But here comes the problem of energy conservation. This problem concerns not only the glass in large formats, but also domestic premises: apartments, houses, child care, etc. As a rule, through the wooden box on order (at subject to the application of ordinary glass), lost 40-50% of thermal energy, so all the major manufacturers of glass mastered the production of energy-saving glass. Giving the energy-saving properties of glass connected with drawing on his low-emission surface of the optical coating and the glass itself with such a coating has been called low-emissivity. These coatings provide a passage into the room shortwave, solar radiation, but prevents the exit from the premises longwave thermal radiation, for example, the heater (and therefore low-emission glass is also called selectivity). Characteristic energy is emissivity glass. Coefficient of thermal radiation is a characteristic of the surface rather than the whole body and it is the same physical characteristics, such as density, melting point, etc.
By emissivity glass (emission) to understand the ability of the glass surface to reflect the long-wavelength not visible to the human eye, thermal radiation, whose wavelength is less than 16,000 Nm. Emissitent surface (E) determines the emissivity glass (of conventional E-glass is 0.83, while the less selective 0.04) and, consequently, the possibility as it is reflected back into space thermal radiation. The cause of radiation lies in the movement of free electrons of atoms on the surface of the glass, and the density of moving electrons. Not all metals, well-conductive, have the property to reflect dlinovolnovoe thermal radiation. .
Inflorescences corymbose, with a diameter of 20 cm, consist of 10 – 12 sterilvnyh flowers, located on the edge, and a large number of smaller flowers in the center. If growing conditions are not favorable, the plants trail over the ground, but this did not detract from their beauty. In open, ventilated areas during the winter freeze, so the representatives of this species are planted in locations protected from cold drafts. This type of hydrangea is an excellent solution for creating a flower bed vertically, or to decorate the walls, or large-besedki.Gortenziya or garden (N. macrohylla) This is the most common garden plant of the world, who know a lot garden forms and varieties. The most popular are: species 'Quadricolor' (with yellow-cream leaves), Class 'Grandiflora', 'Lilacina', and 'Perfecta'. Interesting and unusual varieties 'Nigra' with black shiny stems and flowers of cream-colored, changes color to pink and purple and 'Altona' – Shade-grown with huge pink inflorescences to 30 cm diameter, large-leaved hydrangea less hardy and therefore more often it is grown in open fields in the south or in pot culture (in the middle lane), using for decoration or winter garden.
But this kind can not leave anyone indifferent gardener, and everyone wants to be in the garden at least one instance of such a plant. You can dig in the spring of each year with a pot plant in a flower bed, and fall to make it into the house, trying to create the conditions for a cool winter. However, with careful shelter for the winter hydrangea can overwinter in the street. How can protect the beauty of the frost? Most simple way – before the autumn frosts bush hill at a height of 20 cm and covered with a bucket of dry peat. Shoots, which will be above the shelter, can be cut. In the spring of carefully guard the gains on the shoots of WHO Vratna frost, or flower buds vymerznut. You can cover shrubs and greenhouse film nonwovens – lutrasilom, optionally in two layers. Lutrasil placed in the lower layer is closer to the plant, to avoid condensation and rotting plants.