(20 12? Henan) uses solar cells to generate electricity in the sun, which is called photovoltaic power generation. Anyang started the "photovoltaic engineering" demonstration project.

(1) When the photovoltaic power generation system generates electricity, solar energy is converted into electric energy.

(2) The effective illumination time of a day is 8 hours. How many kWh does the photovoltaic power generation system generate a day?

This problem cannot be calculated, and the parameter needed is the peak sunshine hours, not the effective sunshine hours.

(3) If the photovoltaic power generation system is completed by a thermal power plant with a thermoelectric conversion efficiency of 30%, how many kilograms of coal does it need to burn? (calorific value of coal q coal =3.0× 107J/kg)

If the power generation is 60 degrees a day, the coal to be burned is: 60× 3.6×106/(3.0×107× 30%) = 24kg.

(4) Photovoltaic power generation process does not produce waste water, waste gas and waste residue, and it is a clean and renewable energy source.

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