DE20111018U1 - Double window for a passive house - Google Patents

Description

PATENT ATTORNEYS

SCHAUMBURG · THOENES ■ THURN

EUROPEAN PATENT ATTORNEYS

Schwörer Haus KG
Hans Schwörer Str. 8

KARL-HEINZ SCHAUMBURG, Dipl.-Ing.*

_ . DIETER THOENES, Dipl.-Phys., Dr. rer. nat.

72531 HohenStein GERHARD THURN. Dipi.-Ing., Dr.-Ing.

JÜRGEN LANDSKRON, Dipl.-Phys., Dr. rer. nat.

* until 6/2000

** approved by the DPMA

July 3, 2001

S 9119 DE-TNpm

Double windows for a passive house

The invention relates to a double window with an inner window sash, an outer window sash and a frame that holds both window sashes.

Such double windows are intended to provide good thermal and sound insulation. Other window systems used in passive houses are often very complex to manufacture and often do not achieve the desired values for sound and thermal insulation, especially in winter and summer operation.

As houses, particularly prefabricated houses, are being developed, particularly high demands are being placed on energy consumption over the entire year. In addition to good thermal insulation, the solar energy supplied from outside should also be used optimally for the house. A milestone in the development of prefabricated houses is the so-called passive house. It is characterized by the fact that it requires almost no external energy. Since the energy loss in a passive house occurs largely through the windows, particularly high demands are placed on such windows.

PO BOX 86 07<»8 _; 1)£&idiagr;6 _# 34 MCWCrfeNi · ^UERjilRChfeRSfrRAsSfi 3*. 01816* NtUN(JHEN
TELEPHONE* 089-*9878*97 · TELEPHONE 089*-988fj*14

e-mail: mail@stt-pat.de

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It is an object of the invention to provide a double window which has a high level of thermal insulation while being easy to manufacture and which is suitable for using thermal radiation supplied from the outside for a favourable energy balance.

This task is solved for a double window of the type mentioned above in that the inner window sash and/or the outer window sash has insulating glazing with at least two insulating panes each.

Conventional windows with insulating glazing are not designed as double windows. This is obviously because it was previously believed that a single window sash with insulating glazing, in which a suitable heat transfer coefficient is set, offers sufficiently high thermal insulation. The present invention takes a different approach by using two window sashes, i.e. an inner window sash and an outer window sash, of which at least one window sash has insulating glazing. Each insulating glazing has at least two insulating panes, which ensure high thermal insulation. The space between the two window sashes can be used to insert a device for shading or darkening.

Advantageously, the double window is manufactured as a prefabricated component.

An embodiment of the invention is explained below with reference to the drawing.

Figure 1 is a perspective view of a partially

cut double window, and

Figure 2 shows another view of the partially sectioned

Double window with the upper part of the window cut off.

Figure 1 shows the structure of the double window using a longitudinal section. The double window has an inner window sash 10 and an outer window sash 12. Each window sash 10, 12 has insulating glazing 14, 16 with at least two insulating panes 14a, 14b and insulating panes 16a, 16b. A cavity 18 is provided between the inner window sash 10 and the outer window sash 12.

The insulating panes 14a, 14b of the inner window sash 10 are held by an inner sash frame 20. This sash frame 20 is preferably made of wood. The insulating panes 16a and 16b of the outer sash 12 are held by an outer sash frame 22, which is also made of wood. However, it is also possible to manufacture this outer sash frame from plastic.

The inner sash frame 20 and the outer sash frame 22 are accommodated in a box frame 24. The parts of the box frame 24 facing the interior of the room, e.g. the frame parts 26, are preferably made of wood. The parts of the box frame 24 facing outwards, e.g. part 28, are preferably made of plastic. However, the combination of wood/wood and plastic/plastic can also be used. A lower cavity 30 of the box frame 24 is filled with insulating material, for example polystyrene. The lateral doubling 31 of the box frame is also preferably made of polystyrene. An upper cavity 32 of the box frame 24 can accommodate a device that serves to provide shading or darkening, for example a blind. This blind can be moved in and out of the cavity 18 between the inner window sash 10 and the outer window sash 12.

The inner sash frame 10 is rotatably and/or tiltably mounted in the box frame 24. The outer sash frame 12 is pivotably mounted in the box frame 24.

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Figure 2 shows a longitudinal and transverse section of the double window. Identical parts are designated alike.

The double window shown in Figures 1 and 2 has a very high level of sound insulation with a sound insulation value Rw > 45dB. The fact that two window sashes 10, 12 are connected in series provides increased protection against burglary. The thermal load acting on the double window is distributed between the two window sashes 10, 12, which ensures a long service life for the double window. The division into an outer section, e.g. parts 28, and an inner section, e.g. parts 26, for the double window offers a wide range of design options, i.e. different types of plastic-wood combinations and/or different colors can be used for the outer sections and the inner sections. The number of thermal bridges can be minimized by using the box frame 24. This enables excellent thermal insulation to be achieved.

In the double window according to the invention, the inner window sash 10 with insulating glazing has a heat transfer coefficient in the range of 0.8 to 1.3 W/m ² K, preferably in the range of 1.1 to 1.3 W/m ² K. This heat transfer coefficient or also called U-value (formerly k-value) indicates the heat loss through the surface. The total heat transfer coefficient is made up of a value for the glazing and a value for the frame. The smaller the coefficient, the higher the thermal insulation. The outer window sash with insulating glazing has a heat transfer coefficient in the range of 0.8 to 2.8 W/m ² K, preferably in the range of 1.1 to 1.3 W/m ² K. These measures provide very good thermal insulation, as is required for a passive house. It is possible to use the same heat transfer coefficients for both window sashes. In order to further optimize the thermal insulation properties, both window sashes can also have different thermal transmittance coefficients.

