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Article-lagace.jpg

©2015 This excerpt taken from the article of the same name which appeared in ASHRAE Journal, vol. 57, no. 10, October 2015

Jacques Lagacé, P.Eng., Member ASHRAE

About the Author
Jacques Lagacé, P.Eng., is vice president, innovation at Bouthillette Parizeau Inc., Montreal, Canada.

A building in Montréal proves that attaining significant energy savings is possible using simple measures. Energy recovery, perimeter heating and flexible ventilation design are among the simple solutions used to reduce energy consumption at the Commission de la Construction du Québec’s (CCQ) headquarters. Unlike many modern buildings seeking to reap significant savings and reflect its awareness of sustainability, CCQ does not incorporate technologies such as solar or wind energy or geothermal systems in the design.

 

HVAC System Design

The 134,904 ft2 (12 533 m2) building features eight floors of office space for its 600 employees and a 2,210 ftsup>2 (205 msup>2) data center.

Data Center

Because it needs to be operational 24 hours a day, year-round for critical operations, the design began with a thorough analysis of the data center.

The resulting, customized design reclaims and effectively reuses the energy produced by the data center's six rows of powerful computers (300 kW, 40 racks).

In-row cooling systems are connected to a dedicated chilled water network. Advantages include reliability, capacity to absorb local servers' heat and the ability add more in-row AC units when additional servers are added. This system also allows for additional local cooling capacity for more densely occupied server racks since heat is not evenly distributed.

Data Center Redundancy

TIER-4 redundancy of the HVAC&R equipment is required, and the HVAC&R services configuration and equipment selection allow for uninterrupted services. The data center uses one of two independent, identical chilled water networks that combines a 65 ton (229 kW) capacity chiller (3.6 COP and 4-step modulation), variable speed pumps, heat rejection loops and a fluid cooler. If both chillers break down simultaneously, a control sequence is programmed to transfer the data center load to the 250 ton (879 kW) chiller designed to meet the remaining building load requirements.

Redundancy is also present on the pumping systems for the primary chilled water and heat rejection loops and for the fluid cooler fans. In fact, the fluid coolers were selected with an added capacity of 25% to compensate for any fan malfunction. As a last resort, two 4 in. (102 mm) chilled water fittings are installed to accommodate a rental chiller.

Chiller Systems

During the summer and for normal building use, a 315 ton (1108 kW) cooling capacity is required for outdoor air treatment, plug loads and compensation for envelope heat gains. To optimize infrastructure costs, the main chilled water network is designed to also use the backup 65 ton (229 kW) chiller when its use is not required by the data center. Because it is used regularly instead of being on standby, it wears at the same rate as the other 65 ton (229 kW) chiller, which increases reliability.

 

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