ArchiVision Directory

Below we discuss the most common thermal insulation materials. What are their good qualities and what Lambda values have these materials? It is important to know that: the lower the Lambda value is, the better the material insulates. Also true is when the insulation materials gets thicker from 5 cm to 10 cm, for example, that we should not assume that the thickness of 10 cm can isolat 2 times better. On the contrary, the thicker the better, but there is a weakening of the thermal insulation value when the same thermal insulation material get's thicker and thicker. For example: a EPS plate of 60 mm has a Lambda value of 0,085 W/mK, an EPS plate of 120 mm has a Lambda value: 0,035 W/mK. Go to our conclusion at the bottom of this page to see what's the best insulation material for now and in the near future! PUR (PU) (Polyurethane) Can be uses as solid plates and as a foam spray. PUR is a plastic material made from oil and has the disadvantage that it is highly flammab...

What is an anemometer (short definition) An Anemometer is an instrument with which the wind can be determined. Windmill with hemispheres This instrument was introduced in 1846 by the Irish astronomer Thomas Romney Robinson (1792-1882). This instrument is a rotating windmill with three or four hemispheres (cups) with a rotating shaft rods to be confirmed. The axis is approximately perpendicular to the direction of the wind measurement. The hemispheres are hollow inside. If there are only three hemispheres then they are present prepared at 120° apart. The windmill will rotate because the wind on the concave side exerts more than on the convex side. The motion of the rotating balls through the ashes transform into a dynamo with an electrical voltage signal. The rotation speed of the wind speed are derived. This wind speed is expressed in meters per second or kilometers per hour. Paddle wheel Another form of an anemometer is used to measure the speed of the air (mine shafts, air ...