Solar houses are good for climate
This is the result of a study made by the German Solar Industry Association BSW-Solar.
The study was the first to compare the efficiency of maximum insulation and solar thermal energy as means to reduce a house’s CO2 emissions.
“Solar thermal heating concepts with high solar fraction values can save much more carbon dioxide emissions than the energy efficient buildings supported by the German federal government today. If houses with high solar energy coverage would be supported by the state in the same way as the energy-efficient houses, the government could reach their ambitious climate protection goals much more efficiently”, says Jörg Mayer, Managing Director at BSW-Solar.
Peter Rubeck, co-author and Director of the Bavaria-based Sonnenhaus-Institut completed with “The study is a basis for an objective discussion of the innovative and energy-efficient construction in the future – even against a background of higher delivery efficiency.”
The study examined three categories of buildings defined by the Kreditanstalt für Wiederaufbau (KfW development bank) – the energy-efficiency „KfW 70” , the “KfW 55”, and the “passive” house standards.Each of the types was equipped with four different kinds of systems to secure heating and warm water supply:from floor heating combined with condensing gas boilers and solar systems, through ventilation systems with heat recovery, solar systems with standard fraction and pellet heating up to solar panels with 60% solar coverage rate and pellet stove.
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