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Characteristics of Particles and their Behaviour in Ventilation Air

The behaviour of particles in air flow is important for identifying those in various locations in ventilated space. The main reason for this study is to propose a new modelling concept to determine a realistic distribution of particles of different sizes in a space. The goal for this investigation is to divide particles into groups according to their behaviour in air and to improve the existing settling model. The growth of particle aerodynamic diameter in higher relative humidity is also presented.

Data Exchange for Thermal Modelling and Ventilation Simulation

Data exchange is the process by which information is transferred between the engineer and software and between one piece of software and another. Building and plant simulation involves handling large data sets describing constructional details, system components and reference data. The time required to prepare and check the data is significant and is one obstruction to the widespread use of simulation within the design process. Links between drafting systems and analytical tools offer an obvious way to speed up the process and reduce input errors.

Uncertainty, variability and sensitivity analysis applied to the ragena model of radon generation, entry and accumulation indoors

The application of a radon model is useful to understand the processes that drive the radon gasbehaviour from its sources to its accumulation indoors. Since in a given inhabited house the detailedknowledge of the values of all the parameters that affect indoor radon levels is not available, theresponse of the model has to be explored in a reference site in which all the parameters are supposedto be known. We call this site the reference configuration.

A first step towards an integrated approach for modelling indoor radon levels

Radon goes through four stages from its formation until it reaches a living environment: i) itsgeneration in the source medium, ii) its migration in the source medium, iii) its entry into a dwelling,and iv) its accumulation indoors. Many parameters of different origin take part at each stage, and mostof them are time-dependent. In this paper we discuss the requirements that an ideal model, whichconstitutes a Global Dynamic Radon Model (GDRM), should fulfil to predict indoor radon levels inliving areas of inhabited houses.

Numerical modelling of radon-222 entry into houses: an outline of techniques and results

Numerical modelling is a powerful tool for studies of soil gas and radon-222 entry into houses. It isthe purpose of this paper to review some main techniques and results. In the past, modelling hasfocused on Darcy flow of soil gas (driven by indoor-outdoor pressure differences) and combineddiffusive and advective transport of radon. Models of different complexity have been used. Thesimpler ones are finite-difference models with one or two spatial dimensions. The more complexmodels allow for full 3D and time dependency.

Dynamic Analysis Methods and Modelling. Application to Energy Performance Assessment

The application of system identification techniques to the energy performance assessment of buildings and building components requires a high level of knowledgeof physical and mathematical processes. This factor,combined with the quality of the data, the descriptionof the monitoring procedure and test environment, together with the experience of the user of the analysis software itself, can produce varying results from differentusers when applying different models and software packages.

Controller design for climate control in buildings using CLIM 2000

The CLIM 2000 software environment [1] was developed by the Electricity Applications in Buildings Branch of the French utility company, Electricité de France. This software which has been in operation since June 1989, allows the behavior of a whole buildi

Computer-aided boiler design

In 1993, the R & D Division launched the IntelChaud project with a view to improving the comfort provided by individual gas-fired boilers used for domestic hot water production. This study was conducted in partnership with two French boiler manufacturers and was therefore applied to two particular cases. The work performed for this study has led to substantial improvements in boiler control through the use of sophisticated numerical control systems.

The GENHEPI Concept: a New Methodology for Low Energy Consumption Building RenovationDemonstration Program

French buildings highly contribute to the total national energy consumption. In order to inflect theincreasing tendency, significant efforts have been encouraged by public institutions.Accordingly, the GENHEPI concept, hereunder described, aims at methodically investigate retrofitoperations to ensure an effective renovation of existing buildings. Its first phase consists in preparingand elaborating projects development by a global energy approach. Modelling and sensitivity studiesof various technical solutions permit this analysis.

A global approach of indoor environment in an air-conditioned office room

In this paper the authors in order to reach the objective of a global approach of comfort by a spatial statistical study of the various discomforts, apply a multi-criteria analysis based on ELECTRE II method adapted to the comfort of air-conditioned indoor environment.

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