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Whitman-Hanson Regional High School Energy Efficient Systems: HVAC

Whitman-Hanson Regional High School Energy Efficient Systems: HVAC. All fans and pumps are VFD controlled with fully reactive controls Condensing gas-fired boilers Condensing DHW One for bathrooms One for kitchen Both located close to the loads to reduce piping and pumping energy

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Whitman-Hanson Regional High School Energy Efficient Systems: HVAC

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  1. Whitman-Hanson Regional High School Energy Efficient Systems: HVAC • All fans and pumps are VFD controlled with fully reactive controls • Condensing gas-fired boilers • Condensing DHW • One for bathrooms • One for kitchen • Both located close to the loads to reduce piping and pumping energy • Building uses less gas than one of the districts existing 8 classroom schools!

  2. Hybrid Chiller Plant • Hybrid chilled water system 200 Ton Evaporative cooled chiller and 200 Ton Air cooled • Carrier Hap Bin analysis showed peak of 419 tons but load for school year is 206 tons • Variable Primary Pumping for CHW & HW circulation • Money saved from not needing additional pumps was allocated to convert from 2 pipe change over to a four pipe system

  3. Mechanical Specialties • Boiler Room moved to reduce piping estimated $212,000 savings • CO2 based DCV controls in all Large Spaces (Green) • Building ventilation is DCV based upon space occupancy (lighting occupancy sensors control VAV boxes setback) • Energy Recovery Unit for Auditorium as well as DCV

  4. Commissioning Design Team Goal: Integrate commissioning throughout the project to assure success in achieving project goals. • Traditional construction commissioning performed by the design engineer: All systems operational • The electric utility’s commissioning agent contract was extended to do functional testing after occupancy and within season for equipment. • Within the warrantee year, found issues with many parts of the mechanical systems • Associated suppliers/ vendors extended warrantee due to commissioning documentation • This was money well spent!

  5. Other unique features • Johnson Medysis Energy Management System (EMS) • School district allowed sole-source bid to allow connection their five other schools currently using the Medysis system • School district has a part time energy manager who assisted in testing and operation of systems • Students do much of the energy analysis • Earth Science students monitor CO2 levels and water collection • Physical science students monitor electric production • Math students graph the data collected from trend logs on EMS and electric production from PV for other students to analyze

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