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As is well known, insulating panes with a low heat transfer coefficient also have a low g-value. This g-value indicates the total energy transmittance in percent. The double window according to the invention is designed so that when the inner and outer window sashes are closed, it has a g-value in the range of 25 to 50%, preferably in the range of 32 to 36%. In order to use solar energy for the house in winter when there is sufficient sunlight, the inner window sash is opened and the outer window sash is closed. This means that with the double window according to the invention, a g-value in the range of 50 to 70%, preferably in the range of 56 to 60%, is set.

When operating in the summer when the sun is shining, the inner window sash and the outer window sash are closed. This ensures that the house does not heat up too much.

For the entire double window, with the inner and outer window sashes closed, a total heat transfer coefficient in the range of 0.4 to 0.7 W/m ² K, preferably in the range of 0.55 to 0.65 W/m ² K, is achieved. A comparison shows the improved thermal insulation of the double window according to the invention. In a typical so-called low-energy house, the total heat transfer coefficient is around 1.4 W/m ² K; in the so-called three-liter house, the total heat transfer coefficient is 0.8 to 0.9 W/m ² K. The three-liter house refers to the total energy consumption of three liters of heating oil per square meter for one year.

The double window according to the invention has two window sashes connected one behind the other, each containing a double-pane insulating glazing. As a result, both values, namely the heat transfer coefficient and the g-value, can be optimally used. For example, on a cold winter night, both window sashes are closed and the very good U-value of approx. 0.6 W/m ² K comes into effect. The poor g-value of almost 34% (this results from 58% x 58%) plays no role at night or when it is cloudy.

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the sun, the inner wing is opened or tilted, thus the good g-value of 58% comes into effect. The relatively poor U-value of the outer wing, which now acts alone, is not relevant, since in sunshine the heat flow from outside to inside is significantly greater than the heat flow in the opposite direction.

Another advantage of double windows is the heat protection they provide in summer. This means that the building must not heat up too much when the sun shines on the window. If both window sashes are closed in this situation, the poor g-value prevents too much heating sunlight from entering the rooms. The good U-value prevents the flow of heat from outside to inside, which is caused by the heated outside air.

Claims (15)

1. Double window with an inner window sash ( 10 ), an outer window sash ( 12 ), and with a frame which holds both window sashes ( 10 , 12 ), characterized in that the inner window sash ( 10 ) and/or the outer window sash ( 12 ) has insulating glazing ( 14 , 16 ) with at least two insulating panes ( 14a , 14b ; 16a , 16b ) each. 2. Double window according to claim 1, characterized in that the inner window sash ( 10 ) with insulating glazing ( 14 ) has a heat transfer coefficient in the range from 0.8 to 1.3 W/m ² K, preferably in the range from 1.1 to 1.3 W/m ² K. 3. Double window according to claim 1 or 2, characterized in that the outer window sash ( 12 ) with insulating glazing ( 16 ) has a heat transfer coefficient in the range from 0.8 to 2.8 W/m ² K, preferably in the range from 1.1 to 1.3 W/m ² K. 4. Double window according to one of the preceding claims, characterized in that the two window sashes ( 10 , 12 ) have different heat transfer coefficients. 5. Double window according to one of the preceding claims, characterized in that when the inner and outer window sashes ( 10 , 12 ) are closed, a g-value in the range of 25 to 50%, preferably in the range of 32 to 36%, is present. 6. Double window according to one of the preceding claims, characterized in that when the outer window sash ( 12 ) is closed and the inner window sash ( 10 ) is open, a g-value in the range of 50 to 70%, preferably in the range of 56 to 60%, is present in order to utilize solar energy. 7. Double window according to one of the preceding claims, characterized in that a box frame ( 24 ) is provided as the frame, which holds the two window wings ( 10 , 12 ) at a distance from one another. 8. Double window according to claim 7, characterized in that the entire double window with the inner and outer window sash ( 10 , 12 ) closed has a total heat transfer coefficient in the range from 0.4 to 0.7 W/m ² K, preferably in the range from 0.55 to 0.65 W/m ² K. 9. Double window according to one of claims 7 or 8, characterized in that the box frame ( 24 ) has a cavity ( 32 ) on its upper side which accommodates a device for shading or darkening. 10. Double window according to claim 9, characterized in that the device for shading or darkening can be moved in and out in an area ( 18 ) between the inner window sash ( 10 ) and the outer window sash ( 12 ). 11. Double window according to one of the preceding claims, characterized in that the box frame ( 24 ) has inner frame parts ( 26 ) directed towards the interior and outer frame parts ( 28 ) directed towards the exterior, and that the outer frame parts ( 28 ) are optionally made of wood or plastic and the inner frame parts ( 26 ) are made of wood. 12. Double window according to one of the preceding claims, characterized in that in an operating state in winter with solar radiation the inner window sash ( 10 ) is opened and the outer window sash ( 12 ) is closed. 13. Double window according to one of the preceding claims, characterized in that in an operating state in summer with solar radiation, the inner window sash ( 10 ) and the outer window sash ( 12 ) are closed. 14. Double window according to one of the preceding claims, characterized in that it is used for a passive house. 15. Double window according to one of the preceding claims, characterized in that the sound insulation is in the range greater than or equal to 45 dB.