Particle penetration through windows

Two aluminium windows were tested to determine the fractional penetration of airborne particles. Results show that mainly particles of 0.2 to 3 microns enter through both windows.

The exploitation of solar energy for energy-saving ventilation

Performance of solar systems used to preheat ventilation air was investigated through long-term (several years) measurements on three buildings in Czech Republic. Buildings and results are described.

Numerical and experimental investigation of the conditions in the double solar energy façade

Numerical modeling and on site measurements were applied to the ventilated double-skin glazed façade of the Moravian Library building in Brno (Czech Republic) to determine the air temperatures and velocities into the façade. Calculations show that supply

Thermal comfort - thermal mass : housing in hot dry climates

Results are shown on how to use the thermal mass of buildings envelope to ameliorate diurnal temperature swings in hot dry regions.

Estimation of air infiltration of buildings based on the degree of air tightness and climatic data

A method was developed to estimate annual air infiltration rates in houses from measured data (building envelope air tightness, wind speeds, indoor and outdoor air temperatures). It was applied to 6 houses and the results showed a close correlation with the results from existing air filtration models.

Assessing the energy impact of ventilation and infiltration in multi-unit residential buildings

The study was to evaluate energy use of ventilation system with supply in corridors and exhaust in wet rooms. The field test protocol was to measure energy use one day with corridor supply ventilation on, one day off, for a range of different outdoor temperatures in winter. When corridor supply is on, the internal pressure changes (although always negative) and infiltrations are modified.

A simple model to study ventilated facades energy performance.

Aims to supply a simple and useful tool for the analysis of energy performance of different ventilated facades typology. A steady state energy balance was applied to a control volume solving basic equations with finite element code with an iterative procedure, in order to simulate the studied sample. The different surfac3e and air mass temperatures are calculate for each step of the channel height, and the mass flow rate evaluated as overall natural draught.

Multi-dimensional heat transfer through complex building envelope assemblies in hourly energy simulation programs.

States that most whole building thermal modelling computer programs use simplified, one-dimensional, parallel path descriptions of the building envelope, which may generate serious errors in building load estimation for several structural and material configurations of building envelope components which have high thermal mass and/or two- and three dimensional thermal bridges.

Cost-effectiveness of increasing airtightness of houses.

Air infiltration through the exterior envelope of a residential building impacts significantly on the heating energy consumption and cost, especially in a cold climate such as Montreal's. Therefore to renovate existing houses to the level of new well-built houses in terms of airtightness will lead to a reduction of the heating energy costs. By considering the life-cycle energy consumption and the initial cost of renovation, and the CO2 tax credits, the paper estimates the cost-effectiveness of this type of renovation.

Integration of the envelope permeability measurement into the outdoor/indoor pollutant transfer process.

The study forms part of a research project performed by LEPTAB and ATMO Poitou-Charente within PRIMEQUAL program which targets the relation between the indoor and local outdoor pollution. According to many studies, outdoor pollution has a major influence on indoor air quality, airflow being the main factor linking the outdoor environment directly to the climate indoors. A precise regulation of the air flow entering the room is enabled by the mechanical ventilation system and this makes possible the control of the indoor air pollution concentration.