WALTHAM, MA - Bentley College, with one of the Top 50 undergraduate business programs in the nation according to the U.S. News & World Report, enrolls approximately 4,000 full-time undergraduate students each year. More than 80 percent of those students live in housing provided by the college. The college recently needed to add two additional dorms to its housing repertoire. When it came to heating and air-conditioning for the new dorms, A&E Mechanical of Salem, New Hampshire was awarded the contract.
“We were hired to install the heating and cooling system for the new facilities,” says Scott Campbell, of A&E Mechanical.
“In addition to installing the new boilers, we also piped and installed all the baseboard heating for the buildings.” For the new construction, Bentley College had originally specified 2 million Btu boilers – one for each building.
However, the design of these boilers was problematic as Campbell explains. “We were concerned that the 2 million Btu boilers specified for the project would short cycle, and not really be what the college wanted in the long-run,” says Campbell. “So we contacted Sweeney Rogers, a rep firm based in Franklin, Mass., that we do lots of work with.”
After assessing the situation, Sweeney Rogers recommended two smaller 750,000 Btu modulating boilers for each dormitory – both RBI Futera III boilers. Working in full modulating mode, each boiler would operate at a peak efficiency of 88 percent – which would save Bentley a considerable amount of heating fuel. The boiler room would be set-up so that the boilers would run alternatively, ensuring that neither boiler would become overburdened. “Sweeney Rogers was right on target with their recommendation,” says Campbell. “The Futera III offers a large capacity in a small space-saving design, greater overall flexibility, reliability, and a much higher efficiency rating than what was originally planned.”
The RBI Futera III is a finned copper tube boiler that operates in a full modulating mode with 3:1 turndown, supplying the precise amount of heat necessary to maintain the desired building temperature. The boiler has a very small footprint of less than 22-inches square, so two units would easily fit into the very small boiler room in each building.
There was a fair amount of pressure to get this building completed in time for the students’ August move-in date, which was another reason that the Futera III boilers were selected.
“The boilers were immediately available and very easy to install. It was really just a ‘plug and play’ installation without any jobsite boiler modifications or construction,” says Campbell. AE Mechanical installed two boilers in each building.
The system was then designed so that each boiler would fire on an alternate basis – one on, the other off. This would not only provide a regular cycle for the boilers, but it would also allow one boiler to be serviced without a heating loss to the facility if necessary.Not only was the project completed on time, but the boilers performed very well in their first semester away at college.
Read the attached .pdf document for more information.
PROVIDENCE, RI - Three steel tube boilers had been in service since the 1960s at Dexter Manor, a 10-story low income housing complex located in downtown Providence, R.I. None of the existing boilers was up to the task of providing heat and hot water to nearly 300 apartments, managed by the Providence Housing Authority (PHA), in Providence, Rhode Island.
“Failure to provide our tenants with heat and hot water is simply not an option,” said Gary Sprague, HVAC manager at PHA. “We have many elderly and handicapped people living in Dexter Manor who rely on our ability to provide heat and hot water.” The Providence Housing Authority wanted new, high efficiency, gas-fired boilers that could be tied into the existing baseboard heating system in use throughout the building. Besides providing heat and hot water, the PHA wanted a system that would be economical to operate in the long run.
For the project, six RBI high efficiency boilers were selected and installed. Two RBI Futera II hot water supply boilers were installed to accommodate the domestic hot water needs, and four RBI Futera III heating boilers were installed for building heat.
The four Futera III boilers were each sized for 2 million BTU (2,000 MBH). The designed called for three to operate on an ongoing basis, with the forth boiler as a back-up unit in case of problems.
“We recommended the RBI Futera III series boilers for several reasons,” said Kevin Pickett of Aero Mechanical, the Johnston, R.I.-based contractor hired for the project. “First, they offer a very high efficiency rating of 88%. In addition, we feel that the RBI units are technically superior with respect to the air-fuel mixing system design. The system is also easy to service and offers a compact footprint to conserve valuable space.”
Futera boilers feature full modulation and 3:1 turndown, and are designed to supply the precise amount of heat necessary to maintain desired building temperature by matching heating demand without over-firing and wasting energy. A gasket-free heat exchanger with bronze headers and fittings prevents rust and corrosion for the life of the boiler. Finned tubes are industrial-grade copper with fins and tube walls formed as one for maximum heat transfer.
“The level of coordination by all parties was impressive”, said Peter Sweeney of Sweeney-Rogers, the New England representative for RBI. “Well before the project started a series of meetings was held to assure the synchronization of the boilers and jobsite requirements. Bringing the owner, mechanical engineer, mechanical contractor and boiler rep together before the job starts is always the best way to assure success.”
“We had not used RBI boilers in the past,” said Sprague of the Providence Housing Authority. “The project went very smoothly and everyone did an exceptional job during the installation. In addition, RBI has provided our maintenance staff with training for new equipment. We are very pleased with the boiler performance."
Read the attached .pdf document for more information.