Optimal selection and position of swirl air diffusers Dralldurchlässe optimal dimensionieren und anordnen

The author points out the importance of a good selection of the dimensions of swirl air diffusers, using data provided by the manufacturers. It also gives information about the method for deciding of their number and position in the room.

Cooling performance of ground-coupled air intake ducts

This paper presents temperature and airflow measurements proving that ground-coupled fresh air intake ducts can have a significant cooling effect. Measurements at two Norwegian schools with such ducts, Jaer School and Medi School, show that the actual cooling performance after a three-day warm period is about 100 Wh/m2 of exposed concrete surface in the duct, with air velocity passing the surfaces of about 0.15 m/s. Our calculations indicate that this can rise to at least 200 Wh/m2 by increasing the air flow rate during the night.

Impact of resident behavior versus ventilation system design in indoor air quality and human health

This paper describes a study of reduced performance of mechanical exhaust systems in 42 Dutch houses after several years of operation. It also describes the effect of reduced ventilation on air quality and the perception and use of the ventilation system by residents. The guanine contents of dust samples taken from the sleeping room were determined to assess the risk of allergy.

Building integrated ventilation - New Norwegian guide

A 64 page guide on building-integrated ventilation solutions has just been published in Norway. It is the culmination of 4 years of evaluation and experience from modern buildings, mainly schools with different forms of building-integrated ventilation systems.
This guide gives tentative conclusions about alternative system designs.

Room pressure for critical environments

The quantitative determination of differential pressure and airflow for proper room pressurization is an HVAC design area that has not yet developed a standard rule.In this article current design guidelines and field practices for room pressurization are investigated. Practical field tests were performed in two types of facilities: a tuberculosis research lab and a cell transplant unit.

Source book for efficient air duct systems in Europe

Ventilation, air conditioning and air heating systems are of vital importance for the health and comfort of residents and other building users. However, there exists a substantial body of literature that shows that HVAC systems performance can be greatly affected by inferior quality ductwork. To avoid these problems, it is important to pay greater attention to the design, construction, installation, and maintenance of ductwork systems, bearing in mind that the primary functions of the HVAC systems must be fulfilled.

Guidance and tools for chilled ceilings combined with a wet cooling tower

The combination of an open wet cooling tower with chilled ceilings is a CFC free, cheap and low energy cooling solution. The efficiency of this alternative to mechanical cooling is very dependent on climate. There is a need for specific tools to help designers to size the system and to estimate its energy and water consumption. A building simulation tool, called ConsoClim, has been used to predict the performance of this system for different French climatic locations, thermal inertia, internal loads and solar gains.

Parametric study in a linear atrium by using CFD : the impact of vaious parameters on thermal behaviour

The objective of this parametric study is to vary some parameters related to the conception of an atrium in order to analyse through CFD calculations their impact on the thermal behaviour during the critical summer conditions. The guideline produced are intended to help the architects especially at the first stage of the conception process.

A tool for thermal analysis of conceptual design

In contemporary architectural design, the indoor climate receives little attention. Most architects are not familiar with the typical problems and solutions involved in climate design. However, it is this relation that provides much control over the initial climate conditions and can prevent costly artificial solutions. As a result, many design decisions are made without insight into the consequences on the indoor climate.

Study on the thermal environment in buildings with large-scale atriums and large area of glass surface

The control of thermal environment is complicated in buildings with glass-covered atriums. Numerical simulation can play an important role in the heating, ventilation, air-conditioning (HVAC) design of atriums. Many researches have developed various computational fluid dynamics (CFD) methods to accurately predict the thermal environment in atriums. However, a simple, reliable and fast method to deal with complex building construction is more suitable for building designers and engineers to take as a routine assistant tool of HVAC design.

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