Boiler System Redesigns Can Yield Significant Savings
Replacing an old, inefficient steam boiler plant, pneumatic controls, and air handling units with a new, high efficiency condensing boiler plant with effective DDC temperature control strategies provides school districts with significant reductions in operating costs, and in this example over 40% annually.
Key components for the boiler replacement:
The original design, over 50 years old, was an inefficient steam boiler plant with heat exchangers with constant speed building pumps.
New 93% efficient condensing boilers were installed.
New building pumps with variable speed drives were installed to modulate the boiler plant based on the building’s heating requirements at various locations.
Existing steam piping and hot water heating piping distribution was replaced with new 2- pipe hot water heating/future chilled water piping distribution.
The existing steam heating air handling units were replaced with packaged exterior air handling units with 2-pipe heating/cooling coils and energy recovery heat wheels.
Existing pneumatic temperature controls in 50% of the facility were replaced with new DDC temperature controls. The existing DDC control system in the remaining portion of the facility was merged into the new DDC temperature control system. Temperature control strategies were implemented for the existing and new HVAC systems and boiler plant to provide significant energy savings.
New condensing domestic water heaters were installed to replace the steam to hot water heat exchangers. The old domestic piping distribution was replaced with new domestic piping.
Millies Engineering Group was pleased to be part of this project. These boiler plant and HVAC upgrades have provided the facility with reliable boiler systems, leading to energy savings and comfort for the school for years to come.