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One of the largest energy sinks of a building is its Heating, Ventilation, and air-conditioning (HVAC) system. In commercial applications, HVAC systems account for 53.4% of the total energy use [1]. Within the CSL building, all spaces are mechanically heated nor cooled except the atrium. The mechanical system used in the building uses a geothermal source as a heating and cooling source for the HVAC system, which saves lots of energy. The ventilation strategy for the CSL building incorporates natural ventilation strategies with this mechanical system. When temperature, humidity and air quality conditions are favorable for opening windows, mechanical systems are locked out to conserve energy. In 2013, the CSL building has a positive net energy balance of 3,425 kWh, with an actual Energy Use Intensity (EUI) of 20 kbtu/sf-year. Of this, the Roof Top Air Handling Unit (AHU) used 10 kbtu/sf-year [2].
Text Reference:[1] U. E. I. Administration, “Preliminary end use consumption estimates,” Commercial Building End Use Consumption Survey, 1999, 2003.[2] “Center for Sustainable Landscapes.” A Brief History of The Living Building Challenge | Living Future, access.living-future.org/phipps-conservatory-center-sustainable-landscapes.Photo Reference:http://www.seithercherry.com/industrial-contracting/mechanical-systems/seither-cherry-mechanical-systems/https://www.wbdg.org/additional-resources/case-studies/center-sustainable-landscapes/https://www.phipps.conservatory.org/green-innovation/at-phipps/center-for-sustainable-landscapes-greenest-building-museum-garden-in-the-world/
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