High Performing Buildings - Fall 2011 - (Page 60)

Above Overhangs over the south glazed areas reduce the amount of intense natural light and heat entering the facility during the summer months, reducing glare to occupants and decreasing the amount of mechanical cooling required. Right A hanging mobile/sculpture decorates the north side of the glass-enclosed atrium that connects the east and middle buildings. A conventionally designed office building with a similar usage profile to Golden Hill would typically use a centrifugal chiller-based cooling system. However, this system was energy modeled and rejected, as it would expend 10 times the energy of the evaporative cooling system on an annual basis. Since the first cost of the planned evaporative cooling system was comparable to a chiller-based system (assuming no mechanical refrigeration backup), initial cost outlays were not affected. In addition, the use of evaporative cooling in lieu of a chiller-based system levels the demand from the local power utility and eliminates costly peaking charges. Evaporative cooling also improves comfort levels for occupants through its use of 100% outdoor air and by adding 60 humidity during Denver’s dry winter months using standard evaporative cooling equipment. Some project team members were concerned that an evaporativeonly cooling approach would not sufficiently provide the necessary cooling on hot, humid summer days. Pressure mounted to install chiller backup to the primary evaporative cooling system. However, adding chiller backup would have increased capital costs substantially, which would have undermined one of the project’s core goals of delivering a high performance facility that would be cost competitive with conventionally designed office buildings. Beyond the initial capital costs, the back-up chillers would require regular maintenance and eventual replacement. Although a space was allocated in each building penthouse for chiller backup, no chillers have been installed. heating system to complement the proposed air-conditioning system. Although the building structure was strategically designed to harvest k e y s us taI na b Le featuRes Water Conservation low-flow indoor plumbing fixtures 1.28 gpf water closets 0.5 gpm lavatory faucets 1.8 gpm showers Recycled materials All new carpet contains 75% postconsumer recycled products more than 50% of all construction waste is diverted from the landfill Daylighting more than 90% of the office and conference spaces have views to the exterior Individual controls more than 90% of the individual offices and workstations have individual lighting controls Landscaping drought-resistant vegetation and gravel replaced grass and other high-water-use vegetation in 2008 and 2009 Other major sustainable features more than 75% of ongoing consumables, including paper, glass, plastics, cardboard, paperboard, metals, batteries and fluorescent light bulbs, are recycled Hydronic Heating The project’s mechanical engineers also sought to develop an efficient fa l l 2 0 1 1 HigH Performing Buildings

Table of Contents for the Digital Edition of High Performing Buildings - Fall 2011

High Performing Buildings - Fall 2011
Commentary
Contents
Manitoba Hydro Place
Maplewood Police and Court Building
Omega Center for Sustainable Living
Dockside Synergy at Dockside Green
Golden Hill Office Center
Letters to the Editor
Products
Advertisers Index

High Performing Buildings - Fall 2011

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