AIVC - Air Infiltration and Ventilation Centre

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Ventilation windows and automatic blinds help to control heat and lighting.

In designing and constructing its new R&D Centre, the Tokyo Electric Power Company (TEPCO) had two main aims: to provide a comfortable working environment and to conserve as much energy as possible. To achieve these aims, attention focused on the control of heating and lighting, especially in perimeter zones near glazed areas. The major features included ventilation windows with integral automatically controlled blinds, and daylight compensation lighting controls. Together, these have significantly reduced heating and lighting loads

The impact of windows on residential energy use.

The goal of this work is to better understand the influence of window U-factor and solar heat gain coefficient on residential space heating and cooling energy use in the United States. We calibrated our simulation models with residential energy use data and evaluated the affect of window U-factor and solar heat gain coefficient on space heating and cooling energy use. U-factor and solar heat gain coefficient have a comparable impact on heating energy use, whereas U-factor has a minor impact and solar heat gain coefficient has a strong impact on cooling energy use.

Air flow through louvered windows in small rooms.

In equatorial warm humid climates, ventilation has been largely adopted as a major strategy for natural passive cooling. In those climates the use porous elements are common to allow for permanent ventilation as temperature rarely drops below 20°C. Nevertheless, the performance of many building components has not been thoroughly determined, making it difficult to predict buildings performance as ventilation rates, estimated in most simulation codes are often based on apertures typologies from temperate and cold regions.

Indoor climate of large glazed spaces.

In recent years large glazed spaces has found increased use both in connection with renovation of buildings and as part of new buildings. One of the objectives is to add an architectural element, which combines indoor- and outdoor climate. In order to obtain a satisfying indoor climate it is crucial at the design stage to be able to predict the performance regarding thermal comfort and energy consumption. This paper focus on the practical implementation of Computational Fluid Dynamics (CFD) and the relation to other simulation tools regarding indoor climate.

Measurements of window air leakage at cold temperatures and impact on annual energy performance of a house.

This study was initiated to determine the extent of cold temperature air leakage from operable windows available in todays marketplace and the impact that this has on the energy consumption of a house. During the heating season, changes in the window's leakage characteristics, as a result of thermal and pressure effects, were to be included. At two laboratories, air-leakage tests down to-30°C were performed on 35 windows, enough to reach some general conclusions about performance.

Energy efficient window treatments.

Most building owners spend billions of dollars to outfit windows with drapes, shades, or blinds. Only a small fraction of this expenditure is ever targeted towards energy-efficient systems. Increased numbers of pleated, cellular shades with R-values presented In the R-3+ range are now in the marketplace. Foam plugs have been successfully used in many regions for low-cost, high R capability. The following elements shall be compared with respect to economic, utilitarian, thermal, and moisture issues: