In the past the nine campus buildings were individually heated by over 15 oil fired boilers.
The new centralized boiler system on the High Mowing campus mainly burns PDCs, Froling Energy’s “precision dry wood chips” which cost about 35% less than wood pellets and burn just as cleanly in the same large biomass boilers. They were the perfect choice for this system which required running buried pipes all across the campus, tying in lots of previously independent heating systems.
For more details download this article on the biomass project at High Mowing School:
Biomass comes to High Mowing School – Article by FROLING ENERGY
High Mowing School, founded in 1942, is the only Waldorf boarding high school in North America.
The new boiler house was designed to fit in among the existing campus buildings.
Froling Energy constructed the new boiler house, installed the entire boiler system and laid all the buried insulated pipes that connected it to the 9 campus buildings.
Fitting into the campus was important to the administration as was having an ultra-clean burning biomass boiler.
The distinctive Main Building and connected wing hold the administrative offices, a large meeting hall, the Dining Room and classroom spaces.
PDCs (Precision Dry Wood Chips) are delivered from Peterborough an average of 1.5 times a week during the winter months
Two Froling TX-150 boilers provide most of the heat and hot water needed on campus.
Each of the fuel storage silos holds 15 tons of PDCs.
Sweeper arms push PDCs into the auger channel in the floor of each silo. Then the augers feed chips directly into the boilers.
A large Belimo ball valve eliminates any chance of a “burn-back” from the boiler into the storage silos.
Chips are metered into each boiler in precise amounts, according to the heat demand.
Each Froling TX-150 boiler has an output of 500,000 BTUs’ per hour but can modulate down to 30% of that. When there is no load, the boilers shut down and then re-ignite when demand resumes.
Use of the 3000 gallon buffer tank is important for keeping the heat distribution loop at 180 degrees F.
The two stacked HTP propane fired boilers act as peaking and back up boilers.