large building

This paper presents the new framework for the realization of reliable pressurization tests in Belgium and the provisions taken to widen the number of buildings where a valid pressurization test can be realized.

When conducting airtightness tests of buildings, you must ensure that all building parts to be measured have air connection, so that the test object can be considered as one single zone. This also applies to large buildings like office buildings, schools, old people homes, indoor pools, etc. with several floors and rambling floor plans. Openings that are too small for a constant air flow from the leakages to the measuring device can prevent an even pressure distribution.

One of the two air distribution systems serving the office rooms of a 25-year-old large office building was balanced in autumn 2002. The supply and extract air flow rates of 173 office rooms were measured before and after balancing. Before balancing, the air flow rates varied considerably from room to room and many of the office rooms were over pressurised. The average extract air flow rate in the whole of the building was 20.7 L/s.person and the standard deviation 11.0 L/s.person. The aim of the balancing process was to meet the design values dating from 1978.

This article focuses on the replacement air component for atrium smoke exhaust, including comparisons of three design approaches. The concepts are illustrated by case studies.

In this paper the author develops the key factors that influence the performance of ventilation systems mainly in large office buildings. Information for the efficient operation of these systems is provided.

The airtightness of a building envelope impacts upon the magnitude of uncontrolled air leakage and associated ventilation energy losses. A building's airtightness can be assessed using a steady state fan pressurisation technique. This paper describes a study on the largest building in the UK ever to have had its airtightness tested. Power law regression analysis revealed a good correlation between flow rate into the building and observed pressure differentials.

In large buildings, pollutants may be emitted locally and discontinuously what can result in time dependent heterogeneous pollutant concentration fields. Efficient ventilation solutions should provide the right amount of fresh air at the right place so as to minimise energy cost and discomfort. In this paper, a new ventilation strategy is developed. It is divided in several phases. First, pollution sources are identified with a minimisation technique and then the time dependent pollutant concentration is predicted.

This paper presents the concepts of partition by aero-dynamic means; mentions that vertical current partitioning, horizontal current partitioning and displacement ventilation (DV) are the main measures on partition in large spaces; introduces ways of achieving vertical current partitioning, horizontal current partitioning and DV and the former two ways' numerical simulation conclusions.

If the swirling airflow is formed in the room, the ventilation effectiveness in the room becomes better than by the other method, as the airflow pattern has the fixed direction and the stable airflow path is built up. To make swirl the room air, it is necessary to supply getting larger airflow rate toward outer zone from center. To supply such an airflow distribution simply is used the multi-openings square duct. The reason is that the supply airflow distribution of multi-openings duct has a tendency to increase toward the tip.

In this paper, the distribution features air-conditioning temperature field are discussed with numerical simulation methods for semi-opening large space building. Important influential factors, such as ambient air parameters space characteristics of semi-opening large space building and the method and parameters of air distributing, are presented.