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CELL List of air-filtering plants The first list of air-filtering plants was compiled by NASA as part of the NASA Clean Air Study,[1][2][3] which researched ways to clean air in space stations. As well as absorbing carbon dioxide and releasing oxygen, as all plants do, these plants also eliminate significant amounts of benzene, formaldehyde and/or trichloroethylene. The second and third list are from B. C. NASA researchers suggest efficient air cleaning is accomplished with at least one plant per 100 square feet of home or office space.[1] Plants[edit] Foliage[edit] Most of the plants on the list evolved in tropical or subtropical environments. See also[edit] Phytoremediation References[edit] External links[edit]

Steel skin uses solar radiation to heat buildings Tata Steel has launched the Colorcoat Renew SC® integrated solar air heating system. The system incorporates the company’s micro-perforated Colorcoat Prisma® pre-finished steel as the solar collector, and is installed as an additional skin on a building’s wall, creating a cavity between it and the wall. Negative air pressure within the cavity draws in pre-heated boundary layer air through perforations in the transpired solar collector’s surface. The heated air is then fed from the cavity either directly into the building as ventilation, or ducted into a HVAC unit where it is used as a pre-heater to the main heating system. This renewable energy system converts solar radiation to usable heat energy with up to 75 percent efficiency. Ten-year payback The company says that 1m2 of collector area can typically deliver 250kWh heat per year.