
A solar heat collecting apparatus wherein a heat-absorbing plate for absorbing the solar radiation is installed in a vacuum vessel, the solar heat accumulated in the heat-absorbing plate is transmitted to a working medium in a pipe connected to the heat-absorbing plate, an upper surface layer for passing the solar radiation irradiated on the heat-absorbing plate therethrough and reflecting the infrared radiation emerging from the heat-absorbing plate is formed on the upper surface of the heat-ab...











