English

Several studies have shown that supply air filters in office buildings, schools etc. occasionally get wet due to weather impacts. The aim of this study was to investigate whether performance characteristics, such as pressure drop across the filter and filtration efficiency, change when two different kinds of air filters become soaked and dried. The filters used, were a fiberglass bag filter and a plastic fiber bag filter, each of filter class F7. The study showed that the filter getting wet did not affect the shape of the dried filter material of plastic fibers.

Several studies based on analytical models and numerical simulations have shown that it is difficult to control airborne particle movements in a ventilated room. However, more knowledge and information on particle characteristics and particle movements, in combination with new numerical simulation tools, have recently made it easier to estimate particle patterns. In the present paper new information is used to evaluate the role of filtration and ventilation in the particle elimination process.

This paper describes the CFD model implemented within a building simulation program (ESP-r). It gives results examples to demonstrate the application potential of the model to calculate local comfort conditions and air quality.

Operative temperature which takes in account air temperature and radiation is of great importance when one defines human comfort.This paper gives information about definition, calculation and measurement of operative temperature.

This paper demonstrates that the distribution and area of ventilation openings affects significantly the air flow rates in a hybrid ventilation system.

This paper intends to find a simplified method for the prediction of natural ventilation in a cross ventilated room . This method is based on the use of pressure boundaries instead of the modelling of a larger domain.

This paper presents an on-going research programme about the performance of a natural ventilation system in a 3-storey building (with 2 aparments in every floor) in Portugal.

An innovative thermal comfort meter has been developed. It can simulate the human body evaporative losses. The sensor has been calibrated in a climatic chamber with different air temperature, velocity and humidity.

This paper demonstrates the importance of the combined use of an energy simulation program and a CFD program for an accurate design of two low energy cooling systems : displacement ventilation and a combined chilled ceiling with displacement ventilation.

A simple conceptual approach to room surface convective heat transfer is presented, defining a global room heat transfer coefficient. It is applied to two room ventilation systems : mixing and cross-ventilation.