water

Experimentally, it has been observed that the radon emanation coefficient, determined for geologicaland construction materials, depends principally on the porosity and water content.

Three different methods were used to measure radon concentration in groundwater near Baia Mare andin other places of touristic interest from Maramures, the northest district of Romania. The majority ofthe samples have been measured using two methods of alpha detection. The Radon Emanometermethod has a sensibility ofl 0.074 Bq/l (2 pCi/l) and it uses a device of Russian provenience. We madeseventy (70) different measurements with this device.

There is a currently growing interest in the effect of exposure to 222Rn, because it became recognised as an important “pollutant” factor of the environment. Possible lung cancer incidence due to exposure to environmental radon levels may thus account for

Dynamic simulation calculations were operated using TRNSYS software applied to a low energy house. This article is the second one of a serie of two. The first one was dealing with ventilation. This one mainly concerns heating system and domestic hot water production through a gas boiler. It also gives general conclusions, some of them dealing with ventilation.

Discusses building 'safe' houses, describes the decay chain of uranium 238 and the qualities of radon, and risks of developing lung cancer run by miners and householders. Figures for lung cancer in the USA are quoted. Details from three studies in Houston, Maine and Sweden are given. Discusses sources of radon, e.g. water, building materials, soil. A study of houses in Pennsylvania indicated that high radon concentrations occurred over Cambro-ordovician sediment rock. Discusses movement of radon from soil into dwellings.

For the transient analysis of the thermal and moisture conditions in multilayer constructions a numerical algorithm and a computer program based on the Crank-Nicholson method and quasi linearisation are formulated. Temperature and moisture content are used as transport potentials. In energy balance equations and conditions, convention and accumulation of moisture, the diffusion flow of water vapour, the capillary and surface diffusion flow of liquid water and the viscous flow of humid air and water are considered. The boundary layer and interfacial balance equations are derived.

Discusses standards and testing procedures for window air and water tightness. Describes apparatus used at the Technical Centre for Wood. Gives brief results of airtightness tests on 70 windows of different types subjected to a pressure of 10mm of water and of water tightness tests on 40 windows. Describes a test wall, designed to enable "hurricane" tests to be made. Appendices giveinformation on precipitation in France and discuss water-proofing products.

An earlier paper gave the flow to be expected through an open door from theoretical considerations. Describes model tests designed to check these theoretical predictions. The model used was 6.3% of full size and water was used instead of air for the flow medium. Concludes there is reasonably good agreement between model and theory.