Moving Bodies Help Warm Stockholm Building

About 220,000 people make their way through Stockholm's Central Station each day. Down the block from the station construction is about to start on a 13-story building called Kungsbrohuset that will depend on the heat of those travelers' comings and goings to keep it least partially.

The idea is not new (read our earlier take on it here) but borrowed from the passive building concept. Among Kungsbrohuset's other green plans, detailed below, is a very big heat exchange system that, instead of venting extra heat generated from travelers, will recover it, exchange it to a water medium and pump it to the neighboring new building. When finished, Kungsbrohuset is set to conform to three environmental standards: the EU's GreenBuilding Programme, a voluntary system requiring buildings to strive for 25% lower energy usage than conventional standards; the local P-märkning, which includes quality specifications for indoor air and energy use; and a new standard, Byggabo, which will rate buildings as A,B, or C in energy use, environmental impact and indoor air quality and safety. Use of body heat will supply between five to ten percent of the heat energy needed at the 4,000 square meter office building, according to Kungsbrohuset project engineer Karl Sundholm. The goal, he said, it to make energy usage at Kungbrohuset just half of Swedish standards.

Even though the existing building now being torn down at the Kungsbrohuset site is just 20 years old, no one's yet complained about its demolition - some considered it to be Stockholm's ugliest inner city office building. The newer Kungsbrohuset will have just 130 parking spaces, but planned in-garage bicycle racks for all office renters as well as on-site changing rooms and showers. Jernhusen has also said it will include stations for "charging electric cars." Most importantly, perhaps, the company is trying as it contracts new tenants to plan for "synergistic" energy saving through car-and-bicycle pools and shared services such as messenger and mail. Via Kungsbrohuset (Swedish)