Patent ID: 6311437
Filing Date: 2001-11-06
Classification: E06B,F21S

Abstract:
A pane system of a window which separates an internal room from an external environment and consists of an outer pane A and an inner pane B of transparent material each of which are bounded by a plane surface a.sub.A or a.sub.B, respectively, and by a surface consisting of a plurality of parallel, prismatic ribs positioned one upon another,where the window is vertical or is inclined by a window inclination angle .nu. relative to the horizontal plane and deviates with its direction by a window direction angle .DELTA..beta. from the south on the northern hemisphere or from the north on the southern hemisphere, respectively,where all ribs have identical cross-sections in the shape of a right-angle triangle and the ribs of the pane A and the pane B are facing each other and are interlocking in such a way that just a small gap remains between both of the panes,where the plane surfaces a.sub.A and a.sub.B are parallel to each other and the plane surface a.sub.A is directed to the external environment and the plane surface a.sub.B is directed to the internal room,where the ribs of the pane A and, respectively, of the pane B are bounded by a lower rib face s.sub.A and an upper rib face f.sub.A and, respectively, an upper rib face s.sub.B and a lower rib face f.sub.B,where the rib faces s.sub.A relative to the surface a.sub.A and, respectively, the rib faces s.sub.B relative to the surface a.sub.B form a basic prism angle .theta. and the rib faces f.sub.A relative to the surface a.sub.A and, respectively, the rib faces f.sub.B relative to the surface a.sub.B form the other basic prism angle .OMEGA.,wherein the improvement comprisesthat the rib faces s.sub.A are coated with layers R.sub.A specularly reflecting to the interior of the pane A and the rib faces s.sub.B are coated with layers R.sub.B diffusely reflecting to the interior of the pane B,that the inclination angle .alpha. of the longitudinal axes of the prismatic ribs relative to the horizontal within the window plane is determined bytan .alpha.=-sin .DELTA..beta./(cos .DELTA..beta..multidot.cos .nu.+tan .lambda..multidot.sin .nu.)withthe window direction angle .DELTA..beta. within the range -75.degree..ltoreq..DELTA..beta..ltoreq.75.degree.,the window inclination angle .nu. within the range 45.degree..ltoreq..nu..ltoreq.90.degree. andthe geographical latitude .lambda. of the application site of the pane system within the temperate climate of the range 30.degree..ltoreq..lambda..ltoreq.60.degree. of northern and southern latitudeand that the basic prism angle .theta. is determined by.theta.=.pi./2-.kappa.+arcsin{1/n.multidot.sin[.delta.. sub.0.multidot.cos(2.pi..multidot.d.sub.G /d.sub.J)+.zeta..sub.0 ]}withd.sub.G : the solar blockade period in days as well before as after the summer solstice during which no direct solar radiation is to penetrate the prismatic pane system,d.sub.J =365.25 days, the period of a year,.kappa.=arcsin(1/n), the critical angle of total internal reflection, withn: the refractive index of the pane material which is about 1.5 for common window glass and acrylic glass,.zeta..sub.0 =arctan(z.sub.0v /x.sub.0v), the rib elevation angle of the solar radiation vector, when the solar radiation vector is within the equator plane and within the cross-sectional area of the rib, that is the angle between the normal of the surface a.sub.A and the solar radiation vector at the equinoxes with the solar declination angle .delta.=0.degree. and at the mean solar daytime t.sub.v of the application site or, respectively, for the daytime angle .beta..sub.v =.pi./12 h.multidot.t.sub.v withx.sub.0v =-C.multidot.sin .nu.-cos .beta..sub.v.multidot.cos .lambda..multidot.cos .nu.z.sub.0v =-D.multidot.sin .alpha.+(C.multidot.cos .nu.-cos .beta..sub.v.multidot.cos .lambda..multidot.sin .nu.).multidot.cos .alpha.with.beta..sub.v =arctan{[E.multidot.(sin .lambda..multidot.cos .DELTA..beta..multidot.cos .lambda..multidot.tan .nu.)-sin .lambda..multidot.tan .DELTA..beta.]/(1+E.multidot.sin .DELTA..beta.)}C=(cos .beta..sub.v.multidot.sin .lambda..multidot.cos .DELTA..beta.-sin .beta..sub.v.multidot.sin .DELTA..beta.)D=(cos .beta..sub.v.multidot.sin .lambda.sin .DELTA..beta.+sin .beta..sub.v.multidot.cos .DELTA..beta.)E=tan .DELTA..beta./(cos .DELTA..beta.+tan .lambda..multidot.tan .nu.) and.delta..sub.0 =23.45.degree., the maximum solar declination angle of the solar radiation vector relative to the equator plane at the summer solstice.