The new house features a set of automatically operated blinds that prevent it overheating when the sun is too hot for the plants together with a system that blows a continuous stream of cool air over the plants. The main design aim of the house is to allow maximum light transmission. To this end the glass is of a special low iron type that allows 90% of the ultraviolet light in sunlight to pass. It is attached by high tension steel cables so that no light is obstructed by traditional glazing bars. To conserve energy the cooling air is not refrigerated but is cooled by being passed through a labyrinth of pipes buried under the house at a depth where the temperature remains suitable all year round. A design goal of the house is that the maximum temperature will not exceed 20 degrees Celsius.
Kew's collection of Alpine plants (defined as those that grow above the tree-line in their locale - ground level at the poles rising to over 2000 meters in the Alps), extends to over 7000 and as the Alpine house can only house around 200 at a time the ones on show are regularly rotated. Kew Palace is the smallest of the British royal palaces. The Palm House (1844–1848) was the result of cooperation between architect Decimus Burton and iron-founder Richard Turner, and continues upon the glass house design principles developed by John Claudius Loudon and Joseph Paxton. A space frame of wrought iron arches, held together by horizontal tubular structures containing long prestressed cables, supports glass panes which were originally tinted green with copper oxide to reduce the significant heating effect. The 19m high central nave is surrounded by a walkway at 9m height, allowing visitors a closer look upon the palm tree crowns.
A new treetop walkway opened on 24 May 2008. This walkway is 18 meters (59 ft) high and 200 meters (660 ft) long and takes visitors into the tree canopy of a woodland glade. Visitors can ascend and descend by stairs. The floor of the walkway is made from perforated metal and flexes as it is walked upon. The entire structure sways in the wind. The image to the left shows a section of the walkway and the steel supports that were designed to rust to a tree-like appearance to help the walkway fit in with its surroundings. Kew Explorer is a service that takes a circular route around the gardens, provided by two 72-seater road trains that are fueled by Calor Gas to minimize pollution. A commentary is provided by the driver and there are several stops.
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