Air temperature and velocity are the two main factors affecting the thermal comfort indoors. These two values can be easily obtained using computational fluid dynamic (CFD) simulations together with the turbulence kinetic energy value. This paper evaluates methods of calculating thermal comfort indices using CFD. Simulated results are compared against experimental data measured in a purpose build full-scale model room. The results show that CFD data can reliably predict thermal comfort values.

This paper reports on a field investigation of the effect of screening on the induced flow rate in solar chimneys. The solar chimney considered here was a roof solar collector (RSC). It is composed of CPAC monier concrete tiles, an air gap and gypsum board. Two RSC units were integrated into the south-facing roof of a centre single room house of 25 m3 volume. Different types of screening were considered, namely: mosquito net, square net, metal grille and nylon filter.

This paper compares the difference of HEPA/ULPA filter test standards between America andEurope from test procedures, aerosol types and its size, to air filter classification. Both of them adopt MPPS method as their trend. According to EN1822, it is recommended to combine the test rigs for efficiency test and leakage test in practice. Influence of different scanning velocity on sampling accuracy, leakage and efficiency test accuracy need further studied and reasonable scanning velocity should be fixed.

Ozone removal, concentration of ultrafine particles (2 to 64 nm), and VOCs were measured on sooty ventilation filters. A F8 class filter loaded by diesel soot particles in a motor laboratory and a heavily loaded F5 class filter used for 8 months in a bus service terminal were used in the tests. In addition, both filters were saturated with alphapinene vapor to examine possible formation of secondary aerosols by heterogeneous reactions. Both filters removed ozone effectively in the beginning. Then, the removal efficiency declined until it reached a steady state level in three hours.

This study is in the frame of indoor air quality from the particle pollution point of view and its goal is to determine the particle penetration factor for different common types of leaks which deteriorate the filter capacity of building envelope. The most important parameters for the particle penetration are: the crack geometry, the pressure difference and the particles diameter. CFD numerical simulations have been done for rectangular cracks with 0.2mm and 1mm height for 40mm and 94mm length, also changing the pressure difference between 4Pa and 10Pa.

AIRSECURE project develops a protective solution against airborne threats for airport environment. The development efforts are based on risk analysis, and the developed technologies include high efficiency particle filtration, chemical filtration, detection of aerosol particles and hazardous chemicals

Three different air purifying devices are compared in terms of their influence on indoor air quality. Two systems use ozonisation and ionisation. One system uses ionisation and special filter devices (manufacturer's specifications). In the case of ozone production the perceived intensity and the PD value will increase to inacceptable values. The chemical analyses shows that the increase aldehyde concentration is probably caused by surface reactions between material and ozone.

This paper reviews indoor air quality needs; then it addresses gas phase air cleaning (a little understood, little used in HVAC, high opportunity technology) - particularly by adsorption. Opportunities and limitations are discussed and the capital and energy cost impacts of use are detailed. The role of ventilation/IAQ standards is addressed.

A satisfactory indoor air quality (IAQ) relies, amongst other things, on the availability of clean ventilation air. The outdoor air cleanliness in many urban environments is far from optimum. Fine particles (FPs = 2.5 m) and certainly ultra-fine particles (UFPs = 0.3 m) feature prominently as hazardous constituents of common urban air pollution.

We have performed studies onboard cruise ship to study the particle number concentrations,the commonly used filters and the utilization of novel filtration technologies. We observed that the majority of particles in the indoor air of a ship - and this applies when the ship was sailing in clean or polluted outdoor air - are smaller than 1 micron). We also observed that the commonly used filters mainly filtered particles larger than 1 micron.