High Turndown Yields High Marks at School With Fuel Reduction
Aerco. Roaring Brook Elementary School, Avon, Conn., was built in 1962, and although the school had gone through severalover the years, the remained outdated.The original mechanical room consisted of two cast-iron boilers and a separate gas-fired boiler to feed their indirect fired hot-water storage generators. The boilers were vented into a common chimney.
Officials at Roaring Brook knew that commercial heatinghad come a long way, but felt limited by the traditional terminal units in the hydronic system. Even with the growing cost of energy, combined with shrinking public education resources, they knew it was time to replace the school’s old, inefficient heating system.
Walter McIlveen Associates was commissioned to provide the school with hydronic and domestic hot-water heating to increase the system’s efficiency. The school’s hydronic system requires a supply water temperature (SWT) of 180°F at design conditions, so simply putting in any condensing boilers was not going to be enough. A solution was found with two AERCO Benchmark BMK-2.0LN high turndown boilers. Using Aerco’s BMS-168 boiler management system to communicate with the existing automation system gave the “intelligent” system the flexibility to supply space heating and domestic hot-water production most efficiently. The system’s venting was upgraded with plastic pipe for intake and AL29-4C stainless for the exhaust discharge. Both were run through the roof in small diameter piping to integrate into the building’s decor.
Immediately, the school noticed changes, such as the boilers cycling less frequently and the reduction of natural gas.
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