The energy that penetrates into the interior can not be fully utilized. It is therefore necessary t

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Solar gains and thermal bridge play an important meat mincers role in the energy balance of a passive house. Here will be described the details meat mincers of the reveal and the effect is compared to the distance of the window from the heat bridge and the solar gains of the visible surface of the facade, and which we lose profits due to the sunshade by wall corners. meat mincers Solar energy and heat gains
The Earth's meat mincers atmosphere meets an energy of about 1373 W / m 2. Unfortunately, we have this energy is not the full extent available. A portion is lost in the atmosphere. The longer the distance the sun's rays by the atmosphere, the greater the energy loss. In the winter, so more energy is due to the low sun's position on the horizon lost than in summer. When the sun is 15 above the horizon, the light incident on the vertical plane of the glazing solar energy could be about 560W. Inward penetrates only a portion of this energy.
We have selected a case in which the deflection of the rays from the plane glass 45 and the light transmittance of the glass is 0.5 (Solar coefficient). To compare this with the energy caused by the thermal bridge losses in the reveal, we must use the average value of output per month. meat mincers In Prague there in January (according to TZB-info) as only 43 hours of sunshine.
In Table 1 is listed, as in this specific case, the utility of solar energy decreases, and when to be taken into account for all relevant factors. Of course, there are values that apply in our particular case. Table 1: Losses in the utilization of solar gains. Solar constant 1373 W / m 2 energy meat mincers incident at a solar altitude of 15 above the horizon to the vertical meat mincers plane of the glazing 560 W / m 2 deflection of the beam by 45 from the glazing level 396 W / m 2 solar coefficient of 0.5 198 W / m 2 Average performance for Prague in the case of 43 hours of sunshine in January of 11.4 W / m 2 level of utilization of the heat gains 0.7 8.01 W / m 2
The energy that penetrates into the interior can not be fully utilized. It is therefore necessary to further process this energy. An advantage is if the building has great thermal storage capacity. This is taken into account in the step of utilizing heat gains. Also advantageous is a flexible heating system. The sun begins in a room of a passive house with low heat storage capacity and slow acting heating system to appear, then the room temperature increases so much that the user is likely meat mincers to open the window, even when the outside temperature is around zero.
As a practical example, I've selected a type Slavona PROGRESSION window, which is set in a sand-lime masonry with insulation through a contact thermal insulation system. The visible face of the frame on the outside is minimized and, in addition of a more stable material, so we can close the window bordering the visible surface of the facade and to excessive degradation of the surface concerned by environmental conditions.
In the graph 2, the thermal bridge in the reveal (blue) and in the sill (red) is shown. In the reveal the thermal bridge meat mincers reaches both positive and negative values. This is generally caused by the coating of a heat insulating material over the window frame. Especially the windows progression of type allow us to cover the entire window frame with a heat insulating material. The smallest thermal bridge arises here when the enclosure of the window frame is at a distance of about 110 mm of visible surface of the facade.
In Graph 3, you can see the influence of the thermal bridge and the shading of the glazing by the wall corner. In this case, there is a window of the type PROGRESSION (dimensions of the window 1.2 x 1.5 m). Both influences are listed in watts, so that we can review it and add the ideal distance of the window frame of the visible surface of the facade. It is clear that the influence of shading increases linearly. As to the heat bridge, this is the smallest, when the window is about 110 mm of visible surface meat mincers of the facade. If both factors are added, and the lowest losses are achieved when the window is 70 mm away from the outside show surface of the facade. However, the other values are almost identical. A similar result is obtained when the slot within a distance of about 50mm to 110mm of d