DE2647337A1 - Double glazing with reversible heat flow compensation - has partitions between panes to localise heat or move it by convection - Google Patents

Abstract

The double glazed window checks loss of heat from indoors in winter, while permitting max. inflow of midday heat from outside and in summer reduces heat inflow from outside dueing the day and permits escape of heat at night. There are partitions rising between the double panes, to ensure that warm air remains on the warm side and cold air on the cold side when required. When required, warm air is convectively carried to the cold side, and vice-versa. Transformation from to winter to summer compensating action can be effected by using turning windows or by adjustable partitions. The partitions are made of glass or transparent plastic, with low heat conductivity, and may be thin or double-walled.

Description

Description of the patent application with the designation:

Insulating glazing: with winter-summer heat rectification. Introduction Due to the energy crisis in 1973, attention was drawn to our wasteful Energy consumption directed. Since almost half of our primary energy consumption is based on the building heating is omitted, it is important to pay more attention to the issue of insulation to give.

The invention aims at the heat insulating effect of Significantly improve insulating glass. In addition, there is a heat rectification effect strived for.

That means that in the Ninter the heat flow from the inside of the room to the outside is strong however, hinders the flow of heat from the outside to the inside (in warm midday hours) possible. In summer the (reverse) rectification effect causes the heat Do not flow into the room from the outside during the day, but flow well to the outside at night can.

State of the art double glazing, i.e. one behind the other of two (or more) panes of glass with a gap filled with air (or Gas) has been known for a long time. (Image 1.) The advantage compared to single glazing, there is better thermal insulation due to the enclosed Layer of air. However, the air does not act like still air. One recognizes this through Comparison of the thermal conductivity (or heat transfer coefficient) K of double glazing (3 in glass, 12 mm air, 3 mm glass) with the thermal conductivity of a 12 mm thick resting Layer of air. With the thermal conductivity of air, kL = 0.028 W / mE (watt per meter and degrees Kelvin) results in a 12 mm thick air layer K = 2.3 W / m2K. For however, the thermal conductivity of the double glazing mentioned is higher Values K E 3.3 W / m2K (= 2.8 kcal / hm2K, see Wilhelm Schnauk, Glas Lexikon, page 253, Georg D.W. Callwey, Munich, 1959). That is, the thermal insulation of the double glazing with an enclosed air layer of 12 mm is worse than that of a dormant one Air layer 12 mm thick. The explanation lies in the fact that the included Air does not rest. The warm air on the warm side rises and the cold air on the cold side it sinks, so that there is a circulation flow. (Image 1). It is the aim of the invention to have this convective heat transport in one direction to reduce, but to promote in the opposite direction.

Winter heat rectification Transparent partitions in the double glazing trapped air layer that extends from the outside to the inside of the glazing to ascend, ensure that the ascending on the inside of the glazing warm air remains near the inner pane while that on the outside sinking cold air remains on the outer pane. (Picture 2). In order to is the convective transport of arms from the inside to the outside is hindered.

However, the outside air at the glazing should be warmer at lunchtime than the indoor air, the heat is convectively transported from the outside to the inside.

(Picture 3).

Summer heat rectification Transparent partitions in the enclosed A layer of air that rises from the inside to the outside of the glazing, ensure that the warm air rising on the outer pane is close to the The outer pane remains and the cold air falling on the inner pane remains there. (Picture 4). This hinders the convective heat transport from the outside to the inside.

However, the outside temperature should fall below the inside temperature at night sink, the heat is convectively transported from the inside to the outside. (Image 5).

Connection of winter and summer heat rectification around double glazing There are two possibilities to use with heat rectification in summer and in winter at.

a) Nan uses double glazing with thermal alignment as a turning sash (Fig. 6), so that the glazing can be turned at the beginning and end of the heating season can.

b) You build the partitions adjustable so that the direction of the Partition walls can be adjusted at the beginning and end of the heating season. (Image 7).

The partition walls The partition walls must be transparent (e.g. glass or Plastic) and should have a low thermal conductivity. Would be beneficial it is to thermally insulate them to the adjoining glass panes and they very much thin or double-walled.

Blank page

Claims (3)

Claims The patent for insulating glazing is claimed with winter-summer heat rectification draws that 1) between double glazing, ascending separating walls ensure that in view of the undesirable te heat transport direction the warm air (gas) remains on the warm side and the cold air on the cold side and with regard to the desired heat transport direction, the warm air is transported convectively to the cold side and the cold air convectively to the warm side. 2) the conversion from winter to summer rectification by incorporation is effected as a turning wing. 3) the conversion from the Wintex; to summer rectification through adjustable Partition walls is effected.