SPR 2018

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hydronics/ case study W hen the Hotel Statler opened in downtown Los Angeles, California in 1952, it was the largest post-depression construction project in the United States. One of the major features of the $25-million project was that its 13 stories were "entirely air conditioned" — the pinnacle of a modern hotel in the early '50s. Today, a 73-story glass and steel skyscraper stands in the footprint of the old hotel, its distinctive rooftop spire making it the tallest building west of Chicago, Illinois. HIGH-EFFICIENCY HVAC Efficient use of energy within buildings is a primary focus of industry guidelines. The Wilshire Grand Center design team worked with energy consultant Glumac to perform extensive energy modeling to design the glass façade, which informed the design of the HVAC and lighting systems — the two biggest energy users within a building. Working with AC Martin Archi- tects and general contractor Turner Construction Co., ACCO Engineered Systems completed the design of the hydronic HVAC system that would achieve LEED Gold status. The HVAC system features a central plant with high-efficiency chillers and condens- ing boilers that supply chilled and hot water to the 2.1-million-square-foot building. Relying on its longstanding relationship with Dawson Co., a Bell & Gossett manufacturer's representative, ACCO specified Bell & Gossett pumps and products for the Wilshire Grand's HVAC system. "A major challenge on the project was that construction had to begin prior to completion of the design — and the budget was already set," said John Boncich, senior vice president, ACCO Engineered Systems. "We knew support from the Dawson and Bell & Gossett teams would be important from a technical standpoint and also in meeting critical milestone dates." BELL & GOSSETT'S ROLE The 1,100-foot-tall building is an- chored by a seven-level podium structure that houses retail, restau- rants, meeting rooms, ballrooms and a swimming pool. On top of the podium is 400,000 square feet of office space. Bell & Gossett's 300 psig working pressure VSX and e-1510 pumps supply chilled and hot water to the podium and office levels, and standard working pressure VSX pumps serve the thermal energy storage system on the podium's second level. The TES charges a large water tank overnight to reduce the number of chillers needed to operate the building during the day. "Besides the versatility and robust- ness the VSX brings to a high-efficien- cy hydronic system, it's easily service- able and its compact design takes up less space in the pump room," said Manual Masso, Dawson Co., vice presi- dent of commercial sales. "Decreasing the size of mechanical rooms means more saleable space, and that's a prior- ity in all commercial building projects." Bell & Gossett AHRI 400-certified plate and frame heat exchangers iso- late the building's pressure zones from each other. Other Bell & Gossett equip- ment for the HVAC system includes air separators and expansion tanks that increase and decrease pressures in the hydronic system in response to changes in building temperature. The Intercontinental Los Angeles Downtown hotel, with about 900 rooms on floors 31-66, a 70th-floor sky lobby and bars and restaurants on floors 69 and 71, occupies the building's tower structure. Inside the mechanical room on the 30th floor, 300 psig VSX pumps provide climate comfort to the hotel guest rooms via four pipe fan coil units and air handlers. B&G Series e-90 inline pumps, designed specifically for commercial hydronic systems, provide radiant floor heating and cooling in the ground- floor lobby and in the sky lobbies. BEYOND THE BUILD Once the HVAC system was in place, the next steps were to test the system and train building personnel on their operation. Dawson Co. conducted equipment training for maintenance and other personnel on the 18 Bell & Gossett products prior to the building opening. "It demonstrates the support that B&G brings to the table," Masso said. With nearly two dozen skyscrapers being built in the city of Los Angeles, Korean Airlines' Wilshire Grand Center likely won't be the tallest building in the area for long. However, it stands tall as a symbol of the new way of thinking about commercial building, using an integrated design approach involving the fields of architecture, engineering and construction to achieve safety, efficiency and sustainability goals. CHECK OR CIRCLE #177 Bell & Gossett helps historic hotel meet energy- efficiency goals STANDING TALL WITH SUSTAINABILITY WILSHIRE GRAND CENTER: GARY LEONARD A 73-story glass and steel skyscraper stands in the footprint of the Hotel Statler, which opened in downtown Los Angeles, California in 1952. Its distinctive rooftop spire makes it the tallest building west of Chicago, Illinois. Bottom: Bell & Gossett pumps and products played an important role in creating sustainable HVAC systems for the new Wilshire Grand Center. HVACPproducts.com Spring 2018 \ HVAC & Plumbing Product News 33

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