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Taco's LoadMatch® System Keeps Edmonton, Canada Library Warm in Winter, Cool in Summer
The city of Edmonton in Alberta Province, Canada, has a new community library named after a beloved Canadian author and politician that is a LEED Silver-certified building (Canadian GBC standard). The Lois Hole Library, named after the late Lieutenant Governor of Alberta who was also a successful businesswoman, author and passionate supporter of public libraries, is the city's 2nd largest library at over 25,000 sq. ft., and it comes with a Taco LoadMatch® single-pipe system to heat and cool the two and half story building that serves 30,000 community patrons a month.
Designed by Barr Ryder Architects of Edmonton, the award-winning Lois Hole Library is a striking building, adorned with a massive, upswept prow-like entrance that opens into a spacious interior that is bathed by natural light and accented by warm colors. The building's dominant forms are its sloping roofs and counter slopes, which give the building the sense of floating in place. The large amount of glass used provides not only an open vista into the library but also allows a tremendous amount of light out into the surrounding area. At night the library glows like a "beacon of light" to draw the community to it.
The facility employs sustainable technologies to limit the environmental footprint, including in-slab radiant heating, heat pipe heat exchanger loop, low-flow and ultra low-flow fixtures, plus a rainwater collection and grey water system that supplies the building's urinals, toilets and exterior hose bibbs. The library provides two outdoor reading areas surrounded by a natural, drought resistant landscape of prairie grasses.
Mechanical and electrical systems for the Lois Hole Library were designed by Williams Engineering Canada Inc., in business since 1978 and with offices in Alberta and Manitoba Provinces and in the Arctic Northwest Territories. City maintenance personnel were brought in early in the design process, which allowed them to have an input on the systems being selected for the building. The city requested three options on mechanical equipment and Williams' preferred option was the LoadMatch-fan coil system for heat/cooling distribution.
City officials were at first skeptical of the unconventional LoadMatch system because they had not encountered it before. City officials were invited to a seminar where Williams Engineering explained how they had already used LoadMatch successfully in a previous project in Edmonton several years before: in an Islamic school on the city's northside, where it "worked from day one," says David Folster, C.E.T, Williams' lead designer for the Lois Hole project.
Kehoe Equipment, Taco's rep agency in Alberta, had introduced LoadMatch and its dedicated design software program, Hydronic Systems Solution (HSS) to Williams Engineering in a hands-on training session held at the design firm's offices, and the firm decided to employ it in the Islamic school project. "Everything told us it was going to work," says Folster, who loves the HSS system design program from the piping side. "I trust HSS," he adds. "It's one of my main design tools today."
HSS allows design engineers to size pipe and equipment, automatically calculate total loads and flows, and select and schedule equipment. As design changes are made, the software automatically recalculates. Like others who have used HSS, Williams Engineering's staff discovered that the software saves them considerable man-hours and reduces calculation errors in comparison to more traditional CAD drawing means.
In addition to the radiant in-slab provided by Uponor, the Lois Hole Library contains a two-pipe, direct drive fan coil system consisting of 32 IEC fan coil units with LoadMatch circulators within the building's ceiling space. Fan coils with small circulators was the preferred option for heating/cooling the library's interior space because of lesser material and labor requirements. LoadMatch systems eliminate the need for control valves and most balancing valves, and a single pipe distribution system reduces the amount of pipe needed.
The library has two mechanical rooms - a main room consisting of two Raypak gas-fired, condensing Hi Delta boilers along with Taco KV/KS and 1900 pumps, Multi-Purpose Valves, Suction Diffusers and a 4900 Series Air/Dirt Separator, and a fan room in the attic space. Delta Controls-supplied DDC controls throughout the building vary temperature based on outdoor conditions and occupancy demands. Controls are interfaced with the City of Edmonton's BAS system, which monitors some 130 city buildings, and can be accessed within the library through a local terminal or offsite via a WAN modem. The system also provides historical reviews, point trending/tracking, and dynamic analysis of control loops to ensure better control over temperature.
Opened to the public in September of 2008, temperature and humidity control in the library has never been a problem in a city that experiences plenty of 10-15°F days and nights in winter. There have been no issues with the LoadMatch circulators, and change outs to the filters in the fan coil units are handled routinely. "I like LoadMatch," says David Folster, "with its one pipe sized to carry the full flow throughout the building. For 2 1/2" pipe and above, LoadMatch makes perfect sense."
Information provided by Taco, Inc.
Click here for a PDF of the case study.