| 摘要 |
A flat solar collector apparatus includes an inner energy absorber plate having a absorber surface and energy transfer passageway connected to a storage unit. A transparent cover is secured in outwardly spaced and sealed relation to the absorber plate to define a sealed air space therebetween. The cover includes a pair of stacked, transparent sheets having light transmitting conductive coatings on the opposed sides or faces. Each conductive coating is provided with an electrical connector means for connection to a suitable power supply with an insulating spacer located between the outer peripheries defining a chamber filled with nematic liquid crystals. A D. C. or A. C. voltage source connected to the coatings controls the light scattering characteristic of the crystals and thereby changes the cover from a normally highly transparent to an increasingly translucent state, and thereby the energy transmittance of the cover. The voltage can be controlled manually or in accordance with a desired parameter of the energy collecting system to prevent damaging temperatures in the system. Metal oxide coatings on a collector cover also directly function to increase the absorber temperature for a given solar energy input.
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