SOLAR-CELLS AND ENVIRONMENT

Photovoltaic (PV) system discharges no carbon dioxide, which is the ca use for the greenhouse effect? because PV system converts dean energy from sun into electricity. There is discharge of carbon dioxide during the production of PV system, because electricity from thermal power g eneration is used. The discharge quantity is equivalent to 20.1g-C/kWh of carbon as carbon dioxide, when PV system is used for 20 years. The discharge from thermal power generation is 194.4g-C/kWh. As a result, replacing thermal system with PV system can reduce 174.3g-C/kWh. For example, 3kW PV roof top system can reduce about 550kg carbon dioxide every year. This amount is equivalent to reduction of 45.1% of dischar ge (1.22t) from a Japanese typical family of four.