Flexible or portable closure – partition – or panel – Plural and/or with rigid closure – Roll type
Patent
1982-08-09
1985-03-05
Caun, Peter M.
Flexible or portable closure, partition, or panel
Plural and/or with rigid closure
Roll type
E06B 908
Patent
active
045025223
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention concerns a heat-insulating roller-blind intended to be placed in front of a window.
Since the realization that the energy supplies are limited and that the cost of energy has risen considerably, it has become important to save on heating energy. New building standards have been developed for the purpose of increasing the heat-insulating capacity of new houses and measures have been accepted for additional insulation of previously built houses. According to the new constructon standards the window surface area is limited to a certain percentage of the facade surface. Furthermore, triple glazed windows are prescribed in order to increase the heat-insulating capacity of the windows and thus to further decrease heat loss through the window.
SUMMARY OF THE INVENTION
The purpose of the present invention is to save energy in buildings.
This purpose is achieved by means of a roller-blind constructed in.
The basic principle of the invention is that two or more thin sheets of a transparent material are joined to form a closed space so that the room-air can enter through a valve into the space enclosed by the sheets and, when the valve is closed, this gas remains inside and forms an immobile air layer of substantial atmospheric pressure with a heat-insulating capacity.
The effect of the roller-blind consists in that simultaneously as it lets into the room a major portion of the sunlight and thermal radiation, it prevents the heat from going out of the window.
Heat-insulating capacity in a structure is the resistance offered by the latter to the passage of heat. ##EQU1## which means that the lower the k-value of a structure the better the heat-insulating capacity of the structure.
Thus: k-value=2.9.
The k-value for a composite structure of the heat-insulating roller-blind according to the invention, may, by means of established calculation methods, by theoretically calculated according to the following:
______________________________________ Surface resistance m.sub.i + m.sub.u =
0.20
Resistance of the window pane =
0.01
Resistance of the air space of 2.5 cms =
0.20
Resistance of the window pane =
0.01
Resistance of the air space of 12 cms =
0.21
Resistance of the plastic sheet =
0.10
Resistance of the air space of 6 cms =
0.22
Resistance of the plastic sheet =
0.10
Total heat resistance = m =
1.05
k = 1/m = 1/1.05 = k-value = 0.95
______________________________________
m.sub.i and m.sub.u in the above table indicate the internal and the external surface resistance, respectively.
The roller-blind according to the invention is suspended from a curtain rod of conventional design above a window in a manner permitting it to be rolled up.
The roller-blind according to the invention is expected to remain pulled down during the day and for this reason it is transparent. The roller-blind is thus suitably manufactured of a glass-clear material of such hardness that the sheets are sufficiently stiff to form flat surfaces in front of the window when the blind is down, so that the view through the window is not distorted. Suitably the sheets consist of a plastic material with good thermal properties, so that they do not melt or catch fire through an accidental contact, for example with an electric heat radiator.
It is usually desirable that as great a portion as possible of the sun's luminous flux should enter through the window. A sheet therefore consists of a material which has the greatest possible transmission, 85 to 90%, in other words, a transparent material.
In certain cases (for example in sunny areas with cold nights) it may be desirable to bar the thermal radiation but to allow the entrance of the luminous radiation. In this case sheets of a plastic material are used which reflect (bar) the infrared light (=the thermal radiation). In such case the blind serves as a heat-insulator during the night.
According to the invention the roller-blind should have a surface which is 10 to 20% larger than the
REFERENCES:
patent: 1736075 (1929-11-01), Galley
patent: 2774421 (1956-12-01), Lion
patent: 2874612 (1959-02-01), Luboshez
patent: 3009498 (1961-11-01), Fohr
patent: 3113551 (1963-12-01), Korn
patent: 4039019 (1977-08-01), Hopper
patent: 4344473 (1982-08-01), Shore
Caun Peter M.
Lieberman Cherney S.
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