to identify and remedy the causes of poor predictive -performance in thermal programs of buildings. Two data analyses are presented in this paper: one is a time-domain technique developed by the Energy Monitoring Company in UK, and the other is a frequency-domain technique developed by the University Paris 12, France.
The impact of central forced-air heating and cooling system modifications on the levels of selected pollutants in single-family houses was evaluated by simulating pollutant concentrations due to a variety of sources in eight houses with typical HVAC systems. Simulations were performed with a multizone airflow and pollutant transport model and were repeated with the systems modified to include an electrostatic particulate filter, a heat recovery ventilator, and an outdoor air intake damper.
The current models of boilers and furnaces which are used in HVAC system simulation programs are primarily concerned with calculating the heat output of the device and its fuel consumption. The formulation of the models relies heavily on empirical terms which are derived from manufacturers' data or testing programmes.
Detailed simulation. of the combustion process involves solution of the flow-field. and chemical reaction rate equations by CFD simulation. The computational intensiveness involved renders this approach infeasible for integration into plant simulation. programs.
The Centre Scientifique, et Technique du Bâtiment and Gaz-de-France carried out a comprehensive study for providing professionals with dimensioning rules for hot water floor heating systems.
In the first phase we used a general purpose finite element analysis program called MARC and developed a three-dimensional mesh integrating the different floor heating components.
In a second phase, simulation results were compared to an experimental result data set created for this study from a test cell specially dedicated to heating floor assessment.
DOE-2 is arguably the most complex and comprehensive building energy simulation program available. However, not even DOE-2 addresses ali situations encountered in commercial office buildings. Most buildings contain one or more of the following situations:
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