Test Date : Friday,May 17th, 2002. sunny day
Test Area : Tangshan Solar Energy Research Institute,Tangshan City,Hebei Province,P.R.China.
Test Content     : Test Heating capacity of vacuum tube in sunny day under the sun.
Test Vacuum Tube : Length 1500mm, inside diameter is 37mm, outside diameter is 47mm,color is dark black.
Quantity of testing water : 1.2 liters (1.2kg)
Temperature of water before testing : +7℃(seven degree centigrade)
Environmental temperature : +27℃(twenty-seven degree centigrade)
Temperature under the sun : +30℃(thirty degree centigrade)
Test Start on 9:45 a.m.

AFTER ONE HOUR

water temperature inside vacuum tube : +45℃(forty-five degree centigrade)at 10:45 a.m.

AFTER TWO HOURS

water temperature inside vacuum tube : +70℃(seventy degree centigrade)at 11:45 a.m.

AFTER THREE HOURS

water temperature inside vacuum tube : +86℃(eighty-six degree centigrade)at 12:45 p.m.

AFTER FOUR HOURS

water temperature inside vacuum tube : +108℃(one hundred and eight degree centigrade) at 13:45

TEST IN THE CLOUDY WITH SMALL RAIN DAY.

Test Date : May 15,2002.Wednesday. Cloudy and rainy day.
Test Area : Tangshan Solar Energy Research Institute,Tangshan City,Hebei Province,P.R.China.
Environmental temperature : +21℃(twenty-one degree centigrade)
Testing quantity of water : 1.2 liters (1.2kg)
Testing water temperature before test : +6℃(six degree centigrade)
Vacuum tube length is 1500mm,inside diameter is 37mm,outside diameter is 47mm,color is dark black.

TEST START AT 9:50 A.M.

At 10:50 a.m. water temperature is up to 19℃(nineteen degree centigrade)

At 11:50 a.m. water temperature is up to 23℃(twenty-three degree centigrade)

At 12:50 p.m. water temperature is up to 26℃(twenty-six degree centigrade)

Test Data explain our vacuum tubes heaing capacity and quality etc.