Describes four ventilation options for a 3-4 person dwelling of 100-140 m2 living area. These are: a simple transverse system conforming to State (Land) building regulations, a shaft system conforming to Standard DIN 18017 (old design), a central heat recovery based system conforming to Standard VDI 2088, and a central heat recovery/heat pump system. Presents the energy balances of the four systems with the aid of energy flow diagrams.
States that the new UK building regulations show a recognition of the importance of controlling the build-up of moisture and indoor air pollutants in the home. Concentrates on how designers can meet the need for adequate ventilation without wasting excessive energy.
An experimental study was conducted in Thailand to determine the thermal performance of twin glazed windows with dynamic insulation. The effects of blinds situated either between or outside the glazing were analysed. With an external blind, the heat transfer coefficient was 1.25 W/m2 deg C with natural convection and 0.6 W/m2 deg C for a flow of 20 m3/h (glass area 2.16 m2). The solar flux transmitted was evaluated analytically and experimentally depending on the blind's position. An economic study was performed on a six-storey air-conditioned building in Thailand.
Incidence of building occupant health and comfort complaints (tight building syndrome) have been linked to energy efficient, mechanically environmentally controlled sealed building technology and systems now characteristic to most office, commercial and publica buildings.
Naturally ventilated containers for international transport of hygroscopic commodities are now well established. Both theory and practice show that the greater the vent areas, the wider the range of conditions under which NVCs will succeed, but there are no established values for acceptable areas. Thetheory, conception and utilisation of NVCs are reviewed. Different vent configurations are tested for simulated and for real voyages.
Discusses the future prospects of domestic ventilation and whether mechanical ventilation will be necessary to satisfy requirements as windows become more airtight. Suggests use of centralized mechanical ventilation, with openable windows for summer ventilation.
The effects of different ventilation practices on levels of carbon monoxide and nitrogen dioxide from an unvented gas range were studied under controlled conditions at an experimental house near Washington, DC, USA.
For controlling and for setting ventilation standards to maintain acceptable indoor air quality, it would appear to be of greatest importance to determine the strength of relationships between contaminant concentrations on one hand and different rates of ventilation and how these rates are expressed on the other.
A major cooperative study of the effect of ventilation of timber flat (cold) roofs on combatting condensation and moisture accumulation has been undertaken in Denmark. Field measurements of moisture content in a number of test roofs over long periods and under different conditions are evaluated and conclusions drawn. They include the advice that, where moisture accumulation is a problem, it can be aggravated if roof vents are installed.
Login