Holistic HVAC design

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Date: Apr. 2013
From: ASHRAE Journal(Vol. 55, Issue 4)
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. (ASHRAE)
Document Type: Article
Length: 1,612 words
Lexile Measure: 1420L

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The Segundo Services Center (SSC) is the final addition to the Segundo residential area master plan of the University of California, Davis (UCD). It provides services for about 1,800 students and connects a variety of buildings and spaces to form a vibrant student community in a sustainable way. These services include an academic advising center, computer center, recreation room, laundry room, service desk, mail center and convenience store. The SSC is also the home for student housing administrative services including residential education, facilities services, dining services, and a maintenance shop.

The SSC is a new three story 34,500 [ft.sup.2] (3206 [m.sup.2]) building that was completed and occupied in August 2011. The project is seeking LEED-NC 2.2 Gold and has participated in the California statewide Savings by Design program.

Energy Efficiency Measures

The project used a design-build delivery method with the contract awarded through a design competition. This allowed the team to have a holistic approach, with all disciplines collaborating to deliver a cost-effective sustainable design. The energy efficiency measures used in the project included:

* Hybrid chilled beam variable air volume (VAV) system. One 100% outdoor air (OA) AHU was used to serve the internal spaces through a conventional VAV system and provide primary air to the chilled beams for the perimeter spaces. The all-water chilled beam system allowed the total building cfm to be in the range of 0.5 cfm/[ft.sup.2] (0.24 L/[s x [m.sup.2]]), which resulted in substantial fan energy savings. The added pumping energy was still low enough that it didn't offset the fan energy savings.

* Heat recovery and indirect evaporative cooling systems on the main air-handling unit. An evaporative cooling system was added on the exhaust airstream, allowing the return air to be cooled to slightly above its wet-bulb temperature (66[degrees]F [19[degrees]C]) before being passed on to the energy recovery air-to-air heat exchanger. The combination of the evaporative cooling and the heat recovery allows outside air in summer to be cooled from 106[degrees]F to about 81[degrees]F (41[degrees]C to about 27[degrees]C). In the winter, the heat recovery system allows air to be heated from 24[degrees]F to about 51[degrees]F (-4[degrees]C to about 11[degrees]C).

* Demand control ventilation strategy implemented by installing a VAV box upstream of the chilled beams. Most high-occupancy spaces served by the chilled beams have their primary air requirements governed by ventilation requirements rather than by cooling demand. Carbon dioxide sensors were added to these spaces that added a demand control...

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Gale Document Number: GALE|A348647996