CAN PV OR SOLAR THERMAL SYSTEMS BE COST EFFECTIVE WAYS OF REDUCING CO2 EMISSIONS FOR RESIDENTIAL BUILDINGS?

摘要

This paper compares two solar systems, an actual building integrated, photovoltaic roof (BIPV) and a notional solar thermal system for a residential block in London, UK The carbon payback for the solar thermal system is 2 years, the BIPV system has a carbon payback of 6 years. Simple economic payback times for both systems are more than 50 years. Calculations considering the current UK energy price increase (10%/yr), reduce the economic payback time for the PV 1 oof to under 30 years.The costs to reduce overall carbon dioxide emissions using a BIPV roof are ?196/tonne CO2, solar thermal individual systems at ?65/tonne CO2 and community solar thermal at ?38/tonne CO2. The current spot market price for CO2 is ?15/tonne CO2 (20) Capital costs for PV systems in particular must be significantly reduced for them to be a cost-effective way to reduce CO2.