An energy transmitting solar panel (12, 22, 32, 42, 52, 62) intended for invisible incorporation into a building, a part or component thereof, behind and in thermal contact with a climate shield (12, 21, 31, 41, 51, 61) on said building, a part or component thereof, is made of a heat-conducting material and has a substantial heat transmitting surface area and at least one through-going fluid impervious channel or duct (15, 25, 35, 45, 55, 65) embedded in or integrally connected with said panel for the flow of an energy carrying-capable fluid therein. The solar panel is mounted below and close up to a climate shield of a building so that good thermal contact is established there between providing excellent transmission of converted sun radiation to an energy carrying-capable fluid in the fluid impervious channel or duct.
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