[填空题]
An ideal air condition y:h52 ,cahm0w-nhb/3hop lujer kenw3,di v. ey+seps the temperature inside a room at 21$^{\circ}\,C$ when the outside temperature is 32$^{\circ}\,C$. If 5.3 kW of power enters a room through the windows in the form of direct radiation from the Sun, how much electrical power would be saved if the windows were shaded so that the amount of radiation were reduced to 500 W? W
