High Performing Buildings - Winter 2011 - (Page 41)

marc m. swendner, seton family of Hospitals Above  Hospital wings have 24 patient  rooms, which are divided into eight-room pods   that are centered around a nursing station.  Sustainable materials such as formaldehyde-  free compressed wheatboard and low- or  no-VOC paints contribute to good air quality. Left  Break rooms give the hospital’s  1,100 staff members a relaxing space to  rest with views of a nearby greenbelt and  downtown Austin. Each break room is positioned at the end of a building wing with  floor-to-ceiling windows. at least 30 years. The CCHP plant provides reliable electrical power with three levels of redundancy and enhanced power quality, chilled water and steam to the hospital. A hospital is a compatible partner for a CCHP plant due to a steady 24/7 operation and a base load steam requirement. Steam is used by the hospital for sterilization, Building enveloPe Roof Type High-albedo membrane overall r-value 23.7 reflectivity 83% with emissivity > 0.9 walls Type stone, metal panel and stucco overall r-value 8 (includes glazing) glazing percentage 18.7% Basement/foundation Basement wall insulation r-value 9 Basement floor r-value 2.4 windows u-value 0.27 solar Heat gain Coefficient (sHgC) 0.3 Visual transmittance 36%–47% location latitude 30° humidification, space heating and domestic hot water production. The plant consists of two independent grid feeds, a 4.3 MW natural gas-fired combustion turbine, a 900 ton absorption chiller and a heat recovery heat exchanger that converts the waste heat from the turbine into steam. The steam is sent directly to the hospital and is used to drive the absorption chiller depending on the hospital’s load profile. At a projected 63% average annual thermal efficiency, the CCHP plant is almost twice as efficient as a comparable coal-fired power plant and has significantly decreased CO2, NOX and SO 2 emissions. The plant is also equipped with a 1500 kW emergency diesel generator for backup power in case both grid feeds and the turbine are lost. The construction manager estimated that eliminating the need for a central plant (including chillers, boilers, emergency generators and associated equipment) would save $6.5 million. These savings funded many other sustainable features of Winter 2011 HigH the hospital. The hospital negotiated a rate structure with Austin Energy that will repay the construction cost of the CCHP plant over the 30-year contract period. During the first few months of operation the CCHP plant had a catastrophic turbine failure and power delivery problems, which primarily centered around the response of main breakers and the turbine to grid interruptions. After Austin Energy spent considerable efforts and expense to improve the reliability of the plant, the CCHP plant has performed flawlessly for the hospital for more than 18 months. The hospital pays a premium to Austin Energy (AE) to purchase “green” power that is produced from renewable energy sources, which covers approximately 87% of the hospital’s electrical consumption. Combined with the emissions reductions from the CCHP plant, the total atmospheric CO2 reduction is more than 6,000 tons per year. Performing Buildings 41

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

High Performing Buildings - Winter 2011
Commentary
Contents
Portland State's Shattuck Hall
Oberlin College's Adam Joseph Lewis Center
Dell Children's Medical Center
CMTA Office Building
EPA Region 8 Headquarters
Honda's East Liberty, Marysville Auto Plants
Advertisers Index

High Performing Buildings - Winter 2011

https://www.nxtbook.com/nxtbooks/ashrae/hpb_2015winter
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2014fall
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2014summer
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2014spring
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2014winter
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2013fall
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2013summer
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2013spring
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2013winter
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2012fall
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2012summer
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2012spring
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2012winter
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2011fall
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2011summer
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2011spring
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2011winter
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2010fall
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2010summer
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2010spring
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2010winter
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2009fallnew
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2009summer
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2009spring
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2009winter
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2008fall
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2008summer
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2008spring
https://www.nxtbook.com/nxtbooks/ashrae/hpb_2008winter
https://www.nxtbookmedia.com