Solar insulation

Non-transparent materials like cardboard structures or mineral wool can also be used in wall constructions for utilization of solar gains, when covered with a glazing instead of an opaque construction, see Figure 2.4.2. The efficiency of these systems is certainly rather low. The intention here is not to convert the wall into a solar collector but to use the solar gains to reduce the heat losses further down towards approaching the zero energy balance over the heating season. The absorbed solar energy is used mainly to raise the average temperature of the outer shell to the interior temperature level thus bringing down the average temperature gradient over the heating season. There will be no solar heating, but the insulation level will be increased without using too large material thickness.

Source: Fachverband TWD e.V. Gundelfingen, Germany

Figure 9.4.2 Principle of solar insulation: Solar gains and heat losses balance each other over the heating season

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