The picture shows a schematic diagram of a solar water heater drawn by a research study group of students in a school in Shaoxing, in which Figure A shows the traditional up-and-down adjustment, and Figure B shows the group design. (1) The variation of the sun's height at noon on different days of the year is caused by the ecliptic angle and the revolution of the earth; The smaller the distribution area of the same amount of sunlight on the absorption plate, the more concentrated the light and heat are; It is the best scheme to place the solar water heater by adjusting the light absorption plate to make it perpendicular to the sunlight.

(2) Shaoxing (about 30 N) is located in the north of the Tropic of Cancer, and the direct point of the sun is always located in the south. In order to get the maximum light, the light absorption plate of solar water heater is placed in the south, and the angle with the ground changes with the height of the sun at noon; From summer to the sun, H = 90-(30-23 26') = 83 26', and the angle between the absorption plate of solar water heater and the ground is complementary to the angle of the noon sun height, so the angle is 6.5; Sunlight is perpendicular to the light absorption plate only at noon.

(3) In the early morning of summer, the sun rises from the northeast of Shaoxing. In order to get the maximum light, the light absorption plate should face northeast.

So the answer is:

(1) Huang Chijiao; The revolution of the earth; Concentration; Vertical.

(2) South; 6.5 ; Noon.

(3) Northeast China.